[BigShow300]

Spent another great day in the hands of 1320 doing some testing on my car to see what gains could be found swapping from:

• Alta V2 15% pulley to Alta V2 17% pulley
• Superchips Bluefin Map to Standard Mini Cooper S Map

My car is a Jan 2003 MCS with 41k miles and has the following engine mods:

• Janspeed Manifold with High Flow Cat
• Milltek Cat Back
• GRS Intercooler
• Alta V2 15% Pulley
• Facelift Supercharger (Teflon)
• Superchips Bluefin with custom Lohen map

Dyno Run 1 - 15% Pulley & Superchips Map

Power (bhp): 239.9

Dyno Run 2 - 17% Pulley & Superchips Map

Power (bhp): 242.6

Dyno Run 3 - 17% Pulley & Standard Map

Power (bhp): 239.6

The figures above prove that the 17% pulley gives more power than the 15% pulley so no surprise there (see first dyno graph below) but the Superchips map did throw up a big surprise.

If you look at the second dyno graph and compare where the power comes in using a 17% pulley with Superchips map versus a 17% pulley with standard map you'll see that the extra few bhp of the Superchips map comes in from 7.1k rpm to 7.4k rpm... !! Before that the standard map blitzes it on both power and torque!!

So in short is the Superchips Bluefin worth it??? In this case the answer would be a big NO!! Its not all about peak bhp, it's about how it delivers bhp and torque right through the rev range.

My thanks to Paul & Chris for helping me find even more useable power on the cheap.

15% vs 17% Pulley (Superchips Map)



Superchips vs Standard Map (17% Pulley)

[Rigsey]

Great write up

So are you sticking with the 17% for now?

[1320autos]

Quote: Originally Posted by Rigsey (original)

Great write up

So are you sticking with the 17% for now?

Too factual for me, I would like to know what it drove like, can you feel the difference of 12-14ftlb in a 2900lb car, how long did the process take of swoping pullies, pictures of the swop, video on the dyno, video off the drive afterwards and before.

At least he posted the dyno charts

[BigShow300]

Thanks Rigsey... yup 17% pulley it is for now, the only problem I have with the 17% is whether it will increase detonation on the long straight at Bedford but there is only one way to find that out. Other than that its all good.

[Hugo]

Thanks for Post. Looking to start tuning soon.

[BigShow300]

Quote: Originally Posted by 1320autos (original)

Too factual for me, I would like to know what it drove like, can you feel the difference of 12-14ftlb in a 2900lb car, how long did the process take of swoping pullies, pictures of the swop, video on the dyno, video off the drive afterwards and before.

At least he posted the dyno charts

Ok here you go:

The twisty roads that crisscross through open countryside near 1320 Auto's enable me to really stretch the little Mini's abilities. First thing you notice with a 240bhp Cooper S is there’s enough torque to tackle challenging roads with minimal cog-swapping, but the engine also revels in being stretched to its 7000rpm red line which is how I like to drive it, making maximum use of the sweet shifting 6-speed box. The incessant supercharger whine dominates aural proceedings, overruling the central twin pipes’ blare up to 4000rpm at which point the Milltek exhaust clears its throat and delivers the powerful baseline that proves to all around that this is no standard Cooper S.

However its not until you find a long stretch of open road that you realise what a mighty punch this car delivers, pulling so ferociously in every gear that you think its on a constant mission to head butt the horizon. 30-70 mph in second is dispatched in a supercar slaying 3.1 seconds with a delicious pop from the exhaust when time comes to select third and you'll be on the naughty side of 115mph before you even need to think about fifth.

But power is nothing without control and even without the later models limited slip diff the way in which 1320 have extracted this cars power coupled with one of the best front wheel drive chassis in the business ensures you can use every one of its 240 supercharged horses. Even in the tighter corners of the Cambridgeshire countryside the Mini resists under steer better than its 60 per cent front weight bias might suggest, it won’t arc its tail like a Clio however, instead it’ll keep you neatly on line, ready to deploy that extra power well before the next muddy apex. With the traction control disengaged, power can overcome grip mid-corner if you are too aggressive with the throttle, but otherwise the Cooper S feels impressively neutral and has excellent grip.

Agile handling, a superb-quality cabin and those stunning looks make the Cooper S a desirable package, but add 1320's performance knowhow to the mix and you've got a Cooper S that punches well above its weight.

[MINI-Morgan]

Great write up! And best of all the test that i have been wanting to see for ages! Good work guys!

[roland2003]

Good thread. It ties up exactly with what weve been saying all along.
Stock map is giving more power all the way to the (and above?) stock rev limit, 17% pulley also giving more power all the way than 15%..

[sef]

Great write-up... A very interesting read...

[1320autos]

Quote: Originally Posted by roland2003 (original)

Good thread. It ties up exactly with what weve been saying all along.
Stock map is giving more power all the way to the (and above?) stock rev limit, 17% pulley also giving more power all the way than 15%..

I hope that means that you now believe us when we say we only report what the dyno tell us good or bad Roland.

I must admit the intercooled 17% cars we've had in before really bowled us a swerve ball by not performing, CooperSlad was one, we eventually solved that mystery through someone elses purchasing parts of his car so we found out what that problem was and the other one which made very low numbers believed he had 230 anyway when the dyno said he didn't for whatever reason, unfotunatley you cant help everyone.

