The Sad

iTrader: (8)

Got the car back together from the winter project and dynotuned it over the weekend.

Power mods:
Tsunami cam
PRC stage 1 LS6 heads - .040 head gaskets
Pacesetter headers, 3" ORY, 3" cutout
LS6 intake and underdrive pulley
4000 stall (dyno number reducing mod)

Put down 415hp/363ftlbs

(We are not sure why it has some backward squigglyness at the top? I'm thinking it was the software, didn't seem to do it until we changed the color to print)

Abdullah

iTrader: (2)

seems a little low for me. i remember the PRC stage 1 LS6 heads before they made close to 480rwhp before years with full mods. i don't know why they are not doing that now? try throwing a ported Fast 102mm LSXR cathedral intake, you will gain close to 25-30rwhp.

firefighter813x

iTrader: (6)

That does seem low too. What brand converter?

Squirts11

iTrader: (14)

For that size cam, you should be putting up better numbers, even with the stall. Also, is it just me, or does the torque seems extremely low for a such a big head/cam car?

triche

iTrader: (4)

Agreed...something isnt right....

JohnnyBz28

iTrader: (12)

Those seem like low numbers for that cam, but could that be because the intake isn't allowing it to breathe as much as it needs?

I have the PRC Stage 1 LS6 heads, LS6 intake and a 225/229 .580/.590 114+4 LSA cam and put down 409rwhp 392rwtq on a dynojet....

The Sad

iTrader: (8)

My power before with PRC Stage 2.5 5.3l heads with 2.04 intake valve, B1 cam (221/221) and no underdrive was 360hp so I thought this was a good improvement. I have a Fuddle converter - I believe it was locked during the runs (it slipped out the first time for some reason, but I think we got it to lock. I'm waiting to hear back from my tuner).

Could it be the dyno? We had a lot of issues trying to get it to allow a full run. The tach signal keep cutting out, keep throwing an error about the brakes being too cold or something.

How would I start diagnosing this?

Thanks,
Aaron

JohnnyBz28

iTrader: (12)

It could be yeah. It could also be location.........I'm in NY and when I dyno'd it was 60 degrees and cool with no humidity.

The Sad

iTrader: (8)

I'm in UT. DA at the time was almost 5900 ft. Uncorrected hp was 359.

I did look at a few other threads and I think you guys are right - I am low. How much is the stall eating up?
This did over 450 with very similar mods except stage 2.5 LS6 heads and no auto:
https://ls1tech.com/forums/dynamomet...o-results.html

SLOC5LS6

Did you flycutt? How were you able to fit a 235/240 .654"/.609", 111 LSA Cam in there with .040 head gaskets.

The Alchemist

iTrader: (19)

That is pretty suspect, especially the low torque number. I put up ~400ft/lbs of torque back in 2002 with hand port 853 heads and a tr224 cam in a 6speed with 3.73 gears.

The red line was when I was cam only with a 212/216 cam, and the blue line is replacing the heads and stepping up to a tr224 cam. This was with macs and a crappy 2.5" ypipe as well.

The Sad

iTrader: (8)

I confirmed that the converter was locked during the runs.

Maybe my car just dyno's low with mods (360 before) and/or the dyno is off?

No fly cutting needed - the setup fits. I couldn't fit a big enough cam with my other heads so I swapped to this setup.

Squirts11

iTrader: (14)

I'm surprised TSP hasn't responded here, as these numbers don't seem to represent their products in the best light...

KingSS

iTrader: (1)

Unless im reading this wrong, but you went from 360 with heads and cam then changed to a different set of heads and cam and dynoed at 415? Thats a 55rwhp pickup, IMO thats pretty freakin good comparing the two. Maybe the dynos are low or your car just dynos low but I think thats a pretty awesome pick up considering the parts being replaced were already aftermarket. Were both of these numbers coming from the same dyno?

KingSS

iTrader: (1)

Also, take that thing out to a track and run it! We all know auto's are not dyno queens, and you can see that the car is making power by how it runs. Let us know what happens.

Longshot LCMS

iTrader: (1)

x2... Autos suck for dyno numbers, it's the track where the rip it up. I've seen some very nasty LS1 cars only dyno 390whp but still run 11.40 on the motor.

Squirts11

iTrader: (14)

^^I can agree with these past several comments, I suppose the very low tq is what really surprised me.

ramairroughneck

iTrader: (35)

What a tough crowd. I dont think the numbers are bad. And who knows, you might dyno 15 horsepower higher somewhere else and suddenly everyone will be telling you right on.

Longshot LCMS

iTrader: (1)

He said the converter was locked... cars with the converter locked on the dyno will put up higher HP but lower torque... with it unlocked the HP will be lower but the torque will climb up quite a bit. It's just the nature of an auto.

Yep... dynojet or not, numbers mean dick if it's making the right MPH at the track.

SAPS

my vette put down 391 unlocked with PRC LS6 heads and 224 cam...3000 stall and 3.42's

i dont get too caught up in the numbers...it runs strong

http://www.youtube.com/watch?v=XNtz4...eature=channel

Generally autos are not dyno queens...beyond that I think there a some over generous and stingy dynos out there.