Performance Limits

[Clipz0801]

Im Just getting my Gst finaly tuned after my upgrades are installed, and i just want to know what are my limits, as for safe driving, and a place were i should wath... ie high boosting. My mods are:

550cc Venom Injectors
250lb Walbro
Evo III Big 16g
GT Turbo Headers
Megan 2.5-3' Downpipe
Greddy Evo II Exhaust(No Cat)
ACT 2600 Clutch
Fidanzo Lightweight Flywheel
MAF-Translator
APEXi SAFC II
Dejon FMIC
Dejon Blow thru Set-up
HKS SSQV
Stock Tranny
Stock Head
58k miles with valvetap
1998

They said they are going to run the boost to about 18 psi... and i want to know the limits and such before i take her out and test her . Thanks guys.

 

[taylork057]

18psi is 2 much for 550s without a FPR, i proved that on dsmlink. but maybe not with your 16g, mine was a much larger turbo.
my guess is 320whp ish.. idk its hard to tell

 

[Loewen21]

1)If you're running a 255 walbro you will need an aftermarket fpr for sure.
2) Tuned properly that set up could get you somewhere around 350wph with about 21psi
3) You may not be able to run 21 without pushin the 550s to their limits, not exactly sure of their capacities. look for slightly lower numbers with 18 pounds

 

[kenamond]

If your evo3b16g creeps, you might be running 20+psi boost rather than 18psi whether your tuner shop wants to or not. If your 550s can handle it, though, that's a good thing, right?

 

[Clipz0801]

FPR isnt that big of a thing to install is it? And will my stock tranny hold up with all this power, along with the stock block? And how bad is valve tap in our cars.

 

[roni-wan]

You are gonna need the FPR i think 18 psi is good for those 550 but you maight need logger to be safer

 

[koho2731]

1)If you're running a 255 walbro you will need an aftermarket fpr for sure.

Ok this is misinformation. You don't NEED a FPR it is very helpful, but you don't NEED one. Yes you will over run the stock FPR and you'll have to pull more fuel out due to higher pressure and it'll idle a bit funny, but you don't NEED a FPR. There are a ton of people running Walbro 255/ Supra TT fuel pumps with out FPR and have no problems.

 

[pmanaresi]

you will probably be able to get 300whp on 18lbs of boost. Dont worry about your tranny and block, they can handle that unless you start to get crankwalk. Valvetap is very common, dont worry.