19% pulley reduced rev limit to 6,200rpm

[mobile23]

just read a magazine called "Roundel" (nov. issue)..... it mentions about upgrade supercharger with 19% pulley requires the engine rev limit be reduced to 6,200rpm. is that true? so what about 15% and 17% pulley??

[erichui]

Quote: Originally Posted by mobile23

just read a magazine called "Roundel" (nov. issue)..... it mentions about upgrade supercharger with 19% pulley requires the engine rev limit be reduced to 6,200rpm. is that true? so what about 15% and 17% pulley??

15% is fine.
not sure about 17%
if u do a search u should be able to find lots of answers.
the main reason being the supercharger will over rev if it rev more than that certain revs you will be risking of damaging ur charger. with the 15percent even spining at the factory redline (or alittle higher i believe) it is still within the spec of the charger, so it would be fine....
(i am just posting for what i know)

[RickB]

My understanding, as well; you will over-rev the supercharger if you fit a 19% pulley and run the engine to redline. The JCW kit has a reduction pulley and a raised redline, but the supercharger itself is modified for the higher revs/heat.

[mobile23]

thanks. so 15% is the problem-free pulley upgrade, right?

[AvatarX]

Check this out: http://www.mini-works.com/tech.html

According to RDR, the 19% puts the Eaton SC right at its rev limit so that's actually the sweet spot.

AvatarX

[The_Bster]

Quote: Originally Posted by AvatarX

Check this out: http://www.mini-works.com/tech.html

According to RDR, the 19% puts the Eaton SC right at its rev limit so that's actually the sweet spot.

AvatarX

Thing is, how long will the engine last at that sweet spot. I believe the tolerances that car manufacturers set is also for longevity in the wear and tear department.

[Paul]

Quote: Originally Posted by RickB

The JCW kit has a reduction pulley and a raised redline, but the supercharger itself is modified for the higher revs/heat.

JCW red line isn't changed.

[obehave]

Quote: Originally Posted by AvatarX

Check this out: http://www.mini-works.com/tech.html

According to RDR, the 19% puts the Eaton SC right at its rev limit so that's actually the sweet spot.

AvatarX

rev limit does not = sweet spot

[Bisch]

Quote: Originally Posted by obehave

rev limit does not = sweet spot

I can tell you what it does equal.....











$

[bkwalker]

Quote: Originally Posted by mobile23

thanks. so 15% is the problem-free pulley upgrade, right?

meant to be from what i read on MINI2, the supercharger still has a 100% life span up to a 16% pulley..

im getting my pulley soon and cant wait! hope it is as explosive as everyone claims

[kyriian]

if 16% and it still retains the 7000 rpm limit, then i'd think a 17% can still go 7k, but you'd be pushing it far... i'd think 6700 would be my upper limit if i had a 17%

[obehave]

Quote: Originally Posted by Bisch

I can tell you what it does equal.....











$

Hot spot maybe

[enzothemaddog]

Its 6500 not 6200.
+ if you're putting a 19% pulley in, you should be prepared for higher temps. Although you wont get 100% life out of the engine, its still close to that mark with the 19%. Dont forget, these engines are almost bulletproof. If you're a pansy, keep a stock Mini and dont bother tuning.

[Ryephile]

19% pulley on the M45 at 7,500 engine RPM - now that is pushing it

[norm03s]

Quote: Originally Posted by kyriian

if 16% and it still retains the 7000 rpm limit, then i'd think a 17% can still go 7k, but you'd be pushing it far... i'd think 6700 would be my upper limit if i had a 17%

Nah, the stock rev limiter @ 6,800 works great on track when paying attention to all the other stuff. I try and shift just before it kicks in when I'm winding it out. just for the pleasure of it..
I will tell you it is really pulling nicely at 6,800 and feels like it wants to rev much higher but the limitation is the valve train primarily the lifters. Therefore I don't intend to make any changes that would allow me to exceed 7,000 RPM.