When does a T3/T4 60 trim work?, is it normal that it is at 4K revs? Options

[Conwa]

I recently installed a T3/T4 60 trim turbo on my 7afe, but is it normal that it start boosting at 4K revs?
I have a B16 manifold and a 2,5 inch downpipe.
It spools up @ about 3,5K but kicks in at 4K and stops at 6200 when it hits the rev limiter (of course)
Its running @ 0.45 Bar (7psi ?)

[playr158]

super 60 will puke on the top end if your running anything above 10psi.

good spool, so its fun to drive.

i highly doubt it would really....a lot of VW 1.8Ts use them and very successfully at that...
a 7afte isn't going to out flow the T3s60......plain and simple the T3/T4 in my research of the turbos for the 7afe are just too big...not to mention real world results....you want to get full boost by 3,000-3,200 any later and your really just moving out of the power band of the motor.
like i said a SMALL SMALL t3/t4 would work much better 40/47 trim a 60 trim t3/t4 is TOO LARGE, period.
we were using a t3/t4 50 trim on an EVO making 400+ whp getting full boost @ 4k-4,500rpm...

[angrymike]

super 60 will puke on the top end if your running anything above 10psi.

good spool, so its fun to drive.

i highly doubt it would really....a lot of VW 1.8Ts use them and very successfully at that...
a 7afte isn't going to out flow the T3s60......plain and simple the T3/T4 in my research of the turbos for the 7afe are just too big...not to mention real world results....you want to get full boost by 3,000-3,200 any later and your really just moving out of the power band of the motor.
like i said a SMALL SMALL t3/t4 would work much better 40/47 trim a 60 trim t3/t4 is TOO LARGE, period.
we were using a t3/t4 50 trim on an EVO making 400+ whp getting full boost @ 4k-4,500rpm...

vw 1.8ts don't make good power numbers without a bunch of help. not a good example for this senario.

does your research include real world experience? i've been in a number of cars with 1.8L~2.0L engines that die on top with super 60's. most people that buy super 60's change them out 6 months later for a t3/t4 or larger.

if you want full boost by 3000 rpm, you have never driven anything with over 200whp to the front wheels. my old daily driver didn't reach full boost until 5k. it was great, i was able to keep traction and actually race from off the line. i was making 340whp on a 1.9L with a t3/t67.

your are right about a smaller t3/t4 working better, however the 60 trim will work fine as well. it is not too large. at the 6500 rpm a 1.8L will be in the highest efficency range, which is why it feels good up top.

you don't typically want to size a turbo that at the end of the run you are in the 60% efficency range, which is where you would be with a super 60.

t3/t4 flow numbers:

50 trim = 48 lbs/min
57 trim = 50 lbs/min
60 trim = 52 lbs/min

the difference in spool between a 50 trim and 60 trim is about 500 rpm. its has a worse compressor map then a 50 trim which makes it perform a little worse at lower rpms.

not trying to be a dick. i delt with the "super 60 problem" for about 4 years now with all the saturn guys. people that usually buy them are very disipointed when they push more then 10psi.

This post has been edited by angrymike: Apr 25, 2007 - 8:12 PM