I want 150bhp
Turbo Mini Forums

I have a metro turbo unit so far I plan to have the cylinder head machined out to 28cc per cylinder and have the exhaust and inlet manifolds matched to the head. I have an intercooler which I will rig up a water spray onto to help keep inlet temps down. What boost do you think i will need? I was planning to run 14psi. And most important is this possible

150 BHP with this configuration is easy! around 15psi boost

Providing you have it set up on the rollers and the rest of the engine / gearbox is capable of withstanding this : wink:

Forget the water suppression as going this way to suppress detonation is an excuse for not catering for detonation in the config of your engine spec!

Intercooler and around 28cc chamber volume on a stock 1275 should give you around 8.4:1 C/R

This together run on optimax petrol,
you should not have detonation until 15-ish…. psi of boost

One last word there are many permutations for engine configs this may be the way you want to go ?

Oh! water suppression forget it!

only my oppinion

i think he means having a water mist spray on the IC ben rather than water injection :)

Right budd

pennys dropped!

IC sprays help matters only forshort bursts in my book say 1/4 mile
but none of us use them on hear iam i correct?

in saying this chaps

Thanks Benross Im glad that it is possible the way i was planning. Will I need to change the cam or just change the rockers to 1.5.1? Thats what I want bud a mist spray

An upgrade to a different cam is a worthwhile modification whilst you have the engine in pieces. Many people use the Avonbar Phase 2 cam with good results, or else the standard normally aspirated MG Metro camshaft is a good alternative also.

std bottom end
low comp head
IC
12-15psi

woooooooosh!

alex

AlexF

:) :) :)

i want never gets!

not yet

AlexF

what else do I need to do then? I have a budget of £1000 All info is much appreciated

Just fit a bleed valve and be done with it. £25 sorted! :) :)

Its only a bit of metal. If it blows it blows!

http://www.putfile.com/mini300bhp

come on people this is my first mini turbo. And im asking as i have not got a clue. You guys on the other hand have probably built an average 2 engines each. What do I need?

"td bottom end
low comp head
IC
12-15psi "

Take your metro engine and fit it!!!

In terms of what else you need... hit the serach button

Alex

AlexF

its surprising how much stick a standard GOOD engine takes alex
WHoooooosh!!!!!!!!!

Agreed, as we dont need to rev our engines to get the power a std bottom end in good order copes easily with 150bhp.

-MINI CLUBMAN 1380 TURBO-

It worth replacing your clutch plate and pressure plate to a grey one, as there's nothing worse than burying your right foot and just getting a load of clutch slipage.

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

I have already taken the head off for the work and was supprised to see it had been re-cond before i brought it all pistons look standard and there is no piston slap and its all been decoked as well. Is the gearbox up for the job its a fully re-con std unit no X pin dif or anything. Yet!

It will definatley be worth fitting a twin pin diff. I'd also be fitting SC drop gears when running the kind of boost you'll need for 150hp.

Phil.

WWW.TURBO-MINI.COM

Phil how much boost do u think I can run till I can change the drop gears and diff?

would he perhaps need to upgrade his diff and drop gears ? i want to do this but if it 8nt required i wont lol

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MikeRace, Mini13

Squinty

Right lets put the record straight without going into mass detail, as we would need another server to cope!

There are loads of modifications you can do to the humble A series, turboing is just one of them

if your aiming around the 150bhp mark

Not in any order:

The weak links are ...... drop gears these need replacing for straight cut type it isn’t actually the gears but its the radial loading which wipes out the thrust washes
fitting straight cuts eliminates this or nearly…

Next is the diff fit a MINISPARES 4 pin diff and NOTHING! else!

Next is the clutch, it starts to let go slipping around 125 to 130 BHP this needs uprating

If the C/R is lowered and an ic is fitted and the crank is in order, bearings etc
then! you should have a margin of safety, only slightly, running those bhp figures your after

I am sure other peeps would like to add to this

But please don’t aim for the big numbers straight away if this happens and you blow your engine and lose shed loads of money this will piss you off.

Aim for lower power figures say 130 bhp you will be more than happy:
Propping the bar up!

we havent even touched cam choice, exausts, rocker ratio, head mods, valve types mapped ignition, gear ratios etc ect ....... the list is endless!!!!

hope this inspires you to SEARCH further on this excellent forum

Ben:

Edited by BENROSS on 24th Aug, 2005.

Well said Ben.

Nothing more to add!

my advice is to start from the bottom up then you dot have to worry about braking stuff well especially with lower power anyway, you can always change bits for more power easier then, then stripping the engine again to uprate the bits you could of done previously. you will always want more power!!!