Cars that crackle, pop on overun?

[Zyp]

Mk1 Focus RS
987.2 Boxster with PSE (no fakery involved)

[morgrp]

Heat wrapping your exhaust helps make it pop on the overrun

[Benbay001]

morgrp said:

Heat wrapping your exhaust helps make it pop on the overrun

Can anyone confirm this?

[FerdiZ28]

jonnM said:

Anything with a GM LS engine.... Monaro's, VXR8's, Corvettes etc

Seconded. My LS1 does it on overrun every time, love it.

[Maracus]

Pebbles167 said:

I think the R53 Mini Cooper S did that. The later turbocharged ones did not.

They do

[mini1380cc]

sploosh said:

If I gap my plugs wrong I get flames out the back on over-run (oops)

('71 Triumph Spit / 6)

If I retard my timing i get flames and misfires. Drives like crap though

[akirk]

z3 3.0 - mine is an auto - and generally it would be rare if in auto mode - but push across into the manually wiggly mode and does it the whole time

[fletch78]

FerdiZ28 said:

jonnM said:

Anything with a GM LS engine.... Monaro's, VXR8's, Corvettes etc

Seconded. My LS1 does it on overrun every time, love it.

Me too, never fails to bring a smile

[happie33]

My cobra...... Sounds gorgeous

[schmalex]

I used to have a Merc CLK500 that, once I'd removed the front cats, crackled and banged beautifully on the overrun. The great thing was, at the time, it still passed all the emissions tests (although not legal now, I suspect).

[Adz The Rat]

GranTurismo S in sport mode or Stradale in race mode.

[danjama]

My mr2 turbo is great at all the dramatic stuff. Nice low crackles at low speed/rpm, full on crackles on lift off and gear change, and massive crackles and pops when driving hard. It's on a Kakimoto exhaust though which is very loud.

[twoblacklines]

From what others who have done the golf-tee-mod have said, my 330ci is supposed to do this on the overrun..mine does not.

[Gingerbread Man]

g7jhp said:

My old Caterham 7 HPC on Carbs (2 litre Vauxhall redtop with 175bhp) would spit foot longer flames on overrun!

Yep my Cat pops and bangs on the over run. Lovely trait.

[Baryonyx]

Benbay001 said:

Can anyone confirm this?

I would have thought any exhaust even without heat wrapping would have had an internal temperature sufficient to ignite petrol coming through the cylinders in unburnt as a result of fuelling on trailing throttle/exhaust cycle. Heat wrapping would insulate the pipe but I can't see how that would affect the result in any way.

Carbed vehicles are great for pops and crackles on the overrun. As the throttle closes, venturi effect tends to draw fuel down the jets which makes a very rich mixture, perfects for flashing off in the exhaust.

[anonymous-user]

FerdiZ28 said:

jonnM said:

Anything with a GM LS engine.... Monaro's, VXR8's, Corvettes etc

Seconded. My LS1 does it on overrun every time, love it.

+2 Mine also shoots flames from the exhausts on full throttle upshifts.

[rigga]

Pebbles167 said:

I think the R53 Mini Cooper S did that. The later turbocharged ones did not.

Yes the Turbo ones do, both my r56 jcw and my griff pop and bang on throttle lift off, more so the tvr.

[Matt UK]

s m said:

From my own experience on standard exhaust systems, R53 Cooper S and mk2 Astra GTE 16v

Yup, my R53 will enjoy a pop-pop-pop when hot and worked hard.

The Caterham also loves to show it's appreciation of a damn good thrashing.

[Patch888]

Ford racing puma.

And although not standard my MR200 fiesta

[Leafspring]

Benbay001 said:

kambites said:

Pretty much anything on carbs or with a badly calibrated fuel injection system will.

Or correctly calibrated. Depends on perspective

My 1975 Land Rover pops and bangs on the overrun. It's over advanced and running rich through a webber carb though

Sounds good, burns fuel at an alarming rate though