Right now I've been running 14 PSI sometimes it spikes to 15

I was initially running 10 during the break in period



and It runs flawless! except for a slipping clutch



How Much boost can I turn it up untill I will need to upgrade the fuel system...



read my Spec's and tell me:

____________________________



87 TII

S4 Block large Street Port

FD Upper Intake Manifold and Throttle Body

greddy Elbow

2.5" Turbo IC Piping

3" Intake Side IC piping

HKS Race Bypass Valve

NPR Large FMIC

modified secondary fuel rail with custom fittings and -8 line to the primary rail

Stock Metal undercar fuel rails

Walbro 255 Hi_pressure FP running on its own Relay

SX FPR set at 40 Static

1680cc secondary injectors and 850cc primarys



Turbo- Turbonetics T-66 .81 A.R P trim

tubular Manifold

Turbonetics RaceGate



Also I have yet to Dyno My car (need to replace the clutch)

What's your estimate I'm putting down at the wheels?



Should I add another walbro pump with a seperate relay and -8 lines under the car and -6 return

and have the second pump only come online when I hit a preset boost level



Or replace the Walbro with a Supra Pump



Goal is 425-450 RWHP

 

It kind of depends on how your motor was built , was it with 3mm seals or back to stock 2mm seals? Thats how i would limit how much boost to run, With 2mm seals I would take it to 18-19Psi Tops for me that is with your current setup, 3mm I would take it to 25Psi.



IF you normally run 10-15 psi, I think you should be getting about 350rwhp, with more tuning and crank the boost up to 25psi its possible you can reach your goal.

 

Also , I like your setup and was curious if you post some pics of your car and especially under the hood !! Because im looking to get my bro a turbo 2 and he could see some ideas for his setup.

 

Oh sorry I never answered your question, I think you could take it to 19-20Psi before upgrading.

 

COOL Thanks



I get some Pics tommarow

 

setup should be good for 30psi regardless of seals

 

yah stock 2mm seals hold LOTS of boost... some of the guys making huge HP use the stock 2mm seals.

 

what about a 85 12A how much boost do you think it can withstand safely i am planning on boost 10 psi with a to4b

 

Just got back from track



12.60@111.87

running 14PSI and a slipping clutch