MYTURBOT/A

Has anyone came up with a stock for stock perfomance differance on a FI setup between the lq9 and lq4 6.0 heads?

smokinHawk

iTrader: (48)

I thought they were the same.
no one has shown any diffence between them, except one costs more.

y2khawk

iTrader: (5)

um, all the 6.0 heads are the same. Well, there are a couple different versions based on the casting process.

The CR difference between the 2 motors is the difference, not the heads. LQ9 = flat top pistons, LQ4 = dished pistons.

10thanvhawk

NOT AGAIN...


we need a charley brown ARRRRGGH smiley emoticon.....

y2khawk

iTrader: (5)

not again what?

10thanvhawk

the repeated question of Lq4 vs LQ9

the question of differences and power etc.

I will admit it is asked more over on LS1.com

MYTURBOT/A

It`s asked so much because nobody so far has been able to answer it. Two sets of heads two differant part #s . Some say there is no differance but they can`t tell us why GM used two differant part #s for the same heads. Some say the lq9 heads are better but know one has flow numbers or proof. just wondering if somone had flowed them and put this debate to rest. Sorry.

y2khawk

iTrader: (5)

part numbers are different because the base casting is different, the machining process is the same.

It's not a lq4/lq9 thing, is a supplier thing.

MYTURBOT/A

OK now i understand whats going on, thanks. If you don`t mind me asking I read in one of your other posts that you arent using your O2 sensors. i would like to do this also what Do i need to do to run that way and how would i go about tuning this way?

y2khawk

iTrader: (5)

You basicically set the Temp to enable closed loop to the max value it will take. Then turn off all the 02 sensor codes.

You'll have to dial in your IFR and MAF with a WB O2 after turning them off, or dial them in based off L-trims before you pull the sensors.

If you're not gonna run leaded fuel, stick with them. No reason not to in that case.

MIGHTYMOUSE

iTrader: (59)

wonder which one came from the plant putting out the ls6 block.. they had the denser aluminum or somethin to that affect.. was that the mexico one? sonic test!

White_Hawk

iTrader: (3)

I think they come from Saginaw, but don't know for sure.

-Geoff