I have the Euro. 65mm SC pulley. Not many mods left that give a decent return for the price. If I added a 178mm crank pulley and pulley saver kit I might get the best return.
Another option would b to raise the shift points to 6500rpm. That would get the rollers spinning at a higher rpm and perhaps give good results keeping the revs up after shifts.
The pulley could be done with the stock injectors and the Kenne-bell boost-a-pump. It works on the Cobra motors running over 1 bar of boost. THX
I still would like to know what supporting mods you guys with the stack are running and the boost you attain.

 

This isnt a cobra....you refer to it like they are the same. Go ahead and try it. Tell us how it works out for you.

 

there are and have been a few that run the stacked pulleys. it works great if your tune is set up for it. AFR'S will tell u if your tune us set up,,,if not you may need a new engine soon,, good luck. jim

 

Thanks for the responses. 8 months ago I didn't know what a SLK32 AMG was. Asking about running more boost is not harmful, only going about it without plenty of research could be. These motors have a static compression ratio of 10:1. None of my forced induction cars had more than 8.5:1. It's a start.

 

Tommy, I was going to leave this alone but am curious as to your knowledge about Cobra's. You probably know more about them than I do and referring to the Cobra in the same sentence as the Mercedes must say something that, again, I don't know. If I have come off as being cocky I apologize for that when referring to the Cobra's. I can tell you all I know little about the Cobra's except they have the potential to be crazy powerful. I prefer my Mercedes over the Mustang without a doubt. FOR A FACT, THEY ARE NOT THE SAME. The SLK is smooth, quiet and easy to drive. The Cobra was rough, noisy and difficult to drive. Given the choice I would take the SLK. I do enjoy modding my vehicles and this is my last, Lord willing. That is why I have put thought into what I have done to the car, especially the motor. I see that a couple of you have been around the block a couple of times. So you likely know what a "nailhead" is. getting one to run with it's sister cars is/was difficult. I had 5 of the Buick GS cars. Then there was the '74 El Camino. The 454 got that 4000+ vehicle moving! jump forward and the quickest was a 122c.i. Eagle Talon TSI AWD.11.68 @ 122mph. The Mustang was just the car that got me to Florida. I did little of the driving, maybe 2 hours a day.
If any mods are done on this current car, Rob, owner of the best aftermarket parts for these cars in my opinion, would be my go to guy for the final opinion. He truly does seem to "have forgotten more about these cars than most people know about them". I have garnered a respect for him in a short amount of time. It's nice to have the opinions of so many and some even have hard facts that back those opinions. Those are the ones to listen to! Again, if any references to other cars other than the ones driven by the 3.2 SC V6 in what we drive, I apologize. Let's enjoy driving these cars and share the experience. Mark

 

been there done it. ran a c3 65mm and a fluidamper 178. wont not run a e/c pulley by it self let alone run one stacked. doing this is running your s/c at the ragged edge. do this at your own risk. new engine is 16k$+

 

32Crazy, we've chatted before and I agree completely. I have the 181mm with a machined OEM sc pulley at 70mm and of course the SL55 pump and adj. regulator but I do not run all out very often and not for very long. Actually, I was thinking of going down to about 175 for the crank pulley.

 

I'll start by saying if I came off rude it was not my intention. As far as Termi's go....I do have some knowledge, but most of what I can spout out you can find on google in a matter of seconds so I will spare that. The point I was trying to make is this....because one thing works for a certain platform, it by no means makes it doable for the next. If it were as simple as monkey see, monkey do...these cars would be tons faster/quicker.

 

Just a word on the boost, stock is 14.2, with my stacked setup, it's about 22 psi. That is about as far as you want to go. Again, I think a change to fresh SC oil should be a part of any pulley upgrade.

 

Thanks. I mentioned the Boost-a-pump sold primarily for the Cobra. It does work for any forced induction car. I know I own an SLK32. I need definitive info on supporting mods for a 65mm SC pulley and a 178 crank pulley w/saver kit. these will never match a Cobra except for AMX1397's car.

