Altaran's weight reduction journey

[heinzboehmer]

Nice! That's definitely on the list when I do this next time.
How did you make dry ice work with the mats that are on a vertical surface?

Nothing fancy really, just used what I could to get it as close as possible to them. Use a lot of it, push it up against the mats with some wood, tape it on, etc.

There are definitely some parts where you have to bust out the heat gun, but you can get the majority with dry ice.

[Nate047]

Awesome man. Must be so fun!

Can you tell me about how you repaired the floor rust in that area behind the front seats? I have that same problem around those drain holes, and that is right where my roll bar will mount so I need to make sure it's solid. My plan in a nutshell is to kind of bore out the crusty rusty area, put rust inhibitor so it stops the rust from spreading, and have someone weld plates underneath the car. I would be interested in hearing how you did that since your approach to everything is very thorough.

How do you like the motorsport MK60 ABS? Can you give a review of how it feels from the driver's seat vs the stock MK20 system? I have this project kind of looming in front of me, and I don't know the best way to approach things for my needs. When I had my whole rear end off the car to do the RACP, I saw that my rear brake pipes are somewhat crusty, but functional. So I'm torn between saying fuck it and leaving them alone and doing the whole swap the easy way, or dropping the rear end and fuel tank again, running new pipes and moving the module to the factory MK60 location.

I have a normal MK60 module and I don't necessarily plan on changing that to a motorsports unit, but I am not against it and in fact I'm really curious to hear an honest review of how the setup works, what the cost was, and if you think it's worth it or not. I do not car about DSC or lights on the dash lol.

[Hammerfang]

Impressive results.

What are some of the easiest and reversible ways to loose weight?

[Gt4]

What brand is the CF driveshaft?

[EthanolTurbo]

What brand is the CF driveshaft?

OEM F80 M3 driveshaft.

[heinzboehmer]

Impressive results.

What are some of the easiest and reversible ways to loose weight?

Seats, battery, wheels

[Altaran]

Awesome man. Must be so fun!

Can you tell me about how you repaired the floor rust in that area behind the front seats? I have that same problem around those drain holes, and that is right where my roll bar will mount so I need to make sure it's solid. My plan in a nutshell is to kind of bore out the crusty rusty area, put rust inhibitor so it stops the rust from spreading, and have someone weld plates underneath the car. I would be interested in hearing how you did that since your approach to everything is very thorough.

How do you like the motorsport MK60 ABS? Can you give a review of how it feels from the driver's seat vs the stock MK20 system? I have this project kind of looming in front of me, and I don't know the best way to approach things for my needs. When I had my whole rear end off the car to do the RACP, I saw that my rear brake pipes are somewhat crusty, but functional. So I'm torn between saying fuck it and leaving them alone and doing the whole swap the easy way, or dropping the rear end and fuel tank again, running new pipes and moving the module to the factory MK60 location.

I have a normal MK60 module and I don't necessarily plan on changing that to a motorsports unit, but I am not against it and in fact I'm really curious to hear an honest review of how the setup works, what the cost was, and if you think it's worth it or not. I do not car about DSC or lights on the dash lol.

I had a professional chassis builder fix it. The driver side was still good enough to be fixed by grinding off the rust. The passenger side hat to be cut out and replaced. He used a metal sheed and bent it to have the same contoure as stock and ground the welds so they're less visible. So other than the new underfloor finish, you would not recognize that this was welded in.

The motorsport ABS is essentially only different software. You can get it flashed into any MK60 Ecu that is flashable (like CSL). The standalone units are usually based on flashable e90 units, as those are cheap to come by unlike the E46 CSL units. Thats why DSC doesn't work. In your case the easiest thing would be to get a flashable e46 unit as it would be plug and play from your existing unit. Since I converted from MK20, I had to go the long way anyways.

I have not tracked yet, but from road testing its quite notieable how much later the ABS starts interfering. Considering stock ABS software is programmed for a 1,6 ton car with full accessories, early 2000s suspension, and tire setup, its obvious there's some room to be gained with modified cars. When getting the software done, you specify your car's parameters so its specifically tailored to your car. The ABS interaction is also harder, but this is a choice. There is one pin on the connector which is used as a ground switch. When activated the ABS interaction becomes smoother, which is better for road users. For track/race usage, you want to feel the ABS kick in so you get a feeling how much braking you can do without starting to loose traction.

[Altaran]

OEM F80 M3 driveshaft.

That. Mine was built to fit E46 by "Elbe Gelenkwellen Service".

[Mike RT4]

I've started following you on Instagram - can you post up details of your front end suspension components and your reasoning behind the switch ?

[Gt4]

With this wheel gap, I think I removed some weight so far!

[Track Widow]

This is really badass! Nice work and detailed build specs!


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[D-O]

The motorsport ABS is essentially only different software. You can get it flashed into any MK60 Ecu that is flashable (like CSL). The standalone units are usually based on flashable e90 units, as those are cheap to come by unlike the E46 CSL units. Thats why DSC doesn't work. In your case the easiest thing would be to get a flashable e46 unit as it would be plug and play from your existing unit. Since I converted from MK20, I had to go the long way anyways.

My 2003 does have an MK60. How would I determine if it is flashable?

[Altaran]

My 2003 does have an MK60. How would I determine if it is flashable?

There's a thread on bimmerforums on it:

https://www.bimmerforums.com/forum/showthread.php?2304811-MK60-ABS-Standalone-info

As far as I was aware, only the CSL and the comp package cars have flashable units.

Best way is to note your part number (on the underside of the ABS ECU) and ask whoever will reflash yours if it's doable. It's not possible to diy this anyways, unless you have a lot of experience in setting abs software values...

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[Altaran]

With this wheel gap, I think I removed some weight so far!

Nice progress getting those mats out and the surface clean! Though I still see a lot of wires that need to go 😜

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[Altaran]

I've started following you on Instagram - can you post up details of your front end suspension components and your reasoning behind the switch ?

There's pics of all the components up on insta, I tagged the manufacturers in the description.
The reason for the dampers is performance. They have the shortest reaction time on the market (0,5mm stroke to build up full damping afaik).
The aftermarket control arms and toe arms are:
- correct bumpsteer, which happens more on lowered cars due to different arm angles
- better overall adjustability: each rod can be adjusted as well as the strut mounts. This is not only camber and caster, but also position of the wheel relative to the car. Front wheels can be pushed out to the front (1cm or so depending on your wheels) thereby increasing wheel base and improving handling.
- lightweight: all parts are forged aluminum (grade 7075) and considerably lower weight than stock.

Generally it's possible to convert to full monoball with stock control arms. So if you are going for a milder setup retaining factory kinematics, this may be easier. Generally speaking more adjustability means also more ways to screw up the setup 😉

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