im deciding weather to run e85 out of the pump wat are peoples thoughts who is currently running it? does it make a difference to performance etc cheers

E85 out of the pump is blended different based on time of year and a few other factors. Also it depends on if they blend it with 91, 95 or 98 for the octane rating. There is a few cars in the ACT now running dedicated e85 out of the bowser and are doing pretty well with it. I would suggest using a tuner who understands the difference and worst case scenario for using e85 out of the pump and have them tune for that. If your racing the car and are half serious you can order 044 drums of CSR E85 or whatever. This will get you the consistenancy if you want to run it at its best. I believe Justin @ Tuff Car Parts has this available to him.

i got mate running e85, and done 395hp on the dyno. with a 25 head n cooler, unsure of what turbo he has but.

We found scary inconsistencys in the pump stuff, its okay if your going easy on it but definately don't push the tune up

Quote: Originally Posted by RB2GO [View Post] We found scary inconsistencys in the pump stuff, its okay if your going easy on it but definately don't push the tune up Yeah the ****ers blend it with whatever... you can't count on it at all. I reckon the next generation of ECU's will be more capable with flex fuel tuning.

Depending on your Current ECU - you can get a Flex Ethanol Sensor that will determine how much Ethanol is in the fuel, and let the ECU know. A good tuner will be able to take that into account when tuning. I am getting my VL tuned currently on Pump E-Flex (E85 is really the max ethanol.. will be between E70 and E85 depending on season blends - it is currently E70 btw). As I am running a NisTune - I can't have the ECU run external inputs for the above mentioned fuel sensor. The tuner is going to leave the tune a little rich so if the blend does change - its not going to blow the motor to pieces. Being that I pick the stuff up in Jerry cans anyway (210L per trip), i'll be testing each batch to watch for the season change. Testing Ethanol amount is easy. Once the season changes, i'll pop the VL back for a touch up tune on the new blend. This is probably being over-cautious, and probably a lot of work just to run it on E-Flex.. but oh well.. E70/85 is really good at running the engine cooler and being more resistant to detonation. For less than $1.20/L - Why not?

Yeah the tuner is up to date with all E85 stuff so im all good there im getting it tuned this week on the EFlex stuff see how it goes!! Im looking forward to seeing how much of a diff it will make!

Give the fuel a test every now and again to keep an eye on the blends. If it changes dramatically - get your tuner to go over it and make sure it's all good. The specific energy of Ethanol is less than that of Petrol - therefore, more Ethanol is needed to run the car stoich (roughly 30% more - 9.7:1 AFR i think is what is needed for 100% Ethanol, as opposed to 14.6:1 AFR for Petrol. With the E70 blend, its more about 10.5:1 AFR needed). Current blend is E70 (minimum amount of Ethanol), so if the blend changes - you car can run lean (which is bad). If it was the other way round (going from E85 tune running on E70) - it wouldn't be so bad - the car would just run rich until you got it sorted out. (p.s. don't quote me on precise AFR's mentioned - these are rough numbers from what I remember from what the tuner was telling me)

I was recently reading a thread on skylines australia where a guy had hooked up one of the sensors which insanevl mentioned to run with I'm pretty sure an autronic. So basically the ecu altered the map itself depending on the ethanol content of what came out of the bowser. Sounded like it worked perfectly also

If I was running a standard A8 motor with a high flow t3 at 1 bar, steel HG, stock cam, nistune, Z32 what size injectors should i be looking at for pump e85 and will a single 044 support it?

Tuxedo, My setup is similar, except I have a Wade 818b cam. I have 1 x 044 pump up the back - this should hold a good 350 rwhp on e85... next upgrade I do will need to have more pumps - but am starting to get on the limit of 1. Injectors - I am running 60lb injectors (660cc) - again, I suspect I will end up getting close to 80% duty cycle on the new tune, so they will do for now - but will need to be larger if I end up upgrading the turbo.

What size feed and return lines? Or still using standard items? I was thinking of using braided teflon hose.

The factory lines would do it ok.. The extra pressure with EFI makes running a 5/16" feed pretty versatile. If you where running a carb with only 7-15psi then I would be saying 1/2" or 5/8" for sure. Its all a balancing act, run smaller lines need more pressure at the pump all good if you have plenty of pump to spare. If I was running an 62mm compressor, say something like a 35r or whatever I would have a 2 or 3 litre surge, twin 044s (or applicable Magnafuel or Aeromotive pump) into a single 1/2" (AN-8) Teflon or Alloy Tube line to the front of the car. If I was feelings stingy I would use the factory feed as the return, if not a 3/8 or 1/2" return back to the surge. AN-8 Feeds and Return would **** in 1500hp

Im using 1/2 inch feed & return

Quote: Originally Posted by OVR-800ST [View Post] Im using 1/2 inch feed & return I know I sold it to you With the newer technology injectors on the market there is no reason not to over pump and injector in case in the future you want to run E85. The ID1000 sized injector from Bosch is becoming very popular and can be had for reasonable money. Some original photos have not been recovered yet.

Would the factory hard lines and fuel rail cope with the corrosive ethanol? I have already lined the inside of the fuel tank.

It won't eat through metal mate. It will kill 25 year rubber lines though pretty quick. I should revise that comment. It is somewhat acidic and as such will slowly eat through a lot of things. However aluminium is very tolerant.

I know you can make more power with E85 from the pump but I just dont see the point in tuning something that is so inconsistent and has the possibility to blow your motor and wreck your fuel system. Why not have 10-20rwkw less and run BP98 that you can buy in any suburb?

Its not to hard to account for the variances in E85.. AFR's will be fine as you would tune for 85% ethanol and as the ethanol content drops back your AFR's fatten up, but it the risk to detonation when the octane rating drops. The guys they are tuning for it are getting great results. On pump you can realistically only support X amount of HP per litre depending on setup. With E85 you can increase it significantly.

I'd steer clear of pump E85, I've seen the problems it causes. The drum stuff is totally different.