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I supported Toymods
Location:
NE Melbourne
Registered:
May 2002
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Live axle under diff exhaust, anyone done it?
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Sun, 31 August 2003 15:43
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what do people think of the idea of this? good/bad idea. obviously need short stroke shocks, but i'm sure i'll get told that by everyone. but a 2 inch pipe should fit nicely beside the diff centre on an early RWD toyota, and ground clearance shouldn't be too much of a problem. could it be expected that any increase in performance would be noticed on a stockish 4AGE for example???
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Location:
c'town, NSW
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Sun, 31 August 2003 22:12
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u will not feel any difference in power.
why go to the hassle to make your suspension suit your exhaust? the suspension should be suiting the rest of the car.
i have seen 3.5" mandrel done properly over the diff that has never been hit by the diff, so 2" over the diff should not be a problem at all.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: Live axle under diff exhaust, anyone done it?
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Mon, 01 September 2003 03:25
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I'm with Rob on this one, but if you feel you must, make sure that your suspension droop ain't going to hit it. Short stroke shocks would do the trick, but a couple of strategically placed bump stops would be heaps cheaper. You would need to fabricate somewhere to put them though.
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Location:
Melbourne
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Mon, 01 September 2003 09:23
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I've got a under axle exhaust on my Sprinter. I got sick of every exhaust place claiming that they could do it over axle without hitting anything. Under the axle, they still managed to get two bends into it, when it could have been one.
I've never got the suspension to droop enough to hit the exhaust. Although I do have shorter stroke shocks, it will hit as i've jacked up the car to check if it would.
Performance gain, if there is I can't tell.
Actually all the exhaust places i asked to do it wouldn't even try. They kept going on and on about how when I hit a bump my exhaust would fall out. 6 months later it's still there.
Daniel
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Tue, 02 September 2003 01:21
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I've seen 3" under the diff with no problems.
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Location:
Eskilstuna, Sweden
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Tue, 02 September 2003 04:37
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My two cents is that going under the diff with the exhaust just increases the chances of hitting your exhaust (even though some people here have been lucky) without any power gain. Going over the diff is a safe option, so why go under the diff?
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Location:
Madrid - Spain
Registered:
August 2002
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Re: Live axle under diff exhaust, anyone done it?
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Tue, 02 September 2003 04:45
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I agree but having said that, my exhaust goes over the diff. I put another housing in about 6 months ago and put the upper left hand trailing arm rear bolt in the other way. The bolt tail collected the exhaust under bump and tore a hole in it.
Moral of the storey. If Toyota engineers can stuff things up I guess we can too. Either way so long as you have clearance it shouldn't matter.
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Location:
Melbourne
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Tue, 02 September 2003 21:06
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I got three inch over the diff on a early RWD Toyota, dumped on its arse without it hitting.
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Location:
was adelaide now newcastle
Registered:
February 2003
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 02:26
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i have a 21/2" inch under diff system on my ae86 with short stroke shocks nothing hits anything it shouldn't and,has been on car for over a year (changed from import 2" under diff system which was on the car for about 3 years), i can see flow benifits for those not going for the full mandrell bent system. surely press bending a large pipe into a "U" shape to go over the diff will reduce diameter of the pipe considerably, this can be avoided by going under the diff, my whole system doesn't have many bends at all (kinda resembles a very long/straight z shape).
matty.
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Location:
adelaide
Registered:
April 2003
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 02:58
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| rob_RA40 wrote on Mon, 01 September 2003 08:12 |
i have seen 3.5" mandrel done properly over the diff that has never been hit by the diff, so 2" over the diff should not be a problem at all.
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clearly the car is not low enough!
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Location:
Malaysia,Kuala Lumpur
Registered:
July 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 11:28
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I had my cress GX60 fitted with the 1G lately.Went 3inches all the way. I 'supervised' the exht pipe fitting and the guy first said 'under the axle is fine'. Believe u me, there's sufficient space to go over the axle and try bump stops. I'll have to redo the whole thing again as the job was a wee bit sloppy...
Still room for improvement.
cheers
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Location:
Colac, Victoria
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 11:59
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i cant see any benifit of under the Diff here - - a decnt over diff would be " safer " and more out of the way of under car ojects hooking into it ..
performance wise - who knows if its a good or a bad thing - personally im going mandrel bend all the way with the gt4 - over diff .. Under would be just plain silly on it
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Location:
Colac, Victoria
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 12:02
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Either that or on the ta22 goto a side pipe setup - one bend off the Exhaust manifild leading to a dump before the wheel - Check legalitys on this - you can do it on utes no problems ( had an insanely loud 3.5 inch system on my dads HZ ute when he had it - twin dumps before the rear wheels ) and i know it can be done on XB coupes IF the rear coupe windows are fixed in a way that they cannot be wound down
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 12:10
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I will most likely have the exhaust on my TA22 under the diff!! This maybe a twin or a large single, with the car being lowered using decent shocks and large wheels there is no way the exhaust will hit the diff or anything on the ground.
