HighQ wroteGood point. PS2s are rather lightweight (24/25 lbs) though compared to the competition. In OEM sizes, the lightest tire I could find on tirerack are the PSCs (21/24 lbs), which is what I currently have on my summer wheels. About $100 more than the PS2s for all corners, but they will wear out faster of course. I put them on for track use in October. They worked out really well. I added the tirerack weight figures to the original post with the data.Tires: depending on make and model they can vary by as much as 3 lbs.
302.4KVIEWS
311REPLIES
21APPRECIATES
03-11-2023LAST POST
rldzhao wroteThat is a good point. If you'd like to provide the extra power/cost ratios for different mods I can add them here. Adding power will most likely be cheaper than reducing weight, but it won't make you go faster around the corners or improve feel, which is why I focused on weight.Hey Lucid,
What do you think about a (delta power-to-weight ratio)/(cost) parameter? This way, we can compare whether it is more cost effective to add power or to simply reduce weight.
RandyB wroteBBK alone will get you 40 pounds lower! Exhaust, boot lid etc... depending on what you get may decrease another 18lbs (5 CF boot lid and say 13 exhaust).Great info in this thread. I knew when I bought this car that I would not be willing to go to great lengths to reduce the weight, so with that in mind I began my weight savings crusade with the option boxes.
E92 instead of E90 - 20 lbs (wasn't considering E93)
CF roof instead of steel MR - 55lbs (11 lb roof + 44 lb MR)
6MT instead of M-DCT - ~44 lbs (?) don't remember the exact figure
Forged 19s instead of 18s - very minimal but rotational
No nav/idrive or packaged options - unknown
I did skip cloth seats for leather, and added EDC even though it added some weight. It also helped that I wanted the above items too, but would have been willing to add some weight if I didn't.
It would be nice to shave an additional 50-100 lbs and try to get closer the the E46 M3 weight. The right combo of wheels, brakes, exhaust and a light weight battery might get half of that but beyond those mods I doubt there is much else I would be willing to sacrifice.
BMW-M-Mexico wroteBBK is 40 lbs. lighter Mexico???BBK alone will get you 40 pounds lower! Exhaust, boot lid etc... depending on what you get may decrease another 18lbs (5 CF boot lid and say 13 exhaust).
Adonislike wroteThat is correct, 18.??? something kilograms (39.6 lbs). This has been weighed a couple of times. Referring to the Brembo BBK here, don´t know about other brands but presume they are similar.BBK is 40 lbs. lighter Mexico???
BMW-M-Mexico wroteYea, if I remember correct you save 18-19lbs a side for a total of 40 or so.That is correct, 18.??? something kilograms (39.6 lbs). This has been weighed a couple of times. Referring to the Brembo BBK here, don´t know about other brands but presume they are similar.
lucid wroteAnd farthest away from hub centerline, where most of the difference applies.Good point. PS2s are rather lightweight (24/25 lbs) though compared to the competition. In OEM sizes, the lightest tire I could find on tirerack are the PSCs (21/24 lbs), which is what I currently have on my summer wheels. About $100 more than the PS2s for all corners, but they will wear out faster of course. I put them on for track use in October. They worked out really well. I added the tirerack weight figures to the original post with the data.
tom @ eas wrotePCS? are which tire, Pirelli Cup Sport??And farthest away from hub centerline, where most of the difference applies.
BMW-M-Mexico wroteRule applies for any tire, no experience with Pirelli Cup Sport personally.PCS? are which tire, Pirelli Cup Sport??
BMW-M-Mexico wroteMichelin Pilot Sport CupPCS? are which tire, Pirelli Cup Sport??
Best regards, south
southlight wroteGot it, thanks!Michelin Pilot Sport Cup
Best regards, south
BMW-M-Mexico wroteHolly Sh*$!!!That is correct, 18.??? something kilograms (39.6 lbs). This has been weighed a couple of times. Referring to the Brembo BBK here, don´t know about other brands but presume they are similar.
Was not expecting that. Guess I'll add this to the ever growing list
BMW-M-Mexico wroteWhat? If you look at the original post using OC Kid's numbers, the weight savings is reportedly 24.6 pounds. BUT, these numbers are incorrect as he used a bathroom scale (no disrespect OC Kid).BBK alone will get you 40 pounds lower! Exhaust, boot lid etc... depending on what you get may decrease another 18lbs (5 CF boot lid and say 13 exhaust).
I re-weighed the OEM brakes. I then posted the numbers according to what OC Kid had weighed for the Brembos. I'm not sure we have accurate numbers for that either. But, for the numbers we have now, BBK will save you about 3.5 pounds TOTAL for Brembo and if you use Stoptech you will save about 2.3 pounds TOTAL. The numbers I have on the Stoptech are accurate down to the hundredths of a pound. See this post here.
badfish wroteYeah, that's what I remember. It's not 40lbs. Now on some cars, the savings could be that much I am sure given that you replace a cast-iron rotor hub with aluminum.What? If you look at the original post using OC Kid's numbers, the weight savings is reportedly 24.6 pounds. BUT, these numbers are incorrect as he used a bathroom scale (no disrespect OC Kid).
