Max RPM of the M271?
#1
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Max RPM of the M271?
So I was going around 90mph tonight (closed conditions of course) and I decide to floor it. I was past the redline and quickly approaching 6200RPM, so I let go of the throttle...
My question is, why didn't it shift? What is the maximum RPM the M271 can go up to safely? Also, could it be since I put in a K&N Filter yesterday, the ECU hasn't really "adjusted" yet? (I say "adjusted" b/c I know the filter doesn't do much.)
Thanks!
My question is, why didn't it shift? What is the maximum RPM the M271 can go up to safely? Also, could it be since I put in a K&N Filter yesterday, the ECU hasn't really "adjusted" yet? (I say "adjusted" b/c I know the filter doesn't do much.)
Thanks!
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2003 C230K Sport Coupe, 1986 190E 2.3
Redline is actually either 6200 or 6250 on the M271 engine. My rev limiter kicks in at 6250 RPM. On my Coupe they have redline marked at 6000RPM but in the engine specs it is 6200RPM.
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2005 C230 Sedan 6spd
I redline the RPM and hit 6200RPM in 5th gear going 120MPH couple days ago, I was going WOT and I felt the fuel cut off around 6300RPM before I shift quickly into 6th gear. (I wasn't racing, just driving fast to pass couple cars)
So I would say the Maximum RPM is probably 6200RPM if you are pushing it. BTW, I love to downshift while entering into a ramp from 6th gear -> 5th-> 4th->3rd watching the RPM jump to 6000RPM then it engine brakes to 4000RPM and jumps back up to 6000RPM again this engine sounds great in the high RPM zone~
So I would say the Maximum RPM is probably 6200RPM if you are pushing it. BTW, I love to downshift while entering into a ramp from 6th gear -> 5th-> 4th->3rd watching the RPM jump to 6000RPM then it engine brakes to 4000RPM and jumps back up to 6000RPM again this engine sounds great in the high RPM zone~
#7
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Originally Posted by BabyBenz6spd
I redline the RPM and hit 6200RPM in 5th gear going 120MPH couple days ago, I was going WOT and I felt the fuel cut off around 6300RPM before I shift quickly into 6th gear. (I wasn't racing, just driving fast to pass couple cars)
So I would say the Maximum RPM is probably 6200RPM if you are pushing it. BTW, I love to downshift while entering into a ramp from 6th gear -> 5th-> 4th->3rd watching the RPM jump to 6000RPM then it engine brakes to 4000RPM and jumps back up to 6000RPM again this engine sounds great in the high RPM zone~
So I would say the Maximum RPM is probably 6200RPM if you are pushing it. BTW, I love to downshift while entering into a ramp from 6th gear -> 5th-> 4th->3rd watching the RPM jump to 6000RPM then it engine brakes to 4000RPM and jumps back up to 6000RPM again this engine sounds great in the high RPM zone~
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'05 C230SS 6MT, 1966 Triumph TR4a IRS, Shelby Cobra 427 Supercharged
Originally Posted by mrkbbd
are you sure you were in 5th at 120mph, that seems too slow for that speed because I think you hit 110 in 3rd?
1st --> 30mph
2nd --> 50mph
3rd --> 77mph
4th --> 105mph
5th --> 132 mph
6th --> 157mph
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2005 C230 Sedan 6spd
Originally Posted by mrkbbd
are you sure you were in 5th at 120mph, that seems too slow for that speed because I think you hit 110 in 3rd?
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2005 C230 Sedan 6spd
Originally Posted by Kenzmbz
120mph to pass up some cars. Did you share the freeway with and Enzo and Porsche CGT? hahah
If I see a Enzo or a Porsche CGT I wouldn't even attempt to pass them, I keep up with them from behind and enjoy the view 120MPH is like crusing speed for either of those cars and my C230 is Revving its *** off getting to 130MPH then the governer kicks in to ruin everything~
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Originally Posted by BabyBenz6spd
If I see a Enzo or a Porsche CGT I wouldn't even attempt to pass them, I keep up with them from behind and enjoy the view 120MPH is like crusing speed for either of those cars and my C230 is Revving its *** off getting to 130MPH then the governer kicks in to ruin everything~
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excites your girlfriend
Originally Posted by Capt Nemo o2
Redline (6200) with stock tires and a 6 MT
1st --> 30mph
2nd --> 50mph
3rd --> 77mph
4th --> 105mph
5th --> 132 mph
6th --> 157mph
1st --> 30mph
2nd --> 50mph
3rd --> 77mph
4th --> 105mph
5th --> 132 mph
6th --> 157mph
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Mine 2005 C230 Kompressor, Dad's 2005 ML350
I put my car in dyno mode and it behaved really strangly I cant even explain it was slow to start and the revs were really strange and the touch shift or watever you guys want to call it didnt work either anyone ever have this?
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is SOLD
i try to shift a little before or at 6k to try to get the most out of the powerband. anything over over obviously results in fuel cut off at redline, but remember the power band only goes up so high and then power starts to go down again.
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2005 C230 Sedan 6spd
Originally Posted by white_w203
i try to shift a little before or at 6k to try to get the most out of the powerband. anything over over obviously results in fuel cut off at redline, but remember the power band only goes up so high and then power starts to go down again.
189HP@5800RPM <-- This would be a good shifting point
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'05 C230SS 6MT, 1966 Triumph TR4a IRS, Shelby Cobra 427 Supercharged
Originally Posted by BabyBenz6spd
189HP@5800RPM <-- This would be a good shifting point
Last edited by Capt Nemo o2; 01-23-2006 at 10:00 PM.
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2005 C230 Sedan 6spd
Originally Posted by Capt Nemo o2
That actually works out pretty good with the 6 speed up through 3rd gear because that puts you right around peak torque RPM range in the next gear.
Can you please explain what the chart mean? I know its gear ratio, but can you please explain what numbers to look for? in order to find the best shifting point :p I've never seen this kind of chart before. thanks~
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'05 C230SS 6MT, 1966 Triumph TR4a IRS, Shelby Cobra 427 Supercharged
Originally Posted by BabyBenz6spd
Can you please explain what the chart mean? I know its gear ratio, but can you please explain what numbers to look for? in order to find the best shifting point :p I've never seen this kind of chart before. thanks~
According to MB, the M271 hits peak TQ between 3500 and 4000 RPM. So your car to be in/near (right before is best as that would give you more time with peak TQ) that range when you shift into the next gear. Taking that into account, you look at a the speeds you would be doing in the next gear. You want to be doing that speed when you engage that gear.
IE: 1st to 2nd shift --> If you shift at 5800 RPM from 1st to 2nd you would be doing about 27.4 MPH when the shift is started. Give some room for momentum figrure you will end up at 28 MPH in 2nd which puts you at ~3400 RPM, right before peak TQ.
This would be more efficient if you use your own dyno sheets to see what RPMs your peak in TQ and HP. (This chart is for a M271 6speed w/ stock diameter rear tires)
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'05 C230K '10 GLK350 '13 SMART
Redline (6200) with stock tires and a 6 MT
1st --> 30mph
2nd --> 50mph
3rd --> 77mph
4th --> 105mph
5th --> 132 mph
6th --> 157mph
1st --> 30mph
2nd --> 50mph
3rd --> 77mph
4th --> 105mph
5th --> 132 mph
6th --> 157mph