I was wondering the horsepower difference with a tune on 87 octane versus if I got a tune with 93 octane and advanced timing?

 

I really wouldn't think it'll be that much. Depends if your stock or have at least all the bolt ons you can put on the car.

 

I do have most the bolt ons. CAI, header, cat-back exhaust.

 

perhaps an explanation would help here.....

basically your car operates between the low octane and high octane settings. Your ride starts up using high octane settings, and steps down towards the low octane settings until it finds the sweet spot.

but to answer your question, it's dependent on a car to car basis. my general rule of thumb is NA 4 bangers with full bolt on's will gain 6-15hp when combined with the premium fuel tune. my cobalt without bolton's gained a lil over 4hp, some tq, and made driveability much sportier. with each bolt on, the more a tune can compliment the ride.

i don't apply that rule of thumb to just ecotec's either.

 

i Like to stick the rule of thumb in my ass.

 

i'm so sure you do..... lol

you got to the Towers lot car shows Dark? I used to live down in Coral Springs.

 

If and when I get tuned, I may ask Trifecta to tune for 87. I'm only going to be running bolt on's, so the difference in performance will be negligable. Even if its 5whp, the money I'll be saving at the pump will be worth the sacrifice.

 

uhhhhhh, you get tuned for 93 and if you run 87 the computer will dial ignition back to match the lesser grade fuel, basically. don't get a half-assed tune dude. oh yeah, the difference is most diffinitely noticeable.

 

im sure i would go kaboom if i ran 87 on my 2.2...

 

The only way the ECU senses it needs to retard the timing is through the knock sensor...If you tune for 93 and always fill up with 87 you will be knocking every single time you start your car or go WOT. Russian Roulette. This is assuming the tune is aggressive enough to even cause the knock. Just talk to your tuner about it. It's going to cost just as much for 87 vs 93, so he will only give you the answer based on what's best for your car with his exact tune.

 

tune and runnign on prem my car gained 11hp

 

hmm this is very interseting.....bc im getting a tune very soon here so while data logigng is taking place and i drive with 93 and get the tune intsalled and then start dirving with say 87 there would be a bad knock? sounds like to if if u tune with 93 run 93 if you tune with 87 you can use 93 what about a tune on 91 then using 87 or 93 ....? hmmmm i bet the knock would not be as bad....

 

once tuned you can run whatever tuned for and lower to 87. it will just pull lots of timing until you are a ok to run

 

hmm so if i tuned with 93 then ran 87 and bit and then jumped up to 93 again would it be the same as before???

 

should be ya...

 

interesting...

 

When the tune changes to accomodate lower octane gas, the ONLY thing that changes is timing. due to the knock sensor increasing KR. If you are going to run 87 most of the time, GET AN 87 TUNE! If you get a 93 tune and run 87 most of the time, you will be making less on 87 than you could with AN 87 TUNE. On top of that, you will be having detonation issues consistently, in certain circumstances. Get the tune for the highest octane you will be running on a regular basis.

 

Listen to spanky. Get tuned for 93, and put 93, its 2 bucks for for 10 gallons. My old 2.2 was pretty fast with my full bolt ons, intake mani, and tune.