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Enthusiast ![]() ![]() ![]() Joined Feb 26, '07 From Boston, MA Currently Offline Reputation: 1 (100%) ![]() |
hey guys...i was just wondering what the stock psi is set at for a ct26...ive heard its at 7, but then ive also read somewhere that its in the 5psi range. does anyone know for sure?
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined Aug 21, '04 From New York City Currently Offline Reputation: 0 (0%) ![]() |
the stock wastegate is set at 7
This post has been edited by shin: Apr 4, 2007 - 10:18 AM -------------------- |
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Enthusiast ![]() ![]() ![]() Joined Feb 26, '07 From Boston, MA Currently Offline Reputation: 1 (100%) ![]() |
thanks alot
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![]() Enthusiast ![]() ![]() ![]() ![]() Joined Aug 9, '06 From Ma Currently Offline Reputation: 1 (100%) ![]() |
On the Celica/MR2 it's ~ 8PSI [sometimes a bit more]. 7 Is actually a bit low.
For the Supra it's ~ 5-6 PSI. -------------------- ![]() |
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined Feb 10, '03 From Connecticut Currently Offline Reputation: 11 (100%) ![]() |
Also depends on your sea level. Mine was 8-8.5.
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined May 12, '06 From Wilmington, NC Currently Offline Reputation: 45 (100%) ![]() |
so, does this mean that if you put a CT-26 on a 5sfte set-up (the turbo will be coming from a mr2 or alltrac) and don't use any kind of boost controller that you'll boost 7-8 PSI?
-------------------- ![]() 94 GT - Sold -------- 69 Pontiac Lemans - Sold 88 Alltrac - Sold ---- 04 WRX - Sold 00 GT-S - Sold ------ 91 Miata - project/drift car 95 GT - Sold -------- 96 GT - New Daily Drive |
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined Feb 10, '03 From Connecticut Currently Offline Reputation: 11 (100%) ![]() |
No. Other variables control boost also, like exhaust for instance.
This post has been edited by Supersprynt: Apr 4, 2007 - 9:26 PM -------------------- |
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Enthusiast ![]() ![]() ![]() ![]() Joined Nov 9, '03 From Dayton, OH Currently Offline Reputation: 2 (100%) ![]() |
Depends... my stock 93 mr2 ran 12psi stock....put a full exhaust on it and it will get up to 16psi in 4th-5th gear
This post has been edited by bufferdan: Apr 5, 2007 - 12:07 PM -------------------- ![]() |
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) ![]() |
QUOTE(bufferdan @ Apr 5, 2007 - 1:06 PM) [snapback]543478[/snapback] Depends... my stock 93 mr2 ran 12psi stock....put a full exhaust on it and it will get up to 16psi in 4th-5th gear ct26 waste gate spring is set to 7psi. on the 3sgte normal boost is around 10psi, because of the factory boost control (tvsv). but if you get a bigger exhaust, youll have a harder time keep the boost that low. -------------------- 15PSI - 30MPG - Megasquirt Tuned
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined May 12, '06 From Wilmington, NC Currently Offline Reputation: 45 (100%) ![]() |
so, if I use a boost controller will I be able to keep my boost lower than just depending on the stock wastegate?
