Pump or e85?
Pump or e85? I am trying to get the best results and have e85 available but not sure if its right for my combo. I want to be able to run max boost on this setup, it will have some street and some track duty
1972 nova
5.3 w/ rod bolts
ls6 cam
317 heads with ls6 springs and gm mls gaskets
ls1 car intake
w body manifolds and 2.5 crossover
mp t76 1.0 ar q trim turbo
50mm wg and bov
th400 w brake
28" tall tire
3.23 gear
I have 10 feed fuel and 83lb injectos and eleminator a1000
Trying to get opinions whether I should run pump or e85. I really rather not pick up 243 heads, I do have truck heads but would need to send out and get checked out.
want to make low to mid 600 whp
1972 nova
5.3 w/ rod bolts
ls6 cam
317 heads with ls6 springs and gm mls gaskets
ls1 car intake
w body manifolds and 2.5 crossover
mp t76 1.0 ar q trim turbo
50mm wg and bov
th400 w brake
28" tall tire
3.23 gear
I have 10 feed fuel and 83lb injectos and eleminator a1000
Trying to get opinions whether I should run pump or e85. I really rather not pick up 243 heads, I do have truck heads but would need to send out and get checked out.
want to make low to mid 600 whp
like said above, absolutely no reason to not run it if you have the fuel system to support it and have it locally
80's are on the smaller side
My friends BMW w/ a 5.3L 317 heads and a MPT70 with the bigger A/R housing is a little laggy, it is a 6 speed though... We went with the 317 heads because we were going to run it on gasoline. Now its on E85 I wish we would have left the 5.3 heads on it.... it would be way more responsive.
TECH Apprentice
Joined: Aug 2006
Posts: 366
Likes: 0
9:1 here with E85, don't believe the "laggy" claims, when tuned correctly E85 is far superior to 93 petrol. Just make sure those injectors are big enough. I run 200lb High "Z's" my 82's weren't enough for my setup but they aren't cheap... just an FYI
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Depending on actual volume of fuel, the pumps should be fine. Where E85 tends to cause issues is that people dont "plan" for it, and it becomes a hassle.
When you size your fuel lines, spec your pumps, and find the injectors you need to flow 30% more fuel, E85 is absolutely great.
Its when you build a car, realize pump gas sucks, race gas is expensive, E85 is super cheap and makes the same power as C16. At that point when you want to switch, youre stuck if you dont have the right parts or the cash to upgrade.
On turbo cars, E85 will spool earlier due to the increase in exhaust volume.
When you size your fuel lines, spec your pumps, and find the injectors you need to flow 30% more fuel, E85 is absolutely great.
Its when you build a car, realize pump gas sucks, race gas is expensive, E85 is super cheap and makes the same power as C16. At that point when you want to switch, youre stuck if you dont have the right parts or the cash to upgrade.
On turbo cars, E85 will spool earlier due to the increase in exhaust volume.
Depending on actual volume of fuel, the pumps should be fine. Where E85 tends to cause issues is that people dont "plan" for it, and it becomes a hassle.
When you size your fuel lines, spec your pumps, and find the injectors you need to flow 30% more fuel, E85 is absolutely great.
Its when you build a car, realize pump gas sucks, race gas is expensive, E85 is super cheap and makes the same power as C16. At that point when you want to switch, youre stuck if you dont have the right parts or the cash to upgrade.
On turbo cars, E85 will spool earlier due to the increase in exhaust volume.
When you size your fuel lines, spec your pumps, and find the injectors you need to flow 30% more fuel, E85 is absolutely great.
Its when you build a car, realize pump gas sucks, race gas is expensive, E85 is super cheap and makes the same power as C16. At that point when you want to switch, youre stuck if you dont have the right parts or the cash to upgrade.
On turbo cars, E85 will spool earlier due to the increase in exhaust volume.
This thread came around at a good time for me as I'm putting together the final gameplan on my turbo 5.3 build.
Here's my dilemma - while there are E85 stations "around" my house, there's only two within a 15 mile radius. Fine, whatever, I can probably manage going out of my way for a gas top off...I'm worried about the occasional road trip and having to rely on the ability to find E85.
Secondly, what you all discussed about 317's on a 5.3 has me second guessing my head choice. To be honest, most of my driving is and will be cruising around town and not winding the motor up to 6500 RPM - even with "just" a 12 second car, it would only take a few seconds to be well above the speed limit. If the lower 8.xx:1 compression ratio makes it a little weak until you hit boost, that may take away some of the enjoyment from idle - 4k fun.
So now I have two questions - how big would I have to go on injector size with a goal of 600 RWHP on e85? If I went e85 + 243 heads, would the power band be worthwhile to deal with the extra cost of 243's over 317's + hassle of finding e85 stations?
My initial intent was to be able to run 91 octane and no methanol and still make good power safely.
**also, I'm currently planning to use a Master Power T70 .96 A/R - Upon looking at the specs on Master Power's site, it looks like they rate them at 700 max HP, so 600 RWHP would probably be pushing it to it's limits I imagine?
Thanks!
Here's my dilemma - while there are E85 stations "around" my house, there's only two within a 15 mile radius. Fine, whatever, I can probably manage going out of my way for a gas top off...I'm worried about the occasional road trip and having to rely on the ability to find E85.
Secondly, what you all discussed about 317's on a 5.3 has me second guessing my head choice. To be honest, most of my driving is and will be cruising around town and not winding the motor up to 6500 RPM - even with "just" a 12 second car, it would only take a few seconds to be well above the speed limit. If the lower 8.xx:1 compression ratio makes it a little weak until you hit boost, that may take away some of the enjoyment from idle - 4k fun.
So now I have two questions - how big would I have to go on injector size with a goal of 600 RWHP on e85? If I went e85 + 243 heads, would the power band be worthwhile to deal with the extra cost of 243's over 317's + hassle of finding e85 stations?
My initial intent was to be able to run 91 octane and no methanol and still make good power safely.
**also, I'm currently planning to use a Master Power T70 .96 A/R - Upon looking at the specs on Master Power's site, it looks like they rate them at 700 max HP, so 600 RWHP would probably be pushing it to it's limits I imagine?
Thanks!
Last edited by evo462; Dec 13, 2010 at 06:12 PM.
You could just mill the 317s down which would make them the same as 243s essentially.
600rwhp has been done on 60s with a good pump setup behind it. 80s would be better though.
600rwhp has been done on 60s with a good pump setup behind it. 80s would be better though.
(sorry for the thread hijack) not sure what the machining costs would be involved with that, but if it costs too much it'd approach the cost of 243's anyway.
Just run some stock 5.3 heads if you are only wanting 600rwhp and go with a 76 or 78 turbo.