Best exhaust for turbo mini?
Turbo Mini Forums

Running 150 bhp Will I gain any bhp over mild steel one?cheers lee

more speed 1293 turbo mini-180bhp 171tourque@15psi

best 80's mini at mini fair 2-2013 British mini fair 2014- runner up best 80
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Top 55 winner @imm2014
Runner up 80's @minifair 2-2014
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Material will have bearing on performance.

A 2" maniflow will be up to the job.

In the 13's at last!.. Just

Cheers mate

more speed 1293 turbo mini-180bhp 171tourque@15psi

best 80's mini at mini fair 2-2013 British mini fair 2014- runner up best 80
Top ten winner at players classic goodwood
Top 55 winner @imm2014
Runner up 80's @minifair 2-2014
Auto finesse sponsors choice award @ultimate stance 2014
mini fair best 80's winner 2015

Why not ask the man building your car? As I am sure Mr Owens or Jim could help.

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

Don't know jim!and endaf was unsure on best gain for a turbo.

more speed 1293 turbo mini-180bhp 171tourque@15psi

best 80's mini at mini fair 2-2013 British mini fair 2014- runner up best 80
Top ten winner at players classic goodwood
Top 55 winner @imm2014
Runner up 80's @minifair 2-2014
Auto finesse sponsors choice award @ultimate stance 2014
mini fair best 80's winner 2015

I got told a 2 inch Maniflow isn't up to the job. I still think its bullshit.

Was it by barry bad boy boost?

People have made 200+bhp with a 2" system

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

Mine included.

Although, I'd have suggested larger if he'd have said 200.

In the 13's at last!.. Just

i expect 2" is fine, turbos generally need larger bore exhausts than N/a in my experience so i went for a 2.5 playmini system does the job well although i dont think they make them anymore

as above 2" play mini is my choice as well nice sounding as a bonus

With turbos the key is minimum back pressure after the turbine, which can be achieved by going larger. But unlike an NA engine there is no point where an exhaust becomes "too big" (for the sake of performance). But you do reach a point where going bigger nets no noticeable gains, and just makes you look/ sound like an idiot. I would agree with everyone else and say that a 2" system would probably be fine, unless you looking at over 200 bananas in which case a 2.5" might be a little better.

A well designed 2" exhaust is restriction free up to about 150 Hp, restriction free meaning it gives within a few % of open pipe power.

The science behind this is that an engine doesn't care about exhaust diameter (either being pipe or silencer) it cares about flow. Given the fact that 1 sq.in. Of pipe flows around 115cfm, and an engine needing 2.2 cfm of exhaust flow per BHP you can calculate the performance threshold of say a 2" pipe:

(3.14 x 1^2) x 115 = 361cfm. ----> 361 / 2.2 = 164 HP

Now given the fact that a well designed silencer flows about 95% of pipe equivalent, and most of us do in fact use silencers a well designed 2" system with 2" silencer(s) is able to flow a restriction free 155BHP.

Accordingly a 2.25" system is good for 193HP, a 2.5" system is good for 238HP. (Methodology developed by David Vizard, google search exhaust science vizard if you want more info.)

To provide some real world data, a Integrale evo running a chipped 280HP (210 standard) through its very well designed standard 63mm or 2.5" straight through system easily sees 300HP after fitting a 3" system running exact same boost (I
ran mine @ 350HP)

This brings us to turbo territory where the words too big are not listed in the dictionary, have a look at
this article on turbo exhaust design by Garrett engineer Jay Kavanaugh:

http://www.tercelreference.com/tercel_info...ust_theory.html

Have fun reading!

Edited by Evoderby on 17th Sep, 2013.

interesting read thanks Evoderby

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

I once read in a book, maximum boost? Or something like that? the best turbo exhaust is the least exhaust haha

Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet

[quote=fab,8th Oct, 2010]fuck off

All pipe has a resistance to flow. The longer the pipe the greater the resistance so the length of the system has to be taken into consideration as well as the diameter

A round one with plenty of holes to keep the weight down

bigger the better

16V project underway