Anyone have any ideas why I would only dyno 369RWHP/372RWTQ, with JPR S2 Heads, TR 227/224 cam, and other mods in sig. I just am kinda disappointed. Esp. when I have friends that are dynoing like 20-40 more with similar mods, or even stock heads I thought I'd have seen 400RWHP.

 

Low hp is usually a result of a restrictive intake or exhaust. Do you have a ls6 intake? what about a lid?

 

Do you know if your air/fuel ratio was good? What about timing?
I'd take it to the track and see what kind of mph it'll run.

 

im in the same boat as u. 386rwhp

 

Whats your air / fuel ? I dont see an asp pulley , thats good for a few rwhp across the graph .

Post your sheet

 

Dude, use dyno for tuning if necessary, but by all means don't rely on the #'s. Take it to the track and see your best trap. That will tell you how much Hps to the ground.

 

have you had it tuned yet? tuning does WONDERS.

 

Yeah, I got my dyno numbers from the dyno tune. I can't see my exhaut as restrictive, with PPC LT's, 3 1/2-3" Y-pipe, and a cutout. I do have the LS-1 intake still as do others I know, but have an SLP lid. This is the reason I went with a reverse split cam, I am adding the ASP pulley next week. A/F was around 12.8, and I peaked HP at 6400 and it began to drop off. Maybe my heads aren't as good as I expected. I heard good stuff from JPR, but I'm just not seeing it. Yeah, the track will tell. Before I installed the heads, cam and headers, I was running 13.4's here in Las Vegas on motor and 12.7's on the 100 shot. If I can't run 12.7's all motor now, this will show me somehing is just not right!

 

Hey Scott

Can you post your dyno sheet?

 

well you loosing a good bit of power on the dyno with three main things. decent size converter, gears and automatic tranny. id say anywhere from 15-40 hp. depends on a few things, mainly the average power loss on a 3000 converter.
hasnt anyone told you dyno numbers on a auto mean nothing once you start changing those things. they are always going to be way low. i lost like 15 hp with my 12 bolt and 4.10 but picked up almost half second with nittos

 

I didn't get a print out of my dyno, . I have been reviewing my tune on LS-1 edit and my high octane timing is stock, but the tuner added a lot to the low. and did a lotof fuel work, which I really needed. A friend went on after i with S2 heads, a 230/232 cam, Long tubes, in an auto with a converter and gears and pulled 400 RWHP. I just cant see that much diff. Another auto frien pulled 355RWHP with an auto, converter, 3.73's, and stock heads. I must have a step child motor

 

Even with the tuning did you plug in an autotap or scanner to see if you were getting any knock retard? Also the ls6 intake will be worth a few ponies and the asp will be some more. Also I would think that increased timing would give you even more hp so maybe they can work the tune a little more. The other thing that I would try is to call Joe and ask him what your flow #'s were.

 

I was gonna ask if you thought your cam was off a tooth, but seeing that your power is peaking at 6400, I now doubt that's the case. You never know, but it could be off. One tooth will easily suck up that much power. Just a thought.

 

What's your altitude there in Las Vegas? I'm here next to you in Utah where the altitude is 4500 feet; that gives us a 15% power loss compared to sea level.

 

Hey pdd I read somewhere where those twin flow filter create so much turbulance it actually restrics air to the intake.

 

Our altitude is 2000ft. I am 100% sure my cam is dead on. Thanks for the thoughts though. On the dyno, there was no KR during the runs, on the street I occasionally see some, but due to it being occasional I feel it to be false. I just thought for sure there would have been 25-30 more RWHP at my wheels. Oh well. What cells are mostly WOT, where I could add a degree or two and see how it does?

 

Do the Headers have Cats in them?My FLP cats lost 25hp.
Just a thought.

 

My JPR's work good with a smaller cam! Something else is wrong ..

 

What kind of dyno was it on? What tires? Rims? Those are keys in dyno numbers too, which as far as I'm concerned don't mean a thing. My 95 only put down 403 according to the dyno but I was trapping what you see in the sig at 2200' DA in a full weight car. That's a lot more than 403rwhp.

 

Oh, and don't mess with the WOT timing would be my guess. If the tuner set it up right, you'll see more harm than good out of 2 degrees more timing. 2 degrees is only like 4-5 rwhp, maybe. But knock will take away more than that.