I think some people are missing the point that the diameter of the wheels do not change when you drive over bumps. Sure enough the diff will bounce up but if the car is lowered it wont go up a great deal. So it doesnt matter how low the car is, the exhaust WONT hit the ground.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 12:11
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| Classique71 wrote on Thu, 04 September 2003 22:02 |
Either that or on the ta22 goto a side pipe setup - one bend off the Exhaust manifild leading to a dump before the wheel - Check legalitys on this - you can do it on utes no problems ( had an insanely loud 3.5 inch system on my dads HZ ute when he had it - twin dumps before the rear wheels ) and i know it can be done on XB coupes IF the rear coupe windows are fixed in a way that they cannot be wound down
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You cant have a side pipe exit on the passenger side.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 12:19
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I thought the side exiting exhaust had to exit behind the rear wheelarch?
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 20:42
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No it doesnt have to. But it has to be behind the last opening window.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 21:29
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I think there is rules as to how close the pipe exit is to an opening window. This is obviously not applicable to Luke Stitts crown though. *cough cough* 
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 23:22
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| Cool1 wrote on Thu, 04 September 2003 22:11 |
You cant have a side pipe exit on the passenger side.
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Are you sure? I would've thought it'd make more sense to put it on the opposite side to the fuel filler....
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 04 September 2003 23:39
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Which side is the fuel filler! That differs!
The main reason it can't come out on the passenger side is because then when you're driving along a road its pointing at the pavement.
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Fri, 05 September 2003 00:08
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If you take a look at a car, I can almost guarantee you that the exhaust is on the opposite side of the fuel filler.
I think spraying exhaust gas at people far away is of less concern than dropping petrol on a hot exhaust that's poking out nearby...
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Fri, 05 September 2003 00:11
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Hehe, I dunno. It's just that I've seen the rule about the passenger side before, and thats the only explanation I can think of!
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Fri, 05 September 2003 00:13
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Silly rule if you ask me!
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Fri, 05 September 2003 06:14
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| Nark wrote on Fri, 05 September 2003 09:22 |
| Cool1 wrote on Thu, 04 September 2003 22:11 |
You cant have a side pipe exit on the passenger side.
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Are you sure? I would've thought it'd make more sense to put it on the opposite side to the fuel filler....
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Yes i'm sure! You cannot have the exhaust facing the footpath. This is mentioned on the QLD transport webpage. I would assume this is the case for every other state in Australia aswell.
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Location:
Colac, Victoria
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Fri, 05 September 2003 08:13
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grinz - well the ute was totally legal  it was a great ankle warmer for pedestrians
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Location:
Finland
Registered:
November 2002
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Re: Live axle under diff exhaust, anyone done it?
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Wed, 10 September 2003 13:47
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I have under diff exhaust. No ground touches yet (been there about 6 months). Ground clearance is about 15cm. Exhaust pipe doesnt touch with diff in any case. Very silent. Weird thing is that my current setup (extractors + 2" pipe all the way and only STOCK rear muffler with 2" in 2" out) is much quieter, smoother and pleasent sounding than the previous setup (you know stock extractor, two mufflers and juice straw). And best thing is that the hole exhaust pipe has only two bends. I would get under diff exhaust anytime.
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Location:
Perth
Registered:
September 2003
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 11 September 2003 05:00
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| Nark wrote on Tue, 02 September 2003 11:21 |
I've seen 3" under the diff with no problems.
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on a subi or 200sx with no probs yeah....they're IRS.
i don't recommend it and remember one big speed hump or off over a kerb and bye-bye exhaust.
it's not worth the hassle dude, or the worry every time you enter a carpark. it's a bloody good reason why they run over the diff!
i had the same setup on my RX3, under the diff, and it would scrape everything and clang against the housing when cornering hard and all sorts of shit like that.
and no sidepipes are illegal, even lakespipes on hotrods.
the exhaust outlet must be a minimum of 1000mm from any opening into the cabin of the car, and from the underside of the door to your window is less that 1000mm unless you drive an F100.
this is why you can have them behind the rear wheel (ie charger style) but not in front.
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 11 September 2003 05:28
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RA40 dude. 
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Live axle under diff exhaust, anyone done it?
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Thu, 11 September 2003 07:41
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TA22 can also have a side pipe on the drivers side with no problems!
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