Most compression on LD9 w/ a stock computer - Tuning Forum

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Most compression on LD9 w/ a stock computer
Wednesday, December 14, 2005 8:31 AM
Just as the topic says, what is the most compression you can run on a stock computer and where can you get them/how much?

Thanks.



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Re: Most compression on LD9 w/ a stock computer
Wednesday, December 14, 2005 8:34 AM
The computers don't see compression, they see knock. If you can keep the knock down, and the engine spinning, you could run 20:1 on a bone stock ecu... If you up the compression, you'll have to use premium gas to help keep the knock under control. I think I have seen people go as high as 11.5:1 or so.





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Re: Most compression on LD9 w/ a stock computer
Wednesday, December 14, 2005 8:41 AM
From what i have been told when i asked this question you can go to 11:1 but with tunning you could do 11.5:1 I think11.5 is what the older quad engines were running i believe more specificaly the w41.


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Re: Most compression on LD9 w/ a stock computer
Wednesday, December 14, 2005 11:43 AM
The Ho and W41 had 10:1 compression.

Alky injection is good on N/A engine too.



Gilles
2.3 Ho

Re: Most compression on LD9 w/ a stock computer
Wednesday, December 14, 2005 11:58 AM
i wouldnt run more than 10.5 on the stock

11 might be pushing it expecially if you are using forged pistons

cause they will rattle some when they are cold , and might cause some knock retard


like mfk-223 said water/alky injection is good for n/a motor , more so with higher compression ratios







Re: Most compression on LD9 w/ a stock computer
Wednesday, December 14, 2005 2:55 PM
11.5-1
Re: Most compression on LD9 w/ a stock computer
Wednesday, December 21, 2005 8:32 AM
I know you can run as much as you can, as long as you keep the engine from knocking. I should have been more specific but, i was looking for how much compression on a stock ecu on 93 gas and possibly octane booster w/o having to retard the time...probably better go 10.5:1 or 11:1...

Where can you get those compression ratio pistons? maybe .020 oversize?price range?

As far as alcohol injection...this is probably a stupid question, BUT...what kind of alcohol do you use? where can you get it? anybody make a kit or know how to setup a homemade one?price range?


Thanks
Brian



99CavyZ ~ Black ~ 5-Speed
"If It Bleeds For A Week Straight, How Come It Doesn't Die!?"


Re: Most compression on LD9 w/ a stock computer
Wednesday, December 21, 2005 8:48 AM
talk to karo@carcustoms.net







Re: Most compression on LD9 w/ a stock computer
Wednesday, December 21, 2005 10:29 AM
you will have problems above 11:1




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