LQ4 or LQ9

[renaldo99]

Im ready to swap my motor and i know ive read about these 6.0's but cant remember which is a better choice that will work great with my setup..

 

[ezdaar]

low comp allows far more boost.

LQ4 unless you are wanting to build a fordged bottomend.. to run high comp and a fair amount of boost..

 

[renaldo99]

low comp allows far more boost.

LQ4 unless you are wanting to build a fordged bottomend.. to run high comp and a fair amount of boost..

How much more boost can i run with a LQ4? im at 10lbs now on my 5.3

 

[ezdaar]

tottaly dependent on your tune, and how like the pistons hold....

 

[renaldo99]

tottaly dependent on your tune, and how like the pistons hold....

r these the only motors that will swap with my Tahoe? Can the tbss motor swap right in and work with all my bolt ons?

 

[ezdaar]

the short block can, but nuthin else is pure plug n play.

You would be bes off, ARP'ing rods, crank and heads and swapping in some good pistons into a LQ4.

You will push that 1900 close to max.

 

[renaldo99]

the short block can, but nuthin else is pure plug n play.

You would be bes off, ARP'ing rods, crank and heads and swapping in some good pistons into a LQ4.

You will push that 1900 close to max.

Oh ok got you..
Doesnt the LQ9 have more HP then the LQ4

 

[ezdaar]

NA, yess.. its a point or 2 higher in comp..

But you have a TVS1900, lower comp is ideal for higher boost that your looking for...

 

[renaldo99]

NA, yess.. its a point or 2 higher in comp..

But you have a TVS1900, lower comp is ideal for higher boost that your looking for...

wouldnt it be the same HP as the LQ9 if i put the LQ4 with a lil more boost and get a safe tune without blowing it up ??

 

[ezdaar]

would be alot more power

go with the LQ4, they easy to find and will handle more boost, thus make more power than the LQ9.

 

[renaldo99]

would be alot more power

go with the LQ4, they easy to find and will handle more boost, thus make more power than the LQ9.

OK im going to start looking

 

[blueflamed03]

yup, bossting, LQ4......LQ9 is like 10.5:1

 

[renaldo99]

yup, bossting, LQ4......LQ9 is like 10.5:1

doesnt my 5.3 have 9.5 ratio and the LQ4 9.4 is that a big difference??

 

[ezdaar]

I thought LQ4 was 8.8, but it seems with alil digging its 9.4 or 9.5..

So no, not mutch a change...

Drop in that LQ4, you will love it..

 

[bai78]

What year is that Tahoe?

 

[renaldo99]

What year is that Tahoe?

05

 

[03TahoeZ71]

Also find a 04+ LQ4. They have the stronger rods from LQ9 after 04.

 

[JKmotorsports]

If your tune is spot on, you can run an LQ9 with the boost you're running now. I'm running about 9.5 to 10 psi with my afr around 10.9 wot on my LQ9 for about two yrs. In cold weather, I've been up to 12 psi without any detonation or issues. Make sure you use good quality, high octane fuel and your tune is as close to perfect as you can get it.
Generally, lower cr is better for boosted apps, but if the tune is right, you shouldn't have any probs. I'd say go for an LQ4 for the safety margin, but I wouldn't pass up a good deal on an LQ9 if you find one.

 

[renaldo99]

Ok Ive totally changed my mind!!!! With the money i would spend buying a new reman LQ4 or lQ9 with install will be a waste of money for only 45-50hp tops...
SO ive decided to either get a 408 LQ9 short block or a 421 LQ9 short block and bolt all my stuff on to it.. I will be getting alot more Hp with almost the same amount of money with a stock LQ9 swap

 

[Tahoewhat]

Nice. Cant wait to see which one you get, heck either one, i want to see vids after. lol.