MRF 4.2 e92 6speed

[6ixSpd]

Holy shit, this build sounds insane. I would love to read a detailed build thread outlining the journey of this M3 to it's current state.

What a dream.... 450rwhp revving to 8950 sounds like the perfect M3 drivetrain to me.

[SYT_Shadow]

I'd love to see a dyno sheet

[Richbot]

Originally Posted by InspireSiR

My car with a full tank of gas and zero options from the factory weighed in at 3,524 lbs. Would love to know how I can pull out another 300 lbs.

Wheels - 30-40lb depending on the wheel/tire setup
Light catless exhaust - 50lb (Akra evo comes close to this and isn't ridiculously loud, still "catted" and resonated)
Remove passenger seat - 60lb
Lifepo battery - even a "heavy" one like the big 9lb Voltphreaks drops nearly 50lb
Fixed back driver's bucket - 30lb or so, depends on your choices

That gets you real close to 3300 full tank, and none of that makes the car much worse as a street car Just saying there's a lot of quick weight loss available on these things, no idea what Malek's done. Those mirrors imply a lot of detail work to get the last ounces out...

[Hujan]

Such an amazing car. Seeing it is one of the best parts of any trip to MRF. And it definitely rips and revs!

[buddalun]

This is and the Schirmer cars are my favorites E92 M3s. By far.

Great work Malek@MRF

Vid:
https://www.facebook.com/mrfengineer...3941276292376/

[slicer]

The MRF car is truly epic. There are numerous build details that take it to a level that's beyond compare. From the motor build to the sub-frame modifications, suspension arms, interior details, lightening with minimal interior sacrifice, etc. There are lighter pure track cars but when it comes to building a capable car that is still steetable this is the benchmark IMO.

[Adrian g.]

Curious why the switch from AP to Brembo brakes? Larger rotors??

[slicer]

Originally Posted by Adrian g.

Curious why the switch from AP to Brembo brakes? Larger rotors??

He replaced an AP kit that I believe was from Stillen. Not an Essex AP kit which is a little more capable IMO. I don't think he would have made the change to a Brembo GT kit. He switched to a Brembo GTR kit and the rotors are actually a little smaller than the AP kit that he had.

[slicer]

Originally Posted by InspireSiR

My car with a full tank of gas and zero options from the factory weighed in at 3,524 lbs. Would love to know how I can pull out another 300 lbs.

I am at 3340 with DCT (no other options) and 1/2 tank of gas plus a 1/2 cage and rear seat delete (adds approximately 65 lbs while deleted seats were 70 lbs), plus rear wing, Varis diffuser, GTS lip, and CSF cooling all add back some weight.

Here's how you get there (I have been meaning to put a detailed thread together and will do so soon) -

Race Seats, Exhaust (Akra GT4 is the lightest option that I know of), Lithium Battery (Voltphreaks is about 8 lbs), sound deadening removal (everything behind front seats), Trunk liner removal, lightening of amp and com racks, wiper removal, washer tank removal, Burger Motorsports cabin filters, lighter brakes (Essex AP kit saves weight over stock), Lw wheels, and a bunch of other little things.

Malek's car is even lighter due to weight savings in the motor (his motor build saves significant rotational weight in motor), LW flywheel, manual trans is lighter than DCT, He uses harness bar - not a 1/2 cage, front sub-frame modifications and many other things I am forgetting. He has trunk liners in place and BMW Mini battery. His weight distribution is better than mine because more of the weight loss is towards the front of the car.

[InspireSiR]

Originally Posted by slicer

I am at 3340 with DCT (no other options) and 1/2 tank of gas plus a 1/2 cage and rear seat delete (adds approximately 65 lbs while deleted seats were 70 lbs), plus rear wing, Varis diffuser, GTS lip, and CSF cooling all add back some weight.

Wow, short of gutting your interior it sounds like everything that wasn't needed was strategically removed or lightened.

Curious about why you are running the Varis undertray then. I don't believe at the speeds these cars achieve on track that there is any aerodynamic advantage of having this diffuser. Granted, it probably is only 3-5 pounds at the most, but it seems like you've already gone through other extremes to reduce weight as much as possible.

Or do the aesthetics of this piece outweigh (no pun intended) the weight saving measures you've implemented?

[slicer]

Originally Posted by InspireSiR

Wow, short of gutting your interior it sounds like everything that wasn't needed was strategically removed or lightened.

Curious about why you are running the Varis undertray then. I don't believe at the speeds these cars achieve on track that there is any aerodynamic advantage of having this diffuser. Granted, it probably is only 3-5 pounds at the most, but it seems like you've already gone through other extremes to reduce weight as much as possible.

Or do the aesthetics of this piece outweigh (no pun intended) the weight saving measures you've implemented?

Great question. I think that the aerodynamic affect of the Varis is unknown. It's certainly very hard to measure. I am of the camp that it does improve the rear aero (based purely on logic) considering that without it there is an open cavity with the bumper acting as a bit of a parachute (especially with smaller exhaust like the Akrapovic that I use). I have thought about the weight penalty and debated whether I should keep it (unfortunately I didn't weigh it prior to install). That being said, it's a beautiful piece, likely improves the rear aero, and I have already removed a disproportionate amount of weight from the rear.

