1994Z28Lt1

iTrader: (1)

Well i just got back from the dyno and with the mods in my sig and at a 15.5 AFR i put down 281rwhp and 314 rwt

During one of the runs i had a fuel pressure gauge installed and at idle with vacuum it showed 38 psi and with no vacuum it showed 46 PSI

As soon as i started the run, the fuel pressure never even made it to 46 psi, it gradually went down during the run and ended up at 22 psi at redline

Time for a fuel pump, im hoping to be over 300 with proper fuel pressure and no doubt less timing being pulled due to running lean. Any estimates?

RamAir95TA

iTrader: (2)

I wouldn't be going WOT any more until you get that fuel pressure issue resolved. That is dangerously lean and can cause some serious damage. Nice numbers regardless, but definitely take care of that fuel pump.

lt1-xjs

I would'nt expect anymore power with only longtubes. With more fuel it may go down.
I see you netted 11 rwhp with the addition of longtubes.

speed_demon24

iTrader: (6)

It still amazes me that people do full dyno pulls or run their car at the the track with it so lean.

1994Z28Lt1

iTrader: (1)

Yeah it certainly is risky business

I hadn't a clue it was running so lean until i got it to the dyno, it was still making decent power for a LT1 with minor bolt-ons so no red flags were thrown up til i saw my AFR's

trilkb

iTrader: (4)

it says you did 270/314 with stock exhaust intake and tune. who did your tune? whoever did it they are probably the ones to blame for your 15.5 AFR. Id be writing an email to them yesterday, unless you tuned it yourself. Kinda makes you wonder how long youve been running lean.....

joshh123

iTrader: (1)

lol. i picked up 10rwhp after fixing a bad fuel pump. but the dyno operator made me stop after the first pull was showing lean.. that was 10 years ago on my stock lt4 vette though.

1994Z28Lt1

iTrader: (1)

Madz28 did the tune, but im not pointing any fingers until i get a fuel pump in it, and can maintain proper fuel pressure throughout the run

LSWHO

iTrader: (1)

No, the fuel pressure is to blame for the lean condition.

270/314 is totally believable with his minimal mods in an m6.