well ive got part throttle looking real good now with the tbi setup. I have been running 20 psi with the stock injectors. Driveability and torque has inproved by leaps and bounds over the carburetor.


WOT has been giving me problems though, runs great up till about 4500 rpm then everything goes to hell. Basically, I am static at 20 psi and the ve% i have in the table probably around 5200 rpm, maybe sooner

Ive even increased the pressure to 50 psi and its still not enough.


Bigger injectors here i come.

 

have you verified the PW at 50psi? and have you verified 50psi at the high RPMs? tripleing the FP should give you TONS of injector

 

No and No

but

according to the latest data i have seen concerning the VE table relative to BPW and a few other inputs I am easily exceeding pw's that would make me static, especially at high rpm with a bpw of 112 and ve% of 90% +

The wideband says 13.9:1

as for FP, i am using a pump rated for 42 psi and I have verified its flow capability before albeit awhile back by running a gauge up to the window while i drove

50 psi is actually not that much injector when using the stock injectors. According to the 40 lb/hr flow rate ive seen quoted at 13 psi 50 lbs of injector only gets me 78 lbs of fuel. Granted i think TBI injectors flow more than is claimed but its still not near enough to support 330 hp especially at high rpm.

I suppose I over estimated what I thought was a sandbagged injector flow number.

 

what i wonder now is whether or not running static can actually cause a lean condition somehow that would otherwise wouldnt be lean if the injector were not static

 

yes it will, static means it is flowing all it can flow, it so you run out fuel, if you had a larger injector, the commanded pulse width would be less, because it would pass more fuel while the injector is open.

 

what i meant was had the injector not been static would it somehow flow more, Ive read some about injectors getting erratic at static, I wonder how true that is and if its enough to cause the injector to actually flow less

 

Can you lower the BPW further than what you have it at? You said 112 which would equate to about 65pph injectors. With all that pressure you're at, like you said, 78# or maybe more if the injectors are underrated.

 

yeah i could but it wouldnt matter, I would stil lbe static unless of course I lowered the bpw enough that i was unable to make them static even at 100% ve, i imagine that would be around a bpw of 70 something

 

Yeah, I see what you mean. Well what injectors do you think you're going to go with? Big block ones?

 

gonna have to, you know of a good source for em?

 

Nah, sorry, the best I can say is find somebody selling a TBI on ebay that doesn't know what they have. I found a guy selling a cop car tbi on ebay and didn't know it was anything special and I got it for like 15 bucks I think.