Boost level Vs Injector size

[blown88coupe]

Ok, just trying to figure out what combos people are running. I was running 39lb non cooled with a 3.33 pulley on my vortech Draw through stock MAF,this setup gave me 13psi and ran very nice. I have swtiched to a front mount, blow through with PMAS Maf and 80lb on a 3" pulley. I cant seem to keep consistant A/F. Looking to see what people are running, and also max PSI for 39lb injectors.

 

[Greg Hazlett]

I have been told that 1 lb of boost= 1 psi of injector; so if base pressure is 39 lbs and you are running 13 lbs of boost 42 lb injectors are needed....but...don't skimp on fuel components, you can run rich and not really hurt anything, run lean and....well......anyway....

If you have 80's you should be good....sounds like a tune issue either with the MAF or the wrong 80 lb injector data may be in the tune.

How is your fuel pressure-what pumps are you using and do you have a BAP?

 

[stkjock]

How is your fuel pressure-what pumps are you using and do you have a BAP?

/\ very important


also how much power is the car making? 13psi on a non-cooled kit? any meth or other cooling?

boost and fuel injector are not directly correlated from my understanding, boost is a measure of restriction, not power output. Fuel demands are more directly related to power, more fuel + more air = more power, so that's more of a factor.

As to injectors, the flow can be manipulated with fuel pressure, for instance a 39# injector can be made to flow like a 47#(iirc) by raising pressures about 10 psi. Easily accomplished with a GT500 dual pump set up. I had a HO Vortech kit on my 06 - made 460 whp on a Mustang Dyno, GT500 pumps and 39# injectors.

 

[blown88coupe]

I am running a single 400lph pump with BAP and wire upgrade.

/\ very important


also how much power is the car making? 13psi on a non-cooled kit? any meth or other cooling?

boost and fuel injector are not directly correlated from my understanding, boost is a measure of restriction, not power output. Fuel demands are more directly related to power, more fuel + more air = more power, so that's more of a factor.

As to injectors, the flow can be manipulated with fuel pressure, for instance a 39# injector can be made to flow like a 47#(iirc) by raising pressures about 10 psi. Easily accomplished with a GT500 dual pump set up. I had a HO Vortech kit on my 06 - made 460 whp on a Mustang Dyno, GT500 pumps and 39# injectors.

I understand what your saying. Also Greg I think you are right about the tune. Whats weird is that if i park in the garage at night I only get a lean/stumble for a couple min after start up. But parking outside it seems to e doing it alot longer. Think I am just going to bite the bullit and take it somewhere to tune. Right now i am useing pro racer.

 

[retfr8flyr]

Contact lito and do some data logs. If you have the racers package he can just tell you the changes to make instead of going through the e-mail tune thing.


Earl