gts500

this run is for a friend of mine and he have simillar mods like i do such as G5X3 and patriot ls6 smal intake runer. but he only made 400 hp and i made 422 hp ? and his run on the TORQUE side looks werd ? is that ok or somthing wrong with the tuning of the car ??? and someone told me the number are low because of the use of stock GM head gasket .51 ,so if he swap to .040 would that pump more hp? pls help

file attached.

KONG

iTrader: (4)

Is his car an automatic? Kind of looks like it from the tq curve. there are a lot of variables that can cause a car with similar mods not to dyno the same as yours. Weather being a BIG factor. Tuning also. Do you guys have the same tuner? If you do and your set up is similar, have your tuner load your tune into your buddies car and go from there. Going to a .040 headgasket is a good idea because it improves quench and it bumps compression a little. But he shouldn't expect to see a 22hp gain though. Gains will be minmal but it will be worth the effort to install them.

allngn_c5

iTrader: (3)

I have to disagree a bit with you kong. I just had .040 cometic gaskets installed to replace a failed set of gm mls .54 and my compression jumped to 11.4+ to 1 and the torque went up quite a bit. Hp jumped up around 13 rwhp and torque went up 23 at the wheels. Then the cam swap and ported intake / tb were added plus a zo6 MAF to get me to the rest of my power that I picked up on my last trip to LGM. The compression is what is going to help you make TORQUE. Aim for 11.4 to 1 or even 11.8 to 1 no higher or you will need better then 93 octane fuel. Good luck. You'll get her figured out.

gts500

will we have 95 octane as standred here and yes both cars are A4 without stalls and the same tuner but with diffrent tune.

allngn what do you think of purchase of cometic .030 ??? because i think we are around 10.7 . so i think the .030 will pump up compression more plus i have fly cutting and he doesnt, will it work well? .

allngn_c5

iTrader: (3)

With the flycutting you lost a bit of compression. .030 cometics would definately raise compression a good bit. Be sure to check for clearance. Don't want pistons and valves going clang clang boom

I hope it works out for ya. Just check and double check clearance. Good luck.

gts500

hmmm,,, ok thnx BTW how about the torque graph does it look normal ?????

allngn_c5

iTrader: (3)

Your torque curve sure does jump up rapidly and then fall off just as quick. Not sure why that is. The curve should be a lot flatter. The Hp curve is awesome !! Hits peak numbers around 6000 and carries them all the way to the rev limiter.....

My only guess about the torque falling off like that would be air flow (lack of), especially on the exhaust side, but then how do you explain the perfect HP curve. You should give your tuner a call. He's better suited to answer.

SideStep

.030!!!

Assuming you are approx. .005 to .008 out of the hole (standard for LSXs), that puts your quench into the low .020s!!! Hope nothing hits on a high rev...

edcmat-l1

iTrader: (10)

The numbers may be worse than you think. tHe CF is set to standard, STD. Set to SAE they will probably be lower.
Hate to be the prophet of doom.
Torque looks crazy. HP doesnt line up with it. Usually with a jump up in torque like that, there is a corresponding rise in HP. The HP line looks too smooth for the jump in torque.
One more thing. Have you tuner print another graph using forced scaling and SAE. That will give a better indication, and will also line up the tq and hp lines accordingly. Making em cross at 5252.

edcmat-l1

iTrader: (10)

I was thinking that too......
I would never go less than a .040 on a stock motor anyways.

Stang's Bane

iTrader: (22)

Nevermind, I R stoopid

Carry on

allngn_c5

iTrader: (3)

Glad you posted that. That is why I said check and recheck. .030 is very tight. Too tight.

vettenuts

iTrader: (4)

Check one thing before you pull it all apart. What intake are you running and what is your friend running? I see you have the Dart 205's. I measured the intake port and found it to be very narrow, so if you have different intake manifolds that may be playing a role here.

gts500

would the .030 make piston to valve clang clang boom ??

but the heads only 62cc plus the piston fly cut, after all this would it hit the motor?

gts500

[.
One more thing. Have you tuner print another graph using forced scaling and SAE. That will give a better indication, and will also line up the tq and hp lines accordingly. Making em cross at 5252.[/QUOTE]

nop he doesnt ,and i wonder why he didnt scale with SAE . i should give a call

Stang's Bane

iTrader: (22)

it is not the piston to valve you need to worry about. It is the pistons makeing contact with the heads. That is even worse

gts500

understandable but so you think with my mod will the .030 gasket cause of piston contact???

i saw few guys here run the .030 without anyproblem and some of them even milled thear heads?

so what is my choise now should i use it or not ? i have it already .

KONG

iTrader: (4)

Remember your heads are milled also. The gentlemen who wrote the thread didn't give details about his combo. I'm not sure what cc his combustion chambers are and whether he has deeper valve reliefs in his pistons. But your gains are very impressive from just a gasket swap.

gts500

thnx for the add < my combustion chamber is 62cc with stock dick hight,plus i have valve reliefs in the pistons.

SPLATT

iTrader: (1)

stock dick height eh? I would stick with .040. But thats just me, I think you should Be absolutely sure about the valves though before you use an .030.