I just got the car back after getting the following installed: AFR 205's 66cc, Dynatech Lt's with high flow cats and y-pipe, GMMG Exhaust, custom cam 228/228 112lsa, Sphon SFC, timing chain, oil pump,TR55's, moly pushrods, SLP CAI, all new gaskets...car was tuned and then dynoed on a dynojet 335.4HP / 362.5lbs. Car is not a daily driver...has 11k on it, 2001 Z28 A4 2.73. I was rather disappointed with these numbers anyone have any input on whether or not you think the numbers are low or would could be the problem...I was expecting alot more...maybe too much???

 

#'s do seem a little low, still running stock intake/TB and injectors?

 

What kind of converter? Locked or unlocked?

 

ported TB and stock injectors, stock intake

 

stock converter...deciding on which one to go with...everything else on the car is pretty much stock

 

Stock chambered AFR's aren't making impressive dyno numbers. Should've milled 'em!

 

Wow 66ccs? Yucky DCR

 

It osunds like it's got a pretty conservative tune in it. I would expect higher than that with afr's and a decent cam. The stock intake is killing you, as are the stock injectors. The tuner may have seen that he was bringing up the injector duty cycle to a point where they're just working too hard and backed off a little.

With a different intake and injectors there's more power to be found in that combo for sure. It's too bad you didn't mill the heads before they went on cause you're losing some power right there.

Did you make a baseline run before the tune or before the heads/cam isntall? It would be interesting to see how much tune netted you hp wise...I really do think it's a conservative tune...You can get cars with bolt-ons only to put down those numbers.

 

I didn't do a baseline run because i was trying to save some $$ and to be honest i didn't expect to get #'s that low where it was going to bother me this much, to know how much i really gained

 

What if he has to deal with 91 octane California cruddy gas?
Would milling them have made them not suitable for poor gasoline?

 

It depends how much they would be milled. But I don't think it would be much of an issue...With aluminum heads you can usually get away with up to 11.5:1 compression on pump gas. I haven't done the math but I doubt the compression would be that high. 11:1 at the most...After that it's all in the tune. If the tuner keeps the a/f's safe and doesn't try t crank the timing up too high, I don't see a problem.

LS1's have knock retard so if it did start to knock due to a bad tank of gas the computer should compensate.

 

Well your stock hp at wheels was probably 270-280 with a auto so 335 isnt that bad. but you are a little low for those mods. I dont think your tune is right on. A stall would help a lot, maybe find some used injectors on this site for cheap. I would also call a sponser and tell them what you have and did and see what they have to say and maybe they can help. The same thing happened to me I only gained 30rwhp after head cam intake and injector swap, come to find out my exhaust gaskets were blocking the ports a little.

 

thanks for the suggestions...i don't feel so bad now

 

1999 camaro - A4
STOCK
295hp/305tq

pinging (bad gas & fouled plugs)
on a 4wd dynojet
isnt so bad after all???

 

a larger stall speed wouldn't help his numbers at all...especially if it was unlocked during the dyno run.

what gear was the car in during dyno sessions? what rpm did you take it to? i've read a lot of threads where 273 geared cars couldn't run out 3rd gear all the way or had to make a pull in 2nd gear just to reach the rev limiter, ultimately skewing the numbers.

confirm your a/f is good then take it to the track and see what it runs. dynos mean nothing, the tuner could've simply put in the wrong correction factors or something...who knows.

bottom line: GET A TIMESLIP.

 

I'm running standard AFR 205's (not milled), with a tad smaller cam than you, TR224/114. My rwhp after its dynotune is at 431 (mustang dyno). Granted I have a 383 block, but that mostly plays into higher torque numbers, not so much the HP.

Something is definetly holding your power down some. Maybe the tune, but like others have just mentioned, bigger intake/TB, and injectors.

 

See that's the number people tend to expect with heads cam cars. That was on a mustang dyno too...Probably closer to 450-460 on a dynojet.

 

If you're running stock AFR's then you should be around stock compression for an LS1. This also depends on what headgasket you used, Which one did you use? Hopefully you have more in the tune. You can see in my sig I run similar parts as you but your cam is bigger. Did you ever calculate your DCR with your set up?