SCannon

Heres a list of what is in my 01 C5 Coupe...

-LS2 Block w/ ARP main studs.
-Lunati Non-Twist 4.000" Stroke Crankshaft
-Callies Compstar 6.125" Forged 4340 Rods.
-Diamond Forged Pistons 4.000"
-Comp Cam 242/250, 112 .600 Lift
-Morel Lifters
-Rollmaster Double Roller LS2 Chain.
-AFR 225 Heads CNC'd w/ Hollowstem valves, Upgraded Springs, 65cc chambers. Flow 316/238 at .600 lift
-ARP LS2 Head Bolts.
-Cometic Head Gaskets .051
-Hardened Race Bearings.
-Heavily Ported LS6 Oil Pump and Shimmed Up for Max Pressure.
-FAST 90mm Intake (Ported by Tony Mamo)
-LS2 TB (Also done by Tony Mamo)
-MSD Wires
-Vararam Air Intake
-Stainless Works 1-7/8 Headers w/ 3" X-Pipe
-McLeod Street Twin Clutch
-McLeod Aluminum Flywheel
-RPM T-56 Transmission
-3.90 Differential w/ all internal goodies
- 60# Motrons

Dyno was done on Drag Radials and they only did a few pulls on it. It was on a Dynojet, it started getting late and they said the car was too loud they didnt want to do any more pulls until tomorrow. Engine was built by SLED28

515 RWHP 480 RWTQ
520 RWHP 484 RWTQ
They also said they havent had any detonation at all and there is still more tuning to do to pull out a few more. The car has been down for 5 months and it has old gas in it. They are going to let me put a few miles on it, get fresh gas, and try to find a good fuel pump for it.

undertaker

sweet man, that thing is just begging for some juice

pdd000

sounds like a killer setup

FunCool

That's extraordinary from a 402ci I know 427ci that can't make that power.

SCannon

Im having Drivability Issues, under 2000 RPM is stumbles and isnt smooth. Riding out the clutch is hard, wants to stall. Anyone have any advice for tuning? I am running 60# motron Injectors and stock fuel system. I have someone that will trade me plus $ for Motorsports Green Tops.

SCannon

Here is a picture of the dyno

http://www.hotrodz.org/vette/files/dyno/

tlaselva

Very nice power out of that 402. Congrats to you and Sled28 for building such a stout motor!


The problems your having sounds like it's all in the tune.
May be best to wait until you have a fresh tank of gas before you tune it aggressively.

Sent you a pm.

SLED28

Very glad to hear buddy!

You might want to try swapping out the motrons, I've heard they have had drip problems.. Is it chugging like its fat when its under 2000rpm's?

SLED28

SCannon

Under 2000 Rpm it feels like its missing cylinders. I cannot cruise under 2000 RPM in 1st or 2nd gear, it jerks me really hard. Id say the engine is surging really bad.

eb02z06

The 60's can be made to work-I'm using them on a 346 with just a blower but when I'm not in boost it runs just fine. Just sounds like an issue with the tune-have hooked up a wideband to see what's happening. That's some killer #'s though! Dave does some nice work!

SLED28

Thanks EB02Z06!

SCannons, can you get the shop to email me the HP tuner file of your car? Maybe we can have a look from here and make some changes down low. Email it to sled28@look.ca

Thanks!
Dave

cyclerage23

Try dropping a couple degrees of timing just to see how it affects things.

DSCHULTZ

thats a big cam i have some problems with my car idling and surging and my cam is a 232 240.bigger the cam harder to get it to idle.

SLED28

Here's one of the dyno sheets... WHat do you guys think of the curve?

eb02z06

Dave I need the stock file too. Looking at the modded file it looks like too much timing in the low rpm regions and not enough up top.

SLED28

Thanks Arun. Its a 01 C5 coupe, you don't happen to have one of those in your laptop by any chance?
I sent a email for the stock program though and when I get it, I'll forward it to you.

SCannon

The car didnt have a stock tune in it. It was tuned for a lingenfelter heads/cam package

LeMansBlue04

My guess is that your tune is not yet where it needs to be. I also believe you have way too much injector. You should be just fine with a 42# set. I have SVO 30's (they flow about 35 Lbs/Hr on our cars) and I get 470/461 out of an A4 with 205 heads. (Your flywheel numbers and mine would be within 15 HP of each other.) Most people use the 42# injectors with a 402 if they are running NA. The 60 Lb. injectors just make it harder for your tuner to get an idle you can live with.

After a further tune the 60's may work but if you still have idle problems after that I would go to 42's. You might also want to consider drilling the TB, but only as a last resort.

SCannon

Is there a way to transfer a HP Tuner file to a Tuner Cat file? I have tuner cat with the LS1 Definition file. I have 42# Motorsport Green tops sitting here that I might try. If someone knew what parameters needed to be entered for the 42's I could use my tunercat to change it and install them myself.