alright i've been tossing arround the idea to get some psi going to take the edge off gas milage and give a booster shot in the power area and i was wondering whats a safe boost rating for a stock W VG motor?

i am headed out to the junkyard this weekend and i am gonna grab a turbo brick turbine since they dont push much more than 10psi but i can always adjust a little aswell

 

10psi is pretty much the max you could run non-intercooled with some timing taken out and a bump in fuel pressure, but that's pushing it usually. Some guys with the z31 have been able to run 12psi non-intercooled with no issues, some can't run more than 8psi without detonation. It'll all depend but 8-10psi seems the normal limit.

 

ok heres the deal i was running 8 psi on hicompression pistons, with no intercooler and turbo injectors- ennnt didnt work when the car gets hot ratatatatatatttat, detonation. i intercooled it and bumped feul pressure up to 45 psi and retarded timing to like 12 now im fine i get an injector click from time to time but other than that its fine, dont non intercool a hi comp vg without some sort of tuning, timing or feul pressure or both...

 

I say 14 psi with fuel pump/injectors/fpr and tune.

Yes I'm crazy...I did a VQ to 13.

Hey E...your injectors are suppose to tick...it means they are firing.

S

 

uhh yea my injectors tick. i am supprised 10psi is more than i wanted to push so i guess i'll be good. the tricky parts gonna be the manifold i guess

 

Just get a set of 300ZX turbo injectors, Fuel Pump, ECU, T3 Turbo, and T3 Manifold, then you can do what I did on mine, and make a relocation pipe with T3 flanges on both ends. Once I get mine fabbed up and tested I can probably make you one. You could top mount a turbo with the relocation pipe, if it's small enough. the Z31T T3 seems to fit good, or an FC RX-7 IHI T3 Turbo would fit too, and be just the right size to give 8 psi, and small enough to spool really quickly.

It would be a good idea to get a small intercooler and make a top mount setup, but in order to do that you'd have to relocate the battery to the back, and put on a 300ZX-T hood scoop to get air on the IC, like Big_E-dog's old setup.

If you wanta push it to 12 psi, you could go with a cheap water/methanol injection system for about $150, which basically supercools the intake air. It should efficently cool down the intake air, and allow you to boost higher without detonation.

But if you really wanta boost it good, you'd have to find an 87.5 300ZX turbo ECU, and buy a Romulator to tune the chip, or run a good 9:1 boosted VG rom that someone made, you can find them on the Z forums, alot of Z31's run boosted 9:1 engines. It is really important to make sure you have the right mods to the ECU and fuel system to boost a 9:1 VG,

i believe i have 5 good Z31T injectors... you could have them, but you'd have to find the 6th one.

Good Luck on the boosting!

 

no boosting now check out the other thread. i am gonna find something a little more worth while.