honestly, I wouldn't mind boost 10-11 PSI, I just don't know how much my motor will be able to take and I want to take it as easy as possible on it for the first few weeks. -------------------- ![]() 94 GT - Sold -------- 69 Pontiac Lemans - Sold 88 Alltrac - Sold ---- 04 WRX - Sold 00 GT-S - Sold ------ 91 Miata - project/drift car 95 GT - Sold -------- 96 GT - New Daily Drive |
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Enthusiast ![]() Joined May 10, '06 From Somerset Currently Offline Reputation: 0 (0%) ![]() |
QUOTE(6strngs @ Apr 5, 2007 - 3:39 PM) [snapback]543578[/snapback] so, if I use a boost controller will I be able to keep my boost lower than just depending on the stock wastegate? honestly, I wouldn't mind boost 10-11 PSI, I just don't know how much my motor will be able to take and I want to take it as easy as possible on it for the first few weeks. u cannot lower stock wastegate psi with a mbc. u can only raise it. to lower stock psi you would have to run an external wastegate and that can get pricey. -------------------- ![]() |
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Enthusiast ![]() ![]() ![]() Joined Mar 4, '06 From Ohio Currently Offline Reputation: 10 (100%) ![]() |
QUOTE(6strngs @ Apr 5, 2007 - 3:39 PM) [snapback]543578[/snapback] so, if I use a boost controller will I be able to keep my boost lower than just depending on the stock wastegate? honestly, I wouldn't mind boost 10-11 PSI, I just don't know how much my motor will be able to take and I want to take it as easy as possible on it for the first few weeks. If you got a mbc that works well, You could keep it at 5 psi. Thats very safe for that engine. 5 psi is how high it will boost when cold or when it sences a problem |
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![]() Moderator ![]() ![]() ![]() ![]() ![]() Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) ![]() |
QUOTE(toyotacrazy @ Apr 5, 2007 - 8:44 PM) [snapback]543672[/snapback] QUOTE(6strngs @ Apr 5, 2007 - 3:39 PM) [snapback]543578[/snapback] so, if I use a boost controller will I be able to keep my boost lower than just depending on the stock wastegate? honestly, I wouldn't mind boost 10-11 PSI, I just don't know how much my motor will be able to take and I want to take it as easy as possible on it for the first few weeks. If you got a mbc that works well, You could keep it at 5 psi. Thats very safe for that engine. 5 psi is how high it will boost when cold or when it sences a problem this is NOT true. guys, this is simple. the wastegate on the ct-26 opens @ ~7-8psi. with a free fowing exhaust, it will creep. a boost controller will only allow you to RAISE, not lower boost. -------------------- Former Team 5SFTE pro member ;)
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![]() Enthusiast ![]() ![]() ![]() ![]() Joined Aug 9, '06 From Ma Currently Offline Reputation: 1 (100%) ![]() |
Exactly
And the TVSV can only raise boost from what the WG is set at. It can't lower it. -------------------- ![]() |
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Enthusiast ![]() ![]() ![]() Joined Mar 4, '06 From Ohio Currently Offline Reputation: 10 (100%) ![]() |
QUOTE(alltracman78 @ Apr 5, 2007 - 7:57 PM) [snapback]543676[/snapback] Exactly And the TVSV can only raise boost from what the WG is set at. It can't lower it. sorry, I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi. |
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined May 12, '06 From Wilmington, NC Currently Offline Reputation: 45 (100%) ![]() |
ok. I think I understand now. and I think I can scratch the MBC off the list of things I need for my 5sfte. at least for the time being.
-------------------- ![]() 94 GT - Sold -------- 69 Pontiac Lemans - Sold 88 Alltrac - Sold ---- 04 WRX - Sold 00 GT-S - Sold ------ 91 Miata - project/drift car 95 GT - Sold -------- 96 GT - New Daily Drive |
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![]() Enthusiast ![]() ![]() ![]() ![]() Joined Aug 9, '06 From Ma Currently Offline Reputation: 1 (100%) ![]() |
QUOTE(toyotacrazy @ Apr 5, 2007 - 8:53 PM) [snapback]543703[/snapback] QUOTE(alltracman78 @ Apr 5, 2007 - 7:57 PM) [snapback]543676[/snapback] Exactly And the TVSV can only raise boost from what the WG is set at. It can't lower it. sorry, I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi. If your WG actuator is set for 8 PSI, you can't go below that, period. -------------------- ![]() |
