I'm about to put my new badmab headers on (thanks guys for the info on them!) and I'm wondering how long I can go withou a tune? I have a catless downpipe on now and I'm already burning rich. I don't wanna Burt the car or know if I will. any help please!

 

You won't hurt the car without tuning for exhaust mods, but your fuel trims will be off. This isn't a big issue because our ecu will compensate for the fuel by adding or subtracting fuel depending on the conditions.

Obviously if you want the most out of your car, you should get it tuned though!

 

Definately threw trims off when i added my Bad Mab. Got the fuel trims in line though and its pulling strong.

 

x2 Getting the header/downpipe does not require a tune as your car will still run fine. However like others have said to get the most out of those mods you should tune afterwards.

 

Car will pull strong whether or not you have the fuel trims in line as they are not used at wide open throttle . Fuel trims are used for cruising and idle.

 

alright sweet thanks!!

 

Was just saying it threw off trims a good amount. It was more of a enjoyment statement that its pulling strong with the bad mab on it.

 

For sure man, any time we change the way air flows or how much we are flowing / not flowing the fuel trims will change and I am glad that you lowered your 60-100 times, good for you man!

 

Just to make sure, there is no tune needed after adding a header? Only optional to get the most gains correct? What will throwing the fuel trims affect?

 

Will it throw MPG and maybe idle

 

This.

I also run the badmab header, and the car is running great!

 

Staged 07, who did your tuning? I will probably be looking to get tuned sometime this summer and if I remember correctly you are pretty close to me.

 

I run the GMR Stage 3 PCM + Trifecta.

 

i sit here and think wtf. lol with any changes to a car that is using a fuel injection system that uses mainly maf or only maf shiz will change so therefore to get your power for your aftermarket, it needs tuned. With a speed density system its not as bad but still needs to be tuned. So with me saying this if th OP doesnt get his car tuned for his badmab header it will create shitty fuel trims and learn them. So if say he goes out of state where the elevation is different, temps change , he will get random kr, lose mpg, ect. So yes tune it.

 

Alright haha so let me get this straight, bc i have heard a lot of different things from different people. Here's what I'm planning on doing. I already have a 3" exhaust, I'm planning on adding the bad mab and a 3" downpipe. Will this affect my car negatively? Say I dont get tuned for a while, will it really matter?

 

You will be fine man.

You will get some people that are a little nutty with tuning that may say other wise, but your car will be fine. You just wont see the full benefit of your exhaust mods until you get tuned.

 

Alright thanks, that is what I was hoping for

 

No prob. You will still experience a nice bump in power un-tuned. The LSJ responds well to exhaust mods

 

u can put the parts parts on and wack fuel trims. but if you read my previous post itll affect it mainly on changes in temps and altitude ect. u will throw a code at most and possibly kr.......

 

I understand all of that (no need to explain to me), but if you monitor the car you will be fine until you can get it tuned. Don't be making it seem like if you bolt a part on the car it will throw it so far off that it will cause damage. While that can be possible (depending on mods) it is very rare. I agree temps & elevation can alter a tune, but if you have to worry about adjusting for that constantly you have a problem. The elevations change so often where I live that worrying about my tune that much would be just plain nutty. I live in the mountains & my girlfriend lives in the valley, my tune adjusts for this when I drive to her town, but to try and have it spot on 100% of the time is unrealistic. Bolt ons, especially on the exhaust side, will be adjusted for in the tune. Yes, fuel trims will be thrown off, but as long as they don't exceed around +15/-15 (this will usually set a lean/rich code) they will be well within the limits of the tune, and will be fine until one can get tuned.

 

staged you know i wouldnt question u lol usually we are both right and we are here, im just saying if he is off say - +10 ect it can compensate but it can throw a code and some other issues. ecspecially if anything changes on driveing.

 

Agreed!!

 

um actually... The car does use the fuel trims in pe mode, it just cant change them. This is why you can tune for e85 and then run a tank of 93 in an emergency without the car going retardedly rich in pe mode (of course you'd still have KR due to the reduced octane in you tuned your timing). As long as you've run the car for a while in closed loop for the fuel trims to come in line then a mod like this shouldn't change your pe afr (actual).