Quote:
Originally Posted by jliu  should be taken with a grain of salt. |
Well the Renntech one makes like 490hp? That seems more reasonable. I can't see a 230hp gain with sub 7lbs of boost. Not to mention running that much more hp on stock pistons. What kind of pistons does mercedes use? Are they forged? I suspect the ones in the SL55 are forged on top of being lower compression ones. Because if they are Hypereutectic pistons in the SLK55 they won't last under boost. Manufacturers use those now for emission reasons vs forged in many applications. I had a set in the first short block I had for mustang and they lasted about 8,000 miles before one ended up with a hole in it, this running 8-9lbs of boost. I now run a racing block and forged pistons...
Is the engine in the SLR the basically same one as the SLK55? Except for blower and dry-sump(and probably pistons)? So I guess it's possible the kleeman makes almost 600hp.
Shame nobody sells a higher rear gear for the slk, dump the 3.06 and get like a 3.55 it would help a lot. Of course MPG would suffer slightly.
Pp