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Enthusiast ![]() ![]() ![]() Joined Mar 4, '06 From Ohio Currently Offline Reputation: 10 (100%) ![]() |
QUOTE(alltracman78 @ Apr 6, 2007 - 12:27 PM) [snapback]543991[/snapback] QUOTE(toyotacrazy @ Apr 5, 2007 - 8:53 PM) [snapback]543703[/snapback] QUOTE(alltracman78 @ Apr 5, 2007 - 7:57 PM) [snapback]543676[/snapback] Exactly And the TVSV can only raise boost from what the WG is set at. It can't lower it. sorry, I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi. If your WG actuator is set for 8 PSI, you can't go below that, period. You CAN boost below 8 psi. when the tvis is activated it wont allow the car to boost past 5 psi. This is called SAFE mode. As ive heard it called. When the engine detects knock or cold temperature of the coolant temp. |
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined Nov 12, '02 From Webster Ma. Currently Offline Reputation: 1 (100%) ![]() |
QUOTE(toyotacrazy @ Apr 6, 2007 - 5:51 PM) [snapback]544097[/snapback] QUOTE(alltracman78 @ Apr 6, 2007 - 12:27 PM) [snapback]543991[/snapback] QUOTE(toyotacrazy @ Apr 5, 2007 - 8:53 PM) [snapback]543703[/snapback] QUOTE(alltracman78 @ Apr 5, 2007 - 7:57 PM) [snapback]543676[/snapback] Exactly And the TVSV can only raise boost from what the WG is set at. It can't lower it. sorry, I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi. If your WG actuator is set for 8 PSI, you can't go below that, period. You CAN boost below 8 psi. when the tvis is activated it wont allow the car to boost past 5 psi. This is called SAFE mode. As ive heard it called. When the engine detects knock or cold temperature of the coolant temp. Your a little confused. its ok though. OK whatever the WG is set to is the lowest possible boost you can run. when "safe mode" activates it turns off the stock boost controller TVSV and you run W/e the WG spring is. when "safe mode" isn't on, normal driving conditions it bleeds off air so the actuator opens later, thus upping boost. i suck at explaining things. -------------------- |
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![]() Moderator ![]() ![]() ![]() ![]() ![]() Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) ![]() |
QUOTE(toyotacrazy @ Apr 6, 2007 - 5:51 PM) [snapback]544097[/snapback] QUOTE(alltracman78 @ Apr 6, 2007 - 12:27 PM) [snapback]543991[/snapback] QUOTE(toyotacrazy @ Apr 5, 2007 - 8:53 PM) [snapback]543703[/snapback] QUOTE(alltracman78 @ Apr 5, 2007 - 7:57 PM) [snapback]543676[/snapback] Exactly And the TVSV can only raise boost from what the WG is set at. It can't lower it. sorry, I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi. If your WG actuator is set for 8 PSI, you can't go below that, period. to reitterate what ive been saying all along, the STOCK WASTEGATE SETTING IS ~7-8PSI You CAN boost below 8 psi. when the tvis is activated it wont allow the car to boost past 5 psi. This is called SAFE mode. As ive heard it called. When the engine detects knock or cold temperature of the coolant temp. trust me, jermey will know how the ct-26 actuator works better than you, hes a toyota tech. lol besides the fact that he has one TATTOOED onto his arm!! you have the right idea, just the wrong numbers. on a 3sgte, in "safe mode" IS 7-8psi. when the TVSV energizes, it goes up to ~10-11.8psi. -------------------- Former Team 5SFTE pro member ;)
![]() 13.6@108MPH, 5SFTE Powered |
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Enthusiast ![]() ![]() ![]() Joined Mar 4, '06 From Ohio Currently Offline Reputation: 10 (100%) ![]() |
sorry posted to wrong topic
![]() This post has been edited by toyotacrazy: Apr 6, 2007 - 6:29 PM |
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![]() Enthusiast ![]() ![]() ![]() Joined Aug 28, '04 From FLA USA Currently Offline Reputation: 4 (100%) ![]() |
QUOTE(presure2 @ Apr 6, 2007 - 6:11 PM) [snapback]544121[/snapback] trust me, jeremy will know how the ct-26 actuator works better than you, hes a toyota tech. lol besides the fact that he has one TATTOOED onto his arm!! And has put so many CT26s on his alltrac than any one I've known. ![]() Joking aside, the T-VSV is actually a bleed valve. It bleeds pressure out of the actuator and let the wastegate open at higher psi. It CANNOT make the car boost lower than the wastegate spring setting. -------------------- _Gary
