hey guys im new to the turbo 4-banger scene and the EVO is my first car to start that reputation! nEway, i had just broken in the motor and wanting to take it to the 1/4 mile. thing is, i wanna run 100 octane (only for the track) to get good ET's...will 100 octane ruin my motor? feedback is greatly appreciated.

 

you will run worst times.
My advise is to get a MBC and run 20 psi straight down the track on pump gas. Without being tuned 100 octane will slow you down.

 

thanks.....hey one more question........to my understanding of reading about upgrades on this site, if i were to put an aftermarket intake system, i would need a tune for optimal performance gain from that upgrade, correct? and if i just put an intake system with no tune, i will lose power?.........correct me if im wrong...........and will only a k&n filter element make me gain nEthing?

 

A K&N panel filter will give 3-4whp (est.) and won't require a retune. Your best bet would be to not worry about the intake at all and only concentrate on the mods that give the most bang for your buck: mbc+gauge, flash (or other tune), and exhaust.

 

i wont say that as i know DSM are made so if you have higher oct. gas it can see that and it will actolly make car faster. but yes it is ture with out tune for it will not make 100% out of the 100oct. but you will see a diff from 93 to 100. and also he has a 05 evo meaning he is runing 21psi and fads down. so mbc not need there aswell

 

Terribly wrong, Mike. Please refrain in the future.

Stock boost on the 05 is a 20.3psi spike that tapers to 17.3. The MBC will allow him to raise it to 21psi and hold steady until 7k at which point it will taper, but not as low as 17.3.

Also, the factory tune is very rich, so without away to raise boost or lean out the AFRs, 100oct is not really useful. It may have an affect in that the ECU might adjust the mid-range timing, but it's not really worth the cost while stock.

 

hehe i want to see a log of a stock 05 then with that boost. and oct has nothing to do with AF as what i was told it has only to do with timing. so maybe the person who i ask just does not know. i hate wrong info.

 

Timing is a result of AFRs and knock count when relying on the stock ECU maps. Since we run so rich from the factory, then timing is already fully advanced. People like myself add race gas at the track, because we have our cars tuned to the edge and are running much more boost, which means we would encounter knock along with pulled timing if not for race gas. So yes, your hearsay is correct, but you just don't understand how it all ties together, because you're just repeating what you were told by someone else. In stock form, there is no knock and no lack of timing. The only place we run lean from the factory is at peak torque from 3000-4500rpm or so. After that, we go rich as hell. So, race gas would eliminate any potential knock in the mid-range, which would allow for better timing there, but it wouldn't be of help above 4500 - we stay above 5500 at the drag strip.

 

mbc+gauge......sounds like a good start....one thing i've always wondered tho....mite sound dumb but, boost gauges show either the -30vac to +30psi or the -1.0vac to +2.0 or 3.0psi........would that mean that if the boost gauge were to read 1.5 at max, would that be considered 15psi?

 

I wish somone would run their bone stock evo on pump gas at the track. Then next time out or whatever, dump in VP Performance Unleaded(100 oct). I really find it hard to believe your times wouldn't improve.

 

100 octane is great for the car, there is no problem running it, i run it in mine all the time, just to play around and it works great

 

No, 1.5bar is ~21.75psi. Search for psi to bar converter, and you'll see what I mean.

 

100oct _is_ great for the car, but with no mods to take advantage of it, the stock richness that our ECU provides under full boost does not allow for much to be gained. Did you not read my above explanation(s)?

 

well i thought there are people out there seting some nice recored on stock evos 05 that is and runing with race gas so i dont know. and warrtalon what is rich i thought evos should be runing rich lol all the tunes i see are still runing the car rich. what do you run yours at any logs plz

 

i dont understand why people think just dumping in race gas is gonna make your car run faster. Well its not, its gotta be tuned for it otherwise your just gonna run pig rich.