I know in the oldskool vw world decking heads for more power is very common, and the mini has a VERY low compresion ratio, even for a FI car. I think if we can achieve a 9:1 comp ration then some good gains should be seen. I'd expect at least 5hp on the top end and more torque in the lower end. What are your thoughts on this?

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03 MCS, MOMO ****, home brew CAI, modded intake pipe, A/F gauge, and H&R sport springs.
I like to do things differently :smile:

 

are you talking the mc or the mcs. What do you want to do with the car shoot n2o or ?

 

I'm talking about the MCS, sorry about the confusion. No i don't want to run N2O, i just want to have some more power. The MCS has a really low compresion ratio, and should be able to beffefit from a slightly righer ratio. If you look at the vw 1,8t its running over 9:1 compresion, and can still make over 300hp on a stock bottom end. Basicly, bumping the comp will fix part of our problem will lack of torque at lower RPMs.

 

I'm thinking it's not a good idea. I'm sure it would be quicker off of the line, but the MCS had the compression ratio reduced from the MC's specifically for the purpose of reliability. So personally I wouldn't mess with that. But then again, you like to do thinks differently...

 

The compression ratio was lowered on the MCS because of the supercharger. This is a common and necessary function due to the additional boost the SC gives. The SC gives an approximate 10 PSI boost, and the 15% pully brings it up to approximately 15 PSI.

 

Exactly. You have to consider your EFFECTIVE compression ratio - which, with regard to the MCS, is going to be MUCH higher when you're under boost. Though you certainly COULD gain some (though probably very little) compression by milling the cylinder head, you're inherently limited by piston/valve clearance and timing belt (though the latter can be dealt with easily). There's a REASON that MCS folks are going to route of the S/C reduction pulley - it's a HELL of a lot cheaper than headwork (both in terms of outright cost and time investment). If you want to put a new spin on making your S faster, you might want to concentrate more on losing unnecessary weight from the car. Just my 2 cents' worth.

Marty