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![]() Enthusiast ![]() ![]() ![]() ![]() Joined Aug 9, '06 From Ma Currently Offline Reputation: 1 (100%) ![]() |
![]() For a while I was swapping the damn things in my sleep..... QUOTE(x_itchy_b_x @ Apr 6, 2007 - 5:36 PM) [snapback]544109[/snapback] QUOTE(toyotacrazy @ Apr 6, 2007 - 5:51 PM) [snapback]544097[/snapback] QUOTE(alltracman78 @ Apr 6, 2007 - 12:27 PM) [snapback]543991[/snapback] QUOTE(toyotacrazy @ Apr 5, 2007 - 8:53 PM) [snapback]543703[/snapback] QUOTE(alltracman78 @ Apr 5, 2007 - 7:57 PM) [snapback]543676[/snapback] Exactly And the TVSV can only raise boost from what the WG is set at. It can't lower it. sorry, I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi. If your WG actuator is set for 8 PSI, you can't go below that, period. You CAN boost below 8 psi. when the tvis is activated it wont allow the car to boost past 5 psi. This is called SAFE mode. As ive heard it called. When the engine detects knock or cold temperature of the coolant temp. Your a little confused. its ok though. OK whatever the WG is set to is the lowest possible boost you can run. when "safe mode" activates it turns off the stock boost controller TVSV and you run W/e the WG spring is. when "safe mode" isn't on, normal driving conditions it bleeds off air so the actuator opens later, thus upping boost. i suck at explaining things. Actually you explained it perfectly. ![]() Look, here's the deal. I don't know EXACTLY what the WG actuator is set to. It will differer between cars regardless. Elevation, barometric pressure, humidity, age, wear and tear, heat, air temp, and production differences ALL will effect exactly when it opens. And how fast it opens. The BGB states stock pressure is from 8 - 11.8 PSI. Most completely stock ones I've see are right around 8. My 93 Alltrac NEVER ran 5. It was 100% stock [except for a boost gauge], and always topped out at 8 [give or take. Maybe it was 7.5 in actuality, or 8.5]. When I ran the WG vacuum line to the intake manifold it bumped to 10. And stayed there. All the way to 173xxx miles. Adding a larger exhaust, a DP, or an intake will raise the actual boost pressure without you using a BC. So will a better ic. Cold air does this as well. A buddy of mine has a 90 Alltrac. He put a full Aussie 3" exhaust, a ARC TMIC, and an intake. He was hitting fuel cut without a BC. He was rather unhappy with that. ![]() Don't worry exactly what it's supposed to be. As long as you are 8 - 12 stock you are fine. 12 won't blow your engine either. Assuming everything is good of course. I had my 92 @ 14 for a long time [some 92/93 ECUs are set to ~14PSI fuel cut]. Part of it on a Supra CT26. Never had problems. Stock ATA TMIC. -------------------- ![]() |
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Enthusiast ![]() ![]() ![]() Joined Mar 4, '06 From Ohio Currently Offline Reputation: 10 (100%) ![]() |
My wastegate must not be operating correctly. B/C during safe mode Im only hitting 5 psi. After it warms up Im only hitting 8-9. I see what you guys are telling me about the W/G being set at a specific boost and you cant go lower than that.
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![]() Moderator ![]() ![]() ![]() ![]() ![]() Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) ![]() |
are you swapped with a stock exhaust?
if not, you have a problem somewhere, or your boost gauge is off. ![]() -------------------- Former Team 5SFTE pro member ;)
![]() 13.6@108MPH, 5SFTE Powered |
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Enthusiast ![]() ![]() Joined May 30, '05 From MN Currently Offline Reputation: 8 (100%) ![]() |
QUOTE(presure2 @ Apr 7, 2007 - 5:31 AM) [snapback]544232[/snapback] are you swapped with a stock exhaust? if not, you have a problem somewhere, or your boost gauge is off. ![]() X2 stock exhaust did that to me right after swap, I was not able to boost past 8.5psi. Once replaced, I have been able to boost up to 11psi all stock. -------------------- 3sgteing.
