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Thinking of converting to E85.. Yes or Ne??

tms8582 said:
My friends 01 Gtp Daytona 500 has a metal tank btw. Just sayin check it out
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I checked and it is a plastic tank. Since swapping the power source of my rewire from the fuse box to the alternator it seems to have helped a bit. Now at WOT, the car is a low-11's AFR until about 5500rpm, and then slowly creeps up to a low 12's AFR (12.2 max at shift point). I'm going to replace the filter just for kicks. One thing I noticed is that my LTFT's are now mostly in the negative. When cruising they go as low as a -17.1, but then back to 0 at WOT. I was told they should be +/- 10 at the most, so maybe that has something to do with it.

Regardless, I have heard of guys running mid 12's for an AFR with E85, so I think it can still be tuned well enough.
 


Chris..

If you need some braided lines instead of the plastic, LMK A local just took his off his car as he parted it out. I'm sure he'd be willing to sell.
Also on the rewire going to the alternator, you may want to move that over to the battery. The battery is your more consistent power source. The alternator is turned on and off by the pcm based on certain parameters. Like being under 600ish rpm etc. If you wanted to ensure the best source, I'd run a big 3 setup that feeds from alt to batt and fuse box and connect the FP to the batt.
 
I want my afr to run in the mid 11's so I can safety drop a pulley and/or ad more timing. The problem is it keeps leaning out into the mid 12's come the 6200rpm shift point and I can't figure out why.
 


I meant I knew it was a pressure issue just didn't know where. Well, I emailed PRJ and he said to check the hose connection in my fuel pump to make sure it is tight enough. I pulled the pump this afternoon and discovered that the module hose was not fully connected to the top of the canister. There was about a 1 cm gap. Let's just say problem solved! My AFR is now at about an 11.7 max at shift point (6200rpm), and I no longer have hard starts. The pump was bleeding off pressure.
 
I run it every day... Its awesome. It smells good. You can run lots of boost. Its much more forgiving (Less likely to knock a piston out if you go lean).

It also sucks if you cant find a station and you car WILL start funny in the cold. It will always start but it will be a bit cranky about being woken up in the cold. Mine even started on a -35* day last winter. It took about 5 full secconds of cranking and then a little throttle to stop it from chugging but whithen 15 seconds it smoothed out and was happy as a clam.

Worried about not being able to find it in a pinch? I bought a mini afc and if I cant find e85 I just pop the mini afc inline with my maf. Scale it back 25%. And then Swap 2 or 4 pulley sizes up. Takes about 5 mins when you have the 5mm hex wrench, 15mm wrench, and pulley in the trunk. I only had to do it once when I drove all the way down to empty to this station that supposedly had e85 but found out they did not.
 
Flame front propogation and the fact that anything passed 15 or 16 is beyond MBT. You might want to make up for timing creep with some fancy stuff, but I wouldnt attempt it without a dyno and some knowledge.
 
darkhorizon said:
Flame front propogation and the fact that anything passed 15 or 16 is beyond MBT. You might want to make up for timing creep with some fancy stuff, but I wouldnt attempt it without a dyno and some knowledge.
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I think you just like hearing yourself talk.
Chris' car is in good hands <3
 


crbquist said:
Why would you want to keep timing low? You can run more timing and boost with E85 due to it burning a lot cooler than 93.


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From my limited experience with E85, it seems to prefer boost-heavy combinations vs advancing timing. The cooling effect on the charge really is conducive to adding boost and the results are usually spectacular. Not sure why, but they don't seem to respond as well to added ignition timing vs gasoline stuff.
 
I agree. When I run 20* of timing and a 3.0" Pulley my car does not feel NEARLY as quick as my 2.8" pulley and 14 - 15* of timing.... though I am running high compression so peak combustion is reached much much sooner. This was also proven on the dyno that no gains were had above 15* of timing on my setup.
 
frosty said:
I agree. When I run 20* of timing and a 3.0" Pulley my car does not feel NEARLY as quick as my 2.8" pulley and 14 - 15* of timing.... though I am running high compression so peak combustion is reached much much sooner. This was also proven on the dyno that no gains were had above 15* of timing on my setup.
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I'd be interested to see these dyno plots.
Can you produce them?
 
That is interesting. When we dyno tuned my old setup, when i switched over to e85, it was only past 22* that the power increase became negligible. That was 17psi.
 


Timing vs Boost vs Fuel Type

Yes we need more info who's got it?!!!!

Anyone know if OrangeL67's build was on E85 that thing ripped for pretty mild mods.
 
Just to be clear... Danomites car made almost 25whp more with added timing over 15*... on e85.
I stopped at 21.5* of timing. That's 6.5* over 15* for 25whp...
Anyone who thinks that timing above 15* produces negligible gains is simply wrong.
 
Need to compile a spreadsheet or something

Timing / Boost / Fuel type / Dyno numbers

This could get really interesting real quick.
 
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