| Author |
Message |
Warren Moore
DieHard
Victoria
JZZ31 N/A
Posts: 717
Reg: 01-2010
|
looking at turning my soarer into more of a weekend/track car so i am considering going 3" straight through, no cat, into blitz nur spec muffler. just wanted to know if there would be much noise/performance difference compared to having a high flow cat? meow |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 875
Reg: 08-2008
|
Noise difference, yes.
Performance difference? With a good high flow cat, there will be almost no difference.
Gutted cats are just good free way to get a little bit more power if you're still running a stock cat and cant afford a hiflow. |
Warren Moore
DieHard
Victoria
JZZ31 N/A
Posts: 718
Reg: 01-2010
|
would it be noticeably louder without a cat? |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 876
Reg: 08-2008
|
Yep, and it'll smell alot more too.
And you'll get carbon onto the rear of your bumper. |
Marc Hoffmann
TryHard
Vic
Soarer TT
Posts: 279
Reg: 07-2009
|
my cat was a highflow, now its a 'super' high flow,
-maybe a tiny bit louder.
-bumper clean as
-no smells what so ever. |
Warren Moore
DieHard
Victoria
JZZ31 N/A
Posts: 719
Reg: 01-2010
|
you can get super high flow cats? how much did it set you back? i got quoted $350 for a normal high flow.. |
Mark Pattel
TryHard
Queensland
RT142 with a 1jz and R154 5 speed
Posts: 119
Reg: 04-2006
|
haha I think Marc is meaning he has a gutted cat. I'm sure its a 'track' only car though. |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 877
Reg: 08-2008
|
Marc Hoffmann wrote on Friday, October 22, 2010 - 01:02 am:-no smells what so ever.
Then you need to get your sinuses checked. |
Jeff Bedsor
DieHard
QLD
TT
Posts: 951
Reg: 10-2006
|
Mine was 3 inch pipe straight through the cat, no carbon and no smell at all. Removing the cat shouldn't make a lot of difference noice wise. |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 878
Reg: 08-2008
|
For the people that are saying theres no smell.
Sit your car in a garage with the exhaust facing the inside for 5 minutes, then tell me theres no smell lol |
Marc Hoffmann
TryHard
Vic
Soarer TT
Posts: 280
Reg: 07-2009
|
A standard car will make a terrible smell in that same situation, and to be honest I doubt people are too worried about the smell their car makes when reversed and left running in a garage.
When I said no smell I mean when sitting at the lights or normal driving.
and mark pattel is right, but i did the same as jeff |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 879
Reg: 08-2008
|
Marc Hoffmann wrote on Friday, October 22, 2010 - 02:24 pm:A standard car will make a terrible smell in that same situation
I'm yet to notice it.
Marc Hoffmann wrote on Friday, October 22, 2010 - 02:24 pm:and to be honest I doubt people are too worried about the smell their car makes when reversed and left running in a garage.
I wasn't talking about JUST that situation... it was an example
Marc Hoffmann wrote on Friday, October 22, 2010 - 02:24 pm:When I said no smell I mean when sitting at the lights or normal driving.
Well of course YOU won't be able to smell it, because the exhaust exits at the BACK of the car. But i can guarentee everyone behind you can.
When standing behind my brothers soarer i can smell the fumes easy, and don't get me started on mine(and my mates) rx7... that thing would choke you just by walking passed it. |
Mike Beck
Goo Roo
New Zealand
E36 Coupe
Posts: 5127
Reg: 11-2005
|
 is how it will sound.
 |
Damian Ware
Goo Roo
Victoria
UZZ32
Posts: 1784
Reg: 10-2005
|
Matt Sartori wrote on Friday, October 22, 2010 - 02:42 pm:Well of course YOU won't be able to smell it, because the exhaust exits at the BACK of the car. But i can guarentee everyone behind you can.
When standing behind my brothers soarer i can smell the fumes easy, and don't get me started on mine(and my mates) rx7... that thing would choke you just by walking passed it.
I agree with you, some cars tuned correctly or with factory ECU will smell bad with no cats compared with them but there have been examples I have seen where there is hardly a noticeable (I think this is fuel based as BPU and not cats stink.)
How will it sound, it will be slightly louder but not greatly different over a ultra high flow cat. |
Shane Haverkamp
TryHard
nsw
soarer TT
Posts: 413
Reg: 10-2007
|
driving the car on the road with no cat can get you bum raped by the police man.
isn't the fine something ridiculous like $10,000 max or something? though i dont know how they prove it with out a fancy emissions tester |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 880
Reg: 08-2008
|
Shane Haverkamp wrote on Friday, October 22, 2010 - 05:06 pm:isn't the fine something ridiculous like $10,000 max or something?
The fine is issued by the EPA, not the police.
So unless you get inspected by the EPA(Not very likely) you'll be okay.
And if you're still paranoid instead of running a straight pipe just run a gutted cat or a cat with a pipe smashed through it.
And if you're stupid enough to take your car over the pits with a straight pipe after being yellow stickered/defected you deserve the massive fine lol |
Nathan Richardson
TryHard
N.T.
