erickprouty

I put on TSP PRC Stage 1.0 LS6 CNC Ported Heads and only gained 10 WRHP
WTF !?!? I know here is more HP but where ?
I have233in 239ex 595 605 lift cam,Slp LT,LM1,S2TB,3600 stall, LS6 intake,SLP CAI, On 1998 Trans Am WS6
HELP!!!

01ssreda4

iTrader: (96)

I'm assuming you did a retune?

orangeapeel

iTrader: (18)

That was what I was going to ask as well. What cam do you have? Telling us its a .600 lift cam means nothing.

Sales2@Texas-speed

iTrader: (5)

Need more specs on that camshaft to start. And I agree, if you haven't already retuned, do so. Do you have a before/after graph from the same dyno and same/similar weather conditions?

erickprouty

Yes I have a HP tune and Cam is 233 in-239 ex @112. sep
Me and my tuner don't know why we got only 10 rwhp ??!

01ssreda4

iTrader: (96)

I think they are asking for the specific cam specs. (all specs including what lobes its cut on and where it came from) Also, details about your first dyno, and details about your second or after dyno. My questions-->>>And how experienced is the tuner? All other mods done to the car. Help us help you.

itsslow98

iTrader: (18)

isnt the 233/239 cam a TSP cam?

Maybe its the tune thats hurting you or id check to make sure all your plugs/wires are good and connected.

SSpdDmon

iTrader: (10)

I'd set AFR's so they read 12.7:1 @ WOT and start @ 25* of timing flat @ WOT from 2800rpm on up to redline. Use that as a safe baseline pull (watch for KR). Add in 2* and do another pull (watch for KR). If more power was made and no KR, add in 2* more and do another pull (watch for KR). I wouldn't go past 30* of timing. You'll see where the sweet spot is when it stops making power - don't just keep adding until you see KR. My bet is you'll find best numbers around 28*. If you see KR, it'll most likely appear between 4500~5500rpm.

bjamick

iTrader: (31)

Ouch I'm saddened to see this, I was just looking at the PRC ls6 heads. Wondering if these heads were kinda just passed on thru and never went into the cnc machine? Bc a stock 243 head usually gains 10-15rwhp over stock.

Sales2@Texas-speed

iTrader: (5)

That's an impossibility. Something else is wrong with the combo causing the low numbers.

erickprouty

I think timing is 32* ???

Sales2@Texas-speed

iTrader: (5)

OP: Did you have any luck getting us a dyno graph for before/after? Any chance they locked the stall for the before and dyno'd it unlocked for the after?

garygnu

did you use a new timing set ? was the cam degreed and installed correctly?a locked or unlocked converter would affect your results greatly.

SSpdDmon

iTrader: (10)

KR = Knock retard - the PCM will pull timing if the knock sensors detect detonation in the motor.

Timing might be too high causing you to lose power. Just because a motor can take extra timing doesn't mean you should run that much. I'd be curious to see the numbers around 27 or 28 degrees of timing.

erickprouty

No Dyno graph for before/after and stall was locked up

erickprouty

The motor shows no Knock retard .

erickprouty

I have before but no after !!
here is the before !

SSpdDmon

iTrader: (10)

OK - but my point still remains. It may make more power if you dial back the timing a bit. It is possible to go too far with timing and start losing power.

vettenuts

iTrader: (4)

Was the new curve SAE as well or STD? Is the weather input on the dyno working correctly? There are a lot of other variables to sort out.

SOMbitch

iTrader: (8)

The weird thing about that graph is torque and hp don't cross at 5250.......