Boost Issues

[awd95mn]

I installed 3" exhaust on my 2g, treimche's old stuff, and now I cannot control the boost at all. I have an SLS mbc, and it worked prior to the exhaust. It always boosts to a little over 15 now and that is enough to hit fuel cut. I am on all stock fuel, have a 1g bov, and uicp. I checked for boost leaks and I fixed all of them still no luck. Have any ideas? Would this cold weather affect the a/f mixture that much to lean it out so bad?

[TsiTom]

There are a couple things you could do... #1 Get an external wastegate...#2 Get a bigger o2 housing (atmospheric dump would probably be best)...#3 Get the turbine inlet and path to the WG ported...this will make airflow to the wastegate easier...

[Guest]

do you have the stock t-25....if so them turbo's are all screwed up....they like to peak at like 18-20 then dsrop back down to 14-15 psi

[btleier]

ahhhh..... gotta love boost creep.

[Jim]

Buy an AFC, get a fuel pump and just use that extra boost to go faster...

15? Shit... where's the 25psi?

[awd95mn]

the old t-25 would be dead @ 25 psi, but I am thinking, just go for a fuel pump and see if that helps

[Guest]

if you get a fuel pump then you will need a afc.

[Jim]

190lph he wouldnt

[Phats]

Jim wrote:
190lph he wouldnt
amen, i had the 190, and the only reason i needed the afc was the turbo and 6 something injectors.

[Guest]

but if he's gonna end up modding his car more he might as well just get a 255 and a afc

[PSI2HI]

3" downpipe is gonna make trying to run low boost impossible on that internal wastegate.

[24valvenotak]

oh well. afc, injectors, 20lbs?.. now you have no excuse for not breaking into the 14's

[awd95mn]

92BlackTT wrote:
oh well. afc, injectors, 20lbs?.. now you have no excuse for not breaking into the 14's

well I hope I can get there pretty much where I sit, but I am pretty sure I will need a pump to not hit the damn fuel cut