supercharge m104
I have been building a new engine this winter. Custom CP pistons and polished and shot peened the stock rods. Still going together.
I've installed a eaton m90 on my 260E m103 engine and I've been having problems with my serpentine belt. When I accelerate the car the belt tensioner tensions the belt, the problem is when the engine slows down, the tensioner damper takes too long to go back to the original position and it busted the supercharger bearings. Did you have the similar problems with your belt tensioner?
The Best of Mercedes & AMG
http://www.m3post.com/forums/showthread.php?t=126523
so it seems that the c63 and bmw m3 are tested in mags and run around 12.5, so well done.
Got any other links anywhere with more info/pics on your work? I'd appreciate it!
The one thing about this that rings true is that I WANT torque at low RPM's, as most of my driving is done there. Even now, I don't usually shift past 5500 rpms. I just inherently don't like redlining this engine, I don't feel it likes it that much.

You mentioned throwing on some slicks... are you running street tires now (not drag radials)? If so, check into the lightest race tires you can find. I'm using Hoosier DOT drag radials, they are super light weight compared to anything else (Nitto, BFG, MT, etc are all very heavy). If the car is hooking up with drag radials (or even street tires), you won't gain anything unless you switch to wheels or tires that weigh less.
Are you getting any wheelspin at all with your launch now? Also, what is your typical 60' time?
This is with street tires. Continental all seasons even. I was running 2.0-- 60' but the 12.511 was with a 2.030. A little wheel hop on that run but not spinning. I have to throttle the launch and I pulled a lot of timing out of the map to reduce torque on the launch. Makes the car much nicer to drive that way also. Pretty tame throttle response. I am going to get some slicks soon and try and get a good 60'. I think that with headers and slicks and a few lbs of boost at the end I will be in the 11.-- for sure. Slicks should get me in the low 12.--s. I was also going to put my 17" tires on the frt with a smaller tire. If I could fit them still I would through on some 15". But overall not to bad as is with the setup I am running. Did you see Kynsi ran an 11.5 with his turbo setup over on the other forum?
This is with street tires. Continental all seasons even. I was running 2.0-- 60' but the 12.511 was with a 2.030. A little wheel hop on that run but not spinning. I have to throttle the launch and I pulled a lot of timing out of the map to reduce torque on the launch. Makes the car much nicer to drive that way also. Pretty tame throttle response. I am going to get some slicks soon and try and get a good 60'. I think that with headers and slicks and a few lbs of boost at the end I will be in the 11.-- for sure. Slicks should get me in the low 12.--s. I was also going to put my 17" tires on the frt with a smaller tire. If I could fit them still I would through on some 15". But overall not to bad as is with the setup I am running. Did you see Kynsi ran an 11.5 with his turbo setup over on the other forum?
You want to go with a tall narrow tire inflated to about 45-50psi
The taller the tire the more roll out time you have before you break the red light beam.
If you have great reaction time this may appear that you're a bit slower.
You could pick up about a tenth+ with a tall front tire and learning how much the tree will allow you to roll !!!
Below gives you an example of how much roll out you can gain:
Size Diameter Overall Rollout Overall
23.0x5.0-15 23.0 inches 72.2 inches
24.0x5.0-15 24.0 inches 75.4 inches
25.0x4.5-15 25.0 inches 78.5 inches
26.0x4.5-15 26.0 inches 81.7 inches
27.0x4.5-15 27.0 inches 84.8 inches
28.0x4.5-15 28.0 inches 88.3 inches
The rims are not to heavy but tires are. A skinny 185 series tire would be ideal. I was thinking of a 215 or 205 on the 17" amg rims
This is with street tires. Continental all seasons even. I was running 2.0-- 60' but the 12.511 was with a 2.030. A little wheel hop on that run but not spinning. I have to throttle the launch and I pulled a lot of timing out of the map to reduce torque on the launch. Makes the car much nicer to drive that way also. Pretty tame throttle response. I am going to get some slicks soon and try and get a good 60'. I think that with headers and slicks and a few lbs of boost at the end I will be in the 11.-- for sure. Slicks should get me in the low 12.--s. I was also going to put my 17" tires on the frt with a smaller tire. If I could fit them still I would through on some 15". But overall not to bad as is with the setup I am running. Did you see Kynsi ran an 11.5 with his turbo setup over on the other forum?
The 17" AMG wheels may be heavier than you think - could be 24-25lbs! You'll need to find the lightest weight wheel that still clears your brakes, then spoon on the lightest tire. The weight has FAR more effect than the width. Don't worry about wind resistance with a "wide" tire, you're only going fast enough for wind resistance/drag to do anything for a short period at the end of the strip (around 100mph); the weight makes a difference over the entire 1320'.
Didn't see the thread on Kynsi and the 11.5 time... got a link?
It feels as if I installed a lighter flywheel, if that makes any sense at all... Felt the same as when I shaved the M30's flywheel.
I'd also enjoy a link about another turbo charged W124, if for nothing but entertainment.


