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      08-11-2021, 11:54 AM   #23
dradernh
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Originally Posted by scott_f22 View Post
Very nice build! I'm working on a similar spec on my 2015 m235i project. Do your brake calipers come close to rubbing the ID of your front 17x9 ET42 wheels? I'm seeing a very slight rub on my wheels. I wouldn't think the m240i calipers would be smaller than the earlier m235i but I could be mistaken...
The blue Brembos didn't contact the 17X9 ET42 Apex ARC-8s, and I don't recall the two being especially close to one another.

AFAIK, slight rubs are generally handled by grinding whatever's necessary off of the caliper, but I'm no expert when it comes to issues like that. Shops fix those sorts of things for me.

hth
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      12-07-2023, 08:19 AM   #24
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Great build, read and thread.

Have you still retired from track driving for good? What's going on with the car now? I'm also very interested in how that wavetrack diff works.
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      12-07-2023, 10:50 AM   #25
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Originally Posted by AmuroRay View Post
Great build, read and thread.

Have you still retired from track driving for good? What's going on with the car now? I'm also very interested in how that wavetrack diff works.
Yup, I'm retired from the track for good.

I use the car for an occasional road trip and local backroads drives. I won't modify it any further. When I think about replacing it, I go back and forth about putting it back to stock prior to sale.

The Wavetrac has worked well for me; it's functioned reliably, and with the solid rear subframe bushings, the rear-end hooks up just the way I needed it to.
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TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
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      12-07-2023, 11:07 AM   #26
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Quote:
Originally Posted by dradernh View Post
Yup, I'm retired from the track for good.

I use the car for an occasional road trip and local backroads drives. I won't modify it any further. When I think about replacing it, I go back and forth about putting it back to stock prior to sale.

The Wavetrac has worked well for me; it's functioned reliably, and with the solid rear subframe bushings, the rear-end hooks up just the way I needed it to.
I absolutely respect that, do you mind sharing what into that(retirement)? What was your prior track experience? I see you had the E36 - I'm assuming that was the race car?
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      12-07-2023, 11:34 AM   #27
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I absolutely respect that, do you mind sharing what into that(retirement)? What was your prior track experience? I see you had the E36 - I'm assuming that was the race car?
Just aged-out of it, really. I'd done all that I'd wanted to with time-trialing, driving, and instructing. I'm in my mid-70s now and knew before I bought the car in 2018 that I would only do a few events, mostly for old-times sake.

My first track experience was on a built street bike in the late 60s. That lasted a couple of years. I went back to it with cars from 2009-2013, averaging 25-30 days each year. I was old enough that falling off bikes at speed was no longer an option. A bike would have been dramatically less expensive, though.

Most of the car driving was in the E36 race car – an all-out professional build Cup car that won a pro-am championship in, IIRC, 1996 or 1997.
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TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
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      12-07-2023, 11:55 AM   #28
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Quote:
Originally Posted by dradernh View Post
Just aged-out of it, really. I'd done all that I'd wanted to with time-trialing, driving, and instructing. I'm in my mid-70s now and knew before I bought the car in 2018 that I would only do a few events, mostly for old-times sake.

My first track experience was on a built street bike in the late 60s. That lasted a couple of years. I went back to it with cars from 2009-2013, averaging 25-30 days each year. I was old enough that falling off bikes at speed was no longer an option. A bike would have been dramatically less expensive, though.

Most of the car driving was in the E36 race car – an all-out professional build Cup car that won a pro-am championship in, IIRC, 1996 or 1997.
Last question (and thank you for sharing so far) did you feel a drop off in your abilities as you aged, especially in driving?

And I want to do more - more seat time, more events, etc etc - but the way the world is moving, who knows what will happen.
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      12-07-2023, 03:28 PM   #29
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Quote:
Originally Posted by AmuroRay View Post
Last question (and thank you for sharing so far) did you feel a drop off in your abilities as you aged, especially in driving?

And I want to do more - more seat time, more events, etc etc - but the way the world is moving, who knows what will happen.
The principal drop-off was due to the lack of seat time. While I instructed from 2014-2017, it was in students' cars and never at any significant speeds.

When I got back on the track in 2018 in my own car, two things were immediately apparent: 1) in the sense that it's a sport, I was very rusty from four years off; and, 2) the soft 3,432# M240i was so different from the very stiff / everything-happens-right-now 2,708# race car that I was afraid to push the newer car fast right out of the box.

