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The mkiv Supra Owners Club

Ground Clearance Problems With HKS Exhausts


Guest Ash
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DIVERTED THREAD ALERT!!!!!

 

but since you asked....if you want a quiet one the priest is the best. Nurspec and Superdrager is next noisiest depending on whether the baffle is in the Nurspec or not. The best for performance and the loudest is the HKS HIPER.... now stop diverting the thread you naughty naughty boy.....

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alot of exhausts on all sorts of cars ground sometimes. ive just been to isle of mull in scotland where the roads had terrible cambers and lots of pointed hump bridges (nasty weight transfers to rear springs at speed), i grounded constantly so i had to get the exhaust lifted at a local garage. he managed to get an xtra 40mm or so and this solved most of my problem. normally around home i have no problems gounding, even over speed bumps.

the post about welding a plate at the point of contact is a good idea, its an old rally trick and works well at preserving the lifespan of yr lovely exhaust

 

jspec aero, auto, hks priest.

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Quote: from Syed Shah on 8:55 pm on Sep. 28, 2001[br]Wouldn't it be the other way round, as the j-spec had harder suspension.

 

Yes, but doesn't harder suspension mean less wheel travel meaning that the car sits lower?  Also, J-specs are on 16" wheels and UK's are on 17's - that's an extra half inch between the axle and the ground!

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  • 3 months later...

I have the Drager too.  My HKS its ripped to shreads!!!!!  I have bounced her to the floor at 145 on the M1, sparks flying, every speed bump kills her, thinking of putting some kind of guard on her, or what those bikers have on their knees sometimes that are coloured red, green, blue etc.

 

I know why I've seen some supras with exhuasts coming out in between the rear light clusters...Don't know how they've done it mind.

 

 

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It must be to do with how high it is mounted. Mine is so high I had to romove the heat shield and brace(mine is an aero). Will put brace back after I have modified it.

 

The exhaust is so close to the floor pan of the car about 10-15 mm.

 

My super dragger with CW pipes never grounds including when going over speed bumps. My car is standard supension except I do have 45 tyres on the rear.

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Martin (aka mrboost) has dropped his car 40mm's though....I drop mine on speed bumps on stock suspension so I'm not surprised that Martin does!

 

Also what does surprise me is how the people following me can't understand why I'm going so slowly over the bumps....wish I had a sign to display in the rear window!!

 

Actually I believe there is a led programmable display for the car for sale might have to invest.

 

*******

 

Back on subject, is it possible to heat gun, upwards, the arch in the bumper where the exhaust exits to allow for more clearance...then its a matter of warming and bending the zaust supports upwards to raise the back box? Or you could go the hole hog and get the original arch filled and then make a new hole in the bumper to give it that rather cool IMO incorporated look.

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Yes I have the exact thought!  The programmable LED that just HEH BACKOFF,  It always people in SAXO that try to overtake when you are on a Speed bump.... I now have a new nimple trick, I flash my headlights at the oncoming car and then go over two speed bumps at once, I.e Two wheels at the same time, No exhaust catches, you stop the **** in the saxo overtaking and cause endless problems being in the middle of the road to oncoming traffic......But at least the exhaust does not catch.

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Quote: from Ash on 5:02 pm on June 14, 2001[br]

Whilst the Drager and the Hiper sound the dogs, I've been looking into the problem of ground clearance.

 

For instance, Justin's exhaust is almost wrecked and he's only done a few thousand miles since having it fitted.

 

The problem seems to be the pipe in the region of the rear axle. Because it is such a large diameter and the fact that the pipe goes under the axle, clearance drops dramatically at this point.

 

It would make far more sense to split the single pipe into, say, 2 x 2" pipes: at least under the axle. This would give another 2" of much-needed ground clearance. Thus increasing the life of the exhaust quite significantly. Well, at least in Justin's case that is.  

 

I was just wondering if anyone else had the same ground clearance problem.

 

Yours,

J

 

I just mod the tunnel lower brace in front of the diff, and then raise the exhaust on its hanger brackets. Sometmes the front section needs heating to bend it a bit. No clearance problems unless the car is too low for sensible geometry.

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Quote: from Phil Wall on 1:14 pm on Jan. 17, 2002[br]Chris would you describe the modification please?

 

You need a ramp and welding gear with a "Shepherds Crook" heater, so not a DIY proposition. You basically heat the front section to cherry red so it will bend, and after bending up the tunnel brace to be formed into the opposite curve you bend the mounting bracket legs on the exhaust to lift it higher, you need some brute force an ignorance, best done when customers are distracted, but perfectly harmless and better than a holed or ripped off exhaust.

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