160 bhp spec?
Turbo Mini Forums

ive been hunting and researching for a while now so here goes.
im aiming for 160 bhp but 170 would be nice , im also on a budget so i cant really aim money at the engine bay with a big cannon.

my spec so far is this-

1275 std turbo pistons
oil spray jets
dry decked block, main straped , 11 stud.
12psi from a t25
mg, or avonbar phase 2 or phase 3 cam?
vernier belt drive
smart car intercooler with fan and an audi a3 intercooler both with water spray jets fitted
mg spec flowed and polished stg3 ish head giving 8.2:1 CR

being run by su carb with an avonbar 12psi needle and megajolt jr lite v4 from autosport labs

i know the pistons are a limiting factor but from research they will take that 12psi reasonably, and i dont want to melt expensive pistons if it goes tits up.

your opinions and ideas would be appreciated gentlemen...and ladies

I think 12psi for 160-170bhp is maybe a tad optermistic. A couple more may be needed.

Also I'd advise getting the fuelling set on a rolling road rather than relining on the Avonbar needle.

And don't bother with the P3 cam.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

If you are on a budget I wouldn't bother with the oil jets. Also just wondering why 2 intercoolers instead of 1?

As for a cam MG or ph2 would be my choice. I hear the MG will help spool up the turbo a little earlier than the ph2 and will probably be cheaper (apbellamy may have one for sale as I believe he is getting a new cam for his build).

Again dry decking is a nice to have and not strictly necessary if you are on a budget.

Same with the belt drive unless you already have it stick with a duplex chain.

Also to re-iterate wil_h I reckon you will need some more boost to make 160bhp. We have a similar spec engine in the van and we are hoping for about 140-150bhp at about 14psi. Aparrently people have ran std turbo pistons at upto 18psi without problems.

If something is worth doing, it's worth doing half of.

im going to set the fueling up with a wideband gauge first and then optimise it on the rollers, i was thinking that the avonbar needle would be a good starting point.

the oil jets and drydecking are free as its just metal and time.
im going by the idea of two intercoolers being better than one, just to make sure the charge temps as cool as i can get it.
i allready have the MG cam and a few spare, but i didbt realize it was actually better than the p2. why isnt the p3 cam anygood?
ive allso already got the belt drive setup as a cheap ebay job.
if the pistons will take 18psi then il go with 16ish as a safe mark

I would start with a standard needle and profile it yourself the Avonbar ones I have had have been hit and miss!

Forget dry deck and belt drive, put that money towards some good pistons

Paul

I seriously doubt it!

cam wise, the Phase 3 is a proper race cam, it only comes into its own if you keep the revs high, its just not suited to the road.

Ph2 produces the goods but looses drivabillity over something like an MG cam.

Two intercoolers will be a PITA to plumb, I think it will be better to go for one big cooler.

1399cc, Eaton M45 supercharger, N2O system, compression ratio 9.23:1, boost pressure 0,8bar/11.6psi.

http://www.garaget.org/?car=176816

You dont need to go so wild on a budget build!

Better pistons
good head
duplex cam driving a 255ish cam

and have fun :)

AlexF

as above,

mine is 'basically'..

1380
omega pistons
med fi head
avonbar ph2 cam
straight cut drops and box
xpin dif
big intercooler
megajolt
18psi


170 bhp :)

remmeber of course your gearbox needs to be good - std helicals on 170 in my glittery one munched itself very quickly more than one hehehe

AlexF

Alex was that with SC Drops or not?

If something is worth doing, it's worth doing half of.

yes just the drops were SC

AlexF

the two intercoolers are because i dont really have the money for one huge one, and i also allready have the 2 intercoolers and they cost me nothing.

the dry decking is a small improvement over the std setup in my mind and although its not relly reccesary its worth having as it cost almost nothing to do and i recon should give me a slightly safer engine

for now ive got a jack knight rebuilt box with a rebuild 4 pin to use, but im just going to runn the engine in with this carefully and then get it on the rollers to see what i can get out of the engine.

the t25 ive got to use is costing me 40 quid befor i sell the t3 so should be good value for money, the one thing i hated about the t3 was the......... LAG..... so if the t25 gives me slightly less lag with similar power potential then im a happy man

you can get a cossie cooler for about £20...

Never seen a twin IC setup....all that pipework must be the same length as a humans intestine by the time you've finished!

if you mean the 2wd one with the 45degree pipe at the top then ive allready got one of those as well

compared with the other two its smaller and thiner, i recon i can get the two coolers very close to each other with a minimal of piping, but il see how it pans out on the car.

mine is basically ,

1310cc
home ported head
8.5:1 cr
gt17 turbo
omega cast pistons
stock block ,crank ,rods
not balanced
no centre main strap
helical drops
4 pin diff
straight cut clubman gearset .
small intercooler
verto clutch
mjlt

168 bhp at 6350 and 6950 rpm

12psi boost .



(all data at rr shootout )

Edited by robert on 23rd Dec, 2009.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

You always piss up my calculations Robert. I wonder if the lower losses of the large turbine affect it?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

i need a GT17.

Me 2!

If something is worth doing, it's worth doing half of.

I'd ditch the 2 IC setup and belt drive. Sell one of the IC's and put your money towards megajolt.

IIRC I made 150bhp at 8/10psi with a slipping clutch. So could be doable on 12psi with a higher CR. If your running 8.2:1 I think you'll need some more boost!

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

robert what cam are you using and the CR your running ?

impressive!

Its one of Roberts jiggery pokery magic cams.

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