Drivetrain Uprating Internals
2nd Gear
Joined: Jun 2018
Posts: 60
Likes: 4
From: Houston tx USA
lol I can't even get mad at you bro.
2nd Gear
Joined: Jun 2018
Posts: 60
Likes: 4
From: Houston tx USA
MCS have weaker pistons and ringlands vs JCW (JCW can support ~300hp @ crank in stock form).. I would at least be looking to get a good set of forged pistons, along with ARP rod-bolts and head studs. If you had $$$ in your budget still.. +42mm turbo or WMI would be a real good addition.
*blown pistons before a tune are likely carbon related (rings get caked up, scrape/stuck/fail) due to poor maintenance
*blown pistons after a tune could be from the same.. but more likely caused by too much timing and not enough octane.
*blown pistons before a tune are likely carbon related (rings get caked up, scrape/stuck/fail) due to poor maintenance
*blown pistons after a tune could be from the same.. but more likely caused by too much timing and not enough octane.
6th Gear
Joined: Mar 2011
Posts: 1,945
Likes: 203
From: Northern NV
300HP at the crank (BHP) is quite a bit less at the wheels (WHP), as measured on most USA dynos. If you go for 300 - 350WHP you should plan on doing the internals.
Also, I question Cornjuice's statement about MCS vs JCW pistons. The only OEM difference I'm aware of is the compression ratio --- 10.5:1 for MCS and 10.0:1 for JCW. Lower compression is preferred for high, sustained boost, and should last longer. If you go for a forged set, look at CP Carrillo, they have a good variety off-the-shelf, and will do customs for about the same price.
Also, I question Cornjuice's statement about MCS vs JCW pistons. The only OEM difference I'm aware of is the compression ratio --- 10.5:1 for MCS and 10.0:1 for JCW. Lower compression is preferred for high, sustained boost, and should last longer. If you go for a forged set, look at CP Carrillo, they have a good variety off-the-shelf, and will do customs for about the same price.
2nd Gear
Joined: Jun 2018
Posts: 60
Likes: 4
From: Houston tx USA
300HP at the crank (BHP) is quite a bit less at the wheels (WHP), as measured on most USA dynos. If you go for 300 - 350WHP you should plan on doing the internals.
Also, I question Cornjuice's statement about MCS vs JCW pistons. The only OEM difference I'm aware of is the compression ratio --- 10.5:1 for MCS and 10.0:1 for JCW. Lower compression is preferred for high, sustained boost, and should last longer. If you go for a forged set, look at CP Carrillo, they have a good variety off-the-shelf, and will do customs for about the same price.
Also, I question Cornjuice's statement about MCS vs JCW pistons. The only OEM difference I'm aware of is the compression ratio --- 10.5:1 for MCS and 10.0:1 for JCW. Lower compression is preferred for high, sustained boost, and should last longer. If you go for a forged set, look at CP Carrillo, they have a good variety off-the-shelf, and will do customs for about the same price.
Banned
Joined: Sep 2017
Posts: 442
Likes: 38
From: NCAL
300HP at the crank (BHP) is quite a bit less at the wheels (WHP), as measured on most USA dynos. If you go for 300 - 350WHP you should plan on doing the internals.
Also, I question Cornjuice's statement about MCS vs JCW pistons. The only OEM difference I'm aware of is the compression ratio --- 10.5:1 for MCS and 10.0:1 for JCW. Lower compression is preferred for high, sustained boost, and should last longer. If you go for a forged set, look at CP Carrillo, they have a good variety off-the-shelf, and will do customs for about the same price.
Also, I question Cornjuice's statement about MCS vs JCW pistons. The only OEM difference I'm aware of is the compression ratio --- 10.5:1 for MCS and 10.0:1 for JCW. Lower compression is preferred for high, sustained boost, and should last longer. If you go for a forged set, look at CP Carrillo, they have a good variety off-the-shelf, and will do customs for about the same price.
From my experience speaking with tuners/builders: They have all told me the same "MCS internals are weak, and for whatever reason the ringlands fail at a much higher rate vs. JCW."
6th Gear
Joined: Mar 2011
Posts: 1,945
Likes: 203
From: Northern NV
If we can trust the Bentley manual, page 010-15 (1st edition) shows the summary of changes for JCW. One of them is "Strengthened piston side faces, and adapted to a reduced compression ratio of 10.0." It also mentions a different head gasket, but in terms of heat distribution and coolant flow, not compression ratio.
So, apparently I stand corrected on piston materials. However, I'd still go for aftermarket pistons when targeting 300+ WHP.
So, apparently I stand corrected on piston materials. However, I'd still go for aftermarket pistons when targeting 300+ WHP.
2nd Gear
Joined: Jun 2018
Posts: 60
Likes: 4
From: Houston tx USA
If we can trust the Bentley manual, page 010-15 (1st edition) shows the summary of changes for JCW. One of them is "Strengthened piston side faces, and adapted to a reduced compression ratio of 10.0." It also mentions a different head gasket, but in terms of heat distribution and coolant flow, not compression ratio.
So, apparently I stand corrected on piston materials. However, I'd still go for aftermarket pistons when targeting 300+ WHP.
So, apparently I stand corrected on piston materials. However, I'd still go for aftermarket pistons when targeting 300+ WHP.
Thread
Thread Starter
Forum
Replies
Last Post
MINI Stupor
R50/R53 :: Hatch Talk (2002-2006)
3
Oct 1, 2015 11:36 AM