121 replies to this topic

[benb12]

What a fantastic enlightening topic. I realise now that i was clearly wasting my time and money putting in my 1275, if I'd just stuck a 998 in it I'd be good for 120mph! My stage 1ish 1275 don't do more than 87mph (that's almost back round to the 0 on the speedo by the way).

[Carlzilla]

im actually amazed with the 998 in the fellas mini from our club though, and i really aint a fan of the lad either, he drives like a complete male chicken, and gets right up your backside.
But i still fail to understand how it accellerated quicker than my 998 at the time (i think it was a high compression engine, had both block and head skimmed at minisport at some point before i bought the car), his will pull well to 90mph but not much more, so in theory i should have the shorter ratio and get to 70 faster than he can. Confused.

[1275npton]

my old completly standard 91 998 mayfair auto used to get 85 max on "the clock" on a slight slope on m-way. but i have read some where that clocks (newer ones at least) have the speedo set higher. think there somthing like 4mph faster at 70. 74 on clocks = 70mph.i now have a 1275 metro engined mini and havnt took her over 50 yet. give my a winding country lane any day.

[Wil_h]

What has not been mentioned is wind speed, a tail wind of 5mph will increase your top speed accordingly, add this to a slight down hill (and it only needs to be slight) and everyone believed the car did it all on its own. this is why world records are run twice in opposite directions.

For any of the silly claims in this thread to be believed then they must be recorded going both ways on the same bit of road.

Below is a list of official top speeds and then calculations to suggest required bhp for mph in a Mini. as it happens one of my 998s has a terminal speed on the 1/4 mile of 104mph (at 7k) the other reached 103 at bruntinthorpe but I never ran it in the opposite direction which is a shame as I had to go uphill.

HP Speed Model
34 73 850 Mk 1
57 87 1275GT
90 101 MPI JC S Works
63 90 1.3 MPI
55 85 1961 998 Cooper
76 97 Cooper 1275S
29.69 70
44.32 80
63.1 90
86.56 100
115.21 110
131.64 115
149.57 120
190.17 130
237.51 140
292.13 150
354.54 160
425.26 170
504.8 180
593.7 190
692.46 200

[AzMaN]

my 998 goes at nearly 900mph (sat in a shed traveling with the rotation of the earth)

[Ethel]

my 998 goes at nearly 900mph (sat in a shed traveling with the rotation of the earth)

Wow (runs out to creosote my brum brum to reduce drag)

[danrock101]

I had to go out and do a little test


out onto the autobahn that is

sorry about the dodgy picture, those autobahns are very bumpy

Edited by danrock101, 03 January 2011 - 11:34 AM.

[Cooperman]

Clearly you need around 82 to 85 bhp to do 100 mph, so if someone thinks their 998 with a so-called 'stage 1 kit' does 100, then they have a kit which has more than doubled their bhp. Clearly that's impossible. All the 998 Cooper changes, head, cam, twin carbs, 3-branch manifold, better exhaust pipe and silencer, etc, only added about 33% to the power. If you are lucky the average 'stage 1' kit will add about 10%
Another factor is that the later Minis have increased drag caused by the wheel arch extensions, those huge mirrors and the wider tyres which increase both the aerodynamic and the physical drag. The original cars had no wing mirrors as standard and narrow 3.5" wheels with 145 width tyres (well 5.20 x 10 on the pre-64 cars). That must make a lot of difference and I'm guessing here, but I reckon an 850 with very wide wheels and tyres plus those wide wing mirrors would be pushed to achieve 65 mph.
Then there is the issue of the gearing. If you modify the engine to give more top end power, the power band moves higher, so you need lower gearing to enable the car to pull into the max power area in top gear if it's max speed you are after. If, for example, you modified an MPI so that it gave 95 bhp at, say, 5700 rpm, with standard gearing you would never get there due to the sharp rise in drag before the engine came into the optimum power band.

[RossKnight]

My mini went off the speedo within a few meters... 998 that is no-where near tuned and completely standard

It was sheet ice and we were going up a steep hill...

Edited by RossKnight, 03 January 2011 - 01:47 PM.

[Carlos W]

I had to go out and do a little test


out onto the autobahn that is

sorry about the dodgy picture, those autobahns are very bumpy

But did you have a sat nav or something showing how fastyou were actually going?

[mikey72]

I had to go out and do a little test


out onto the autobahn that is

sorry about the dodgy picture, those autobahns are very bumpy

Best get that fixed, the needles fallen off your speedo there.

[Wil_h]

haha very good. have you got the rpm, wheel size and final drive ratio?

[Timty]

My 998 89 mini does 80 ish but its screaming Slow down pleeeeze! when i drive on the motorway my wing mirror wobbles when i hit bang on 70 its more accurate than my speedo!

[starletman]

I have a relatively fit 1000 and down hill it will manage about 95.Even with a stage 1 i would not expect more than a 100.If your after top speed then you need an engine that revs as mins are short geared.

Are you sure your speedo isn't in KMH?

Its a big hill.

[Shifty]

I have a relatively fit 1000 and down hill it will manage about 95.Even with a stage 1 i would not expect more than a 100.If your after top speed then you need an engine that revs as mins are short geared.

Are you sure your speedo isn't in KMH?

Its a big hill.

Have they moved Snowden to Wiltshire then?