Jc803

iTrader: (2)

Engine was built probably 3 years ago and have put probably 20-25k miles on it since with no problems. It dynoed at 511hp 2 years ago so dynoed it again yesterday. New numbers are 515hp and 490tq but it was still pulling till it hit my rev limiter that I have set real low because at the track I shift just before that. I shift very early to prolong engine life. Didnt have my hp tuners on me to bump it up to see where peak power is unfortunately. Check the chart to see what I'm talking about. Also A/F ratios were real rich at 11.7:1. I think leaning it out a good amount and spinning the engine higher I could see a lot more power.

Dyno was on a dynojet. Number are corrected. Pulled in 4th gear. Feel free to follow my build thread in my sig.

1999 Trans Am WS6, T56, Moser 9", 28" tires, AFR225 heads, Scorpion 1.7 RRs, 11:1 comp ratio, eagle rotating assembly, Edelbrock Pro Flo XT intake, Nick Williams 90mm TB, 4" aluminum air intake with 7" velocity stack, Kooks 1 7/8" headers, Kooks 3" to 3.5" Y pipe, 3.5" pipe to 5" straight through muffler to 3.5" turn down before axle, 42# injectors, deleted power steering and AC compressor, done on 91 Octane, street tuned myself in custom 1 Bar SD OS with HP Tuners

Here is the video

1989GTA

Heck yes you still have more power. I would take it up to around 6500 rpm. Nice numbers.

HCI2000SS

iTrader: (2)

Oh wow yes spin that thing a little higher lol

SoFla01SSLookinstok

Sweet T/A! Revving over 6k I bet north of 550hp.

What cam is in that baby?

Jc803

iTrader: (2)

Its a Crane cam. Instead of typing everything here is a picture

1989GTA

That is a fair size camshaft. It needs to be spun higher to take advantage of it.

(SS)

iTrader: (1)

Let her wind up.You got way more in it.Heres one of my old dyno sheets for you to compare.

Jc803

iTrader: (2)

Yea I need to spin it higher for sure. But like I said I wish I had my hp tuners on me. But I went in there only wanting 500hp and I got it. It made 511 years ago but I wanted to see how wear and tear of about 20k miles would effect it. Maybe next time I'll find the peak

ranmas2004

iTrader: (1)

They don't have 92 Octane where you are? Spinning that badboy higher like 6500rpms with that healthy of a cam you leaving a good amount of power on the table. Also a 11.5:1 CR would bring out more power. Can't wait to build my 408!!

What block did you use to do the 408 on? LQ block? LS2, LS3?

Jc803

iTrader: (2)

It's a LQ block. And no unfortunately 91 is premium here. But I'm about to get out the army and move back to SC where they have 93 at every pump

Jc803

iTrader: (2)

But 93 and a higher compression ratio won't matter either way because after I move in starting a 80 or 88mm turbo build with e85

SIC GTO

Idk why the hell some places in Tx only have 91 octane and most of Tx has 93...

formulaon18s

Ok question. If you are racing someone or just letting her rip on the highway do you shift at 5700rpm? I'm really curious why you would even spend money to get on the dyno and not even rev to the redline of a stock motor.

Jc803

iTrader: (2)

Well first off I would never ever spend money for a dyno. I only care about track times, and I do all the tuning myself on the street. So I've never had the desire to know the numbers. I only went because this was a competition and I knew that's easy money in my pocket knowing how slow the cars around here are.

But no I don't shift that early. I normally shift around 6,200 or so. I set the rev limit lower because everyone in this city seems to be mentally challenged and I knew even if I told the guy doing the dyno pull to stop at the shift light, he would keep going.

Example. My ignition, accessories, starter and everything are on a switch panel. I told the guy with precise detail what switches to turn on and leave on, then hit the starter switch and after it starts immediately turn it off or the starter will continue to run (because it's not a momentary push button switch). Then I explained the whole thing again. He says he's got it. Next thing I know he does the first pull and it sounds weird, lets off and coasting down and I still hear something. Walk up to it and sure enough he just made a 5k+ rpm pull with the starter on the whole time.

And that my friend, is why I set the rpm limit so low