ThA5oLuTiOn

Has anybody done a test with race gas vs pump on stock motors? My car is currently on pump gas but is only a track car not driven on the street but It's on stock compression. If anyone has seen gains from just switching gas please let me know, Thank you.

Again completely stock motors or with bolt ons will be good too and a graph will be perfect. If this been covered before, please give me a link to it and this thread can be deleted.

ThA5oLuTiOn

Wow 147 views and no one has done this simple test. I'll guess I'll find out the hard way.

JuggerNaut-CTR

Seems like a waste of money to go and dyno a stock motor, switch to race gas and pay money for a dyno tune to see a 1-5hp difference.

scmil95eg

No one has replied because no one wants to explain what octane means or does for the eleventy-billionth time. Unless you've increased your compression ratio, increasing the octane of your fuel isn't going to help anything. You're going to sacrifice HP for increased knock resistance you didn't need in the first place. Great idea!!!

0mtber

iTrader: (2)

If you simply add race gas or a higher octane fuel then your vehicle is tuned for you will actually make less power then if you were running the octane fuel your vehicle is tuned for.

Using higher octane i.e. 110 & having the car tuned when using a stock engine setup isn't going to yield a ton of power over using 91-93 octane.

You would be better off tuning on meth injection to cool intake temperatures.

FlewByU352

John what about the switch between 93 octane and E85? Supposedly 200 degree cylinder temp reduction and higher octane means more timing?

ThA5oLuTiOn

For some of you guys thank you for the inputs, A dyno its not a problem neither is my tuner so therefor coming out my pocket It's not the issue. It's a simple test and it should be fun, I've only seen very good gains on E85 but the problem with that is, I have no E85 locally. I'm currently running 93 pump, and wanted to do a test against c12, Q16 and of course get it retune with each selection of gas.

0mtber

iTrader: (2)

Yes, you could squeeze more power out of e85 because of the cooling effects.

ThA5oLuTiOn

I think I'm going to take a 20min drive just for E85 before racing, Thank you "mtber".

0mtber

iTrader: (2)

No problem. FYI you can't simply add e85 to the car & drive it.
It must be tuned for e85. You must have the correct fuel system in place for e85 too.
(Larger injectors, fuel pump etc)

FlewByU352

Can you dual tune with a Hondata S300 to have both E85 and 93 octane tunes switched over via a toggle switch?

0mtber

iTrader: (2)

Yes. I would not recommend doing this unless you have a wideband gauge permanently installed to be 100% sure everything is functioning the way it should.

egb18c5

i think everyone should have one regardless lol

FlewByU352

I just bought a MTX-L for ya. I'm just buttoning up a few wires and finishing the custom Vibrant 3" exhaust then I'll be setting up an appointment and trailering the race car down to you. Hence why I asked if the dual tune via a toggle switch was possible. Run E85 at the track but keep 93 octane in it since ethanol is terrible with moisture absorbing when left for a little bit.

ThA5oLuTiOn

I have id's 1000cc injectors, walbro inline 255 fuel pump, Kpro, I deff know it will need retune. I'll have my turner take care of it, Thanx.

vtec8200

From tests that I have done running 25% VP c14+ with 75% 91 oct on cars me and my friend used only for the 1/8th mile track every week.

completely stripped 93 prelude with bone stock h22a did consistant 9.2-9.1 runs with the c14+ and consistant 9.4-9.5s runs with only 91 oct.

My 4 door 91 civic with d16z6 and comp 59300 cam no tune (only fpr) did consistant 9.5s runs with the c14+ mix and 9.8s with 91 oct.

This test was done with one 5gal can throughout the summer, we didn't always use race gas that's how we saw the different results. It was good for an average 0.2s on the 1/8th.