Headers & exhaust

[L67boostMonte]

I added headers and 3 in exhaust but lost a 1/2 sec at the track! I am still running a 3.4 pulley would like to drop to the 3.2 which I have and find someone to tune it, any help?? 13.7...added full exhaust...14.1X all day :bash:

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[syP]

so you put on headers and a 3" exhaust and you ran slower?



what were you trap speeds on both runs.. before and after

 

[L67boostMonte]

[email protected] to [email protected] 4 times in a row I added 18'' 077 eagles and other than that it was humid as hell right before a thunderstorm and got rained out but I still expected a gain even without a tune or at least run 13.7 again

 

[Mook]

humidity will kill the car. plus the added weight of the rims..unless those rims weight less than stock

 

[syP]

18"..


very doubtful

 

[Mook]

its still extra weight

 

[syP]

newb.. you said "unless they weigh the same as stock"


and i said.. 18" doubtful.. they weigh MOAR

 

[Mook]

oh. misread. NOOB

 

[L67boostMonte]

Dont know exact specs but they are slighty heavier than stock...so we know the tires and humidity hurts but what about this tune?? Anyone know anyone that wants to make some money??

 

[SRT41320]

i doubt its the wheel tire combo - the header, axhaust combo i prolly just a bad setup and killin your topend! happens to v8 all the time - anyone else runnin that same setup that you know of?

 

[greasy]

I added headers and 3 in exhaust but lost a 1/2 sec at the track! I am still running a 3.4 pulley would like to drop to the 3.2 which I have and find someone to tune it, any help?? 13.7...added full exhaust...14.1X all day :bash:

What kind of car do you have? Is it 3" piping all of the way back?? It sounds like you don't have enough back pressure because the 3" piping is just too free flowing for what you have done.

 

[MIKES3]

I added headers and 3 in exhaust but lost a 1/2 sec at the track! I am still running a 3.4 pulley would like to drop to the 3.2 which I have and find someone to tune it, any help?? 13.7...added full exhaust...14.1X all day :bash:

What kind of car do you have? Is it 3" piping all of the way back?? It sounds like you don't have enough back pressure because the 3" piping is just too free flowing for what you have done.

I have to come to an agreement as to what he said. Once you put Headers on a car witha 3.4 pulley and open your exhaust your are pushing more air out than in. You going to need to drop pulley sizes to get your gains off of the line. The headers are going to be worthy up top. As for the 3" exhaust. Got DAM!!! Thats to big in my opinion. 2.5" is the way to go. You dont even really need to do that type of exhaust wrk to get better gains out of our cars. The only thing that does is add more drone. I'm willing to bet you dropped about 2-3lbs in boost and thats why your seeing a loss.

As far as a tune goes all you need to do is add fuel and adjust the MAF a bit. Its not that big of a deal to tune a car that went from a 3.4 to a 3.2 pulley. Depending on your KR you may need to pull back a tad bit of timing, but thats also normal.

 

[Mook]

i had a 2.5in exhaust on my grand prix and i never thought of going 3in...on a turbo car its a different story

 

[syP]

and you are confident you will be my cobalt when you are running 14.1's ?

 

[L67boostMonte]

I did 3'' for future mods and figured if I am doing the exhaust might as well do it big then...and the 1/4 mile times mean squat on the street for how close our times are unless we are racing exactly a 1/4 mile??? You run 13.8's right syP? You run the balt for $$$??

Mike- what have you done to your gp?

 

[Mook]

i'm willing to bet the 3in is hurting you

 

[L67boostMonte]

I agree, with the current setup it is holding me back

 

[Mook]

well what do u have planned? i still think 3in is overkill on the prixs, unless ure going turbo. the 2.5 was more than enough for the whipple

hell, the difference between 3in and 2.5 on the srt is only noticeable after 400whp


you probably have some decent top end tho...more than likely losing some low end torque for now

 

[syP]

RAN 13.8s... hahahaha


i dont stay at the same mod level for very long.. i like to add more which i have

 

[L67boostMonte]

ok so I assume you wont disclose your latest 1/4 time?? If so...I will only race you for money then, only makes it fair

 

[syP]

i dont go to the track.. as i live 1 hour and 30 min away from it.


i have been there once in my SS.. and you were tehre.

dont have time for that shit.. i work too much.. all i am going to tell you is that you need to have smaller than a 3.4" on there and trap over 107mph to beat me..

 

[L67boostMonte]

and all I am goin to tell you is you will need to get a faster car to beat me....dont worry I got you :booty:

 

[syP]

fix your exhaust first (header problem)... then come get me.. i dont wanna waste the gas.


and throw a fucken resonator on that thing too... never heard a car that sounded that shitty in my whole life.. and thats coming from a 4cyl (me)

 

[L67boostMonte]

there is no header problem and lets run em for $100

 

[syP]

there is no problem but you ran a 14.1 after modding it more.. (hence this thread)


again.. fix it then we race.