Acceleration Performance...help!! - MINI Cooper Forum

First Generation MINI Cooper S MINI Cooper S 2002 - 2006

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post #1 of 6 (permalink) Old Jun 8th, 2014, 02:31 AM Thread Starter
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Acceleration Performance...help!!

Hi All,

My MCS seems to be lacking in acceleration power when putting my foot down in low revs. 1st and 2nd seem to be ok but for example...if I am cruising at 3000rpm then floor it in 3rd... it seems to take a long time before I can feel that SC power/boost. I thought that with the SC the power should be there instantly, but I just don't seem to be getting it...or at least not all ?!

I have recently changed the Bypass valve to the DT valve which helped but not as much as I thought it would.
Also, I live in Japan and its getting very hot and humid here...would this have an effect on the performance?

looking for any feedback and pointers on where to look/ start to find what is resulting in this sluggish power!

Cheers and hope someone can help!
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post #2 of 6 (permalink) Old Jun 8th, 2014, 01:57 PM
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Hi ya

Have you done a reset on the ECM disconect the battery neg then poss leave it for 20 to 30 min re one t it poss then neg.

I would go over it and check your intercooler boots and bypass valve hose is ok, check all your vacuum hoses are ok to you map sensor and fuel pressure regulator.
Check your fuel pressure and regulator are ok

Have you got any mods fitted ?
Was the car ok before you fitted the bypass valve.
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post #3 of 6 (permalink) Old Jun 10th, 2014, 08:42 AM Thread Starter
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Hi Marque,

Thanks for your reply! Car was fine, but same as now before I changed the valve.

I did a ECU reset via the Speedo (holding in the button and turning key to first position etc) I shall disconnect the battery this weekend.

Boots looked ok when I did the valve change... any info what to look for? Same for the vacuum hoses, what should I be checking for? Good conditions and good air tight connections?

No Mods fitted, car is standard apart from the valve!

To check the fuel pressure and regulator...do I need to take the car to a shop or is it something I can do at home?

Thanks again mate
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post #4 of 6 (permalink) Old Jun 10th, 2014, 02:53 PM
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Hi ya

The reset from the IKE cluster does not work the best way is to disconnect the battery.

The sc boot you need to look and see if there in cold condition no spits or holes and they are fitted properly.

Vacuum hoses as in good condition not splits cracks or holes all the pipe work is tight in there, they get damaged easy and break with old age.

You will have to take it to the shop to get the fuel pressure and flow checked unless you have the special tools. It's easy to do if you have the tools.

When the car is running try to see if you can hear any air leaks from around the intercooler area.

Also check you supercharger belt there should be one hole just visible on the locking tang if not change the belt, they do stretch and do slip.

If you look at the picture you will see the twisted tang there is a locking pin installed in the last hole this hole should just be visible if it's not the belt needs to be changed

When was the car last serviced
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post #5 of 6 (permalink) Old Jun 12th, 2014, 11:58 AM Thread Starter
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Hey!

Thanks for the advice and information, I will take a look at the things I can this weekend and will try and get my car in to a shop to check the pressures soon!

Is it worth looking at running any cleaners through the fuel system? Injector cleaner for example? When I changed the BPV the throttle body looked quite dirty, is it worth cleaning?

Car was serviced when I bought it oil and filter changes etc..

Thanks for your information mate
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post #6 of 6 (permalink) Old Jun 12th, 2014, 05:11 PM
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Quote:
Originally Posted by DaveKay View Post
Hey!

Thanks for the advice and information, I will take a look at the things I can this weekend and will try and get my car in to a shop to check the pressures soon!

Is it worth looking at running any cleaners through the fuel system? Injector cleaner for example? When I changed the BPV the throttle body looked quite dirty, is it worth cleaning?

Car was serviced when I bought it oil and filter changes etc..

Thanks for your information mate
Hi ya

It's always worth checking the air filter and spark plugs.
A good fuel system cleaner is always worth while I use bg44k it's very good if you can get hold of it.
I would also replace your fuel filter. Even if it's not the problem it's well worth doing

http://www.billswebspace.com/MiniR50...erDIYGuide.htm

Throttle body is always worth cleaning if it's dirty :-)

Hope this helps
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