After finally getting the motor where I wanted it I forked up the cash and got a genuine dyno tune. I don't know if I should be disappointed with these numbers or not so your opinions would be GREATLY appreciated...

SAE Corrected #'s: 380.7 RWHP/444.7 Torque

Peak HP was made at 6100 RPM and remained at around 374rwhp until shifting at 6600RPM. Peak torque was made at 3700rpm and steadily declined as rpm increased.

Mods:
396 (All forged internals)
Ported Heads
CC306 Cam
Jet Hot Longtubes/No cat/Borla with no plate
CAI
58mm TB
Port Matched Intake
Electric Waterpump
4l60E with Vigilante 3200 Stall (Flashes more like 3400)
Heavy duty Steel driveshaft
Moser 12-bolt with 3.73's

Engine ran great and the tuner could not identify any shortcomings or choke points. Is my drivetrain really absorbing that much horsepower? I know that A4's make their money at the track and not the dyno but does anyone think I should be higher with a stout 396? Thanks!

 

what kind of heads?? what are the port shapes and what do they flow???

my guestimate is that that is your weak point

 

thats not too bad for a cc306... a slightly larger cam in a 396 would definitly give you some more power. But i bet it has great driveability...

 

What he said...I agree, heads sound like the weakpoint.

 

Could you post the graph?
Run the car at the track! That the best test.

 

Sounds about right.....IMO there's no point in going with the stroker if you don't have the heads to feed it.

 

your torque is great, your HP is not......my heads and cam LT1 with an untouched short block dyno'd 380 RWHP.....

 

Well the heads are a "full race port" by MTI in Texas before they stopped doing LT1's and focused exclusively on LS1's. They usually make some pretty good stuff and are pricey, so I hope they're not the weak point. As for flow numbers, I don't have the paperwork anymore.
I would post the dyno graph if I could but I can't post attachments and I don't have anywhere to hang it.
As for driveabilty, I really can't complain. It drives pretty well...

 

What,s your A/F ratio. Did the tuner play with it and the timing? Was the pull in third gear? Why are we talking about #'s and then shifting?

 

A/F ratio is 13 to 13.5 across the board (4400 to 6200). The tuner worked extensively with the timing and A/F (according to him). I belive the pull was from 3rd as all the tables start at 3600rpm. As for talking about shifting...I dunno, I was trying to give some context to the numbers although I probably did not achieve that.

 

well i just went through the same (weak 396) problem its the cam that cc306 is no good for us you need to contact a cam builder to have one made. my guess is your dynamic compression ratio is off and causing you to loose alot of power mine was and i have 13.8:1 compression. ditch that cam mti did good heads just as good as loyd elliot so i doubt they are the problem flow numbers would be best to have but 99.9% i have faith its that cam

contact mindgame, 1racerdude, sstroker ace or just look in advanced tech for them

 

I was just wondering if you got your moneys worth. It wasn't to clear in your initial post. I know that dyno tunes are not cheap. One more question, what kind of exhaust set-up are you running behind the long-tubes?

 

Exhaust is Jet Hot Longtubes into a Hooker Y-pipe into a Borla with no plate.

 

Call Jeff Creech at Carolina Auto Masters. He just finished building and tuning an LT1 383 that put down 445rwhp/439rwtq with a 190cc Ai CNC ported head. Jeff knows a few things about these cars.

www.carolinaautomasters.com

 

I dunno, i put down the same HP with a hotcam and current mods... See sig.