Rx7Nub

I have been getting a "puffing" from my exhaust when I go over 150-160, and it really cuts out my acceleration, right now, I have some nice "speed holes" in my mufflers, fabricated by "rust inc." and I was wandering if that is the problem, I do plan on getting a new exhaust system soon, I was thinking racingbeat full tii exhaust, next spring, and I was wandering if that will fix the problem, or is it clogged cats? Either way, if I get racing beat, I am hoping it will fix this...

marlaman

Is that in MPH or KPH? i don't know what they use in canada. those bass ackward canadians.


just kidding about the last comment.

Rx7Nub

kms

dr0x

Just pull the cat off and look... you can tell pretty easily if its clogged.

BoostedRotors

What do you mean by puffing...a noise or smoke? Either one I imagine would have to be pretty bad to notice at 100 MPH/ 160 KPH

Rx7Nub

It is more of a noise, like, the exhausts kind of cuts out for a second at that speed or something, and I lose alot of acceleration... it is normaly only when I am goin over 160, but sometimes when I am doing heavy accelerating, it happens... I don't have much of a clue here..

Rx7Nub

bump

dr0x

Pull your cat off and look in it with a light. You can tell if its clogged, its not a hard task.

dr0x

If you dont want to replace it you can always gut it, we dont have emissions testing

Rx7Nub

Ok, I will check that out tonight, thanks

KenshinFC

sounds like fuel cut. Get an FCD (Fuel Cut Defenser).

- Kevin

Jimmy325i

Mine does the same thing when I run out of fuel system capacity. Time to get a bigger pump.

Your cats have nothing to do with this one.

KenshinFC

fuel cut fuel cut fuel cut...

get the fuel pump/injectors after you get intake + exhuast.

TonyTurboII

Uh no. You get the fuel pump first. Then a S-AFC, or comprable fuel computer. Then the intake and exhaust.

Rx7Nub

I am only at like 6500 rpm when this happens... fuel cut so soon? I thought it was 8 grand.

Rx7Nub

Shoudl i get an a/f guage, and see if I am running lean or rich and then get fcd or fuel pump?

Jimmy325i

Spring for a new fuel filter before you do anything else. If its happening that low, you've got a delivery problem big time.

Mine happens at between 8100-8400rpms depending on air density and how I have the S-afc set for the higher revs. This is on a BIG street port with TII intermediate housing N/A engine. A/F guage pegs lean and she cuts power completely. New fuel pump and probably new computer are in my very near future.

dr0x

I say replace the fuel filter, check your cat anyways. It may not be related to this problem, but it can still be clogged or close to it. These ARE old cars, and a lot of people (99%) of them dont take proper care of their car.

Btw, a turbo ii can go well over 100mph or 160km/h, saying its fuel cut = retarded unless buddy doesnt know how to shift.. but then I dont think hed be doing 160.

Mr. Eccentric

Now that were on the topic of high speeds, anyone else get that cycling warble drone type noise above 150kph? It sounds like my driveshaft is out of balance or something. It's like I can feel the rotors lumping around in there. It's okay at high revs in any other gear, just not at high speed. You'd think it'd be prone to this in 4th at 1:1, but not in 5th. Any thoughts?