don't know about the turbo but on 93 octane 750's and the in tank pump is all you need for up to 500whp. not sure on e85 with the extra flow required. if you're not going over 500whp e85 is probably overkill.

 

I'm doing it for cooling reasons mainly. I would like to do a few track days with it in turbo form without cooking the oil. Should be alot of fun. I will have a low boost setting for the track to keep the stress down to a minimum.

 

I did run my previous turboed s2000 on e85, I intend to end this s2000 project I am doing now with e85 aswell. I will go with a single walbro, 1000cc injectors and I will possibly change the wiring to the pump, add a relay and a larger fuse. Then I am good for 400whp no problem. I am shooting for 350whp. My previous car had 675cc injectors that maxed out at about 330whp, with a slightly raised fuel pressure.

If the fuel system is sufficient I see the following pros and cons with e85.
This is just the things that came to my head while writing the post.

Pros:
1. Safer to tune Less risk of detonation/knock, allows higher compression.
2. More consistent quality of the fuel (at least here in Sweden) than regular pump gas.
3. "Racefuel" E85 is ~104-105 octane fuel, making it like a cheap race gas.
4. Cools the engine very well.

Cons:
1. Not as good cold start capability as regular pump gas. Can be partly solved with the engine management, but if its cold enough you will have problems. (this is not an issue for me as I use my s2000 as a summer car)
The vaporizing temp of e85 is much higher than regular gas.

2. Fuel consumption. Yes you will have worse mileage with e85. If you are going on longer trips with few e85 stations and the small tank, you might have to plan the stops.


I think e85 on stock compression and relatively mild boost is the way to go for a efficient and fun setup.

 

s2kswe what boost setting were you at when your injecotrs were maxed out?

Anybody have a definete answear as to if my fuel system will be sufficient. I will be using 1000s with a single 255 pump. I also could put on a fpr if necessary. I will be turning the boost up untill my t3/t4 is not efficient anymore. I do not think I will go over 20psi depending though.

Martin

 

just a quick search I found that stoich with e85 is 9.765:1 compared to gasoline's 14.7:1. max power on the rich side was 6.975:1 vs 12.5:1.

obviously these are general numbers but that's about 40% more fuel than running regular gasoline. so if 750's will get you 500whp on 93 octance I'd guess you would need 1200's to get the same power on e85.

as far as the fuel pump if your goal is 450whp you're probably right on the edge of maxing out the stock pump depending on the af ratio. that's just according to a fuel pump calculator I found. on 93 octane you're at about 170LPH at 450hp, add 40% for the change to e85 and you're around 238LPH. that's about 94% of a 255LPH fuel pump's capacity. figure you typically don't want to push your fuel injectors past 80%, I guess the same should go for the fuel pump, so you would probably need a single, larger pump, or twin pumps.

I personally don't like running a second inline pump or two pumps for the simple reason that if one fails the car will still run, you won't know there's a fuel problem until the car runs lean in boost when it can't keep up with the fuel flow. I'd personally rather have one pump and if that fails the car simple stalls. now if you're running a V8 (or any V motor) and you have one pump run one bank of injectors on side and another pump on the other side that would be fine. if one whole side failed most likely the motor would stall and you would know there's a problem

 

[QUOTE=Shftat9k,Mar 25 2009, 12:24 PM] s2kswe what boost setting were you at when your injecotrs were maxed out?

Anybody have a definete answear as to if my fuel system will be sufficient.

 

There are reports that Walbro doesn't recommend their fuel pump with E85 and there are a lot of reports with Walbro failures also. It's probably best to use the Bosch pumps guys.

 

I've been running e85 for roughly a year now. (not on an s2k, but a gti)

Intank pump + walbro...both work fine to this very day.

fuel lines are perfect...no corrosion or destruction, etc

I'm running 630s @ 4 bar....I wouldn't go too far past 300 on injectors this small.

If you're looking for 350whp out of a 60 trim....stick with pump gas...e85 would be completely unecessary for that.

Honestly it's a love hate relationship...no detonation with an insane timing map + lots of boost...car runs 10c cooler (I've logged this) BUT you get V10 gas mileage...cold starts suck..sometimes it doesn't start until the 3rd try...e85 availability sparse on the west coast.

E85 should essentially be used as a bandaid for an inefficient turbo system....if you're way past compressor efficiency....go e85.

If you want insane timing for big dyno numbers...go e85.

But if you are building a setup from scratch....just buy the appropriate size turbo, that is efficient at the hp levels you want...and you won't have to run lots of boost, or timing, or e85....and you get to have decent mileage too.

 

^How cold do you mean when you say cold start sucks?

 

never had cold start probs with my car. even when everything was frozen around me it starts right up LOL might be because cold start map wasn't tweaked