..burns twice as bright, lasts half as long. "The weight of the world is love. Under the burden of solitude, under the burden of dissatisfaction." -Allen Ginsberg- |
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![]() Enthusiast ![]() ![]() ![]() ![]() Joined Aug 9, '06 From Ma Currently Offline Reputation: 1 (100%) ![]() |
Don't forget, massively retarded timing, such as with a bad knock sensor, will lower boost as well.
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Enthusiast ![]() ![]() ![]() Joined Mar 4, '06 From Ohio Currently Offline Reputation: 10 (100%) ![]() |
QUOTE(alltracman78 @ Apr 8, 2007 - 4:15 PM) [snapback]544548[/snapback] Don't forget, massively retarded timing, such as with a bad knock sensor, will lower boost as well. I thought the exhaust was slowing me down. I have a turbo xs dump pipe. Then I have about a 2.25" flex pipe. The rest is stock GT. I unbolted everything except the flex pipe. I still only boost between 8-9 max. If I put washers in between my wastegate actuator and the turbo, I can boost all the way to fuel cut (14 PSI). I wonder if my wastegate actuator is worn out. ????? Also, Ive noticed on the few nice 70* F days we had, my tvis monitor leds detected a problem. Then I could only boost to 5 psi. When I cycled the key, it went back to normal. |
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![]() Enthusiast ![]() ![]() ![]() ![]() ![]() Joined Oct 5, '03 From South TX. Currently Offline Reputation: 14 (100%) ![]() |
hmmmm, so much inconsistency, I just got a MBC because i got tired of 6psi(thats with 3in intake, Full exaust). Just yesterday i finally raised it to 9-10, pulls amazing, but i want to extract the most power possible.
My motor can more than handle it, it was rebuilt, with headwork and an 88MM bore(old was 87MM), the question is how much can I add with the stock engine management(ecu-fuel), and if I want more power what is something good to add? *I'd like to add that the rotating assembly is fully balanced This post has been edited by 95celgt: Apr 20, 2007 - 1:38 PM |
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![]() Enthusiast ![]() ![]() ![]() Joined Aug 28, '04 From FLA USA Currently Offline Reputation: 4 (100%) ![]() |
QUOTE(95celgt @ Apr 20, 2007 - 1:37 PM) [snapback]548854[/snapback] hmmmm, so much inconsistency, I just got a MBC because i got tired of 6psi(thats with 3in intake, Full exaust). Just yesterday i finally raised it to 9-10, pulls amazing, but i want to extract the most power possible. Manny, Jeremy and I probably have more than 20 years combined experience with CT26 and 3sgte. Stock CT26 wastegate setting is 7 psi and with right condition and T-VSV fully functional, it will reach 10-11 psi without a boost controller. If you don't believe that, here is what Toyota manual says ![]() and my stock boost gauge reads 10 psi on a 92*F day http://www.youtube.com/watch?v=REoG0k_LVjs QUOTE(95celgt @ Apr 20, 2007 - 1:37 PM) [snapback]548854[/snapback] My motor can more than handle it, it was rebuilt, with headwork and an 88MM bore(old was 87MM), the question is how much can I add with the stock engine management(ecu-fuel), and if I want more power what is something good to add? *I'd like to add that the rotating assembly is fully balanced You won't go very far with stock turbo and ECU. Boosting more than 15 psi on a stock CT26 is pushing the limit. You should consider a bigger/better turbo and other support mods (fuel, intercooling, exhaust, etc..) Depending on your goal, there are different routes to do this. 300 whp or less, CT27/CT20B, reflashed ECU, 550cc inj, etc... 300-400 whp, TD06, T3/T4, SB kit, stand alone EMS, etc.. This post has been edited by Gary: Apr 20, 2007 - 2:01 PM -------------------- _Gary
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![]() Enthusiast ![]() ![]() Joined Jan 23, '05 From Malta Currently Offline Reputation: 2 (100%) ![]() |
Mine is 10psi stock not boosted, this is because of the bigger free flow exhaust and TVSV removal. 10 PSI is the MAX I got and the reding was on the ECU not boost gauge so it is presice, I couldnt get more pressure 10psi was MAX (stock) hehe
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