Help with sputtering 3sgte, just wanted some opinions as to what it could be Options

[eggman40]

yesterday i was on the freeway with no traffic so i decided to give my car a little exercise. I jumped on the throttle at about 55mph... the car was in Wot and as it accelerated,but then i felt the car stutter for a split second. It almost felt as if i took the car down to about 80% throttle for less then second then back to100. It still reaches full boost at 15psi but just around 8 or 10 psi at WOt is where i feel this....



Anyone know what this could be? Is it the turbo? fuel?bov? any help would be appriated. thank you

[lagos]

you got knock response. lower your boost.

this whole "15psi is ok" that we get from the usdm mr2 guys, doesn't always apply to our swaps because we have jdm ecu's with more timing advance. we have a harder time running that much boost on pump gas.

if you make yourself a tvsv led's, you should be able to see when this happens.

[Insanity-74]

you got knock response. lower your boost.

this whole "15psi is ok" that we get from the usdm mr2 guys, doesn't always apply to our swaps because we have jdm ecu's with more timing advance. we have a harder time running that much boost on pump gas.

if you make yourself a tvsv led's, you should be able to see when this happens.

If you are running JDM ECU`s then i`d agree with this...Japland pump gas is 101ron...you need to be running at least 98 ron to help prevent knock.....or get yourself a UK ECU which should let you run 95ron with no problems what so ever.

[eggman40]

you got knock response. lower your boost.

this whole "15psi is ok" that we get from the usdm mr2 guys, doesn't always apply to our swaps because we have jdm ecu's with more timing advance. we have a harder time running that much boost on pump gas.

if you make yourself a tvsv led's, you should be able to see when this happens.

If you are running JDM ECU`s then i`d agree with this...Japland pump gas is 101ron...you need to be running at least 98 ron to help prevent knock.....or get yourself a UK ECU which should let you run 95ron with no problems what so ever.

shoot... i wish i had 95 here in cali we're only allowed 91... BS! anyway, do you or anyone know if the UK ecu is plug and play? or would it cause problems?





second--- I dont remember right now it i heard air leak like you said Lagos... ill try again tomorrow and see if i hear any kind of air leaking...





3rd--- thanks doc ill look into that and hopefully get one built next week.





Thanks again guys for all the help !

[phattyduck]

shoot... i wish i had 95 here in cali we're only allowed 91... BS! anyway, do you or anyone know if the UK ecu is plug and play? or would it cause problems?

The 91 octane we get here is approximately equivalent to 94 octane in other countries. They use RON, we use (RON + MON)/2. The 98 octane in Japan is more like 94-95 octane rated in the US. Most ECUs can figure it out with the knock sensor, but there may still be a bit of hesitation (my gen 3 motor seemed pretty happy on CA 91 octane gas at stock boost).

-Charlie