Roll Race: Stock RC-F vs Stock BMW M4
06-19-17, 12:04 AM
#16
no way, if the RC-F weighed 3,600lbs it would shatter the M4, it comes down to transmissions ratios and power to weight ratio at that point.
Also in this video what we lack is knowing the ratios at that speed, it's entirely possible the M4 was in a high gear that would allow him to build boost while being in a more optimal rpm than the RC F. That M4 jolted and then slowed down. So that M4 could have been at say 40mph in 2nd gear building boost while the RC F was in 2nd/3rd but lower RPM's because the ratios between these two trans are not the same. So even if power to weight ratios were the same, we don't know where these cars sat @40mph or whatever speed they rolled off. The M4 with brake boost will definitely snap on a roll.
in the video it appears and sounds as if the RC F shifts after the M4 does suggesting the M4 had been in a more optimal gear. Also, one must question altitude, as an RC F will get pounded in Colorado by an M4 all day. I suppose there could also be the question of how much these passengers weighed and fuel tank fills. You can easily be talking about a 250-300lbs difference between fuel and passengers.
Also in this video what we lack is knowing the ratios at that speed, it's entirely possible the M4 was in a high gear that would allow him to build boost while being in a more optimal rpm than the RC F. That M4 jolted and then slowed down. So that M4 could have been at say 40mph in 2nd gear building boost while the RC F was in 2nd/3rd but lower RPM's because the ratios between these two trans are not the same. So even if power to weight ratios were the same, we don't know where these cars sat @40mph or whatever speed they rolled off. The M4 with brake boost will definitely snap on a roll.
in the video it appears and sounds as if the RC F shifts after the M4 does suggesting the M4 had been in a more optimal gear. Also, one must question altitude, as an RC F will get pounded in Colorado by an M4 all day. I suppose there could also be the question of how much these passengers weighed and fuel tank fills. You can easily be talking about a 250-300lbs difference between fuel and passengers.
Last edited by danielTRLK; 06-19-17 at 12:11 AM.
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finny76 (06-23-17)
06-19-17, 04:07 AM
#17
When i bought the RCF, I am well aware the M4 is a tad faster. But dollar for dollar, for what i paid, my RCF is much faster. Given if the RCF, M4, CTS V, C63 are selling at the same price after discount, it would been the CTS V hands down for performance and overall package. BTW, reliability doesnt really matter until warranty expires after 5 years. Which most already changed cars by then
What he said. Considering that I leased my RCF in December of 2015 when there was a glut of inventory and got a monthly payment of $400 less than an M4, I am thoroughly happy with the Lexus. But dollar for dollar I probably would have gotten an C63.
06-19-17, 07:06 AM
#18
Lexus Champion
every 100 pounds decrease in weight equates .1 sec decrease on the 1/4 mile. The RCF is roughly 400 pounds more than the M4, you do the math.
My best 1/4 mile time on the RCF (with borla) is 12.4 If I can shed 400 pounds, I could get it in the high high 11s. The M4 runs low 12s stock
My best 1/4 mile time on the RCF (with borla) is 12.4 If I can shed 400 pounds, I could get it in the high high 11s. The M4 runs low 12s stock
06-19-17, 09:26 AM
#19
The BMW is clearly the faster car...period. I do question the RCFs driving skills. I do question if the RCF driver was in his powerband, which is above 5k rpm. The engine sounds pretty quiet to be in sport/sport + and hovering around 5500 rpm, which is exactly where I would've been for this race. Sounds like he was too high a gear
06-19-17, 09:44 AM
#20
Lexus Champion
Thread Starter
Not sure where this video was taken but that seems like a faster than normal pulling M4. Hard to tell I suppose. The M4 also will pound the RC F in higher elevations. Also in roll racing boost has a huge effect vs N/A cars. I forgot what magazine did a 1/4 but the M4 barely inched away, and it's a better set up platform.
