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Thread: Tuning with lower compression

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Posts: 1-5 of 5
2011-10-27 20:32:10
Tuning with lower compression
Okay, I have this question buzzing in my head for a while now.

In the future, I plan to replace my old SR20DE with an SR20VE.

I have a Calum RTv2, with a stock VE program, except for a DE MAF.

Hoewever, the VE will get a lower CR for a while, until I have saved up enough money to go turbo.

What do I have to modify on the .bin to accommodate for the lower compression (being 9:1 from CP Pistons)? Timing? Fuel? Other?

Let me know!
2011-10-30 13:34:16
2011-10-30 13:37:16
If you dont touch the tune it will be safe.

you can add some timing for the lack of compression. I would assume you would be a little rich also but nothing crazy.
2011-10-31 01:44:46
It will feel a little weaker with 10.3cr timing on 9cr one, other then that it should work fine.
2011-11-03 13:28:51
Okay. Thank you. But what needs to be done to adjust for the 9 CR, trying to get the best results?

And adding timing = advance or retard? Just for my mental picture :P. But you mean making the numbers on the map higher :P
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