killerwhale

i need help i wanna see if anyone knows if my pistons are the reason im dynoing so low i have a lq9 6.0l it has forged diamond racing pistons 8cc dish 4.0600 bore with nitrous rings stock crank ls6 ported oil pump forged rods of course double roller timimg chain and the cam is a ms4 cam heads are just mildly ported only 853 heads i also have a 90/90 combo 3800nitrous stall tci 3:73s long tube hooker headers 38# injectors and im only dynoing at 360 BUT @7500RPM MAYBE ITS THE TUNE???to the wheels


i was thinking its either the pistons or the heads????
i know dish piston are low compression pistons but it helps i got a sheet with pistons saying my compression ratio should be around 10.05 is that too low?????


let me know if u know something THANKS!

crainholio

iTrader: (2)

It must have been tough typing all that with one hand...

180ls1

iTrader: (4)

hahaha


how does the engine sound, have you done a leakdown test? Is there anything abnormal about it?

You might be blowing through the converter or the transmission might be going.

killerwhale

lol.... man i just dont know wtf is wrong im gonna try getting bigger heads

180ls1

iTrader: (4)

was that run unlocked and what dyno type? Do you have a dyno sheet that you can post?

You need to see whats wrong first because your car should be making more power then that even with a small cam on a stock ls1.

killerwhale

engine sounds like its gonna do some serious damage really sounds great just didnt like my dyno numbers but of course it has a weird tune well i think it does

killerwhale

really appreciate the help but yea i have my dyno sheets ill post it later today and it was tuned with hp tuners on dyno but them dyno numbers on my sheet show it dynod that at 7500 rpm i think thats too high

redz_02

iTrader: (4)

Might look into the heads. Never tried 853 cast heads on any of the 6.0L variants. Aren't those built for a 3.9 inch bore? That could have some effect. As for tuning, we can't really tell unless you post the dyno.

Also why type of dyno was it?

180ls1

iTrader: (4)

even with stock cast 99 heads with full boltons an auto will be in the 320-340 range. Now look at his setup and you will see something is clearly wrong. That should be a 400+rwhp setup.

orangeapeel

iTrader: (18)

My forged motor did the same thing. I was actually running nitrous rings with -8cc diamonds and a TCI 3800 nitrous stall that flashed about 3000. It was loose as a goose. Were you filling the shop with smoke on the dyno? My blow-by was nasty in that aspect. Always burned oil under WOT conditions.

killerwhale

Its a mass air flow tune with hp tuners im gonna get some 243 heads do a port job hopefully that will give me better results

garygnu

do a compression test or a leak down test.if you take the heads off test the valves for leaks.

orangeapeel

iTrader: (18)

It probably isnt the heads holding you back. I think its a combo of your rings and trans/stall.

killerwhale

well theirs my dyno sheet idk if u guys can see it let me know if i need to get closer thanks for the help everybody!!!!

killerwhale

i think the other number in red was on 100shot wet kit but with a low bottle