Target Static compession on E85?
11-06-2007, 04:51 PM
#1
Target Static compession on E85? Thinking about going "on the corn" with a 408 CI LSX, using either LQ9 heads that I have now or switching to L92 heads and the GMPP single plane.
What seems to be the ideal compression ratio when running E85? Do you want to have a higher compression ratio when going to E85 or stick with 8.2-8.7 static and turn up the boost???
What seems to be the ideal compression ratio when running E85? Do you want to have a higher compression ratio when going to E85 or stick with 8.2-8.7 static and turn up the boost???
11-06-2007, 08:57 PM
#7
A wideband doesn't care about ratio, only Lambda. Tuning for 14.7:1 AFR (lambda 1.00) on gas and then switching to E85 will still net you a stociometric mixture (lambda 1.00).
Widebands don't care what the fuel source is.
If I run 11.0:1 AFR on gas and then go e85 and still use the same wideband, I'd still target 11.0:1 AFR on the wideband and it would be the correct mixture. The wideband would just be displaying an incorrect AFR for the fuel but would still be correct because the lambda is the same.
Widebands don't care what the fuel source is.
If I run 11.0:1 AFR on gas and then go e85 and still use the same wideband, I'd still target 11.0:1 AFR on the wideband and it would be the correct mixture. The wideband would just be displaying an incorrect AFR for the fuel but would still be correct because the lambda is the same.
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11-06-2007, 09:05 PM
#8
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A wideband doesn't care about ratio, only Lambda. Tuning for 14.7:1 AFR (lambda 1.00) on gas and then switching to E85 will still net you a stociometric mixture (lambda 1.00).
Widebands don't care what the fuel source is.
If I run 11.0:1 AFR on gas and then go e85 and still use the same wideband, I'd still target 11.0:1 AFR on the wideband and it would be the correct mixture. The wideband would just be displaying an incorrect AFR for the fuel but would still be correct because the lambda is the same.
Widebands don't care what the fuel source is.
If I run 11.0:1 AFR on gas and then go e85 and still use the same wideband, I'd still target 11.0:1 AFR on the wideband and it would be the correct mixture. The wideband would just be displaying an incorrect AFR for the fuel but would still be correct because the lambda is the same.
11-06-2007, 09:19 PM
#12
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https://ls1tech.com/forums/showthrea...&highlight=e85
read the negatives...have seen other non ls1 tuned...but imports with low impedance injectors. 1000+ cc's so they have enough injector to run it and high boost
11-07-2007, 07:48 AM
#16
In general with NA applications, you have to run a lot more compression with ethanol than gas to achieve the same power level on similar setups. If you are going to run about 15psi, you can pretty easily run 10:1 static compression. That is the beauty of ethanol, is that it is highly resistant to pre-combustion detention.
Of course there is the down side in that you will have to run a lot more fuel. Gas requires 14.7 oxygen molecules to burn one, while ethanol is around 9 I believe.
Keith
Of course there is the down side in that you will have to run a lot more fuel. Gas requires 14.7 oxygen molecules to burn one, while ethanol is around 9 I believe.
Keith
11-07-2007, 10:50 AM
#18
I am aware of the added fuel delivery needed, and ~30% seems to be the magic number. IE BIG pump, lines and 160# Injectors....... I got that.
What I am after, is knowing that E85 will support, and works best with big compression (NA for example 14-15 to 1) Is it benifical to raise the static compression on a boosted application, or leave it low IE 8.5 to one and run more boost???
Just FYI there is a good thread in the Fueling section of this board dealing with the ins and outs of E85
What I am after, is knowing that E85 will support, and works best with big compression (NA for example 14-15 to 1) Is it benifical to raise the static compression on a boosted application, or leave it low IE 8.5 to one and run more boost???
Just FYI there is a good thread in the Fueling section of this board dealing with the ins and outs of E85
11-07-2007, 01:32 PM
#20
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