How much boost on Pump gas?

[richy rich]

Im running 94 octane w a more or less stock GN.36lb inj,hot wired 255lph pump,cold air,no cat,perf exh,160 therm,165-170 running temp,all sensor's %100.Turbo Tweak Street chip.Im safe at like 12lbs,but as I approach 15lbs its getting 3-4 deg knock,& I can hear it rattle a slight bit.My Motor has been apart before,so its possible the block & or heads were cut down.So what do ya guys run on the street for boost?

 

[Turbo1dr]

Run as much boost as you can without any knock. That will be how much boost you can run with pump gas.

I run up to 10psi on 87 octane and upwards of 30 on 116.

 

[Lee Thompson]

Largely

Depends on how much timing.

 

[BlackBandit]

And how well your heads/intake flow and what kind of turbo/intercooler setup you have.

 

[87we410877]

I run 20 all day no problems on 93. Lots of timing no alky no knock . I dont know how, but it does. Goes real low 11's on just pump.

 

[ijames]

I run 20 all day no problems on 93. Lots of timing no alky no knock . I dont know how, but it does. Goes real low 11's on just pump.

Your sig says you have a 70 turbo and rjc front mount - that's how. Do you really just have 36 lb/hr injectors? You need way more fuel to match your airflow.

With a stock turbo and stock intercooler and 94 octane and 18-20 deg of timing at wot, somewhere around 13-15 psi it going to be the limit for seeing zero knock retard and zero esc counts on a scan tool. If you can hear knock you are getting at least about 15 deg of retard which is way, way too much. Always tune for zero knock - you might get .1 quicker at the track with 1-3 deg of knock retard for a couple of seconds during a 1/4 mile pass but I like to be as safe as possible and letting it knock more than that usually slows you down.

 

[turbo1962]

I ran 16 on 91 without any knock,on Turbo Tweak chip at stock setting.

 

[cuda6pak]

I run 16psi on 93octane with my TT chip +10% WOT. 17psi and I start to see knock.

 

[Boost231]

ive run 20psi on 92 octane and no knock when my car was stock. it was tuned very well and it was a cold night.

 

[richy rich]

Ya well,maybe 13ish is all im good for.I pulled a couple deg timing out in first-second gear,& kept high gear as is,I tried pulling timing out in high gear,car would nose over-so I put it back.