I have read some people doing bolt ons without a tune being fine, i have also read people doing boltons without a tune and their car runs like ****.

now what i am wondering is what kind of boltons can one do without getting a tune? And which ones require the tune? I would like to do some boltons but almost everytime i read someone doing a tune they always need to bump up the octance which i really dont feel like doing (well over $5.00 a gallon in canada) and the compression on our motors really isnt that high so 91 octane should be more then enough if your not messing with more compression.

So what mods can be done and work succesfully on my car without needing a tune? CAI, exhuast?

 

def better with a tune and u get more whp out of it...i dont have a tune and a cell comes and go all the time in my car

 

you should be fine with a CAI and an catback without having to get a little bit of a tune. but once you start getting into a header and downpipe, injectors, and the such you won't really gain anything without the tune. hell you could tune your car stock and get a bunch of hp out of it.

 

yes more hp with more octane right? lol

 

yeah as far as driveablity and reliablity you can run the stock tune and bolt ons and be fine, but like (outtamymind) stated you can put a custom tune on a stock vehicle and get improvements, most cars are detuned from the factory to be more fuel efficient and for reliablity reasons.. another reason being is the your location.. most cars are tuned for 3000 feet elevation above sea level and 70 degree air temp.. So if you get a tune for where you live say for example at 500 feet above sea level then the air is cooler more dense so your fuel table can be up so you can benefit from the thicker air.

Yes 93 does not autoignite( igniting prematurely) like 87 does in a higher compression engine. I have noticed that my car gets better fuel mileage and has more power with 93.. plus its just alittle over 2 bucks more to fill up with 93...so why not..lol

 

ya i'm up to 89 right now. just started a p/t job so i'll be moving on up the scales up to 91. that and i'm getting all my stuff together to get tuned. so it will work in my advantage to tune for 91 but for now 89 is working great.

 

putting a higher octane than your car is tuned for will mess with your timing and actually hurt performance. to my understanding its actually harder for your car to burn higher octane gas than it was tunned for

 

You don't always have to up the octane level. If you tell the tuner that you want to run 91 octane, they'll just adjust the tune.

 

ya and 89 will run the 2.4's fine stock with plenty of power. 87 is so so, you get a bit of a knock sometimes though

 

Originally Posted by Chuck View Post
yeah as far as driveablity and reliablity you can run the stock tune and bolt ons and be fine, but like (outtamymind) stated you can put a custom tune on a stock vehicle and get improvements, most cars are detuned from the factory to be more fuel efficient and for reliablity reasons.. another reason being is the your location.. most cars are tuned for 3000 feet elevation above sea level and 70 degree air temp.. So if you get a tune for where you live say for example at 500 feet above sea level then the air is cooler more dense so your fuel table can be up so you can benefit from the thicker air.



Yes 93 does not autoignite( igniting prematurely) like 87 does in a higher compression engine. I have noticed that my car gets better fuel mileage and has more power with 93.. plus its just alittle over 2 bucks more to fill up with 93...so why not..lol


The top paragraph is answering one question...and the bottom paragraph is answering the one about 93 octane.. The manual recommends 91 octane or higher... so 93 is not to high from the stock tune, because the 2.4 has variable valve timing when running a lesser octane fuel the timing is retarded.. when running a higher octane fuel "91 or better" the timing is advanced.. But...yes with a custom tune I would use the octane it was tuned for..

 

i already run 91 octane, 93 octane i dont see at many gas stations, most their highest is 91 octane. Thats why when i get it tuned i would like to stick with 91 octane and no higher. Is it possible to get a good tune with boltons and still sport 91 octane? 10:4 compression isnt that high of a compression, thats why im surprised it needs so high.

also do add to the altitude, for tuning my car for the altitude here, would that benefit in performance AND fuel economy? At mission where i race at, its at sea level, and where i live, im 49ft above sea level, so im pretty low elevation here.

 

yeah... 91 octane is good its what is recommended by GM..yes a tune for your correct altitude will help with fuel economy... but if your going to just do a cat-back and cold air intake then a tune is not needed and you will see better mileage with just bolt-ons.. I picked up 2 MPG better fuel mileage with a custom cat-back and a K&N airfilter..

you may also want to check into lightweight pulleys and using Mobil 1 full syn 0w-30 oil..

 

i really think that the highflow cats/ cat deletes are the problem.

Also all we have here is 93 and i run perfectly.

 

0w-30? not too thin? im using 5w-30 mobil 1.

also what light weight pulley's u speak of. This is the first tuner type car i have had, i used to own a jeep liberty lol.


Im thinkin next year either a full exhuast or a cat back and a CAI

 

http://www.mobiloil.com/USA-English/...l_1_0W-30.aspx

Nope mobil says you can run this stuff in any engine that recommends 5w-30..Especially since you are in a colder climate...It meets and exceeds manufacturers recommendations!!

They make a crank pulley and a alt. pulley for the LE5..
http://www.jbodyperformance.com/new/...edline&genId=4

 

interesting i didn't even realize that made aftermarket pulley's for the 2.4. nice to know

 

i ran with intake and exhaust for a while with no issues.