Well, she is in, and everything seems to be working perfectly. Just have to iron out a few little things. Car has sat for awhile, so it needs to be ran and let everything come together. Time for testing and tuning. It saw 3 good but not hard passes up to 150. Not ready to launch her hard yet. That will come in a few days. I will keep you all posted, but first impressions are very good. I had to replace the inner cooler pump, as time sitting locked up the factory original. Fixed the tranny plug leak. Put on the s/c guard, and checked the s/c out. It still looks fine. Nothing loosening up. So...I think there are 3 of us with this gear now. I can tell you all this. The half mile event, ole blue will top out in a half mile now. Although the road wasn't there for me tonight to completely top it out, it looks to be 160 @6200. I will have to get back to you on that, but I think that is where we will land.

 

Glad you can check that off the "to do list"
When did ya see Rudy ?

 

Last Friday night while you were enjoying the Dragon meet...lol Finished it tonight. I really like the gearing. Need to run it and see if we can get it shifting a little quicker on the hard passes. Had it not been for the Red Bull Air Races at Indy, I might have come on down Saturday. I will make the spring meet this next year. You are right. Time to start slowing down. Not the car, me...lol.

 

Glad to hear Doc!
I'm jealous of your private test track that allows you to run up to 150

 

0.83 (5th) x 3.46 (diff) = 2.87 overall ratio
On new255/35/19's = 2,077mm circumference
@ 6200rpm = 269kph or 168mph.

MB owners should note - the 245/45/17 rears on the SLK32 are 1,972mm circumference or 0.9617 the circumference.
That would bring the 168mph down to 159 at 6200.
If you use the same calculation - Stock SRT6 =190mph @6200 - but no ones achieved that AFAIK.

But top speed is not the goal here obviously.

Appreciate any corrections if noted.

 

cool mod, I'll wait for the dragstrip testes if you share the difference between the stok 3.07 and 3.46 gears (you were running 3.07 before I guess, or 3.27? )

I'm thinking of putting 3.46 on my slk too, but I'm afraid of start issues on dragstrip, we don't have proper dragstrip with glue, so it's hard to push the car from the start. I only get 0-60 is 2.2 or 2.4 as I remember.

bob the slk-s have 245/40 stock size, not 245/45.

 

cool mod, I'll wait for the dragstrip testes if you share the difference between the stok 3.07 and 3.46 gears (you were running 3.07 before I guess, or 3.27? )

I'm thinking of putting 3.46 on my slk too, but I'm afraid of start issues on dragstrip, we don't have proper dragstrip with glue, so it's hard to push the car from the start. I only get 0-60 is 2.2 or 2.4 as I remember.

bob the slk-s have 245/40 stock size, not 245/45.

 

typo only - calc is good for 245/40/17's....

 

Glad you got it in Doc. Results in the 1/4 and 1/2 mile will speak for themselves. About the shifting. I had the same issue with a raised rev limit and Evoteck TCU and to a lesser degree with the 3:27 with a you know who TCU. I'm really hoping you get it squared away quickly.

Les

 

Thanks Les. It isn't really bad, but not where I would like it. Rob, yeah, my test track no longer has to be very long to acquire 150-160...lol. I am really liking this gear. And yes, I had a 3:07 stock before.

 

Congrat.'s on getting that diff. installed Doc. I look forward to hearing your new times, Subscribed! You have once again upped your fun factor.

 

Rudy keeps thinking up new mods while he sleeps. Having the knowledge to make your computer accept your 346 ratio without going into limp mode. Your going to have fun with that gear,I'm sure. Now Rudy's in the process of setting a 3 liter Wiestec blower onto a modified SL 55 with a modified transmission from a V-12 BiTurbo to drop down into a Crossfire. I don't think we have found our cars limit just yet. Squirrel Crusher

 

LOL....no, Rudy is always dreaming. Speedriven has a little to do with the work as well. So Marcin has my thanks as well. The coupe is responding more and more as I romp on it. I think the ECU is still learning. I'm on the fence to go ahead with a modified valve body. I think the more I drive it, the more I think that would finish things off. I need to look for a boost leak. May just be me, but I just don't think the car is pulling as well as it should. But, even with that, I love the coupe even more now. It's like having a new car all over again.

 

I have 285/40/19 on the coupe. But I may change to a 275/40/19 from my roadster. The run flats just don't hook up at all. If I drive to the 1/2 mile event, I need road tires. Too far to drive on drag radials.

 

Doc, what car did the 3.46 differential come out of? Is it a straight out swap, or did you just change the ring and pinion? Do you still have your wave track?

 

Older model Benz. Not a straight swap. A spacer has to be machined, and set up of the ring and pinion has to be shimmed perfectly. A yes the wave trac remains in there. TCM has to be flashed to accept the new gear ratio. Really loving the car right now. Picture your old AMX with a 4.88...lol Only we go all the way to 160.

I might add, this gear swap coudn't have been done without Jim and Rudy. Speedriven helped as well. It isn't cheap by no means. This is my only real toy. So this is what I thought the car needed since I bought into these cars. Always a believer there is no reason or place to run 180 mph. Nor is it done in a short distance. Unless you live in Germany. I wanted to maximize the car in a half mile. It is more realistic, and hell of lot more fun. I like drag racing, but this gear would be great on round track. Cost? Well, you could combine all the other mods listed below on the car, and you wouldn't be there....

 

Interesting.....So what you have achieved with those tyres and diff combo is a stock SLK32 setup.
No skite intended....

Your final 5th gear ratio is 0.83 x 3.46 =2.87
Stock SLK32 = 0.83 x 3.07 = 2.55
or 2.87/2.55 = 1.13 ratio

But your tyre setup is 2,232mm circumference for your 285/40/19's versus
the SLK32's 1,972mm
2232/1972 = 1.13 ratio.
So they cancel each other out.....

Very interesting.....
Unless I'm missing something not so obvious....

The 275/40/19's would give you 2207mm.

As always - comments/corrections welcomed.
-------
PS - circumference calc can be a little different between manufacturers, but basically....
Overall diameter = Rim Diameter + 2 x [track width x profile as a percentage].
so for a 285/40/19
19" Rim dia. = 482.6mm
Overall Diameter = 482.6mm + 2 x [285mm x 40%] = 710.6mm

Circumference = PI() x Diameter = 3.1416 x 710.6 = 2,232.4mm
-------

 

I hope you enjoy it as much as we do....

 

Just to let you all know I have ONE 346 left,, with tcu and wavetrac ,,,,,,,, ,this one is at the price below,, anything after that the price will most likely go up . jim

PS doc. I will be returning to the track soon with my 346,,, lets see some low 60 ft numbers.


https://www.crossfireforum.org/forum...-280-00-a.html

 

Your sign indicates "TCM & 327 gears"...is that correct?