I just got a joe p mbc, and I plan on moving the boost from the Tial default setting of 6.5 lbs. to 8. I have the fuel system the DRAG III came with: the Vortec FMU with the 12:1 disk. The turbo is a T3/T04B on an LS engine by the way. I plan on changing to a better system this summer, but in the meantime I was wondering if 8 is too much to expect out the fuel setup I have now.

 

I would just keep it at 7psi. I'm sure it won't hurt that much if you climb to 8psi once in awhile. But Tomakit on this board had a cracked sleeve and he was just boosting at 6.5 psi. When you upgrade your fuel system and tune it, then 8psi will be a breeze.

 

I wouldn't run more then the 6psi that you are until you get larger injectors.

 

darn, not the responses i was hoping for....anyone else wanna comment?

 

You can run 8psi with your setup. However, when you do make sure you add some race gas just to make sure.

 

I ran 9psi this summer about 7000 miles, then 11psi for past couple months, then 14psi on race gas at the track(14psi by accident). Now I run 9-10 psi tuned with Hondata. See link.

https://honda-tech.com/zerothread?id=342007

 

well i meant the question to be about is it safe to run 8 psi with stock injectors and an FMU, which is my current setup.

 

sure it's pretty safe. but stuff can happen, and it won't leave much room for error. On my old gsr, dragIII kit, 8 psi, boost spike - byebye rings.

 

I ran stock injectors, had the fuel pressure REAL high, 14deg of timing. Never one hint of detonation, without a tune, before Hondata. I run a manual boost controller, no spikes yet. Like everyone says, anything can happen. You have low compression, the amount of boost pressure is fine, just if you have any detonation on stock internals you could have a problem. Thing is, if your running 6lbs and have the same detonation, your in the same boat anyway.

Now that I have Hondata, I can say....what a difference. Drives like a totally different car. Never realized it was actually running a little rough, out of boost. Now the transition to boost is seamless, car is sick smooth-except at idle from the RC 440 injectors. $$$ well spent FMU=
You can get Hondata installed with some injectors for probably just over $1000?. Do it soon.

 

That's asking alot from stock injectors and just an FMU 12:1...

If you can afford to rebuild... do it .... if not, play it safe and run at the same boost level for now. But hook up the MBC anyways, it may decrease your spool time/lag.

X2

 

FMU + stock injectors + spiked to 9psi + stock motor = Cracked ringland in 8 spots

oooh, a whole night of boosting too...I mean A WHOLE NIGHT NON STOP




[Modified by Flamenco-T, 2:27 AM 11/25/2002]

 

i would not run over 5psi with stock injectors no matter what fmu you are running.

 

Well, ok, guys you've convinced me. Since I want this relatively new car to last me a while longer, I'll set the boost at 7 lbs. I'm looking at the SMC zip is selling along with some DSM injectors to replace my FMU setup I have now. Any problems you guys can see with running 8 or 9 psi with the SMC/DSM's?

 

 

to the top

 

Stock motor 9psi went KABOOM! It may have spiked alittle it was a cold night on a wonderful Deltagate. But you can blow your motor on 5psi and bad tuning or a stuck injector, some people go forever on stock motor and stock injectors others blow up within a weekend, I've known many people with those circumstances. Standalone is the only way truely.