Planning first booost build e-85 question
Planning first booost build e-85 question I have been searching for a little bit and I can't find a solid answer. I see that on 93 with a good tune 550 and 7-8lbs is the limit many say and recommend on LS1 with a stock bottom. What about on E-85. I was going to do a nitrous kit, but with the savings I jumped into the Huron group sale and got the T4 kit with a vs racing gen 2 7875. I plan on running E-85 as its very accessible to me. What is the max boost recommended to run on E-85 and what power level are we talking. I am looking at injectors and aren't sure how high I need to go. Are 80's enough or should I get like 120's? I am totally new to this, but it will be tuned by a very reputable shop in the Cumming Ga area as they tuned it NA and it runs great. I know you can add more timing with E but I haven't' seen how much boost you can add. Can you go ten? I was going to run a seven lb spring in the gate, but if i can go higher and need to just got a controller I will.
As far as the E85, just plan on something that can flow roughly 30% more that you were able to with the 93 octane and a fuel pump that can keep up. I run the Bosch 127# Injectors and twin 340lph pumps in the tank. As far as boost PSI, I don't think there's really a correlation of PSI and the fuel type. You or your tuner will be what determines the boost level. I've ran as high as 29psi on E85 but things like head gaskets, deck thickness, stud/bolt strength will be the real 'cutoff' on PSI. You're more likely to find the limiting factor to be traction before PSI.
Just be sure to log everything when you're out pushing it to see if you run lean (fuel pressure enough? Injector Duty cycle over 85%?) Or Knock? And then of course check to see if you're pushing coolant (head gaskets leaking, heads lifting).
Start out with stock timing till 105kpa then dial back the timing 1 or 2 degrees for every PSI after that to be safe(r) till you get a determination of how things are performing.
Just be sure to log everything when you're out pushing it to see if you run lean (fuel pressure enough? Injector Duty cycle over 85%?) Or Knock? And then of course check to see if you're pushing coolant (head gaskets leaking, heads lifting).
Start out with stock timing till 105kpa then dial back the timing 1 or 2 degrees for every PSI after that to be safe(r) till you get a determination of how things are performing.
It’s all stock bottom end. It has new head gaskets we did double springs and a cam in not too long ago maybe 2000 miles. The cam is boost friendly. Should I go with 80’s or some higher like 120. I think snake eaters has some 96. I’m hoping to get around 600 E-85 I would like it to stay together. It has a cam after market oil pump new head gaskets ls7 lifters and tray and Ls6 intake.
Last edited by Rainz/28; Feb 12, 2021 at 07:38 PM. Reason: Spelling
If you can swing it then I'd go for the biggest injectors you can find for your price range. Running the 127# injectors using E85 at 17psi my duty cycle was almost 78% at just 5,500 rpm. I have a 5.3 with PRC Stage 2.5 heads, ARP studs, Isky Triple 12 cam, At the time it went 6.4 @ 112mph in the1/8rh mile I was running a PT76 turbo w/intercooler. That was on street tires, full interior, daily driver, licensed, inspected, driving to/from the track without changing anything other than letting a little air out of the MT drag radials.
It’s all stock bottom end. It has new head gaskets we did double springs and a cam in not too long ago maybe 2000 miles. The cam is boost friendly. Should I go with 80’s or some higher like 120. I think snake eaters has some 96. I’m hoping to get around 600 E-85 I would like it to stay together. It has a cam after market oil pump new head gaskets ls7 lifters and tray and Ls6 intake.
Do yourself a favor and find a healthy Gen4 shortblock which has the better Gen4 rods (2004.5+ years) and then it will safely handle 900rwhp+. The limiting factor in your setup will be the Gen3 rods which above around 600rwhp will bend over time. Unless you enjoy swapping engines... just save your money and use a motor with the better rods. You will outgrow the 80lb injectors quickly with e85 as you get used to the power pretty fast. I would build the fuel system for future power goals and run -10AN feed with dual Walbro 450 pumps or even 525 pumps. e85 and boost are amazing and great bang for the buck fuel.
Reading people doing 12-15 on e85 tells me to go ahead and get some 120lb injectors at least. The dual pump set ups are foreign to me. I have read and read about them. If i can just get mid 600's max I'd be happy. Its a gen 2 cast vs racing 7875. Not sure how high in power that will go. I'm kind of understanding I need to just bite the bullet get some big injectors and the line pump kit from like Racetronix. I was hoping to speed 400 on a pump not 1000. Then also a regulator up close to the line. Even at 600 I think I'd so 120 injectors and try to get away with like a 450 or 495 pump id hope, but I'm starting to think that's a dream.
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You don't NEED to go E85 for mid 600whp range. I have 60lb injectors with a single 450, adjustable regulator and did a hotwire kit. That setup will do 700whp at least and that's before you add in the water/meth injection.
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Verdad Gallardo That was discussed in a recent thread. Really at that power range your tune has a better chance of killing the motor than the octane itself. 93 plus water/meth is plenty safe at 650 if you don't get greedy with timing. You can go E85, I'm just saying that for that power level you have another option to safe some cash.
I was looking at the snow meth kits also stage on it's pretty cheap, and where I work washer solvent is free. The tune will be good. I have Vengeance tune my car in the past and been very happy with it.
If you don't do your own tuning I would ask the tuner what fuel they prefer for your goals.
I'd like to learn, but have never done it before. Not sure if a boosted application is the right place to try to learn. HP tuners had a free hour class not too long ago, and talked about what you need to get to do the tuning it wasn't too bad. It seemed like a lot of info and looked like rocket science, but that could be since I've never done it or even been in the system. It would be nice though so I could make changes to it with different mods and maps. I think they charge 650 for a dyno tune plus 200 if power adder is on. Its 250 to just take my ME out to them for a base line tune to start it safely. I could save money and learn i bet. Buy the equipment and the classes.
Last edited by Rainz/28; Feb 13, 2021 at 12:44 PM.
Staging Lane
Joined: Dec 2016
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That was discussed in a recent thread. Really at that power range your tune has a better chance of killing the motor than the octane itself. 93 plus water/meth is plenty safe at 650 if you don't get greedy with timing. You can go E85, I'm just saying that for that power level you have another option to safe some cash.
Staging Lane
Joined: Dec 2016
Posts: 82
Likes: 3
around here we have 91 octane premium from QT. But the 93 octane from Jump Start has 30% ethanol mixed in. Just curious. Thnx
