car bogs while on throttle

[97gsxwi]

i got a 97 gsx, it has an intake, big 16g evo 3 turbo, fmic and apexi full exhaust, greddy type s bov....when driving normally it boosts fine, but when the gauge shows like 3/4 boost it cuts hard while on throttle, even if easing on the throttle. one the turbo hits like 3/4 boost the car cuts hard . did a boost leak test and fixed all the leaks, still have the problem tho. any ideas? should be running stock boost, w.e that is exactly ...any ideas of what to do next? i'm thinking maybe its fuel cut?

 

[Rogi]

You should get an aftermarket boost gauge, its hard to tell with the stock one. Are you running stock 450cc injectors? Same

 

[97gsxwi]

yes stock pump and injectors

 

[97gsxwi]

just fuel pump? not injectors? i'm thinkin wally 255

 

[dsmdream]

You need to get a aftermarket boost gauge the stock gauge tells you nothing. Stock boost is 12psi. When you hit boost does it feel like your hitting a brick wall then its taking off again?

 

[97gsxwi]

yes it cuts hard then spools up fast again...

 

[CJ89]

looks like everyone beat me to the punch i was going to say fuel problems.. i just ran in2 the same issue

 

[97gsxwi]

so should i just do fuel pump? or injectors and pump?

 

[96talontso]

Im having the same exact problem with the same exact mods except the turbo, should i just do a walbro 190?

 

[Rogi]

you are knocking really crazy, you shouldnt drive it as hard until you upgrade the injectors and pump, i had a valve blowed up because my car was doing the same thing and i didnt know what it was, aftermarket boost gauge for sure, so you'll know whats going on

 

[hollyskittles]

ok so how can you run stock boost on an aftermarket turbo?serious question btw not being a douche you are probably running way more boost than you think everything ive read says fuel cut is usually around 15 psi (usualy) on a stock fuel system feel free to correct me im not the smartest when it comes to these cars


and whether you need both pump and injectors will depend on how much boost you are actually running i found a boost gauge on the internet for like 20 something bucks a few months back i would link it but i cant seem to find it any more anyways a cheap boost gauge is better than the stock one/nothing

 

[Calan]

so should i just do fuel pump? or injectors and pump?

You should put down the wrenches (and checkbook/credit card), and do some reading.

Start here:

Top 10 Most Popular DSM Q & A's
Frequently Answered DSM Questions
Tech Guide: 2G 4G63t Upgrades

 

[97gsxwi]

yea i'm getting a boost gauge and wally 255 pump soon. i guess we will se what happens after that

a couple of my friends with gsx's said that i can just get an safc and i'll be good with stock injectors...that somewhat true??

 

[97gsxwi]

anyone know of good tuning places in the Wisconsin area?