 

You're fine. I owned a '99 GT with an '03 Cobra motor, Magnum 6-speed and a 3.73 geared rear. 440/440 to the wheels. Boost-a-pump works on any forced induction motor. My quickest ride had 122c.i. And put 450 to the wheels, 11.68 @122mph with my tune. it would have gone 10.999 with a pro dyno tune. Each car has it's limitations and ridding is all about trying things, not just bolting parts on. Peace bro'

 

I thought we were past this.....

 

I have 64.7 mm s/c pulley and 186 mm crank pulley. Solid aluminum crank pulley.
SL55 Fuel pump. 985 cc/3.8 bar fuel injectors. E85.

On the Video i run 70.65 s/c pulley, 186 mm crank pulley and gasoline.
And a leaking Iintercooler.

https://www.crossfireforum.org/forum...ale-3-3-a.html

 

Unforseen expenses slowed me down. What I need is exactly what I will need beyond the 178 crank pulley and the PSK. What about the Walbro run right before the adjustable regulator/filter? Does the tank have to be dropped to change to the SL55 pump? I think Chuk will help with labor though I have not PM'd him in a while.
The wideband o2 is another question, I have always used PLXdevices, around $190. on ebay, excellent quality. Not sure if o2 datalogging is available with the PLX kit though, have to check that.
So the regulator is the one for sure item. Wideband but which one?
I need to start buying parts and the 178PSK will be first as I can get a fair deal used. Soon for that. Curious as to what AFR you stacked guys run, care to share?

 

You are playing with fire with that combo, turning the supercharger faster than it's safe rpms, I hope you don't go there often. With that SC pulley, I wouldn't go over 178 on the crank but what do I know?

 

So what did you do? Go back to the 65mm SC pulley? Your statement alone did not inform anyone and I would rather learn before I need a new motor as at that point I would simply quit. Sometimes I think an '87 Buick GN/T-Type may have been a better base. maybe mid 12's is all I should acceept and enjoy that for what it is though what you did would be of great benefit to many besides myself I'm sure.

That has been another question I have had. Unfortunately there are not many mods that have much return for the investment. I'm looking for solid 11.80's.

 

Jeff, what data or knowledge are you basing your decision upon? Maybe Steggy would be able to add some definitive data to this question? I do like the sLK32 and it has but 78k miles coming up so it should have a lot of life in it if I don't abuse it. One fellow on this site runs in the 11's and his mods are not extreme. maybe it is Chuk?

 

My GT with the Cobra motor was quite worthless in the first 2 gears as at ANY rpm the tires broke loose, 315's too, just not an R compound as the car had to make it from Syracuse to Punta Gorda.
281 c.i. makes a big difference and those motors were built, forged bottom end and 4 valve heads.

I'm just looking for info from experience. Jim has been helpful but he is running mid 10's with a V8 so we are not on the same page, not even in the same book! I do appreciate that he is not condescending. He treats me like an equal who does not have his experience. I like Rob's products but he is in business and maybe some of what he recommends is fine in a perfect world. Right now I am running TORCO full strength, 105 octane to be able to run an extra 1.5* of timing and be safe.
It seems the 62mm SC pulley was the way to go.

I thought I saw a thread where somebody nhad a machine shop turn his stock pulley for under $200. Then the piece could be hardened if tht did not make it too brittle. Just a thought.

 

Well, we know MB left room with the SC so they had no recall issues but finding where the line is.........that's the info that would put many at ease and allow others to go for it. I have seen numbers that are quite high but nothing to back them up.
There is a chart that lists the different combo's in this SRT-6 forum. Good info at least it makes the numbers easy to check quickly. I think boost monkey is running stacked, I may ask him what he has found as he seems to do a lot of research, that is good of course. One thing that Jim(mid 10's) did say that made sense is that we do not stay in boost very long. I have seen guys post that they are running really lean in the upper rpm's and that is really scarry. Doesn't take long to melt or crack a piston, forged or not.
So it is the SC rpm right now. i will try steggy this week and see what he says and post his response. mark

 

Have a look at our signatures under our posts and you will see what the stacked cars are using.
Don't start unless you are ready to spend some cash & play around a lot to get your AFR right.
I still need to play with my tune to get my mile per hour up in the quarter mile but my AFR is good.
Barry