Lower Compression Tuning - Tuning Forum

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Lower Compression Tuning
Monday, October 15, 2012 9:19 AM
I've been debating on what pistons to run on my eco cavalier; 8.9:1 or stock. I want to run the lower compression due to the size of the turbo but I honestly have no clue how to tune for the lower compression and would need to break in the engine on a tune for the compression. Any hints or tips?





"You can only feed them semen for so long before their legs fall off."





Re: Lower Compression Tuning
Monday, October 15, 2012 9:46 AM
tuning in




Re: Lower Compression Tuning
Tuesday, October 16, 2012 8:51 AM
I'm running at 8:1 give or take... it'll need more timing.

You'll notice it right away as you step on the gas that the car will have NO guts off the line. A lot of tuning of the timing tables will fix a lot of that.

-Chris-



-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...
Re: Lower Compression Tuning
Tuesday, October 16, 2012 8:58 AM
And it will need hotter spark plugs.



Re: Lower Compression Tuning
Tuesday, October 16, 2012 2:38 PM
jason norwood wrote:

And it will need hotter spark plugs.


Even with forced induction? I was planning on a 2 step colder plugs. Precision 300-6157, inter-cooled, 8.9 compression pistons



Re: Lower Compression Tuning
Thursday, October 18, 2012 2:14 PM
No he is not saying that he has forced induction. He is only lowering compression which will reduce the heat produced in the combustion process.

Yes with forced induction you will need a cooler plug as the boost is generating more heat, often times I have seen lowered compression with 7psi using a stock heat range.



Re: Lower Compression Tuning
Thursday, October 18, 2012 3:31 PM
Thanks for clearing that up for me, two thumbs up!



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