steering at 150 bhp problem
Turbo Mini Forums

So the moral of the story is; anything over about 130bhp and a twin pin diff is ESSENTIAL........

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

some more pics ... the pin shot with the little shiny patch is where i tried to make a mark with about 7 strokes of a file ende on ,,,,so it is pretty hard .
the other pics show palnet gears and the roll pin ,which seems to have wrapped itself round the pin in some way .

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

Well,




They're fu**ed.

robert,

i have been reading this thread as i have exactl the same symtom, ie boot down and at about 60 on it starts weaving... a lot!

dunno how much power i'm running, but i'm on a bar of boost so could be getting toward 150ish hp.

anyway from this post it looks like the weaving was still there after the mods to decrease the offset, yes?

did swaping the diff cure/reduce this?

oh and yes i know the suspension is straight as just had it aligned.

On 6th Jun, 2007 robert said:
well bit of an update here ,

after various nightmares on the diff front and the same prob being there when using the higher power ,
i decided to get a 4 pin diff and see if i could get it in there withuot taking the engine out ..
well the good news is yes you can and you can also get the pinion out with the engine in ,
so you can change diff ratio which im doing .

the bad news is ,
i was thinking i could sell my comp diff pin new everything single pin diff that was coming out ....

so i looked at the diff after getting it out and thought hmmm ,should that diff pin be rotating when i spin the gears

I DONT THINK SO !!!!!!!

yep .
the pin was welded to the planet gear ,and had eaten the roll pin !!

it was freely spinning ,and how far i was from a self dissasembling diff case i shudder to think ....P.H.E.W.!! here are some pictures
this pin a genuine competition pin ,,with all new gears and bushes etc,run on valvolene vr1 20/50 ,and has done about 3 k miles ..enjoy










happy to have got away with this so far , i feel this was the steering prob .

holy hell, its excavation day today!!!!

i thikn the combo of the 10mm less outset ,and the 4 pin diff combined to transform it joe ,at avon it was dead straight on all passes ,
but at santa pod ,it did have a bit of a weave at about the 60 to 90 mark , and i put this down to appallingly poor grip on the falkens .if i could id have 25 to 30 mm inset on the wheels ,but i feel its possible that even the 4 pin diff is binding up a bit and throwing the power from left to right at higher power ,whatever that is to run 104 terminals .

Edited by robert on 29th Aug, 2008.

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

Its all part of the fun, I kind of missed the weaving about at MITP!

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

www.fusionfabs.co.uk



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

I like the weaving

It makes me feel like a man when i dont back off through it

Ok thats good info,

hopefully it should be better once the quafe diff finds its way in,

I'll have a measure up of the offset but i know its going to be huge as the wheels are 7x13.

also i need to look at the corner weights at some pint as they are just guestimate, plus the shocks need winding up a bit too.


plus i need to look at the wastegates and map sensor at the weekend, last nights datalog breifly showed 260kpa of boost

Lol 260Kpa that good going!!

What range map sensor are you running?

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

www.fusionfabs.co.uk



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

3 bar,

pah , you mean you still have 40 unused !!!!

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

lol

Hi,
Probably nearer 90!
The 2 bar sensor I bought is 250kpa
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

I don't know a 3 bar map sensor and only using 2 bar of it...hold your head in shame!

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

www.fusionfabs.co.uk



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

hmmmm,

maybe i should get a 4 bar one....

seriously though, a couple of screws had worked loose in the exteral wasgtegate so it wasn't opening, this had then poped the pipe of the one for the vanes so the only thing limiting boost was the shut vanes stifling the exh flow.