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Location:
campbelltown
Registered:
May 2002
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Location:
Perth
Registered:
October 2003
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Re: 1jz zorst and clutch issues
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Thu, 18 March 2004 09:30
 
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Im having the same problem with my zorst, its too loud, mine is 3.5" with a single straight though dynomax muffler, im thinking of putting a resonator on, dont know whether it will help or not. My car is particularly annoying cruising along at freeway speeds. Maybe take it to a zorst shop, go for a spin with the owner and see what he thinks might reduce the noise. If you are happy with the level and just want to get it over the pits, replace one of your exhaust gaskets with a restrictor.
As for your clutch, your pressure plate sounds a bit piss poor. Mine is 8.6" with a 1200kg pressure plate, organic full face plate and works a treat. I have heard alot of unfavourable comments about "RPM" brand clutches. Ohyeah my clutch is dealing with a 1700+kg car too, not 1200 or so like yours.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1jz zorst and clutch issues
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Thu, 18 March 2004 09:48
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i have a full 3 inch exhaust on my 1jz with no resonators and a single 3 inch muffler that is not straight through but has a slight bend in the middle. this decreases the sound a lot as my car can barely be heard on idle. havent had it tested though.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: 1jz zorst and clutch issues
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Thu, 18 March 2004 10:25
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I'm with chris - my car is a 3" all the way through, with no cat and no resonators.
All I have is a single muffler on the end (dont tell the epa), and it is suprisingly quiet - at idle you cant hear it.
remember that at the end of the exhaust is where you want to make all your concessions - getting a quieter muffler on the end will result in better flow than putting on a more restrictive cat/another muffler close to the engine, where the gases are hotter and the flow is much faster
I dont know what's wrong with your clutch, but my setup is quite similar (heavy plate, full-faced clutch) and the only time I occasionally cook it is on *hard* launches - it never slips when boost comes on
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Location:
Brisbane
Registered:
May 2002
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Re: 1jz zorst and clutch issues
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Thu, 18 March 2004 10:36
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Button clutches don't have to be as nasty as you think. I'm running a 5-puck ceramic clutch behind my 2JZ and it's perfectly drivable even in stop-start traffic. Not quite as smooth as an organic clutch but far from brutal.
Having said that, I originally had an organic clutch and it only slipped when I was really giving it arseholes. Your 1JZ shouldn't be enough to overwhelm a decent organic clutch, certainly not at 5psi. Go and talk to a performance clutch specialist, they will recommend something to best match your needs.
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Location:
campbelltown
Registered:
May 2002
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Re: 1jz zorst and clutch issues
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Fri, 19 March 2004 03:26
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yea i know my zorst sounds quiter then most of my mates shitboxes (n13's telstars etc) and all of them are apprently legal
been chasing some answers all day, no zorst shop is willing to make any guesses at to what the solution is. dont really wanna shell out for a new muff and find out its still over the limit 
dam it if only my car was a few months older it would be 96db
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: 1jz zorst and clutch issues
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Fri, 19 March 2004 03:45
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If there is a flange somewhere in your exhaust, why don't you fit a dodgy doover in there? Get a bit of sheet metal cut it to the size of your flange, dril a few small holes in there and bolt it in to your exhaust where the flange is. Silent car for engineering purposes. Remove after all paperwork is generated.
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Location:
campbelltown
Registered:
May 2002
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Re: 1jz zorst and clutch issues
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Fri, 19 March 2004 03:55
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yea i thinking that is going to be the cheapest/easiest option so far
just frustrating cuz i dont have the fundage to be testing muffs left right and center
also seems that it should be quieter then what it is anyways
cheers
nathan
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Location:
Perth
Registered:
September 2003
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Re: 1jz zorst and clutch issues
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Fri, 19 March 2004 04:05
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800kgs isn't exactly a heavy pressure plate. 1.5ton is a heavy pressure plate!
by simply adding an 'S' of bends on the straight pipe work will reduce the 'boom' factor a fair bit, and the subsequent noise as well.
hope this helps.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1jz zorst and clutch issues
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Fri, 19 March 2004 06:45
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Damn, 800kg is less than my stock GA70 pressure plate according to the clutch shop I spoke to, I'd be looking for a real heavy duty one! 
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Location:
Perth
Registered:
October 2002
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Re: 1jz zorst and clutch issues
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Mon, 22 March 2004 02:41
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FWIW,
I've gone with two resonators in my 1JZ MA61 with straight through 3" system - one hotdog, one smaller. Haven't got the car running yet (still awaiting new ECU), so I can only hope that it'll pass inspection. Resonators are surprisingly cheap - especially if you get them same time as the rest of the zorst (ie 12" resonator wasn't that much more than a foot of mild steel exhaust pipe).
Good luck and let us know how you go,
Justin
JZA61
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Location:
Sydney
Registered:
March 2003
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Re: 1jz zorst and clutch issues
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Mon, 22 March 2004 03:46
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| onejayzed wrote on Fri, 19 March 2004 15:05 |
800kgs isn't exactly a heavy pressure plate. 1.5ton is a heavy pressure plate!
by simply adding an 'S' of bends on the straight pipe work will reduce the 'boom' factor a fair bit, and the subsequent noise as well.
hope this helps.
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Isnt the whole point of an aftermarket exhaust, is to free up bends, make it larger, and gain performance?
Adding resonators, does that chew performance away??
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Registered:
June 2002
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Re: 1jz zorst and clutch issues
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Tue, 23 March 2004 01:11
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I am running a 3" exhaust.
It has a flowmaster in the middle & a straight through at the back, and it is real quiet.
I use to only have the straight through at the back and it was really loud (by comparison), added the flowmaster under the middle and it quietened it heaps.
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