[jonnyc]

Hey!

I have a new Cooper and was wandering if anyone has fitted a M7 throttle body (or any other aftermarkey throttle body) to there One Cooper or Cooper S, and if there was any diffrence with power, throttle response, sound etc etc???

Cheers

JonnyC

[Paul]

Not sure about the M7 specificially, but there's a number of people on here who have either replaced or modified their throttle bodies. Try a search for some previous threads too.

[Cooper_si]

Quote: Originally Posted by jonnyc

Hey!

I have a new Cooper and was wandering if anyone has fitted a M7 throttle body (or any other aftermarkey throttle body) to there One Cooper or Cooper S, and if there was any diffrence with power, throttle response, sound etc etc???

Cheers

JonnyC

The MC really benefits from using the bigger TB as it has a very restrictive intake route.
With that said adding a software package will add in making power, improve throttle
response and more. The M7 TB has shown to make 3-5HP on every car it's been installed on.

Simon

[supercharged99]

i got a M7 throttle body on my cooper S , and yeah ,there is a vast differance in the pick up.also get to 130 mph (shhhhh...) in the same time i got to 110 mph

[jonnyc]

On a private road aye...

Coool, well thats kinda what i wanted to hear, think i mite b investing in one of those...

Anyone else with experience of enlarged throttle body's, i would love to hear more about what you think...

Cheers for the feedback

JonnyC

[Revolution Mini Works]

Quote: Originally Posted by Cooper_si

The MC really benefits from using the bigger TB as it has a very restrictive intake route.
With that said adding a software package will add in making power, improve throttle
response and more. The M7 TB has shown to make 3-5HP on every car it's been installed on.

Simon

Not sure where you heard that. On independent testing all TB's made 1-2 whp maximum

[obehave]

Quote: Originally Posted by Kumho Kid

Not sure where you heard that. On independent testing all TB's made 1-2 whp maximum

Not sure where you heard that. That very much depends on the motor.

[Revolution Mini Works]

Quote: Originally Posted by obehave

Not sure where you heard that. That very much depends on the motor.

Not only have I heard it, I have seen it. Most of the TB's cause dead spots in the RPM band around 2800-3200 range after they have been modified. Mine has the same problem.

[jonnyc]

Do you have your throttle body on a Cooper or S???

Have you had a re-map to suit?

Cheers

JonnyC

[Cooper_si]

Quote: Originally Posted by Kumho Kid

Not sure where you heard that. On independent testing all TB's made 1-2 whp maximum

Information is straight from M7 themselves...of course

[soopacoopa]

Quote: Originally Posted by Kumho Kid

Not only have I heard it, I have seen it. Most of the TB's cause dead spots in the RPM band around 2800-3200 range after they have been modified. Mine has the same problem.

This is quite interesting. I have just had quite a bit of tuning work done on my MINI including a big-bore TB, and whilst it goes like stink at high throttle angles, it does have an annoying flat spot between 2700 - 3500 at part throttle.

When you say 'most' TB's cause dead spots, where are you getting your information from, as I would like to investigate the subject more.

Cheers, Richard

[Cooper_si]

Quote: Originally Posted by soopacoopa

This is quite interesting. I have just had quite a bit of tuning work done on my MINI including a big-bore TB, and whilst it goes like stink at high throttle angles, it does have an annoying flat spot between 2700 - 3500 at part throttle.

When you say 'most' TB's cause dead spots, where are you getting your information from, as I would like to investigate the subject more.

Cheers, Richard

Have u had a remap richard? ....Ive also seen another MINI with a flatspot around that rev area and all that had was a gtt airfilter and a removed silencer..had no other mods.

I know very very large throttle bodies cause problems with idle running...and with M7 sized ones they got round this with a velocity stack cut opening from 65mm to 62mm at the butterfly.

Hope this helps

Simon

[supercharged99]

no flat spots at all on my MINI.

if so , it probably would have gone back...

nothing worse than a modded MINI playing up.

[roland2003]

Guys If you machine a taper from 65mm (velocity stack,in this thread) you will end up with a step where the hose connects at the top also if there is a taper at the bottom you get a step there. As it happens 63mm bored through gives a perfect continuation of the hose ID into the TB and into the the plastic SC inlet plenum after (beneath) the TB.
In effect at WOT the whole assembly is a near perfect 63mm bore tube,no steps ,this will
always give best flow. We have produced 62& 63mm TBs.,and there is no noticable difference in drivability whatsoever,therefore 63mm is preferable In theory a large TB will always be a little more sensitive at part throttle than a small one,this is a small trade off for less pressure drop.&more power.Having a taper (velocity stack) will make absolutely no change (for better or worse) to a part throttle flat spot.Without doubt the most important thing is the precision engineering of the bore & butterfly . This includes choosing the correct closed angle for the butterfly & and running clearance.Im happy to show anyone all the above in the flesh
ps Simon theres no way that fitting a GTT re-route pipe &airfilter is going to create a low end stumble (if thats what your saying) . Low end stumble on all mcs's is the most common 'fault/trait' of all.
Regards Roland Gt Tuning Ltd

[soopacoopa]

Hi Simon,

Yes the car has been re-mapped to suit the specific modifications added.

The TB is 63mm diameter, and I believe that it is straight bored, but i'm not 100% on this.

There's a few things that I need to check first with regards to the flat spot. I've been advised to check for possible air leaks in the crank case breather system and/or intercooler rubber boots. I've checked the crankcase breather hose and it is very soft and probably on it's way out, so this may be influencing the air-metering. I've also been advised to replace the air temp/pressure sensor on the inlet manifold as a precautionary measure, as this may be faulty.

If this doesn't resolve the situation I may look at trying a standard TB to see if this has a positive affect.

Richard

[Revolution Mini Works]

Quote: Originally Posted by soopacoopa

Hi Simon,

Yes the car has been re-mapped to suit the specific modifications added.

The TB is 63mm diameter, and I believe that it is straight bored, but i'm not 100% on this.

There's a few things that I need to check first with regards to the flat spot. I've been advised to check for possible air leaks in the crank case breather system and/or intercooler rubber boots. I've checked the crankcase breather hose and it is very soft and probably on it's way out, so this may be influencing the air-metering. I've also been advised to replace the air temp/pressure sensor on the inlet manifold as a precautionary measure, as this may be faulty.

If this doesn't resolve the situation I may look at trying a standard TB to see if this has a positive affect.

Richard

the reason it is stumbling is because of the larger TB.
with more air flow it goes lean during the transition of the by pass valve closing
the only way to fix it is to add fuel in a piggy back system to richen it during part throttle accelerations. You then can lean out the car on the high end where it runs rich
After adding the system and tuning it we have found an extra 10hp in the cars on the high end, not to mention the dreaded stumble is gone

[Cooper_si]

Roland...you have a PM sir

[Cooper_si]

...can i also add that when i mentioned gtt, its not there products causing the flatspot...i was using that MINI as an example as it doesnt have a modded throttle body or modified ecu software.

Thanks

Simon