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safety question on e85 modding

Casper00693

Casper00693

New member
Hey guys just another opinion here besides mine, I'm looking at dropping pulley again and installing 1.9s for now before I take time out of my busy schedule to throw my stage 3 p&p heads on.

Currently I'm running an l67 block with SD headers and a gen v with a 3.5mps and e85@20* timing no kr which so ever wideband AFR at 11.2

Thinking of a 3.3 with 1.9s on 18* timing any suggestions here or opinions before I make the move.

On a gen 3 top swap I ran the same setup with a 3.2mps with a gen 3 pushing 20* so I'm curious as the gen v equation would be considered a 3.1mps if it was a gen 3.

Thanks
 


I already like you. Like most people, they try to run the smallest pulley they can with minimal timing, you seem to be opposite with a larger pulley and higher timing. Timing > Boost.

I run a 3.4 on my Gen V (Mods in my sig), at 16* of timing without e85. I bet you could easily run a 3.3" on a Gen V with close to 20* of timing still. E85 is wonderful stuff.

Start with your 3.3", set your timing at like 17* and go for a spin. No KR, increase timing 1* until you either see KR or get above 20*. If your still KR free after 20* timing on a 3.3, well, I'd invest in a 3.2" and start again.
 
Thabks man, I've been a big guy on timing over boost but on e85 I simply see a urge for more boost with this fuel. Thanks for your input.

By the way if you have a video of your exhaust sounds with those borla mufflers can you post up I am looking into borla also... What model borla are you running, thanks
 
Dude just run both. A bunch of timing and a tiny pulley. It's e85. I'm at a 3.0 with 21* timing. Granted I have an s1x, but I'm sure you could get close to that as I'm sure I could go down more if I wanted. Why choose?

Do both.
 


I have not seen worthwhile gains passed 17 degrees on e85 but you might widen the power band if you ramp the timing hard after 5500rpm.

You can run basically a 3.0 pulley on a gen 5 with little to no mods
 
So let me ask you fellow tuners another question... When tuning e85 let's say I am on pump gas and I adjust my 42.5s IFR table for pump gas... And now o switch to e85 do you guys just tune the maf table to compensate. For the fuel and leave pump gas IFR table as is? I ask cause I've done it this way before and I ran with my old setup a top swap... 42.5s, e85 plog, 2.5 dp 104s and a 3.4 with only 13.5* timing I managed a 13.6 my first pass with a 2.06 60ft.

Now I actually added 30% fuel to the IFR table and it looks like the stock 33# inj IFR table and I left the maf alone. This is a way of seeing 20* timing no kr no problem but it doesn't feel as powerful asy first time tuning e85 where I didn't touch the IFR table but just MAF... Did I make any sense which so ever. Sorry
 
Yeah just do it via ifr table. I did it by just switching injectors to 42# in the beginning. always ran slightly lean and got a little knock. Now tuned properly. A bunch of timing, small pulley and no knock. Ifr table for the win.
 
By the way I'm using DHP tuner if I could honestly get to speak to someone on a phone to better conversate these tuning questions that would be awesome lol
 


Well then if I'm going by IFR table then I'll just drop pulleys I guess and go that route. Let me say that with current setup I've done 50mph-120 runs with not one blimp of KR just figured I'd ask again. Thanks
 
Quick clarification: I set my ifr to what it's suppose to be at and then I set each cylinders skew rate to 133. Either way works, either inflating the injectors 30 some odd percent over where they're rated or just adjusting the skew. I prefer skew so my dic show my 13mpg accurately...

All these questions have been answered by frosty in a great writeup he did in the tuning section btw.
 
You'll be tempted to lean your AFR out, don't give in to the temptation. Keep it at 11.2-11.4
When you go between gas and E85, only adjust your IFR, the rest doesn't need to be touched.
 
I have a nice thread in my signature for tuning e85. Personally I found Boost > Timing. Also with E85 try to run richer if possible. E85 doesnt make the engine bog down from overfuel until your well below the 10:1 range (Gas calibrated wideband) Personally I shoot for 10.8. The cooling effect from the added alcohol is HUGE.
 


Alright Frosty instead of modifying the IFR table I put that back to 42.5s for pump gas and modified the skew table like you mention I'll try this out once I get off work and see how she likes it. I'll aim for 10.7-10.8 on the pump gas WB and report back. Still looking forward to dropping that pulley though just need to order me a new 3.3.
 
For example... A cam lol I plan on getting another block and just throwing in an intense stage 1 can with my p&p heads but that'll take some time and I'm desperate for more HP already lol I got bored and threw another degree of timing at it and still no LR and. Dropped the AFR to 10.6 so I have to up of a tad on the AFR. So does anyone know the actual math numbers to calculate fuel AFR vs ethanol to get that correct numbers?
 
chrsmi1 said:
Quick clarification: I set my ifr to what it's suppose to be at and then I set each cylinders skew rate to 133. Either way works, either inflating the injectors 30 some odd percent over where they're rated or just adjusting the skew. I prefer skew so my dic show my 13mpg accurately...

All these questions have been answered by frosty in a great writeup he did in the tuning section btw.
Click to expand...

Frostys skew was changed to 1.22 for summer e85 or (122% in dhp i think). Is 133% the way to go? Just wondering which is correct? I would like to see my DIC working somewhat still so I have a close estimate on where to go find some e85..lol
 
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