I am on the Karbonious intake group buy (saves 7 lbs up front) and could see myself getting a carbon hood in the future (approximately 10 lb weight savings). In addition, I may experiment with lightening of the carpet's foam backing. Plus I have plans to delete the folding door pockets. I sacrificed an extra door card to weigh the pocket and mechanism. It totals 2.5 lbs each side. I would need to fill the space with something (probably alcantara covered AL or Balsa Wood panel) which would add back 0.5 lb +/-. So another 4 lbs there. Lastly I have some lighter seats incoming from Japan. It's TBD whether they will fit properly. If so, I may be able to save another 30 lbs there (Cobra's are heavy). All of the above would get me below 3k lbs with full interior, 1/2 cage, all electronics / stereo, AC, etc. The only comfort sacrifices made are the extra sound present with reduced sound deadening and lack of wipers / washers. I don't see a problem with the wiper / washer delete in my climate. I literally used the wipers 3x with 2 of those instances being accidental bumping of the lever. My washer tank was nearly full and I have had the car for 3 years without ever filling.

[nycplumber]

Are you a fitness freak as well slicer?

[M3ANMACHINE]

Originally Posted by nycplumber

Are you a fitness freak as well slicer?

You're right, the driver should lose a few pounds also

[nycplumber]

Originally Posted by M3ANMACHINE

You're right, the driver should lose a few pounds also

I wasn't insinuating anything! Haha I'm fitness obsessed so I was asking for my own benefit lol.

[slicer]

Originally Posted by nycplumber

Are you a fitness freak as well slicer?

Not as much as I should be but I do prioritize taking care of myself.

[slicer]

Originally Posted by M3ANMACHINE

You're right, the driver should lose a few pounds also

You calling me fat bro!?!?

[Redd]

Slicer, IND has Challenge CF door cards that remove the folding pocket but retain all other hardware.

[TTony]

Originally Posted by Redd

Slicer, IND has Challenge CF door cards that remove the folding pocket but retain all other hardware.

And the IND Challenge CF Trunk...

[roastbeef]

Originally Posted by slicer

Great question. I think that the aerodynamic affect of the Varis is unknown. It's certainly very hard to measure. I am of the camp that it does improve the rear aero (based purely on logic) considering that without it there is an open cavity with the bumper acting as a bit of a parachute (especially with smaller exhaust like the Akrapovic that I use). I have thought about the weight penalty and debated whether I should keep it (unfortunately I didn't weigh it prior to install). That being said, it's a beautiful piece, likely improves the rear aero, and I have already removed a disproportionate amount of weight from the rear.

I am on the Karbonious intake group buy (saves 7 lbs up front) and could see myself getting a carbon hood in the future (approximately 10 lb weight savings). In addition, I may experiment with lightening of the carpet's foam backing. Plus I have plans to delete the folding door pockets. I sacrificed an extra door card to weigh the pocket and mechanism. It totals 2.5 lbs each side. I would need to fill the space with something (probably alcantara covered AL or Balsa Wood panel) which would add back 0.5 lb +/-. So another 4 lbs there. Lastly I have some lighter seats incoming from Japan. It's TBD whether they will fit properly. If so, I may be able to save another 30 lbs there (Cobra's are heavy). All of the above would get me below 3k lbs with full interior, 1/2 cage, all electronics / stereo, AC, etc. The only comfort sacrifices made are the extra sound present with reduced sound deadening and lack of wipers / washers. I don't see a problem with the wiper / washer delete in my climate. I literally used the wipers 3x with 2 of those instances being accidental bumping of the lever. My washer tank was nearly full and I have had the car for 3 years without ever filling.

can you start a build thread already so we can start really digging in?

also, hows your mirror project coming along? i found these while looking at brake stuff and thought of you... not e36 mirrors, but they are in the spirit of adding lightness...
https://www.pegasusautoracing.com/pr...asp?RecID=1554

[slicer]

Originally Posted by roastbeef

can you start a build thread already so we can start really digging in?

also, hows your mirror project coming along? i found these while looking at brake stuff and thought of you... not e36 mirrors, but they are in the spirit of adding lightness...
https://www.pegasusautoracing.com/pr...asp?RecID=1554

Haha - I need to get on that.

I aborted the mirror project. It would only save 2 lbs and would require a custom mount. Too much of a PIA

[slicer]

Originally Posted by Redd

Slicer, IND has Challenge CF door cards that remove the folding pocket but retain all other hardware.

Yes I saw that. Not sure I want to drop the cash on them. Somehow they seem frivolous despite all the other $$ spent on the car. I like the idea of making a GTS style door card. That's where I got the idea for the pocket delete.

[IMG]https://pictures.topspeed.com/IMG/jp...w-m3-gts-2.jpg[/IMG]

[roastbeef]

Originally Posted by slicer

Haha - I need to get on that.

I aborted the mirror project. It would only save 2 lbs and would require a custom mount. Too much of a PIA

did those regular e92 bases fit?