just got FI metallic HFC, odd noise, suggestions please
#62
12-04-2006, 02:40 PM
Originally Posted by aHero4Eternity
i wonder how much worse it is...id like to hear that in person...
i guess ill just have to see what's up after i put on my HKS
if that doesnt help...i think imma switch to crawford
and see if that helps...i have a friend with crawford cats and no symptoms like this...so if i ask nice enough maybe he will let me experiment with his crawfords...
i guess ill just have to see what's up after i put on my HKS
if that doesnt help...i think imma switch to crawford
and see if that helps...i have a friend with crawford cats and no symptoms like this...so if i ask nice enough maybe he will let me experiment with his crawfords...The Crawford cats was my first engine mod, so they were on with the OEM exhaust. The sound of the exhaust only became deeper...I never heard the sound that is being questioned. I then added the HKS exhaust and the sound only became more exotic...Still no weird rattling sound. Then I switched the cats out for the test pipes and there was rasp, but only at the normal 3500rpms and up. I'm very anxious to get the Crawford's back on the car.
#64
12-04-2006, 03:07 PM
ok so wat i saw was that i hear a strange noise when i shift for a second,when the car decelrates and under wot normal driving even in high rpms didnt really show any noise but it did at all those points when under wot the noise was there strangly through the whole powerband not just above 3400. that was wat i just got from my car going around town.(with the windows down)
#65
12-04-2006, 03:41 PM
Originally Posted by ISMSOLUTIONS
It's a good question - and I don't have much of an asnwer than I have a feeling 
To me, there is more stress on the car, transmission, engine torque on deceleration or downshifting, so the effect is more promenant.
I thing you can hear it when accelerating too, it just blends better with the engine sound at that time.
Not a great answer....but like I said, I really don't have one either in this case.
To me, there is more stress on the car, transmission, engine torque on deceleration or downshifting, so the effect is more promenant.
I thing you can hear it when accelerating too, it just blends better with the engine sound at that time.
Not a great answer....but like I said, I really don't have one either in this case.
There's more stress on the car when youre decelerating? I find that hard to believe but maybe its just me.
My Injen system is less than 5 months old. I got it in late July and had no such noise prior to installing the HFC. It wasnt until I got my car back from the dealer after getting my engine replaced did I start to hear the buzzing/rattling noise. I got my HFC from Tony back in mid-October and did not have this noise at all. When I got my car back from the dealer, at first I thought, "o great, this brand new engine is already rattling. Dont tell me I have to get another replacement with only 400 miles on this engine" But then, I saw this thread and realized that it wasnt my engine, it was in fact my HFC. I have the ceramic version and they make the same noise as Calvin's metallic HFC.
Im looking for an answer as to how we can resolve this issue. Now, if the noise is just a noise, I guess I can live with it as long as the HFC aren't going bad or what not. But if this rattling/buzzing noise is a warning sign to a soon-to-be "fubar'd" HFC, then something needs to be done.
Dont get me wrong, I love my HFC and am very impressed with FastIntentions and their work, Im just curious as to what this noise may be.
#66
12-04-2006, 04:10 PM
The noise is rasp . The ONLY way to get rid of it , is to restrict the exhaust back up .Your f----- either way . Less power [ no rasp ] more power [ rasp ] Crawford has thier HFC's right on the edge of not making rasp . I have had RT cats [ rasp ] LeBree test pipes [ rasp ] test pipes [ rasp ] Crawford HFC's [ no rasp ] I made the least power with the Crawford HFC's .
I dont know who makes FI HFC's , but if they rasp they flow really well . If they dont rasp they flow less . There is no way around it with this motor . People have tried till thier blue in the face and every combination you can think of . You get one or the other.
I dont know who makes FI HFC's , but if they rasp they flow really well . If they dont rasp they flow less . There is no way around it with this motor . People have tried till thier blue in the face and every combination you can think of . You get one or the other.
#67
12-04-2006, 04:14 PM
#68
12-04-2006, 04:16 PM
this is not rasp that we are talking about i know what you mean by the rasp but all of these people including myseld have said that this sound does not come around the 3400-4000rpm range and it happens during deceleration. and why would a rasp noise be made when i shift. most people say rasp comes when heavy driving this noise comes from just reving from idle
#70
12-04-2006, 04:32 PM
i had my crawfords installed a month ago and this same issue came up - i posted but not much feedback.... cold start the rattle is there constantly for 10 seconds or so around 2k rpm's (idle cold start) and is also hear around 1.2k rpm's if held at the right spot when hot.....im not sure what it is, ive been under the car (jack stands) to hear it...and it seems to be coming from the rear end of the exhaust - (stock exhaust atm). and my cats dont seem to be making the noise.....the sound is more of a heavy empty can rolling on a rugged metal sheet......thats wha ti can best describe my rattle as.... or a better example would be 2 vibrating heatshields under the car....
also, if what you guys are describing is a very loud ZZZZZZ which i was getting also, it was my rear bumper that was tapping my stock muffler.....although i have a kenstyle kit, i simply sanded it down so it doesnt touch the muffler and that went away. <----- this made me realize one thing, adding HFC or TP's makes the stock exhaust 1) hotter....my fiberglass bumper is very warm near the trunk after driving and 2) more airflow = more vibrations.... things need to be bolted down tighter or reajusted somehow....my bumper was always touching the muffler wihtout me noticing, and never rattled until i added the HFC.....so im sure our problem is a rattle caused to a more vibrating stock exhaust...
can anyone confirm the sound i discribed? and does anyone with an aftermarket exhaust have this issue as well?
also, if what you guys are describing is a very loud ZZZZZZ which i was getting also, it was my rear bumper that was tapping my stock muffler.....although i have a kenstyle kit, i simply sanded it down so it doesnt touch the muffler and that went away. <----- this made me realize one thing, adding HFC or TP's makes the stock exhaust 1) hotter....my fiberglass bumper is very warm near the trunk after driving and 2) more airflow = more vibrations.... things need to be bolted down tighter or reajusted somehow....my bumper was always touching the muffler wihtout me noticing, and never rattled until i added the HFC.....so im sure our problem is a rattle caused to a more vibrating stock exhaust...
can anyone confirm the sound i discribed? and does anyone with an aftermarket exhaust have this issue as well?
#71
12-04-2006, 04:43 PM
#72
12-04-2006, 04:48 PM
#74
12-04-2006, 05:52 PM
Alright, I am not saying that it is your problem but there is a guy here in GA by the name of Chops who had the FI High Flow cats, his came apart in the inside and that was cause a rattling noise. I am pretty sure that his screen name is the same here. I will send him a PM on the other forum that we usually talk on with a link to this thread.
#75
12-04-2006, 06:16 PM
Originally Posted by bambam26
Alright, I am not saying that it is your problem but there is a guy here in GA by the name of Chops who had the FI High Flow cats, his came apart in the inside and that was cause a rattling noise. I am pretty sure that his screen name is the same here. I will send him a PM on the other forum that we usually talk on with a link to this thread.
Rick