:nutz: Whats the difference between the LQ9 and LQ4:nutz:

[Lethalyoyo]

I would like to know the difference between the to because me friend that had a vortec max gets 18MPG and my 1500HD 6.0 0nly gets 10mpg at the best

[RedHeartbeat]

Compression ratio

Are both trucks 4x4? Are both trucks 4L80e trans? Do both trucks have the same rear end gears? Are both quad cabs? It all adds up. Are you both running the same size tires?

[hummertech]

most, but not all, of the hd1500 trucks were crew cabs with 4.10 gears and a 4l80e trans and a 325 hp lq4 6.0l. tha max trucks i've seen have been a lq9 345hp 4l65e trans w/3.73 gears... the hd 1500 trucks were 2500 trucks with a 1500 name??? i cant figure out why gm did that???...... the max trucks were 1500 trucks with cadillac engins. the cads have the new 6.2l active fuel management engines at 385 hp and 22 mpg!!!! all the max trucks have the extra cad engines that were not needed by cadillac any more. all my friends that have a hd1500 get 10-12mpg. thats normal for a 8 lug 3/4 ton truck. dont be fooled by the 1500 name.

[Lethalyoyo]

[quote]
most, but not all, of the hd1500 trucks were crew cabs with 4.10 gears and a 4l80e trans and a 325 hp lq4 6.0l. tha max trucks i've seen have been a lq9 345hp 4l65e trans w/3.73 gears... the hd 1500 trucks were 2500 trucks with a 1500 name??? i cant figure out why gm did that???...... the max trucks were 1500 trucks with cadillac engins. the cads have the new 6.2l active fuel management engines at 385 hp and 22 mpg!!!! all the max trucks have the extra cad engines that were not needed by cadillac any more. all my friends that have a hd1500 get 10-12mpg. thats normal for a 8 lug 3/4 ton truck. dont be fooled by the 1500 name.
[/q]
ya but what do i need to do to make my motor like that vortec max i need tha MPG Oh and the 1500HD is 1,000Lbs lighter that the 2500HD

[RedHeartbeat]

if you're staying naturally aspirated, you need the LQ9 pistons to bump the compression up. You need a good tune, Nelson can handle that. While you have it apart replacing pistons, get the heads ported, usually about $500 for that.

[Lethalyoyo]

ok here is the deal for all thoes like me who want to know there is nothing different between the LQ9 and LQ4 motor the only differance is the computer or the vin# for t he computer it is just the prigraming like timing and so forth. i hade one of my friends at Motor City bakersfield who is nown at the creat king he compared every part of t he 2 motors to the part numbers and found no differance

[chrisj6]

Umm yeah dude theres more of a difference than that. There is a higher compression rate in the LQ9, which is why it is less attractive for FI than the LQ4. The Crate King was wrong!

[RedHeartbeat]

You need better friends.

[SCIV]

<div class='quotetop'>QUOTE(chrisj6 &#064; Jun 28 2006, 04&#58;56 PM) [snapback]56544[/snapback]</div>

There is a higher compression rate in the LQ9, which is why it is less attractive for FI than the LQ4.
[/b]

SSSHHHHHHHHHH&#33;&#33;&#33;&#33; Don&#39;t tell my LQ9 that, I am gonna push 10-12 #s through that beotch&#33;&#33;&#33;

[Lethalyoyo]

ok im just posting what he told me any how if you can finde more than post it