Dissapointed in Hamms and new exhaust

[BigKID]

Well I got my Hamm headers and true dual Magnaflows w/magnaflow x-pipe put on last friday and have been tring them out since then. They feel stronger in the mid range at part throttle but does not pull as hard at wot. It doesnt seem to be struggleing as hard to get the air out on the big end like it was but still just feels slow. Well I went to the track tonight and got the definitive verdict. My best time tonight was a 14.95@91.83. That is about .25 slower and 1 mph less than my normal times of around 14.7x@92.8x. Needless to say I was really disappointed and a little mad that I just spent 700 bucks to make my truck slower! :cussing: However I have noticed a horrible tick/tap around the back driverside of the engine. I think once I fix that it will be better and I am also going to try stock enging tunning since the 93 HPP tunning may be leaning me out a bit.

[HENRY]

Woah! Thats terrible!!

[FeatherFoot]

header installation leans out the engine and the computer needs time to adjust. 500 to 1000 miles of driving, but you should not have lost any performance. send me an email describing the exhaust. i.e. mufflers used, pipe size, crush or mandrel bends etc. etc.

We'll work the problem with you.

John

P.S. The rear bolt on the driver's side is a bi**h to get to, be sure it is tight.

FF

[CKTA]

Originally posted by BigKID
x-pipe

Hmmmmm:think: :think: :think: ;)

[FeatherFoot]

X-pipes usually help when the combining opening isn't full size. I have some for the race trucks that are 3" and have a 1-3/4 X 6" opening that work well but don't fit our trucks.

Dr. Gas has a smaller opening and are considered the `Standard'.

When an X-pipe is used, nearly all of the backpressure after it is lost when the opening is too big effectivly doubling the volume of the exhaust.

Remember that most of the stuff developed for race vehicles is developed for performance at higher RPMs that we will never see in our vehicles. What's good for the track doesn't necessarily work on the street.

FF

[CKTA]

Originally posted by FeatherFoot

Remember that most of the stuff developed for race vehicles is developed for performance at higher RPMs that we will never see in our vehicles. What's good for the track doesn't necessarily work on the street.



Thank you!:D

[TOPSECRET]

You need to keep in mind you can only pick up so much horse power before you start losing horse power. Unless you are building a race engine your motor isn't making enough power to utilize a truel dual exhaust. For a stock application that needs a little bit more power by doing a cat-back and some headers and lets just say air filter. a custom application has not been tested through R&D like some manufactures. I have Gibson exhaustv cat-back. it has been designed to work best on my vehicle not on all vehicles. You guy's with these universal mufflers are only picking up a fraction of the horse power you really could. Keep in mind back pressure is big factor in the new motors.
BIGKID. what is probally happening is your motor is leaning out top end because the computer is only going to dump so much feul into the motor, because it is designed to run best with the stock exhaust. Now what you can do is put a programer on the truck and this will help the computer adjuzt to the change and possibly pick up loss power. Truel dual on new trucks just sounds good doesn't perform good.