31 replies to this topic

[cooperdan]

Ideally a supercharger isn't a bolt on mod like most companies state.

Really you need to strip the engine down and inspect it. It needs to be in top order. You'll also need a decent transmission to cope with the torque.

I would say minimum, you'd need a fully rebuilt gearbox with a X pin diff and some straight cut drop gears for anything over around 110bhp.

To just bolt the SC on as a quick powermod and expect all the standard parts, which were designed to cope with 50odd bhp, to cope with all the extra torque is just daft really. When gearboxes and diff pins go, they go with a bang and have a tendancy to take half the engine with them.

what i was gonna say....

[steble]

86 turned out to be while having a blown headgasket which i found out just down the road when i left.

it has since had a race head put on and pulled 122.7bhp to be precise

[Sam Walters]

My 1293 pulled 118 without a supercharger. Now down to 107 On a Hiff44.

I use mine every day. After sorting some fueling issues its doing 29 MPG.

The block has not been decked to raise compression. (7cc pistons and 20cc head)
It still retains the mechanical fuel pump. (Changed back from leccy when weber to hiff44)
It still retains a verto clutch.
It has only lost 10psi on the pressure test in 10000 miles
Build costs including the gearbox were less then that of the average supercharger kit and the modifications needed.
it idles at 800RPM
my engine bay looks a state and to the unknowing eye looks standard

Its blown head gaskets due to poor "professional" setups.
Its wiped out two clutch plates in 10000 miles.
No rebuild in 10000 miles, no marks on the bore, nothing, starting to hear a slight bit of noise from the helical drops thats it.

Na goodness!



A second hand turbo setup are available fairly cheaply in comparison and offer an awful lot more more bang for your buck with headroom for an AWFULL lot more!

People rave about super chargers but how many of them have driven a turbo charged mini with the same boost level?

Oh and don`t the companies who produce these kits claim 120 BHP on a standard engine not one with a "Race head"

Edited by Sam Walters, 07 November 2009 - 07:37 PM.

[THE STIG]

i got 111.8 bhp and 106 ft/torque on a standard engine except for a 276 cam

superchargers give big torque increases as well as bhp

[1293sleeper]

86 turned out to be while having a blown headgasket which i found out just down the road when i left.

it has since had a race head put on and pulled 122.7bhp to be precise

i was only pulling your leg steve

[1293sleeper]

My 1293 pulled 118 without a supercharger. Now down to 107 On a Hiff44.

I use mine every day. After sorting some fueling issues its doing 29 MPG.

The block has not been decked to raise compression. (7cc pistons and 20cc head)
It still retains the mechanical fuel pump. (Changed back from leccy when weber to hiff44)
It still retains a verto clutch.
It has only lost 10psi on the pressure test in 10000 miles
Build costs including the gearbox were less then that of the average supercharger kit and the modifications needed.
it idles at 800RPM
my engine bay looks a state and to the unknowing eye looks standard

Its blown head gaskets due to poor "professional" setups.
Its wiped out two clutch plates in 10000 miles.
No rebuild in 10000 miles, no marks on the bore, nothing, starting to hear a slight bit of noise from the helical drops thats it.

Na goodness!



A second hand turbo setup are available fairly cheaply in comparison and offer an awful lot more more bang for your buck with headroom for an AWFULL lot more!

People rave about super chargers but how many of them have driven a turbo charged mini with the same boost level?

Oh and don`t the companies who produce these kits claim 120 BHP on a standard engine not one with a "Race head"

thats what im talking about a good high comprestion 1293 done right for big bhp NA A-series power. my 1293 is a 12-1cr cant wait to hear it run hopefully this week just gota set up megajolt

[Sam Walters]

Was done on 10.3:1 with those figures. Now i have a smaller chamber head. Waiting to go on.

Edited by Sam Walters, 08 November 2009 - 02:18 PM.

[1293sleeper]

i think the exact figur of my cr is 11.8-1 all i know is i didn't realise quiet how high it was till o cooked 2 start motors n realised i had a small miss calculation

[Nicole88]

ive been looking into supercharging my 1275, apparently you can get upto 60% more power from a standard engine
for the money they are i think they are well worth it.
also, i think it would be a really cool thing to have on my mini. people have 1340's etc all the time, so its something a bit different

and think about that beautiful whistle
hobba hobba

also, who cares what your mini is worth. if thats all you think about when you want to modify, whats the point in having it

is that a black rio i spy you have there???

if thats the case you aint allowed to supercharge it because as far as i'm aware atm i'm the only person with a supercharged mini RIO!!! ha ha ha

haha, i saw you in mini world the other day after thinking, ive never really seen a rio with a supercharger
bast*** someone beat me to it
how well does she drive?

Edited by Nicole88, 08 November 2009 - 04:20 PM.

[adam_93rio]

ive been looking into supercharging my 1275, apparently you can get upto 60% more power from a standard engine
for the money they are i think they are well worth it.
also, i think it would be a really cool thing to have on my mini. people have 1340's etc all the time, so its something a bit different

and think about that beautiful whistle
hobba hobba

also, who cares what your mini is worth. if thats all you think about when you want to modify, whats the point in having it

is that a black rio i spy you have there???

if thats the case you aint allowed to supercharge it because as far as i'm aware atm i'm the only person with a supercharged mini RIO!!! ha ha ha

haha, i saw you in mini world the other day after thinking, ive never really seen a rio with a supercharger
bast*** someone beat me to it
how well does she drive?

that was me, didnt realise the girlfriend was signed in.
anyway what she said ^^^^

[steble]

drives like a beast having starting problems atm but dont think thats got anything to do with the charger will sort that out when i get round to it.

feels so much better now i've done the head i was quite amazed how much more power i got out of it and it sounds awesome

in the time of me doing the supercharger i was driving a 16v gti golf and after the head gasket went while saving for a new head i was driving a 205 gti both of which i thought were *french clothing company*ing fast untill i got my mini back on the road so so much quicker and more fun

[Wil_h]

The idea that forced induction reduces engine life is not true. The problem is that done wrong forced induction can cause catastrophic failure very quickly. If done right, a 120bhp 1275 turbo/SC will most likely last longer than a similar powered NA 1275.

The reason for this is all down to how forced induction creates the power midstroke, meaning that the maximum stresses that an engine sees (TDC on the exhaust stroke) is hardly changed. However, you stick an extra 1500 rpm on an engine and you increase the stresses massively.

So a relitevely low revving turbo engine will be under less stress than a revvy NA motor. However, the main cause of failure with forced induction is pistons, this is usually caused by detonation, which is usually owing to too much boost, which can be controlled.

[1293sleeper]

my comment was that to spend £2k on a supercharger thats going onto a old standard 1275 is not a sensible way to spend money. i have spent about the same on a 1293 motor where every part is new and of a high standard and should produce nearly the same bhp and i am pretty sure it will out last any of the people whos have bolted these kits onto old engines.

[THE STIG]

super charger kits are £1200 not 2 grand though

[Wil_h]

I used a 70,000mile engine that has never been out of my car since it went in at Longbridge as a basis for my turbo conversion. It runs a modest 9psi and has over doubled the original 39bhp. Done 5000 miles so far, no signs of it wearing out.

I didn't change the diff, but I would advise anyone that this was a good idea, it's a weak point. Drops and the bax are more than up to 120 bhp given mechanical sympathy.

My conversion because £1k, if I had another thou to spend I could rebuild the bottom end and fit a diff for half that, then a rebuild of the box would be a few hundred. So £1500 to £1800 for a fully rebuilt turbo motor is similar money. Best thing about my engine is that it does 45mpg without even trying.