New exhaust, bugger all clearance

[mmm]

just got Paccie tri-ys and Magnaflow cats on the ute
the cats are much lower than i expected
75mm clearance only, already bottomed out on a small speed hump

note that springs replaced with Pedders sports ryders, lowish not dumped

i guess i'm a victim of my own mods

i'm thinking the only way to increase clearance is to go back to stock springs or go larger rims & larger profile rubber

or do i just live with it?

[Dane VN V8]

What do you want?

Bigger Rims?
Raised up car?

Dane

[macca33]

Post a picture. Maybe some exhaust ingenuity can be achieved to modify how the cats hang. Worth a shot.

Cheers,

Macca

[vyssbeast]

agree with macca ... but really you were in a good position to stay out of this situation... you have a VY2 ... cats are higher up ... you should have gone with 4-1 shorties with cats in the original position... and then the lowest point on your exhaust would be the catback flange or like on my car where the exhaust comes under the diff

[alexcs]

i had the same problem, went back to short 4-1's to get away from hte problem. lowered utes + long headers = scraping, no way around in unless you invest in hydraulics all round :)

[chillicatqld]

Have exact same problem here - my cats about 85mm though. Is quiet annoying at times - but can live with it.

Anyone tell me is there any power/flow differences from going the 4-1 shorties over the long headers?

[x_er_o]

same problem here, VX SS, but its the pacies that are the lowest point, stock springs and they are about 85mm clearence, have no ideas

[alexcs]

chilla they reckon theres a few kw in it, so it depends on your priorities. few more kw, or better ground clearance.

[chillicatqld]

is that a few klms for the worst or the better with the short headers????

[vyssbeast]

lets assume the short headers are worse of a few kw ... but whats more important to you. A few KW you wont feel or that scrapin you will hear/feel a fair bit?

[mmm]

i would have gone shorties & sacrificed a few kW for more clearance & piece of mind
i did a fair bit of reading over the forum mostly about performance & which header for street use - i chose tri-y's for this criteria not thinking clearance would be an issue

it is a pain in the arse, scraping everywhere

[AJR-01]

I have a VXSSII and had the same problems with Tr-Y's and cats being the lowest point in the car. I actually copped a canary for being 15mm too low at the cat flange (100mm legal height from the lowest point of the car) from an overzealous you know who...not sure your allowed to mention them...got my post removed once for saying the 'P' word. Took 3 days to sort out, anyway that's another story.

I've since changed to short 4-1 HM Headers and had the cats tucked up as close to the body as possible without fouling, tuned and the result is 234rwkw and to be honest it's marginal in torque loss. The car feels great to drive, very responsive and best of all no clearance issue and well over the legal limit. Probelm solved, however still lokking for more improvement.

By the way the mods are Double Valve Springs, YT 1.7 Roller Rockers, HPC 4-1 Headers, Hi-Flow Cats, Remus 'Race' Cat-Back System. The induction is a 2-hole mod, K&N Filter, Monaro CAI, 4" GTS Maf Pipe and BBK 80mm Throttle Body. Brakes are Harrops Street Performers, 3.9 Diff Gears and a Ripshift 'Street' short shifter (highly recommended).

[vyss2ute]

What part of the exhaust exactly is scraping? Is it the pipe of the TRI-Y's?, the Flanges? or the Cats themselves? I have 120mm from ground to the lowest part of the exhaust, which is the flange at the end of the tri-y's. (STD FE2 Height + 19's). If the cats are scraping then maybe you should look at a smaller body cat ie: slimbody magnaflow (91006) still a 2.5" just not high flow. There is still a bit of room to tuck the cats upwards towards the body of the car aswell so maybe a few slight inclined angles will give a little more clearance?

Hope you get it sorted!

Adam

[alexcs]

you have standard fe2 AND 19's dont forget.

people with superlows on 17's or 18's have 75-85mm clearance with nearly all long aftermarket headers and cats, there is bugger all room to move upwards without burning the heatshield material to shit and have contact.

[mmm]

What part of the exhaust exactly is scraping? Is it the pipe of the TRI-Y's?, the Flanges? or the Cats themselves? I have 120mm from ground to the lowest part of the exhaust, which is the flange at the end of the tri-y's. (STD FE2 Height + 19's). If the cats are scraping then maybe you should look at a smaller body cat ie: slimbody magnaflow (91006) still a 2.5" just not high flow. There is still a bit of room to tuck the cats upwards towards the body of the car aswell so maybe a few slight inclined angles will give a little more clearance?

Hope you get it sorted!

Adam

the protective sleeve of the cats is scraping
cats are tiny, protective sleeve adds f#ck all

cats to header flange is slightly higher
remainder of system rises after cats
cannot raise cats as headers are bolted directly to cats & set the height

[FLI355]

Moving to 19s will get you a bit of extra clearance. I know of some that I can get you cheap, they are actually off a certain VY SS Sedan that I know of ;)

Going to larger diameter wheels / raising it up is pretty much your only option as discussed apart from fitting the shorties in lieu of tri y's.

[Mr Muffler]

I have a VY11 SS ute with Hi Tech try y and round stainless core hiflo cats on 19s and superlow coils which gives me about 70mm clearence and must say very rarely have any scrapping issues.

If you have any plans to do more mods to your engine I would stick with try y.The longer secondaries will help.:teach:

[SS LOZ]

i have 4>1 shorties on my double s ute which has been lowered. scrapes on the cat back flange. anyone know a way to stop this

[chillicatqld]

As mentioned above my Tri-Ys give me about 85mm clearance to the CATS and the flange in front of it (end of headers). If I move to 18's or 19's can anyone tell me if this should give me more clearance? My exhaust guy reckons that short headers would not have resulted in any better clearance?

Also, if it does make for more height - what I don't understand is how? I thought that the rolling diameter of 17, 18 or 19's is the same? ( I am a bit unknowledgable in this area).
cheers for any help...