cynic783

My understanding is that when enough alcohol % is detected in the fuel, timing is added, above and beyond the "high" octane table. I believe it runs 4-6 degrees additional timing, depending upon RPM. I do not know the total timing advance. I will need to bring Dave Steck into the convo this is his territory.

82cetuner

iTrader: (9)

I think I could free up some power for sure, btw my setup runs out of power after 6200 or so as well. I have a fast 102/102 setup with speed deinsity and 104 lid so no restrictions. also ported cnc ls3 heads. I wonder if its the ls3 heads themselves holding power back after 6200 to 6300. I have a descent size cam and Im not so sure going bigger will help. it is on a 112 +3 not sure if that takes the rpms down some or not. I would love to see my motor make power to 6700 because it can run 7k all day long

HINSON Motorsports

Great looking and sounding car man. I love these ol Pontiacs, especially the G8s and GTOs. I have a GTO and wouldn't trade it for anything.

CAMSTER

iTrader: (10)

Hey Man good numbers, I know how you feel about your goal however with the cam you have you did great, in my opinion with the heads you have and 11.5 compression on e85 and your intake system (hoping your cold air intake is not restrictive you could do easy 525 whp.

I would have Camhelp@guerragroup.com spec the cam true their software and change push rods to 3/8 by .082 wall.

You would see a big difference mainly from the cam, have the cam spec for 6,800 shift point 7,400 red line.

Youngblood16

Honestly, I believe 82cetuner is on to something. The 250cc runner heads seem a little big for your stock bottem end LS3. Ive seen both Mamo and Tooley 430+ Ci built motors that run no more than 245 runners, and pull 550-600 hp and tq all day. and if its torque you're looking for, aftermarket cathedral ports carry all the torque and its usually a nice flat torque curve.

slowZZZ

Love the G8 GXP, walked past one in the parking lot on my way to work.

I wouldn't get too hung up on hitting the magic 500whp, looks like you're managing great passes without it

Grenade19

Nice numbers

Detoxx03

iTrader: (14)

Assuming this is still a 376 right?

handyandy496

iTrader: (9)

A larger cam will certainly pass your goal. If you have easy access to e85 you could tear up the streets with 13.5:1 compression. Right?

CAMSTER

iTrader: (10)

I like to add that the cat back solo is got to be of some restriction imo.

Exira

iTrader: (1)

6.0 .030 over
l92 heads milled .015
cometic .040 gaskets
btr 226 231
truck intake
ls7 90mm t
flat tops no reliefs
just have open headers on it now
factory air box which is restricting and no underdrive pulley

392 hp 369 tq thru auto trans and transfer case 285 tires stock converter and rear end

ringram

Ok I reckon thats your issue then. Work out the filter area of the VCM and airflow that it supports and you will find your problem if you ask me.

I had similar issue with an over the radiator, took out the filter and 50rwhp turned up. Now running a large rotofab cone..!

Easy to test just dyno with filter out.

C5natie

iTrader: (1)

I have to agree. When i dynoed my cam only LS3 (L92 block and pistons) it did 470/455 and that was with a stock intake, stock LS3 heads, 1 3/4 headers, 10.0cr and 91oct CA gas through a 4L65E. The cam was the 231/236 from Texas Speed.

luisdavid11

iTrader: (2)

my g8 gt, never been dynoed, but i trap the same mph as you at the 1/4 mile. pat g cam stock heads stock intake 2.92 gears and the stock converter with 2.0 60 fts. 12.0 @ 118 so yeah something is up with your car, might want to look into a RCR or Pat G cam. good luck

cynic783

Found an fixed a restriction between the MAF and Cold Air Intake. There was an unnecessary extra coupler partially blocking the MAF screen. Re-tuned and re-dyno'd.

Best of 502/474 SAE

pannetron

Glad you found a simple solution to your airflow problem! It's likely worth re-tuning if the airflow into the MAF was disturbed by the obstruction.

cynic783

Here is the offending restriction.

pannetron

Wow, that's ugly! I'm no expert but from what I do know, tumbling air flow through a MAF will greatly affect the accuracy of its readings. Hopefully your tune was based on a good MAF calibration and removing that restriction got you back to where the tune expected the MAF to be.

cynic783

Had it re-tuned after fixing it. That's where the pickup in power is from.

Pro Stock John

iTrader: (34)

Nice combo.

@ OP, keep working on the drag racing side of things, I'd expect you to run 122-124 MPH now.

My 2010 Camaro with bolt-ons converter and 3.91 gear trapped 115 MPH last year. Unlocked. I just did h/c and expect to go 124 this year.

How much timing can you run on E85? I'm tempted to mess with E85 myself at some point.