Finally Switched Back to E85 -FP Green

[mitch86]

I finally went to E85 as my car was driven 65 miles a day and 93 made more sense for that...Anyway, I picked up about 80-90 hp per link. My 93 timing was at 11 deg max and I was making about 360ish hp. After switching I did a few pulls yesterday and with timing increased to 17 deg max I picked up some nice power. Link showed 448hp at about 6400rpm and 24psi. I was approaching traffic and let off a little early..

I was seeing about .4deg of knock intermittently. I don't think this is a problem but what do you guys think? Also, what kind of timing increases vs. 93 have you guys seen with E85, keeping boost constant? Im just trying to get a feeling on how hard I am pushing the car and it's capabilities on E85 with the Green.

Any thoughts/suggestions on the attached logs is appreciated!

Thanks!

 

[fran_drivertsi]

weird, green shouldn't be that laggy.. you get full boost by like 5300rpms.. Good log otherwise and .4 of knock is nothing to worry bout imo.

Lex

 

[mitch86]

Yea, my timing is pretty conservative on the low end..I'll try adding some down low to help with the lag..When I'm on the highway I seem to get full boost around 3800-4k but when I do a pull and floor it at 2k it seems to take longer to spool..

 

[donniekak]

I run 30 psi, 20* peak, 12.4:1 afr.

 

[pboglio]

Holy crap those are big gains. Is that coming from increased timing and boost, I can't view the logs?

 

[mitch86]

I run 30 psi, 20* peak, 12.4:1 afr.

So you're running 7.8:1 CR Pistons I take it with the stock rebuild?

Holy crap those are big gains. Is that coming from increased timing and boost, I can't view the logs?

Mostly the 6 deg increase in timing. The boost is within a couple PSI of the pump gas settings..I'm not sure exactly what they were...I can't view my logs on this computer..

E85 is sweet stuff.

 

[donniekak]

So you're running 7.8:1 CR Pistons I take it with the stock rebuild?



.

Yes, but i have seen similar numbers run on built engines at 8.5:1. I was running a lot more conservative of a tune until some trusted locals informed me of how far they push e85 on 5-700hp setups.

 

[95blackGsTurbo]

E85 is great stuff when used to it's full potential. It seems kind of weird that you are seeing knock already at just 17* of timing on 24psi. I would think you could get into the low 20's for timing easily and in the 12.5-12.8:1 AFR range without any knock at all.

 

[mitch86]

Here is the 1g estimated timing per DSMLink that I run for 93 and E85:


RPM
2.5k 3k 3.5k 4k 4.5k 5k 5.5k 6k 6.5k 7k 7.5k 8k

93

11 12 10 9 9 10 10 11 11 11 11 11

E85

11 14 13 12 12 13 14 16 16 17 17 17

Any thoughts/suggestions on where I should/could add more timing safely to make more safe power are appreciated! Is this the typical timing difference for E85 and 93 that you guys have seen? I'm at about 11.6-12 afr on E85 currently..

Thanks!

 

[420a-t]

Low end until it knocks. It will help spool-time.

Also, have you tried to up the boost anymore?

What I see most peoples setups are mid-teens timing, lots of boost, and around 12:1 afr. This is usually on a little bigger turbo though if that helps at all.

 

[mitch86]

I will try adding some timing down low to try and decrease spool time. Does anyone else with similar mods have their timing to post for comparison?

 

[95blackGsTurbo]

Whats plugs are you running? What are they gapped to? I would be in the low 20's during spool-up and low-mod 20's at the topend.

 

[jrohner]

Low end until it knocks. It will help spool-time.

You don't want to tune E85 based on the knock sensor. It's too easy to add way to much timing before showing any knock.

If you add too much timing on the low end, it may HURT the spool. I hurt my spool about 500 rpms when I added a bunch of timing.

 

[mitch86]

I just put in some 7's gapped to .025". I was thinking of backing timing off a few degrees from 3.5k and up and doing a log then upping it a degree at a time to see when I stop gaining consistent power so I know where to stop. So if I'm gaining 10 hp for the first couple of degrees advancement then I see only a few hp gain after another degree of advancement I know to stop adding timing. From there I will up the boost holding my timing constant and see if everything looks good. Is this how you guys are tuning E85?

 

[95blackGsTurbo]

With almost any tuning. I always get the AFR dialed in first at the best level. In this case, depending on where the wideband is placed in the system anywhere from 12.0-12.8 is the best place to be. Also completely safe. I also start with a flat timing curve of 10 or so and adjust from there. Depending on what you log with, if you check your loads, the highest one will be your biggest torque spike which is also where your full spool is. Adjust based on that, if you start to lose spool back it up. Then just add timing to the rest of the powerband based on knock.

 

[mitch86]

I will dial in my AFR first as you suggested then begin with timing. I am using DSMLink V2.5, is there a way I can view load with that? I haven't been aware of it when I use it if it's there...Thanks for the advice!