Finally made it up to Carolina Auto Masters yesterday after months. I managed to put down some okay numbers. I was expecting more but I wasn't expecting to be running out of fuel. Injector duty cycle was at 125% just to get this :

519hp/491tq

Started going lean after 4600 rpm even with 50 lbs injectors and an adj FPR set at 55 psi. So now I have to either get a meth kit or get an impedance conveter for some real injectors. I'm pretty stoked though and ready for some timeslips

 

Whats your setup?

Nice #'s

 

383 with LE3 LT4 heads and intake, 224/236 .608/.628, P-1sc and all bolt- ons through a 9 inch with 4.11s and a 6 speed.

I was surprised to see over 8 psi on a 10 psi pulley with this setup. I think I peaked out at 8.5

 

I thought the 50's would be better for a little more HP than that.

 

they were great up until 4600 or so . After that the march of death began and when he let out of it, it was at about 14:1 or so I think.

 

What fuel pump(s) are you running?

 

50's should do more than that.

Sounds like you where running out of pressure honestly.

 

yeah, I have 50's and made 540hp and I was still safe on the A/F. I am runnning the stocker with a T-rex and 43psi.

 

Ive got a racetronix pnp pump with a boost referenced adj FPR set at 55 psi static

 

is it a autmatic with a big stall?

 

I just happen to have a lowZ injector driver and 83lb injectors for sale..
email me!

 

no sir, 6 speed and a 9 inch with 4.11s

 

Something is going on then.. You shoudl have watch the fuel pressure.. haveing a good or new pump really doesn't say anything. You can still have problems

Case and point.. i just literally got of the dyno 2 hours ago with a PTK turbo LS1. Has a brand new walburo 255 hi pressure pump and 60 lbs motron injectors. At 4500 RPM it was flying way lean and fuel pressure was dropping from 58psi (ls1) to 30psi.


I've made over 550 pretty darn easy with 50's in a straight drive car.

 

Ill have to check my fuel pressure on a wot blast and see what I come up with

 

Jeff should have had a fuel pressure gauge there. I guess he didn't care enough to put it on the car. Typical