200K (M271) next performance mod after SC pulley - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 10-26-2017
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200K (M271) next performance mod after SC pulley

I think there is a common agreement that updating the standard pulley of a 200K (m271) engine leads to a significant HP increase.

Prefacelift models include a 72mm pulley for the SC.
Facelift models include a 65mm pulley for the SC.
In both cases, the crank pulley has 175mm.

The smaller pulley (for instance IBF model) has 62mm. I believe this is the smallest pulley available for this engine.

1. Crank 175mm / supercharger 72mm = 2,43 gearing X 6.200rpm = 15.100 (All the 163hp with the 2080, 2180, 2380 etc.
2. Crank 175mm / supercharger 65mm = 2,69 gearing X 6.200rpm = 16.700 with the 184hp and 192hp with the 2780
3. Crank 175mm / supercharger custom 62mm = 2,82 gearing X 6.200rpm = 17.500

My first question here is, updating the stock fuel regulator (3.8bar) to a bosch 5.bar, would also lead to a HP increase?
The installation manual of Kleeman Bost kit for M271 indicates the update of the fuel filter by either a kleemann or bosch model (see attached).

My second question is connected to updating also the crank pulley. The kleemann pulley has 195mm.

5. Crank 195mm / supercharger 62mm = 3,14 gearing X 6.200rpm = 19.500
6. Crank 195mm / supercharger 65mm = 3 gearing X 7.000rpm = 21.000
7. Crank 195mm / supercharger 62mm = 3,14 gearing X 7.000rpm = 22.000

I dont know the size of the SPEER Crank Pulley.

The experience of the user gogos is that the maximum rpms of the SC without breaking are: 19.500rpm
Thank gogos for your interesting information: https://mbworld.org/forums/performan...5-porting.html

Does anyone here has installed the Crank 195mm / supercharger 62mm combination?
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File Type: pdf KLEEMANN_M271_Performance_Kit_V2.pdf (904.9 KB, 41 views)
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#2 Old 10-28-2017
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Update:

4. Crank 195mm/supercharger 65mm = 3 gearing X 6.200rpm = 18.600
It is the kleemann combination, so we can assume, after all these years, it is completely safe for our engines.

The speer crank pulley kit is NOT compatible with our cars. I got reply from them.
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#3 Old 11-11-2017
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I contacted Kleemann about combining the two pulleys (Kleemann + IB:
5. Crank 195mm / supercharger 62mm = 3,14 gearing X 6.200rpm = 19.500

This was his reply:
"it might work or it might not, I cant say as I never tried it."
"its up to you, I can advise you on anything else than our products, that must be quite understandable."
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#4 Old 11-11-2017
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Quote:
Originally Posted by 32xforever View Post
I contacted Kleemann about combining the two pulleys (Kleemann + IB:
5. Crank 195mm / supercharger 62mm = 3,14 gearing X 6.200rpm = 19.500

This was his reply:
"it might work or it might not, I cant say as I never tried it."
"its up to you, I can advise you on anything else than our products, that must be quite understandable."
Their reply reminds me of politicians....a lot of words that actually say nothing....except, perhaps, you are on your own!


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#5 Old 11-15-2017
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I have updated the table:

1. Stock 200K (163HP version) = Crank 175mm / supercharger 72mm = 2,43 gearing X 6.200rpm = 15.100 -> 163HP
2. Stock 200K (184HP version) = Crank 175mm / supercharger 65mm = 2,69 gearing X 6.200rpm = 16.700 -> 184HP
3. 200K (163 or 184 version) + IBF Pulley + Remap = Crank 175mm / supercharger custom 62mm = 2,82 gearing X 6.200rpm = 17.500 -> 200HP
4. 200K (163 version) + Kleemann Kit = Crank 195mm/supercharger 72mm = 3 gearing X 6.200rpm = 16.792 -> 192HP
5. 200K (184 version) + Kleemann Kit = Crank 195mm/supercharger 65mm = 3 gearing X 6.200rpm = 18.600 -> 215HP
6. 200K (163 or 184 version) + IBF Pulley + Kleemann Kit + Remap = Crank 195mm / supercharger 62mm = 3,14 gearing X 6.200rpm 19.500 -> 225HP
7. 200K (184 version) + Kleemann Kit + Remap with 7000 rpm limit = Crank 195mm / supercharger 65mm = 3 gearing X 7.000rpm = 21.000 -> 240HP
8. 200K (163 or 184 version) + IBF Pulley + Kleemann Kit + Remap with 7000 rpm limit = Crank 195mm / supercharger 62mm = 3,14 gearing X 7.000rpm = 22.000 -> 252HP

For the red ones you need to seriously mod the SC or it will not support that rpm.
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#6 Old 01-13-2018
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I am wondering if the -10C MOD is a perfect match for SC spinning faster.

