I have a 99 z28 i blew the motor car is at shop now but I can’t decide if I should have my LS1 rebuilt or jus swap the LQ9 in...the price is just about the same...any advice will be appreciated thanks

 

You blew up the engine?

What is the current engine's condition and how much $$ do you have to spend?

 

When my LS1 blew I bought a TMS LQ9. No regrets

 

I had a LQ4 block.... went to a LS2 block. I learned my lesson the hard way. Go aluminum and you wont regret it. My car feels so more responsive with the LS2 over the LQ4 block with the same exact heads,cam,intake.... weight matters.

 

I just had to move the original heads from one garage to another. Reminded me of just how fng heavy iron engine components are. That 100lbs is about 3% of your car's weight. What would you do to make your car 3% faster? Would you wanna make it 3% slower?

 

well it has a rod knock now..I took into tha shop to have it rebuilt but they had a couple of lq9s there and were recommending that I go that way instead of my ls1...price is jus about tha same

 

I went to an LQ9......the extra weight of the block made ZERO difference in anything with my street car. Acceleration, handling, stopping, etc. NO CHANG. For a street car you won't feel anything different....its a myth or its in peoples heads. Maybe for a purpose built road race car or competition drag car you will notice...all else being left the same.

And the only iron part thats different.....is the block. All other parts come straight from your old LS1 so they are the same weight as your aluminum LS engine had.. Makes no sense to go aluminum, aluminum has issues that iron doesn't....later on you can build the iron block to handle the same or more (reliable) power than aluminum.

 

Thank you to everyone for your input appreciate it

 

100LBS added to the front of a rear wheel drive car......not a good idea if you like traction. Not that its going to make all the difference in the world, but it does factor in. Some people go through great trouble to move their battery to the back for traction.....why would anyone want to add 100lbs up there unless they were beyond the strength to power capability of and aluminum block. Just my .02

 

I like to think of it as building an engine to reach higher power capabilities by using a foundation capable of sustaining those big power levels, especially when boost gets thrown into the equation. "You know something to build on when your looking for more which is what just about everyone who loves racing and making power do".

 

Yea if he’s trying to make 1000+hp I agree.

 

You'ree right....it doesn't make all the difference....in my car it makes NO difference. I hook the same with my iron block.

Just think of all the badass boosted drag cars with LSX iron blocks......they have 200+ lbs added to the front end (block + boost set up)........they dead hook.

 

who does your tuning? Need a good michigan tuner

 

The original poster hasn't posted here in a year and a half. Doubt he's still watching this thread.

You'd do better by searching in the PCM & Tuning Forum, or by posting in the Midwest regional forum.

That being said, Livernois Motorsports does plenty of tuning and they're in Michigan.

 

LQ9, at least you can stroke it to a 408 if you even wanted too.