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Crank Pulley (no tune)

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7K views 22 replies 10 participants last post by  zeWaardt  
M
#1 ·
Just wanted to make a post to anyone contemplating upgrading their crank pulley (from Speer). My car is stock - as far as I’m aware - other than my new crank pulley upgrade. Here are some acceleration figures:

stock:
Screenshot Font Rectangle Software Multimedia


With crank pulley upgrade:
Font Screenshot Rectangle Multimedia Software

(Would like to add my boot was full with all of my tools + spare wheel, and I reckon it can do faster as it didn’t hook properly and I had a soft bend to deal with at about 30mph!)

But as you can see, quite a difference ay!?
Next a tune…!!!
 
P
#3 ·
Good to see someone else tried it , the results are great . I did the pulley , got sacha at speers in Germany , Heilbronn if I recall , to download the improved map . I was travelling from south of France to the Nurburgring so I made a detour to Heilbronn for the map .
I also fitted a half as big again intercooler which in my opinion is a waste of money as the std one is an excellent design with the factory ducting . I also felt like I got a worthwhile gain from a bigger cone type filter and some cold air ducting .
I know for a fact that my old car is still running around since I did the mods , probably over 30000 miles ago so it’s definitely a reliable mod .
Good luck and it’s nice to see someone actually get a few figures ,
 
#5 ·
Tru Lie said:
Can you provide the product # or link for the crank pulley?
Click to expand...

Not sure which member you are asking, but a mention (just put '@' in front of username without spaces) can direct your question.

I'll mention the two most likely, but note that both are UK based.

@MattHam @Paulwirral

Try Pelican Parts. They also have some useful sheets for doing jobs for those in the US.

Mercedes Parts and Accessories - OEM Mercedes-Benz Parts - Performance Mercedes Parts at PelicanParts.com

We've got the world's largest selection of Mercedes Parts and accessories. We have Mercedes Parts for C-Class, E-Class, E320, AMG, S-Class, SLS, and more.
www.pelicanparts.com

Looking up part numbers for stock
www.slkworld.com

LINKS to Parts, Assemblies, Technical Data, Locations of...

I could not face the traffic this Holiday Weekend - So what to do ?? I've just put together a Small Web Site (2 Pages)with links on them to SLK R170,R171 & R172 Parts, Assemblies, Technical Data and the Locations of Parts. Also there is a Large listing of ODBII Fault Codes (Circa 3000) and a...
www.slkworld.com www.slkworld.com
 
M
#7 ·
Yes this could have an impact for sure. It’s something I’d not considered before! Both tests were done late at night but mid summer would tend to be warmer at night still for sure
 
#9 ·
I’m planning on tossing a pulley on my SLK as well and finding a tuner that can dial it in, but I’m pretty interested..

Anyone did numbers on pre-tune vs post-tune with a pulley? I‘m definitely getting a tune and an AFR gauge just for safety, but I’m really interested in how much the gains are with a tune after fitting the pulley.

Unfortunately no fuel pressure regulator fiddling on my facelift car, otherwise I’d have done that with an AFR gauge on hand!
 
M
#20 · (Edited)
I was able to gain around 9 bhp within the 5k-6k range with Sacha's tune. Here is the dyno with and without the tune on my 200K facelift (163hp stock) with smaller pulley on the M45. What tune did actually was the fixing the flat spot between 5k-6k. After the tune engine likes to rev upto the redline as in stock.

Rectangle Slope Font Line Parallel
 
#11 ·
Unfortunately I haven't dyno'd a car with a crank pulley, from what they say it's supposed to pick up around 20bhp with the supporting mods on a pre facelift.

The issue with these cars is more consistency as no supercharger will get the same output, I've had chargers (M62) that look unhealthy but make more boost than chargers that are tidy and have a good Teflon coating.

On the facelift I don't think the gains are as big more given to the fact the M45 supercharger is pretty much at its limits of efficiency stock, I never really understood why Mercedes went with that supercharger on this capacity engine other than it was just more cost effective. But that said they do the job and there is gains to be had but unfortunately even on a pre facelift car without a remap it's not a huge difference.
I actually found that just remapping my CLK made it feel more powerful than using an overdrive pulley by quite a bit that coupled with the subtle intake mods made quite a difference.

When you really want to go mad, you can just stick a turbo on there and send the cylinder head to the moon. These cars turbo'd are so much fun but frustratingly it's hard to make them reliable yet they have so much potential.
 
#12 ·
Going completely mad with a turbo setup might be something for the future, I'm already in the middle of stuffing some forced induction on another project car :LOL:

I'll get the overdrive pulley, see how much I can still get out of that M45 and see if I can find someone that can remap my car. Any extra horses are welcome!
It's a shame they did away with the M62.

What kind of intake mods can be made on this car? I've installed a straight-through intake from bits I had lying around (pod-style filter down near the grill with some tubing) mostly to bring out some more of that supercharger whine.
 