I'm interested how the RC F would perform with the RR Racing Rotor swap and the lithium battery, that is 30lbs off of rotational mass, and overall 67lbs dropped, with RR's coil over's that would be a total of 107lbs shed. The M4 comes with track ready suspension, where as the RC F is like a GT Touring car. I wonder if the RC F had come from factory with better suspension if all the car magazines would have ripped on it as hard, it likely could have kept up with the M4 around the track, I've driven the M4 stock and it feels like my modded RC F. And then there is something to be said about heat soak, with 10quarts in the sump and N/A, I bet these two cars head to head for a few hours versus a minute would have a different outcome.
I bought CPO with just under 1,000 miles. I got a 9 year unlimited warranty zero deductible and road side, tires, etc. At 50,000 miles a year, someone is going to eat this trans and diff rebuild and it won't be me lol Maybe Toyota will pay to have my "lifetime fluids" changed or they're looking at a guranteed repair bill.
Buying a new RC F, the max warranty I believe is 9 years/125,000 miles
I'm interested how the RC F would perform with the RR Racing Rotor swap and the lithium battery, that is 30lbs off of rotational mass, and overall 67lbs dropped, with RR's coil over's that would be a total of 107lbs shed. The M4 comes with track ready suspension, where as the RC F is like a GT Touring car. I wonder if the RC F had come from factory with better suspension if all the car magazines would have ripped on it as hard, it likely could have kept up with the M4 around the track, I've driven the M4 stock and it feels like my modded RC F. And then there is something to be said about heat soak, with 10quarts in the sump and N/A, I bet these two cars head to head for a few hours versus a minute would have a different outcome.
I bought CPO with just under 1,000 miles. I got a 9 year unlimited warranty zero deductible and road side, tires, etc. At 50,000 miles a year, someone is going to eat this trans and diff rebuild and it won't be me lol Maybe Toyota will pay to have my "lifetime fluids" changed or they're looking at a guranteed repair bill.
Buying a new RC F, the max warranty I believe is 9 years/125,000 miles
06-19-17, 12:19 PM
#22
06-19-17, 01:18 PM
#23
M4s power is underrated. Us SoCal guys with FBO and tune dynoed at a European shop. We were putting down 410-425whp with all NA mods. I was asking the owner what stock m4s were putting down and he showed me. They were all around ~425-430whp. That's already still more than us at FBO tuned
06-19-17, 01:29 PM
#24
every 100 pounds decrease in weight equates .1 sec decrease on the 1/4 mile. The RCF is roughly 400 pounds more than the M4, you do the math. My best 1/4 mile time on the RCF (with borla) is 12.4 If I can shed 400 pounds, I could get it in the high high 11s. The M4 runs low 12s stock
06-19-17, 02:13 PM
#26
It is well known that the BMW advertised H.P and TQ figures are not true and are in fact higher ...so yes...the M4 has more that 425 h.p., It is what it is. The F
will get smoked every time by the M4. But there is an alleged SUPRA coming....hmmmm........ ;-)
airlaird..
will get smoked every time by the M4. But there is an alleged SUPRA coming....hmmmm........ ;-)
airlaird..
06-19-17, 02:36 PM
#27
Lexus Champion
That 0.1/100 lbs is theoretical. Plus u have mods choosing a best run, not a similar comparison. A stock rcf runs high 12s and a stock m4 runs low 12s. even if rcf was as light as it might be a mid 12 car since it has less power, but still not comparable in speed performance in a straight line of an m4
you are telling me I can't shave 1/2 second by dropping 400 pounds?
06-19-17, 02:39 PM
#28
Lexus Champion
06-19-17, 02:52 PM
#29
So therefore, we can talk theoretical all day long...but the video is showing real facts and real time. The M4 is faster than the RC F....we have to accept the fact that
the RC F is heavy and weighs it down in a race with an M4..and the ATS-V...the C63...and.....maybe even the GT 350. ALL in the same price range.
airlaird