some how i am getting lost. i am probably just over looking something but in my eclipse i run 12.0 at wot. and rich is anything more then 11.0 and lean is 13.0 or greater. so i am lost somewheres here.
No. You are on track, for your eclipse.
We like to run a little rich on the LSJ. Most guys like 11.5 - 11.9. So that is pretty much on track with what your used to.
When I was doing my E85 research I found a Subie guy and EVO guy and they ran their E85 converted cars at 11.8-12 (gasoline) afr on their cars. Some guys would lean the car out to 12.2 - 12.5. Again those are afr numbers based of off gasoline calculations.
Instead of changing my stoich afr from 14.7 (gasoline) to 9.765 (E85) AND all my other fuel settings in my tune I left them to the gasoline settings. I also left my wideband to read gasoline afr. It is a very common practice for E85 converts.
When the wideband and your cars rear narrow band calculate afr it is based off of lambda. It then multiplies the lambda readings by the stoich fuel setting in the tune.
NCState said it best.
Quote:
Originally Posted by NCStateRedline
It is the lambda converted to a gasoline stoichiometric readout, which coincidentally is the correct lambda for ethanol (just not reported that way).
so if you were running on gasoline at 12 AFR the lambda would be
λ=12/14.7(the stoichiometric ratio for gasoline)=.816
running ethanol at 7.968 (which zzp did) the lambda would be
λ=7.968/9.765 (the stoichiometric ratio for e85)=.816 (coincidentally the same lambda as running gas at 12)
The readout multiplies lambda by the stoichiometric AFR of the fuel burned to give the readout we're used to and because it was still set for gasoline, it multiplied it by 14.7 and got the 12
I am running a little rich to be safe. That is why my afr is where it is. I should be able to lean the car out for more power. But as I found (on pump gas) the difference in a few afr points is not worth the gains to give up the reliability.
Stoich is different for E85. So the numbers come out different, I believe.
Yes but lambda is the same. So I left everything set to a stoich setting of 14.7 because that is what I was familiar with. So the numbers come out the same.
Technically, I should change everything in my tune to reflect a new stoich value of 9.765. But I am not that smart. However, I know someone who is and I think we are going to take a look at it soon.
so you change your tune but you left the reading the same? why switch it to read lamba if your use to reading gasoline.
The car/wideband always reads Lambda. Once it has the lambda reading it multiples it by the stoich valve to to determine/display the proper AFR readings.
If it multiplies it by 14.7 or 9.765 I really don't give a dam. But I did not want to deal with all the afr based tables in HPTs to make sure they get updated. So I left everything alone.
Josh is going to going to help me get all the tables updated properly to display/use E85 afr readings.
Quote:
Originally Posted by Watts-Up
Nice work with the heaton I want to see what the tvs will do. So are you finished with the m62 now?
The M62 is going back on the shelf. I'll be honest and say I am going to miss the tq from the M62.
2.7" M62 E85 vs 3.15" TVS on Premium 93 octane
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However, I know someone who is and I think we are going to take a look at it soon.
BYE BYE 375WHP 302 TQ TVS REDLINE ON STOCK BLOCK
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