Drivetrain Considering these mods

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Jan 22, 2007 | 07:48 PM

#26

n1ftyneil

3rd Gear

Joined: Dec 2006

Posts: 252

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From: Orange County, California

this has turned into a very good and informative thread - cheers lads for the help

Jan 22, 2007 | 10:16 PM

#27

ChrisO

1st Gear

Joined: Nov 2006

Posts: 38

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From: Lafayette, CA

Okay, like vector625, I am looking to make the same modifications with almost the same parts.

Where would you recommend we purchase the parts, with cost being the major factor?

ChrisO

Jan 23, 2007 | 03:29 AM

#28

dmh

Former Vendor

Joined: Mar 2006

Posts: 1,135

Likes: 0

From: Metro NY

Quote:

Originally Posted by RedSkunk

What are you saying the (long-term?) negative effects of a short shift kit are, then? Even like the Helix unit that attaches onto the existing bits and only reduces throws 20%?

This topic was brought up at a seminar I was attending with David Murray (Nissan factory driver for 2007) and some Weissach techs (Porsche) over the weekend in Sebring. It helps to understand how a gearbox with synchos works. And if you do you already know why short shifters are a poor idea for a street style gearbox. Basically, by speeding up the shifting you loose the ability of the sychros to work properly. And damaged synchros can get pricey to fix.

You do not need a clutch to engage first gear in a stock box. Gently push on the lever and it will engage. Do it with a short shifter and the gear grinds. I test all the cars I drive in this manner.

Why they are bad for a track car is the above and the fact that finding the return gate, 3-4, becomes difficult and that can and does lead to missed shifts; especially in corners where your body weight is going one direction and the car is going the opposite.

Jan 23, 2007 | 09:58 AM

#29

vector625

Thread Starter

1st Gear

Joined: Feb 2004

Posts: 14

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Quote:

Basically, by speeding up the shifting you loose the ability of the sychros to work properly. And damaged synchros can get pricey to fix.

So it sounds like short shifters are bad. Has anyone had bad experiences with theirs? Can this be countered by shifting slowly through the gears and only doing it quickly when "needed? Just not sure if I'll be doing real damage or not.

Jan 23, 2007 | 10:23 AM

#30

1nf3rn0

6th Gear

iTrader: (2)

Joined: Apr 2005

Posts: 6,731

Likes: 3

Alot of people have short shifters on their cars with over 100k miles on their transmissions. While It might be a problem in the long, long run, i doubt it will effect you... Hell, as fast as i shift with my stock shifter, it probably isn;t good for my transmission...

Quote:

Originally Posted by vector625

Jan 23, 2007 | 10:34 AM

#31

MGCMAN

6th Gear

Joined: Jul 2002

Posts: 4,293

Likes: 2

From: Cincinnati, Ohio

Quote:

Originally Posted by vector625

I haven't done any mods to my 2004MCS, but I'm making a list that I want done sometime in the next month-or-so. I don't have any hard requirements other than I want to feel a real difference after they are done. Reading what everyone else had to say, I figured somewhere around 200HP (crank) is what I'd shoot for, but that's just a rough guess. Here's what I figured I'd add:

1) Cold Air Intake (not sure which one, yet)
2) 15% pulley
3) Miltek exhaust
4) GIAC ECU
5) Short shifter (B&M)

I wanted to get some opinions on this selection. Anyway just wanted to see what people had to say.
-v625

Vector,

I have similar mods (among others). I have the Alta CAI, the 15% pulley also Alta, a Scorpion cat-back exhaust, a UNICHIP ECU, and a Cravenspeed Short shifter. I recently dynoed my car at 170 whp, which translates at a 20% loss through the drivetrain at about 205 crank hp. I think you're spot on with your assessment as to what to expect with those mods. BTW, DO IT!!!