I am just trying to figure something out. If your car is STOCK, or if you are modded and tuned for Pumpgas ONLY, DUMPING any form of racegas in your tank is a total waste of money UNLESS YOU ARE TUNED FOR IT?

I Read somewhere that if you dump racegas in your tank, it is like a "Magic" 40 AWHP gain over pumpgas, even without a tune.

Some people say unless you "tweak this and that", pull timing, lean it out, etc... while running on Racegas, it will ACTUALLY COST you HP, and slow you down. (Not to mention wasting money on it). I was guilty of going to the local dragstrip, and thought If I just dump in this racegas, I am automatically going up in HP, and down on E.T.'s. (back in '03 I thought this) Apparently this is a falsehood? You gain HP on the dyno while on racegas, BECAUSE you are tuning for it and doing the "tweaking" then and there.

So after all that, my question is this:

1. Will racegas alone give you gains in HP, just by dumping it in the tank?
Lets say........in a stock trim car?

I bring this up, as I was at the local dragstrip Friday, and I heard some kids talking about the gains they get JUST by dumping in racegas without tuning for it.

 

I read on this forum, that a couple of members claimed, that adding 100 octane + alone actually gave them an additional 20 whp. That's a bold claim. I'm not sold on that.

With high octane fuel and no tuning, a stock ECU equipped Evo should run at it's
most efficient. Meaning more knock resistance , more timing advance, slightly
leaner. Enabling said Evo to run on the more aggressive MAPS. Less aggressive MAPS( lower octane fuel ) vs the more aggressive MAPS ( high octane fuel ) is where it might be possible to see a gain in horsepower, thus performance.

Now properly tuning for a higher octane ( if not on the ragged edge ) , yes
you will definetly see gains. That's the beauty of high octane, it allows
for a more aggressive tune.

It's great being an Evo owner these days with all the choices for engine management. Plus all the logging software , widebands, egt monitors, etc.

 

Great post, thanks for that!

 

The Race gas allows for higher timing without having detonation "knock" due to the higher octance rating on the fuel. You need to lean the AFR's out since the burn rate of the fuel is slower (something like this) and then increase timing.

 

i out 114 in my car befor and feelt the same if not slower.

 

That was what I was getting at. Dump racegas in, and you NOT leaning it out, or backing off/advancing timing (no clue which), would mean you wasted your money on that 5 gallon drum of VP, no? In effect, don't buy racegas, unless you have a map for it,or are tuned on it. I know the burn characteristics are different with race/pump gas. You are correct.

Also, if you are tuned on 110 LEADED, you have to STAY with that gas. You can't jump from 110 Leaded, to C-16 and get the same burn characteristics. What you tune on, you STAY ON. (I think) Thanks for your reply also!

 

My personal "Butt dyno" would have to agree. I did the same on my car...........way back in '03. I just don't want the noob's to think this is a "Magic ellixr" and instant HP gains. Look at the cost/hp gains first. Tune it, and you are fine. (My opinion)

 

i might be wrong b ut putting 100+ oct in your tank dose nothing. BUT it able's you to rase the boost up alot. so the added power come's from upping the boost. you do not need a tune for 100+ oct. its best to have one. but you can make 25+hp by putting in 100oct and upping the boost. you can make more being tuned on it. just adding 100oct dose nothing at all.

i beleave this statment is 100% right. not sure though

 

Race gas works best with lots of timing advance and lots of boost. If you have some sort of boost controller, you can dumb in the race gas, crank up the boost, and get some good power gains

 

Makes sence evodan, just how is intriguing. I might need more coffee to figure that out. How dumping it in your tank, and not tuning for it, can give lots more boost.

 

Thanks Silk, I wont go make that coffee afterall, I get it now. (Except the timing advance deal)

 

It depends on your state of tune and type of car

Evos have reactive ignition timing knock control ergo: if the car is presently running timing retard from knock adding race gas (with the same boost level) will make additional power as the timing will revert to the tikming values in the stock ecu

if the car is not presently pulling timing then adding race fuel may actually cost you a few whp

Other kinds of cars with adaptive igition timing (e.g. Subaru are more able to react to the introduction of a higher octane fuel)

In conclusion, when answering this question you have to know what kind of car you are talking about and how it is tuned

 

smoked heya friend whats up?
if your using 91oct on a stock evo and then dump racegas youll feel the difference you will gain the power lost from using 91oct.
know if you tune your car with 100oct i in my case use vp109 i advance timing and lean it out and turn up the boost using dataloglab i have seen and increase of up to 41whp over my locally 91oct tune

 

You're welcome.

 

Thanks Al, and my friend from Honduras (Long time no see) I am not talking about my setup at all here. I was doing this in '03 when I got the car, dumping in racegas without tuning, didn't feel a whole lot different, just smelled different. Al explains how it works, and I understand it now. You just hear BOTH sides of the story at the track: "Great gains" to "Slows you down". Just thought I would pose this question to my "think-tank" which would be you guys! You make me smarter every day!