UZZ32 #445 (V8 Supercherged 5Speed. 291RWKW)
Posts: 329
Reg: 02-2006
|
I don't believe there has been anyone in history to be slapped with the $10k EPA fine. |
Warren Moore
DieHard
Victoria
JZZ31 N/A
Posts: 720
Reg: 01-2010
|
thanks for all the info guys especially matt, however i think i will go straight through with no cat smell isnt really an issue to me.
just thinking, my distant plans are to do a single turbo setup on my NA and im looking for 350+rwkw. would 3" be big enough, or would 4" be more suited?
Mike Beck wrote on Friday, October 22, 2010 - 03:17 pm: is how it will sound.
mate has a gtr 3" straight through no cat and i reckon it sounds tuff as nails. have a look at my profile pic |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 881
Reg: 08-2008
|
Warren Moore wrote on Friday, October 22, 2010 - 11:20 pm:mate has a gtr 3" straight through no cat and i reckon it sounds tuff as nails. have a look at my profile pic
Bit different between a straight through 3" on a turbo car and a N\A car man.
N\A car will be louder and a bit more raspier |
Warren Moore
DieHard
Victoria
JZZ31 N/A
Posts: 723
Reg: 01-2010
|
Matt Sartori wrote on Friday, October 22, 2010 - 11:34 pm:N\A car will be louder and a bit more raspier
even better =D |
Murray Lund
TryHard
NSW
V8
Posts: 361
Reg: 07-2005
|
I had a look iside the hi-flo cats I fitted to my car and I can't see how they would impede anything. So if a hi-flo cat makes virtually no difference to the flow of your exhaust system, then why go with go the no cat, gutted cat route. Is it just so you can say you have no cat? |
Scott Wilkes
Goo Roo
Tasmania
92 TT Factory Manual, 70 HG GTS Monaro
Posts: 1842
Reg: 10-2008
|
ive had no cat on my soarer and 84 sigma for a while now. No side effects so far, found with the magnaflow highflow cat on the soarer my spool up time was increased by a few 100 revs.
Got pulled up by transport when i first did it, they gave the car a quick check over, looked under the car at the exhaust me and my mate made, commented on the quality of it and send me on my way lol.
They completely missed the no cat part |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 883
Reg: 08-2008
|
Murray Lund wrote on Saturday, October 23, 2010 - 05:48 am:So if a hi-flo cat makes virtually no difference to the flow of your exhaust system, then why go with go the no cat, gutted cat route. Is it just so you can say you have no cat?
decent hi flow cats are pricey.
gutted cats are free. |
Damian Ware
Goo Roo
Victoria
UZZ32
Posts: 1786
Reg: 10-2005
|
Matt Sartori wrote on Saturday, October 23, 2010 - 10:18 am:decent hi flow cats are pricey.
gutted cats are free.
$300 from an exhaust shop and roughly $160 off ebay.
As to not getting an EPA fine, EPA in conjunction with police are setting up testing booths where they inspect cars on sight. Instead of being sent to EPA with a chance to fix issues you get on the spot fines.
The fine if you exhaust is over the limit is $584.
They also issue on the spot fines for anything that would have you sent to EPA such as illegal mods aftermarket computers ect.
IMO no for a street car in particular an N/A 3.0lt where the performance gain will be 0-1rwkw is just plain silly. |
Mark Pattel
TryHard
Queensland
RT142 with a 1jz and R154 5 speed
Posts: 121
Reg: 04-2006
|
LOL your going to put a 3inch straight through exhaust on a NA Soarer? Its going to loose power and sound painfully bad. Why dont you just wait till you have done this single turbo conversion till you do the exhaust? Sounds more logical that way. |
Nathan Richardson
TryHard
N.T.
UZZ32 #445 (V8 Supercherged 5Speed. 291RWKW)
Posts: 332
Reg: 02-2006
|
I'd Agree with Mark on the 3" exhaust. 2.5" would be the largest I'd go NA. the power you would loose would be bottom end as well wich isn't ideal in a auto Soarer. |
Warren Moore
DieHard
Victoria
JZZ31 N/A
Posts: 725
Reg: 01-2010
|
Nathan Richardson wrote on Saturday, October 23, 2010 - 08:17 pm:I'd Agree with Mark on the 3" exhaust. 2.5" would be the largest I'd go NA. the power you would loose would be bottom end as well wich isn't ideal in a auto Soarer.
as I previously said, I am going to do a single turbo setup in the future and my R154 is going to get put in within the next few weeks.
i also have a question.. "my distant plans are to do a single turbo setup on my NA and im looking for 350+rwkw. would 3" be big enough, or would 4" be more suited?" |
Matt Sartori
DieHard
Western Australia
Rx7
Posts: 884
Reg: 08-2008
|
Damian Ware wrote on Saturday, October 23, 2010 - 02:34 pm:As to not getting an EPA fine, EPA in conjunction with police are setting up testing booths where they inspect cars on sight. Instead of being sent to EPA with a chance to fix issues you get on the spot fines.
The fine if you exhaust is over the limit is $584.
They also issue on the spot fines for anything that would have you sent to EPA such as illegal mods aftermarket computers ect.
*shrug*
never heard of these in perth nor have i ever seen these. |
Phil Gibson
Goo Roo
WA
'91 UZZ30, '91 manual UZZ31 track bunky, '94 blk/blk UZZ31
Posts: 1738
Reg: 07-2005
|
^ and given we dont have annual inspections or anything here i would say if they did do this 90% of cars on the road would fail |
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