josh4ku

iTrader: (10)

Well I am building a 95% street turbo trans am. Build thread is here:5.3 L33 huron speed Turbo build thread!


The only pump gas that is available in the town I live in is 87. I really don't want to have to drive 30 miles every time to fuel up or stock my own 91 octane fuel. 91 is the highest available within 60+ miles. My questions is with 9.6:1 CR will 87 & methanol be ok to tune on up to so much boost after that just tune on 110 race fuel for race days?? Or will 87 not even be enough for cruising and mid throttle ?? If its absolutely stupid than i will just deal with it. I have a lot of money in this engine so I definitely don't want to be melting pistons because of fuel. My t4 turbo will probably max out at 800 rwhp I'm guessing. I would still like to run the car 600-700hp on the street.

JoeNova

You can cruise all day long on 87. You can run 87 and water/meth at a few pounds of boost and low timing but I wouldn't get greedy.

josh4ku

iTrader: (10)

I'll probably just drum 91. Race fuel isn't easy to get. E85 is 45 miles away but that's the only station I know of. So no trips on e85 for sure. Unless I habe 2 times 1 for e85 and the other for 91+ math. But that isn't the best because a small amount will always be mixed. Ugh stupid fuel

Forcefed86

iTrader: (4)

Don't think it's possible to get 600-700 at 9.6:1 on a factory build with 87 octane. I'd want 7.5-8:1 compression to try that. 4.8 crank and 61cc heads would be about right. Would be a total turd of boost though.

josh4ku

iTrader: (10)

I think what I'll do is have a street tune for 91 up to 10-12 boost. And also have a 110 octane tune . I'll just switch back and forth with hptuners. Is there anything wrong with that??

Forcefed86

iTrader: (4)

Nope... I'd consider running a 317 heads and LS9 head gaskets to drop compression a bit for pump gas.

josh4ku

iTrader: (10)

This is the build its forged, already have ls9 gaskets , but have already purchased PRC heads

https://ls1tech.com/forums/forced-induction/1744335-5-3-l33-huron-speed-turbo-build-thread-3.html#post18623031

farmington

iTrader: (14)

Any airports nearby?. AVgas has high octane.
What about buying a 55 gal drum of race gas and adding it to the 87 ?

ls3fox

id give the 87 with straight m1 meth a shot

customblackbird

iTrader: (2)

87 and pure meth could work but I'd be blowing through it and pure meth isn't cheap esp when you have to find a place that sells it lol. I wouldn't be trying to push too much boost and have a safe tune.

Why hey not get the chambers CNCd to get a few more CCs out of them to drop compression closer to 9:1. You can also valve cut the Pistons to take alittle out to drop compression.

for what it's worth water has the best detonation control compared to meth. You might be better running more water than meth to help the detonation more.

you could also run an IC to lower IAT temps as low as possible which will help. I run a FMIC and spray 750ml of 50/50 which everyone says is overkill for stock 5.3 compression with 93 pump gas and 12psi. But mine is on the street and **** gets warm lol. IATS without the IC and just meth were in the 140-160*F range. With the FMIC the IATS are in the 90-110 range without the meth.

a05c

Pure meth is only 400 and change for a 54Gal drum.

customblackbird

iTrader: (2)

haha only $400 and change! Thats like $7.50/gal at $400 even. But I guess if you use like 2-3 gallons a week that would be alot depending on how much you drive. So 54 gallons would last a while. Pure meth would really bump up the octane with the 87.

LS325ci

iTrader: (3)

your compression ratio is only .1 difference than stock 5.3, if im not mistaken they are 9.5
So I dont see a problem with this running 20psi.
My STOCK from factory runs that all day long.

as far as 87 is concern do a calculation of how much methanol you need for your powergoal, factor in the water for your nozzle calculation.

and tune away. I think you can get away with it(im actually planning the same think for my next build since im planning to take the car on trips and some towns only have 87)

just start low boost and crank it up slowly, you can monitor everything on hptuners. Tune as always is key, I payed for email tune and I gotta say im impressed on how well it drives for a mere $300 tune.

side note, if you have aftermarket heads, and I assume cams I dont think youll need 20 psi like i did to break 600whp.


As mention above I wouldnt do that for a DD, The cooling benifits of water is much needed if he wants to make that power.

also depends on the mix and nozzle. that seems like a lot of methanol a week though. I like the benefits of water for cooling so i run 50/50 like most. and as a DD I use up about 1.25 gallon PER TWO tanks of gas. i dont think ive used up 1.25 gallons in a week. I have a 14gph nozzle.

wow thats pricey, wonder how much they charge for shipping.
I assumed they also charge you for the drum cost. Which isnt cheap.
Ever tried looking for one locally? I didnt know we have a race gas place around here untill i was looking at other cheaper alternatives for boost juice.

Now I drive 10 minutes away and fill up my 5 gallon container for abour $3-4 a gallon.

Nali6.2

where the hell do you live where only 87 is available?? lol

LS325ci

iTrader: (3)

Ever take road trips? Youll encounter some rural area where the pump only has 87 and diesel.

customblackbird

iTrader: (2)

For what it's worth I've blown through about 1/2 gallon in 1 day injecting 750ml of 50/50. That was prob 2 hours of driving and some good long boost runs on the street. I could see blowing through 1 gallon a weekend if ur having fun with it.

ls3fox

i use about a gallon every 400 miles straight meth and i dont drive that car easy

Nitroused383

iTrader: (10)

I've never seen a place that only sells 87 octane. Get a 55 gallon barrel of e85 and run all the boost your heart desires.

LS325ci

iTrader: (3)

That's about what I use. I say this is average for a DD

I get around 200mi a tank so it's not like I'm driving easy.

LS325ci

iTrader: (3)

Yea if your out just wot everywhere, DD don't really see that much WOT, specially if your commute has majority freeway.

There's also nozzle size that people forget to factor in. Your usage will depends a lot on that and I'd say some spray too much at times without doing any sort of testing. I use to spray 20gph total and after some testing I saw no real difference beside having to fill up more. This is on a 20psi 91 octain tune

I'm down to 14gph, could probably cut some more but it's happy medium