Spinning the SC faster causes high temperature. With the -10C MOD the fan will not only turn on sooner, but run a lot harder. In turn, it will lower the temp of the coolant used by the intercooler, helping to mitigate the extra heat of the SC.

-10C MOD, STAR DAS:
Control Units> Drive> Engine> Control Unit Adaptations> Correction Programming> Suction Fan> Temp increase to max of 10 degrees C.
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#7 Old 01-24-2018
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Quote:
Originally Posted by 32xforever View Post
I have updated the table:

1. Stock 200K (163HP version) = Crank 175mm / supercharger 72mm = 2,43 gearing X 6.200rpm = 15.100 -> 163HP
2. Stock 200K (184HP version) = Crank 175mm / supercharger 65mm = 2,69 gearing X 6.200rpm = 16.700 -> 184HP
3. 200K (163 or 184 version) + IBF Pulley + Remap = Crank 175mm / supercharger custom 62mm = 2,82 gearing X 6.200rpm = 17.500 -> 200HP
4. 200K (163 version) + Kleemann Kit = Crank 195mm/supercharger 72mm = 3 gearing X 6.200rpm = 16.792 -> 192HP
5. 200K (184 version) + Kleemann Kit = Crank 195mm/supercharger 65mm = 3 gearing X 6.200rpm = 18.600 -> 215HP
6. 200K (163 or 184 version) + IBF Pulley + Kleemann Kit + Remap = Crank 195mm / supercharger 62mm = 3,14 gearing X 6.200rpm 19.500 -> 225HP
7. 200K (184 version) + Kleemann Kit + Remap with 7000 rpm limit = Crank 195mm / supercharger 65mm = 3 gearing X 7.000rpm = 21.000 -> 240HP
8. 200K (163 or 184 version) + IBF Pulley + Kleemann Kit + Remap with 7000 rpm limit = Crank 195mm / supercharger 62mm = 3,14 gearing X 7.000rpm = 22.000 -> 252HP

For the red ones you need to seriously mod the SC or it will not support that rpm.
Do you think the smaller pulley is the only hardware modification to up the 163 to 184 bhp?
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#8 Old 01-24-2018
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Quote:
Originally Posted by dandywarhol View Post
Do you think the smaller pulley is the only hardware modification to up the 163 to 184 bhp?
I think so. Just check this thread:
The Complete M271 Engine thread

The Complete M271 Engine thread. ( Revised and Updated ) | MBClub UK - Bringing together Mercedes Enthusiasts
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#9 Old 01-24-2018
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Wow, that was a long read and my eyes are watering! Thanks for the info.

Once again there is a lot of BS talked (for exmple, the supercharger is NOT a Rootes type, it is a twin screw, different operation) but there is also a lot of interesting stuff in there too.

I've posed the question in a few threads on here but with no definitive answer, so I'll try here. How do you fool the MAF to stay below 5 volts when the supercharger speed (therefore volume is increased? On the M111 (193 bhp engine) you need to "clamp" the MAF voltage with a zenor diode so it will not exceed 4.9 volts, otherwise the ECU opens the blow off flap from the supercharger and you negate any increase in air volume. I'm assuming you need to do the same on the 271 engine, but nobody appears to know.

I'm also interested in the results that remapping the ECU doesn't appear to do much for horsepower (but in my mind torque is more important, the horsepower will follow) despite the tuner's claims. I remapped my old 230 with Quantum software through a modified 38 pin plug to the OBD2 plug and while I didn't dyno the car, it certainly felt quicker mid range through the seat of my pants.

So, what's the situation to fool the ECU supply voltage if the supercharger runs higher RPMs on the 271 engine because to me, if the MAF voltage isn't clamped then there is no point in blowing more air (not me y'understand, the supercharger! ) ?
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I think that de reported behavior matchs your question:

smaller pulley and no remap = you don't release the full power of the smaller pulley because the ECU opens the blow off flap from the supercharger
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Quote:
Originally Posted by 32xforever View Post
I think that de reported behavior matchs your question:

smaller pulley and no remap = you don't release the full power of the smaller pulley because the ECU opens the blow off flap from the supercharger
Thanks. Does the remap then overcome this problem by "clamping" the voltage? Is this because of more advanced electronics to the earlier 170s and it wasn't possible to fully remap through the old 38 pin?
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#12 Old 01-25-2018
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You can use a Ktag if no obd remap is possible.
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You can use a Ktag if no obd remap is possible.
So, is the Ktag a series plug and play box? Does it limit the MAF signal?
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#14 Old 01-25-2018
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No, Ktag is a tool read/write the memory on car ecu.
Some ecu need to be open in order to read/write the map on them.
After you have the file you can use WinOLS or ECM titanium to tune the map, add/remove functions, remove DTC. Then you flash the modified file back on the ecu.

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