I got past those initial reactions but never developed the confidence in the M240i that I'd had in the E36. Once I ran a fast lap at Mid-Ohio that I didn't think I'd improve upon without running faster rubber or taking more risk than I wanted to, I decided to stop. There was nothing left that I wanted to do.

As far as seat time goes, I always could have used more karting time and more autocross time, but I was living in a rural area and generally found those events too far away to be convenient. Except for a four-day rally school I attended, they were where I developed the car control skills that made my track driving both safer and faster.

Good luck to you!
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TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
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      12-07-2023, 03:36 PM   #30
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Quote:
Originally Posted by dradernh View Post
The principal drop-off was due to the lack of seat time. While I instructed from 2014-2017, it was in students' cars and never at any significant speeds.

When I got back on the track in 2018 in my own car, two things were immediately apparent: 1) in the sense that it's a sport, I was very rusty from four years off; and, 2) the soft 3,432# M240i was so different from the very stiff / everything-happens-right-now 2,708# race car that I was afraid to push the newer car fast right out of the box.

I got past those initial reactions but never developed the confidence in the M240i that I'd had in the E36. Once I ran a fast lap at Mid-Ohio that I didn't think I'd improve upon without running faster rubber or taking more risk than I wanted to, I decided to stop. There was nothing left that I wanted to do.

As far as seat time goes, I always could have used more karting time and more autocross time, but I was living in a rural area and generally found those events too far away to be convenient. Except for a four-day rally school I attended, they were where I developed the car control skills that made my track driving both safer and faster.

Good luck to you!
Thank you for the well wishes and for taking the time, you're a wealth of knowledge and experience.
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      12-08-2023, 07:36 AM   #31
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I noticed you also have a 2017 M240i with a wavetrac. I contacted diffsonline and they said my 2017/04 couldn't get one. What month was your M240i produced?
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      12-08-2023, 12:03 PM   #32
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I noticed you also have a 2017 M240i with a wavetrac. I contacted diffsonline and they said my 2017/04 couldn't get one. What month was your M240i produced?
My car was built in May, 2017.

What reason did diffsonline give you for not selling you a Wavetrac?
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      12-08-2023, 12:05 PM   #33
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Originally Posted by dradernh View Post
My car was built in May, 2017.

Is your car an xDrive?
Nope. thats pretty interesting though. So your car came with the 2.81 final drive ratio right?
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      12-08-2023, 12:07 PM   #34
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Nope. thats pretty interesting though. So your car came with the 2.81 final drive ratio right?
No, 3.08.

What reason did diffsonline give for not selling you a Wavetrac?
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TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
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      12-08-2023, 12:11 PM   #35
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ah so this confirms it then, pre 06/2017 models have a 3.08 while post have a 2.81. Dan told me that there was no wavetrac option for the 3.08 due to it being a 205mm unit and wavetrac doesn't make one for that sizing which is true. I wonder if the wavetrac unit that you have is the same one meant for the m235i since the m240i is known for having a 2.81 ratio in the rwd models.
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      12-08-2023, 12:17 PM   #36
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Quote:
Originally Posted by Dom147 View Post
ah so this confirms it then, pre 06/2017 models have a 3.08 while post have a 2.81. Dan told me that there was no wavetrac option for the 3.08 due to it being a 205mm unit and wavetrac doesn't make one for that sizing which is true. I wonder if the wavetrac unit that you have is the same one meant for the m235i since the m240i is known for having a 2.81 ratio in the rwd models.
Working off a fuzzy memory here...IIRC, the 2.81 went into auto trans cars and the 3.08 into manual trans cars.

I'm certainly no expert in these matters, though, while Dan is the man when it comes to BMW diffs.
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TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
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      12-08-2023, 12:21 PM   #37
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Quote:
Originally Posted by dradernh View Post
Working off a fuzzy memory here...IIRC, the 2.81 went into auto trans cars and the 3.08 into manual trans cars.

I'm certainly no expert in these matters, though, while Dan is the man when it comes to BMW diffs.
ahhhh thats right. I totally forgot about that. I'm an automatic...

this was embarrassing. Always a pleasure talking to you though dradernh!
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