#13 ·
zeWaardt said:
Going completely mad with a turbo setup might be something for the future, I'm already in the middle of stuffing some forced induction on another project car :LOL:

I'll get the overdrive pulley, see how much I can still get out of that M45 and see if I can find someone that can remap my car. Any extra horses are welcome!
It's a shame they did away with the M62.

What kind of intake mods can be made on this car? I've installed a straight-through intake from bits I had lying around (pod-style filter down near the grill with some tubing) mostly to bring out some more of that supercharger whine.
Click to expand...
Awesome buddy, with these cars or well engines the main thing is to keep the intake temps as low as possible. With roots type superchargers once they're pushed to or out of their efficiency range they start to generate a lot of heat, so with the higher the intake temps the more the ECU will pull the timing to reduce "knock" (DET) retarded timing means less power, so cold air mods really do make a difference on these cars.

So and cold air intake needs to be a true shielded cold air intake, by this I mean avoid any engine bay air being drawn in if possible as this increases the intake temps. A larger air to air or even a air to water intercooler would really benefit the engine, I believe a few have played with water meth injection but not sure of the results.
 
#14 ·
I've got an intake tube running down to the grill already, water injection secretly is something I've wanted to try for a long time already.... Might give it a go :D
I can do an Arduino based system like I did the fuel injection on my ol' Skoda.

I've been thinking of isolating the supercharger bypass from the air intake, in my facelift model the bypass and the supercharger's intake are directly linked through that big box. I'm not sure if this is impactful at all, but talking some loose theory..

When driving normally and not getting in boost range the supercharger is bypassing all the time, heating up the intake box. I feel like the effect would be pretty minimal, as the supercharger puts out a lot more heat under boost and the fresh air getting drawn through the intake box probably displaces the hot air inside of it pretty quickly, but I do feel like the car becomes a bit more sluggish after driving in traffic for a long time. Opening her up a few times gets the power right back. Might just be in my mind though!

Comparing how warm the box feels to the touch after just cruising and city driving versus when I've been hooning, the box definitely a lot warmer after just cruising or driving in traffic than after I've been hooning around.

It's a small mod, might just do it to see what the differences are!
 
#15 ·
De-linking the bypass and airbox isn't a bad idea, one thing from experience you may notice the car become a little more laggy on throttle.

Using a Arduino also sounds like a great idea, have it set up so only on WOT the water meth is applied, the only issue may be the MAF sensor becoming contaminated unless applied at the throttle body. I'm far from an expert on water meth though as I've always been of the opinion if you have to use that your pushing the set up too far and out of any efficiency.
 
#16 ·
Yeah it is a fun thing to play with.

Some theory I got from the drag guys over in the US is that spraying meth/water before the supercharger, is cooling the supercharger down.

As it hits the lobes, it evaporates and takes the heat energy from it. It sounds like a fun idea to try! I might rig something up sometime…


But first I want to get some headlights!
 
#17 ·
Yeah that's exactly right that's why you see a lot of drag cars on methanol, it's especially noticeable on blower cars as the blower has condensation build up on it from being so cool. It's actually quite impressive to see.

It's worth trying especially as the M62 and M45 superchargers turn into heat pumps, like I say cooler the intake temps the more advanced the timing, as these engines are so prone to DET water meth will only help it.
 
J
#18 ·
I would really like to see 0 to 60 mph in 5.4 sec with only a crank pulley on a M45 230. A rather big improvement from standard 6.9 to 7.0 seconds !!! How was this timed. i have been drag racing for the last 40 years so would be interested? If using phone app that would explain the time.
 
M
#19 ·
Unfortunately it’s not perfectly timed like you’d get down the drag strip! I too would be very interested to see it down the drag strip.
I use an OBDII port reader and it has an acceleration function which combines engine sensor data + GPS to calculate everything. So I wouldn’t be so confident it’s 100% accurate, but still showing improvement from the original time nonetheless.
 
#21 ·
I'm bumping up this thread, I've ordered a crankshaft pulley. Time to start playing!

I'm still sitting with the problem of being unable to find a tuner that wants to work on my car, so I will have to find a solution myself to increase fueling.
 
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#22 ·
Installed the crankshaft pulley and wow the power difference is amazing!

Have not set up the fueling yet, but even without a tune the car actually runs great. I don’t have any of the flatting out at high RPM I’ve heard others report. In fact, the car only seems to gain more and more power with RPM until the rev limiter comes to prevent the party from going destructive. Considering the car already has a bunch of aftermarket stuff, I’ve always wondered if someone tickled the ECU before already but I don’t know how I’d confirm that.

So much supercharger whine as well, I’m in love!

I hope I can get the ECU situation figured out soon so I can fix the air/fuel ratio at the high rpm and hopefully tighten the timing a little bit for an E98 tune.

The car is heaps faster!
 
#23 ·
Heh

Car goes sideways pretty easily now, don’t tell the cops :)

Has anyone actually done any AFR readings on a pulleyd car with no tune?

While I’m working on getting a tune, the car is running fantastically at the moment without even the slightest hint of hesitation and pulls clean all the way till redline. This doesn’t say anything about AFR obviously, as a lean engine often tends to run well anyway but gets dangerously high combustion chamber temperatures.
 
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