I re-weighed the OEM brakes. I then posted the numbers according to what OC Kid had weighed for the Brembos. I'm not sure we have accurate numbers for that either. But, for the numbers we have now, BBK will save you about 3.5 pounds TOTAL for Brembo and if you use Stoptech you will save about 2.3 pounds TOTAL. The numbers I have on the Stoptech are accurate down to the hundredths of a pound. See this post here.
BTW, I weighed my 09 E90 Sedan on corner balance scales at the track this weekend. Driverless, with a full tank and a 25lb baby seat it was 3722lbs. Cross weight was 53.3% and with me in the car that dropped 0.3%. I have all options except extended leather and a sunroof. That is more than I was hoping for, but it did well enough on the track with stock pads and tires that I am not too worried. It is easily faster and more rewarding to drive than a stock E46 around a 3 mile course.
badfish wroteThanks for reminding me this Badfish. I fixed the original post with your numbers for the stock and Stoptech weights. For the Stoptechs, I get 8.6 lbs savings for all 4 corners. I erased OC Kid's Brembo numbers since his scale seems to have been off. Now, I need accurate weight figures for the Brembos and cost figures/reference/link for your Stoptechs.What? If you look at the original post using OC Kid's numbers, the weight savings is reportedly 24.6 pounds. BUT, these numbers are incorrect as he used a bathroom scale (no disrespect OC Kid).
I re-weighed the OEM brakes. I then posted the numbers according to what OC Kid had weighed for the Brembos. I'm not sure we have accurate numbers for that either. But, for the numbers we have now, BBK will save you about 3.5 pounds TOTAL for Brembo and if you use Stoptech you will save about 2.3 pounds TOTAL. The numbers I have on the Stoptech are accurate down to the hundredths of a pound. See this post here.
lucid wroteDuh, my bad math. I took a chart that PencilGeek made and modified it but neglected to notice that it was not for all 4 corners. So my total for the OEM brakes is 135.8 and the Stoptech kit 131.19.Thanks for reminding me this Badfish. I fixed the original post with your numbers for the stock and Stoptech weights. For the Stoptechs, I get 8.6 lbs savings for all 4 corners. I erased OC Kid's Brembo numbers since his scale seems to have been off. Now, I need accurate weight figures for the Brembos and cost figures/reference/link for your Stoptechs.
For reference, here is a link to Modbargains for the E92 M3 BBK. Price depends a lot on the options.
Thanks for keeping this list up to date.
badfish wroteYou are right. I copied the wrong number. The total weight reduction for your Stoptechs is 4.6 lbs. Honestly, if it was significantly more, I'd have to wonder where the reduction is coming from. I don't see how one can make the rotor significantly lighter and keep the same thermal mass to keep temps in check.Duh, my bad math. I took a chart that PencilGeek made and modified it but neglected to notice that it was not for all 4 corners. So my total for the OEM brakes is 135.8 and the Stoptech kit 131.19.
badfish wroteIt priced out to $6050 with drilled rotors. Thanks.For reference, here is a link to Modbargains for the E92 M3 BBK. Price depends a lot on the options.
lucid wroteI found an e-mail that had the exact pricing information. I have one other option on my rotors and that is the zinc coating which is $70 for front and $70 for rear. So here is a typical breakdown on retail pricing...It priced out to $6050 with drilled rotors. Thanks.
Front base $3295 + $100 Drilled + $70 Zinc = $3465
Rear base $2595 + $100 Drilled + $70 Zinc = $2765
Hey Lucid, for Ericsson's CF exterior doors, it should be 33lb for EACH door. Thanks.
I would say sunroof delete, titanium exhaust, lightweight battery, lighter 18 inch wheels + tires. This would give you a decent weight loss if you do not want to rip your car apart...
rldzhao wroteYes, there is something off there. I am not sure how to interpret bulletproof's claim: "The set of doors weigh 7.37lbs compared to 41 lbs for the stock doors". Those figures are referring to both doors (set), but then the parts catalog seems to be quoting a single stock door panel at 18 kg. Do you have additional info to clarify this?Hey Lucid, for Ericsson's CF exterior doors, it should be 33lb for EACH door. Thanks.
jml wroteThanks for the info for the e90....Yeah, that's what I remember. It's not 40lbs. Now on some cars, the savings could be that much I am sure given that you replace a cast-iron rotor hub with aluminum.
BTW, I weighed my 09 E90 Sedan on corner balance scales at the track this weekend. Driverless, with a full tank and a 25lb baby seat it was 3722lbs. Cross weight was 53.3% and with me in the car that dropped 0.3%. I have all options except extended leather and a sunroof. That is more than I was hoping for, but it did well enough on the track with stock pads and tires that I am not too worried. It is easily faster and more rewarding to drive than a stock E46 around a 3 mile course.
