13 replies to this topic

[1976 clubamn]

as you will know i am in the process of building a clubman turbo. i am now thinking of exhausts.
as with everything it is difficult to visualise what an exhaust will look like untill it is fitted.

i would like to know what you have on your minis so i can get a better idea of what to go for.

i was thinking of a single up-swept centre exit. cool? please give me your thoughts.

ben.

[Turbo Phil]

You mean like this ?? :grin:

Attached Files

•  Exhaust.JPG   0bytes   1 downloads

[1976 clubamn]

yes exactly like that, looks prety cool. do you have one from the back square on.

ben.

[stevenford_uk]

i will got you pictures of mine today, its a twin centre exit, slash cut 4" pipes, 1 straight through silencer in middle of car, and its 2" bore from the manifold back!!!
bye bye back pressure!

[1976 clubamn]

thanks mate.

[redmini]

:wales: My old man (who's done a lot with minis in the past, he had a cooper s with downton conversion........and bloody sold it for a few hundred quid in the early 70's) told me that bmc engines need a certain amount of back pressure to run at there best. Now me been young and foolish at the time didn't believe him until I changed my straight through twin 3" exit system for an rc40, the increase in power was very noticable as was the increase in fuel economy. Since that day back in 94 I've never had anything different on my minis, proof is in the pudding as they say :grin:

[Turbo Phil]

Back pressure limits exhaust efficiency, so obviously to small a bore exhaust will limit power. On the other hand to large an exhaust will produce very slow gas speeds so the exhaust gases will not be extracted from the engine properly, this is why big exhausts do not work on a standard 998 for example....

However a decent 2" system should be fine for a Tuned Turbo motor...

Phil. :grin:

[stevenford_uk]

hehe, thats what me like to hear!

[redmini]

Back pressure limits exhaust efficiency, so obviously to small a bore exhaust will limit power. On the other hand to large an exhaust will produce very slow gas speeds so the exhaust gases will not be extracted from the engine properly, this is why big exhausts do not work on a standard 998 for example....

However a decent 2" system should be fine for a Tuned Turbo motor...

Phil. :grin:

:wales: That's much the same as my Dad said to me Phil, at the time I was runnning a 1275 with stage 3 head, 286 kent cam and single 1 3/4 carb. It went like hell, straight into a wall as I hadn't uprated the brakes. Oops :grin: :tongue:

[Turbo Phil]

It went like hell, straight into a wall as I hadn't uprated the brakes. Oops

LOL ....

Phil.

[redmini]

:wales: It wasn't funnny at the time, 10 days in a coma on intensive care. Bloody hilarious now though, fancy not uprating the brakes eh (knob) nearly as funnny as Beckhams penalty :grin: :tongue:

[1976 clubamn]

i have definatly decided to go for an upswept centre exit now, i have the standard metro downpipe, put can't seem to get hold of the rear section that i want. any ideas.

turbo phil what have you got? i am looking for somthing like the one you have. can you tell me where you got it?

cheers. ben.


p.s
turbo phil can i see a pic of your car square on, so i can see what it will look like from behind.

[fireman-sam]

on mine i have an avonbar 2" front pipe then a straght pipe into a mk2 golf 16v middle box that sits up in the rear subframe just rite with a single 4"upswept tale bit of truck looks very cool

[Turbo Phil]

1976 Clubman - I will sort a photo for you. I use a Maniflow system, twin box stainless.

Phil. :grin: