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c32 amg-raising the redline, camshaft-related mods?
The redline of a c32 amg's E 32 ML engine is a pathetic 6,220 rpm. There's a https://www.kleemann.dk/ camshaft that might shift the power to the right on the power(rpm) plot a little. Assuming I used race fuel, what other modifications might I be able to do that would increase/move up the rpm(peak power) and redline?
Different rocker arms made of exotic materials? Stiffer beehive springs?
I saw a post with a 6,400 rpm c32 redline. Is it true that the ports are too small to allow higher rpms? There are 9,000 rpm pushrods engines out there. Why do people swap in M113ks if they can just upgrade the cams, rocker arms, and springs to get higher redlines?
Last edited by jasontaylor7; Aug 22, 2021 at 01:45 PM.
Reason: lowered rpm by 30.
Not sure about where you read this, but a stock M112K can rev up to 6700rpm stock with just an ECU/TCU tune and some have gone higher to 7000rpm although with massive cooling efforts and upgraded cams.
V-Tech provides tunes with 6700rpm redlines but he can adjust it if required.
To make more power up top, your best bet is just better cooling, stacked crank and supercharger pulleys, bigger manifolds and maybe cams/headers.
M113K swaps are a different beast - a tuned M113K will always beat a tuned M112K in the same body.
"Not sure about where you read this, but a stock M112K can rev up to 6700rpm stock with just an ECU/TCU tune and some have gone higher to 7000rpm"
I tried doing some searches to see who got that high. No luck. Do you remember who it was, or where you saw it?
"although with massive cooling efforts"
You're saying knock prevents the advance needed for power at high rpms?
"and upgraded cams."
I asked keeman if how fast their cam could turn but didn't get an answer. Any idea who made the 7000 rpm M112k cam?
"stacked crank"
What's a stacked crank? Are you referring to putting bends in the supercharger belt to avoid slipping? Or does that mean a more balanced crankshaft where you drill holes until it's more balanced?
"M113K swaps are a different beast - a tuned M113K will always beat a tuned M112K in the same body."
True and it's a little eyebrow raising to see that the C32 AMG was already boosted up to 1 bar stock. For comparison, the stock boost on a supercharged buick regal GS (about same manufacturing date) was only 6-8 psi (about 1/2 bar)! IMO this was why the suits had to fully take over in 2005. But if you are going to swap an engine obviously it's ~20x more work, largely due to the electronic issues with doing so, and it makes more sense to get a different car.
Last edited by jasontaylor7; Aug 22, 2021 at 02:53 PM.
"Not sure about where you read this, but a stock M112K can rev up to 6700rpm stock with just an ECU/TCU tune and some have gone higher to 7000rpm"
I tried doing some searches to see who got that high. No luck. Do you remember who it was, or where you saw it?
"although with massive cooling efforts"
You're saying knock prevents the advance needed for power at high rpms?
"and upgraded cams."
I asked keeman if how fast their cam could turn but didn't get an answer. Any idea who made the 7000 rpm M112k cam?
"stacked crank"
What's a stacked crank? Are you referring to putting bends in the supercharger belt to avoid slipping? Or does that mean a more balanced crankshaft where you drill holes until it's more balanced?
"M113K swaps are a different beast - a tuned M113K will always beat a tuned M112K in the same body."
True and it's a little eyebrow raising to see that the C32 AMG was already boosted up to 1 bar stock. For comparison, the stock boost on a supercharged buick regal GS (about same manufacturing date) was only 6-8 psi (about 1/2 bar)! IMO this was why the suits had to fully take over in 2005. But if you are going to swap an engine obviously it's ~20x more work, largely due to the electronic issues with doing so, and it makes more sense to get a different car.
Cooling efforts not just for knock, but mainly due to intake air temperatures rising to the point that the car pulls timing and you won't make more power at the higher RPM limit.
There may be better cams out there, not sure on this myself as the gain from cams is limited given the cost.
You cut me off short - Stacked Crank and supercharger pulleys - Means having both a larger crank pulley and smaller supercharger pulley to increase boost.
I suggest discussing the RPM limit with V-Tech, he knows best here given he's tuned all of the higher revving M112Ks.
Thanks. Great info as always. I examined the video at both shift points. Shifting is often TCU not ECU but the highest it I think it showed was about 6,700 RPM I think for both the 1st to 2nd and 2nd to third shifts. Oh well.
The phrase "stacked crank" makes some sense. I searched for an enlarged harmonic balancer for the 3800 and didn't see anything. Search terms matter. Then again, I searched for "stacked crank" and also didn't see anything. But making the SC pully smaller will increase the tension way out of spec and probably cause a lot of issues with things like bearings on the tensioner. Much better to increase the diameter of the pully on the harmonic balancer/crankshaft.
Oh by the way. I am not sure the facebook page is working right now. Here's a screenshot:
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
