HFC + TD exhaust = my car shuts off
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From: kuwait
here is a video clip of my mod ,
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/D50VXSiRny8&hl=en"></param><embed src="http://www.youtube.com/v/D50VXSiRny8&hl=en" type="application/x-shockwave-flash" width="425" height="344"></embed></object>
first tell me what you think about the sound of this comb ?
then guys you would here :
1) nice deep idle sound (although low idle ,thats what i`m working on
)
2) RASP at high rev ,too bad
(any idea`s how stop that rasp ,other than going turbo !!,someone talled me that it did work with him )
3) after revving up at the end of the clip you hear a high leak sound
that i was talking about ,strange thing its coming from the tips nothing in the pips but very very low leak sound in the HFC`s
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/D50VXSiRny8&hl=en"></param><embed src="http://www.youtube.com/v/D50VXSiRny8&hl=en" type="application/x-shockwave-flash" width="425" height="344"></embed></object>
first tell me what you think about the sound of this comb ?
then guys you would here :
1) nice deep idle sound (although low idle ,thats what i`m working on
)2) RASP at high rev ,too bad
(any idea`s how stop that rasp ,other than going turbo !!,someone talled me that it did work with him )3) after revving up at the end of the clip you hear a high leak sound
that i was talking about ,strange thing its coming from the tips nothing in the pips but very very low leak sound in the HFC`s
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Joined: Feb 2008
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From: kuwait
Can Any Body Agrea On That
i searched and i`v found this ,is it true that RASP is bouncing airflow ?? although its just a theory but somehow i find it more likely true
and out of the theory ,my thinking (go easy on me guys just saying theories )
P.S : smaller gaskets (2.5 exhaust with 2.25 gaskets) would that gives more RASP or less (regulating the airflow if it was bouncy) ,,or its bad idea ...period
too much Q`s and too much posts from me ,,,sorry guys
Originally Posted by vinnycuz
To my understanding, RASP comes from having to much air flow with not enough back pressure. So I am assuming if I went Twin Turbo or something to that effect than the pressure of the air would be much greater therefore stopping the RASP. If the force of the air going out the exhaust does not have enough pressure it does not shoot straight out but basically bounces around. If the force is greater and the air is pushed out more straight then it will not bounce and therefore prevent RASP. Is this theory sound?
P.S : smaller gaskets (2.5 exhaust with 2.25 gaskets) would that gives more RASP or less (regulating the airflow if it was bouncy) ,,or its bad idea ...period
too much Q`s and too much posts from me ,,,sorry guys
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From: kuwait
GOOD NEWS
i cleaned the throttle body and the MAF ,now the my Z idle is like a symphony
thanks all that was so helpful
still working on the Trq loss in low-end
no tire mark`s yet
(
at first i reset the ECU by unplugging the positive wire in my battery 
, now doing it the right way ,, negative , let us hope that would make a difference )
i cleaned the throttle body and the MAF ,now the my Z idle is like a symphony
thanks all that was so helpful
still working on the Trq loss in low-end
no tire mark`s yet (
at first i reset the ECU by unplugging the positive wire in my battery , now doing it the right way ,, negative , let us hope that would make a difference )
Last edited by Darkness75; Jun 21, 2008 at 12:30 PM.
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From: kuwait
did the reset of the ECU ,i gained some push-up power better than before (although they say its a short term gain)
looking forward for the 5/6" or 1/2 spacer what will do
wish me luck
looking forward for the 5/6" or 1/2 spacer what will do
wish me luck
Darkness,
To be honest, I've done a lot of dyno testing of exhausts. Single, Dual and True Duals. And not once did I see a loss of power anywhere on the curve.
If the exhaust system is poorly designed, then yes, it is possible to lose power but I don't know of any production exhaust system on the market that is that poorly designed.
Anything is possible with your car and its exhaust (it would need to be dynod to know for sure) but I suspect you arent losing any power at all. I say this because I have never seen it unless the exhaust system is really messed up.
Just my 2 cents.
To be honest, I've done a lot of dyno testing of exhausts. Single, Dual and True Duals. And not once did I see a loss of power anywhere on the curve.
If the exhaust system is poorly designed, then yes, it is possible to lose power but I don't know of any production exhaust system on the market that is that poorly designed.
Anything is possible with your car and its exhaust (it would need to be dynod to know for sure) but I suspect you arent losing any power at all. I say this because I have never seen it unless the exhaust system is really messed up.
Just my 2 cents.
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