I was impressed with the difference the 17% made in the 30-70 test however I'm not quite happy with it at the autodrome.

We're very lucky at the moment to have customer like Ben who are competitive and want to see what difference each component makes.

I think March may be the month when we all go "how much torque / horsepower":

[MINI-Morgan]

Quote: Originally Posted by 1320autos (original)

I think March may be the month when we all go "how much torque / horsepower":

How much do you go to the pub?? I know how much of each i'd like so I dont get creamed by diesels all the time........

[alski]

Quote: Originally Posted by BigShow (original)

Ok here you go:

The twisty roads that crisscross through open countryside near 1320 Auto's enable me to really stretch the little Mini's abilities. First thing you notice with a 240bhp Cooper S is there’s enough torque to tackle challenging roads with minimal cog-swapping, but the engine also revels in being stretched to its 7000rpm red line which is how I like to drive it, making maximum use of the sweet shifting 6-speed box. The incessant supercharger whine dominates aural proceedings, overruling the central twin pipes’ blare up to 4000rpm at which point the Milltek exhaust clears its throat and delivers the powerful baseline that proves to all around that this is no standard Cooper S.

However its not until you find a long stretch of open road that you realise what a mighty punch this car delivers, pulling so ferociously in every gear that you think its on a constant mission to head butt the horizon. 30-70 mph in second is dispatched in a supercar slaying 3.1 seconds with a delicious pop from the exhaust when time comes to select third and you'll be on the naughty side of 115mph before you even need to think about fifth.

But power is nothing without control and even without the later models limited slip diff the way in which 1320 have extracted this cars power coupled with one of the best front wheel drive chassis in the business ensures you can use every one of its 240 supercharged horses. Even in the tighter corners of the Cambridgeshire countryside the Mini resists under steer better than its 60 per cent front weight bias might suggest, it won’t arc its tail like a Clio however, instead it’ll keep you neatly on line, ready to deploy that extra power well before the next muddy apex. With the traction control disengaged, power can overcome grip mid-corner if you are too aggressive with the throttle, but otherwise the Cooper S feels impressively neutral and has excellent grip.

Agile handling, a superb-quality cabin and those stunning looks make the Cooper S a desirable package, but add 1320's performance knowhow to the mix and you've got a Cooper S that punches well above its weight.

point proven, you can write as well ben [ see mm review]

[Loui]

Quote: Originally Posted by 1320autos (original)

I hope that means that you now believe us when we say we only report what the dyno tell us good or bad Roland.

I must admit the intercooled 17% cars we've had in before really bowled us a swerve ball by not performing, CooperSlad was one, we eventually solved that mystery through someone elses purchasing parts of his car so we found out what that problem was and the other one which made very low numbers believed he had 230 anyway when the dyno said he didn't for whatever reason, unfotunatley you cant help everyone.

I was impressed with the difference the 17% made in the 30-70 test however I'm not quite happy with it at the autodrome.

We're very lucky at the moment to have customer like Ben who are competitive and want to see what difference each component makes.

I think March may be the month when we all go "how much torque / horsepower":

Can only think mine made more HP when we went back to 15% due to the crank pulley?

BTW std map back in mine an its as different again

[Fisher]

Can you do the same compare with 15% and 19% too?

I am really interested in that because most people outhere talking the power is bigger with 15% compare to 19%.

[BigShow300]

Funny you should ask as I spoke to Paul about this on Saturday but I personally feel that the 19% produces too much heat and in fact over revs the supercharger past its true limits.

SC spining at 14200rpm @6900rpm/engine with stock pulley.
With 15%, 17340rpm @6900rpm/engine.
With 17%, 17750rpm @6900rpm/engine.

Supercharger SC rev limit is 17200rpm so on the track I'll have to change up at 6000rpm!

[Fisher]

It will be interested to see it's that true about the heat.

If you need a pulley I can sponsor it no problem.

[MINI-Morgan]

I really am interested in the difference between Stock, 15%, 17% and 19% throughout the full power curve.

Also interesting which one would win 30-70 and 1/4 mile. My moneys on the 17% at the moment as the 19% might get too hot if you take it to the rev limit.

[BigShow300]

If everyone wants to club together and give 1320autos £180 I'll happily let them fit one on mine then dyno it, 30-70 & Pod it:...biggrin:... if I had the spare cash I'd do it as it would be a good to lay the figures on the above graph.

For the 15% I have 30-70 & 1/4 mile times with the bluefin map, so I'll re-install the bluefin and do a 30-70 & 1/4 mile time with the 17% as a comparison.

I'm with you though MM, I think it will just produce too much heat.

[Revolution Mini Works]

Quote: Originally Posted by roland2003 (original)

Good thread. It ties up exactly with what weve been saying all along.
Stock map is giving more power all the way to the (and above?) stock rev limit, 17% pulley also giving more power all the way than 15%..

you must have some bad tuning if a stock map makes more hp than a properly tuned custom map

[Jove]

Quote: Originally Posted by Revolution Mini Works (original)

you must have some bad tuning if a stock map makes more hp than a properly tuned custom map

He didn't say anything about a custom map! They are talking about off the shelve maps.