wheres the video for that ? ive seen him run 11.7 which a stock e55 can do basically under right conditions but seen no trap speed of 120.

 

@gregMB do u know the correct gap clearance it should be installed with ?

 

potentially - but what's the weight difference between the stock crank pulley and 168 (or other) pulley? there are a few variables here and yes, probably < 10hp difference - i'd be more concerned on centrifugal forces on the crank with the bigger pulleys - hence why I went with the S/C pulley for a daily driver. Sure bigger is better but you're inducing more heat, and belt speeds...

has anyone done belt speed test differences on the different pulleys? I mean, it's just the idler pulley and tensioner - but maybe the belt speed affects the 'grip' capacity of the tensioner... hence why the belt wrap kit was born

 

I thought the info was buried on this site somewhere, maybe Shardul or Brooke can just chime in with what the target value should be?

My memory remembered it as 3 - 8mm (which in retrospect seems ludicrously large), but then I thought I saw something recently about 0.3mm as the spec. It seems like you want the absolute minimum clearance possible to keep the spring steel in the pulley from fatiguing and cracking around the rivets.... that seemed to be the failure mode when installers allowed for large clutch gaps.

-G

 

If it were only that easy, there are so many variables to this. You obviously haven't been to a track and I can see are one of those people that just "add up" horsepower ha? You can't just go off what one car did one time at some track. Just like RBJ ran 11s then packed up and went to MIR and ran 10.7s, variables my friend.

FYI, there were two E55s at a track I was at one day, they both had Eurocharged tune, both had headers and both had supercharger pulley installed and both were trapping 116. One on stock wheels with drag radials, the other on either 19s or 20s.

 

So it seems that the smaller SC pulley is a kunt hair less potent than the 168mm but you do get some benefit of not having to play around with the crank. Also the $ spent woudl be a huge gain. Actually, the $ "saved" could be used to get some legitimate headers.

So, what option do you choose"

1. SC pulley and some LT's
2. 1xx crank pulley and some shorties
I assume they woudl probably make the same power give or take

Cooling and tune to accompany both..

 

During S/C pulley installation on my car, the mechanic used an instrument to measure stock gap and then kept the pulley at the same gap. I didn't even had to use the shims whereas some people use all of them.

 

Read my sig below, and decide for yourself. And these are real track numbers, no ice on the intake, or excessive cool off periods on a private track day...this is test and tune, maybe 45 minutes cooling off, then heat soaking in line for 10+ minutes. And I've yet to run in "perfect" conditions, meaning 45F-50F dry weather with the sun out heating the track surface...but I suspect I may see 121 MPH in those conditions. Like Urban mentioned above, even with his larger crank pulley (180) vs my S/C pulley (168) we trapped the same...on the same day at the same track..Does that mean the 180 makes less power on a dyno? I bet not....He had 20's, I had BFG radials but slightly taller than stock size....The track numbers you see posted here are not always reality...meaning most guys post their best numbers, but not consistent numbers. Ya, I ran 11.70 @ 119 but if I ran tonight in the Florida heat, bet I'd be right back at 12.0@116.

 

The factory spec. gap is .35 to .45 mm. I installed mine with no shims at all and came in right at spec. However, a friend just got one of the latest batches of pulleys..his came in at .9mm with no shims, too much in my opinion..hard to explain but we bent the clutch further out by hand until his was in spec, no shims needed.

 

I haven't been to the track? Im not going to get into an argument with you, but how would you know if I've been or not? Funny you mention RBJ running 10.7 at MIR, I was there.

I have over at least 50 passes in my car. Yet I haven't been to the track? I live 30 miles from New England Dragway.

Variables? That 120 trap with a tune and smaller sc pulley was done in Texas, so If anything expect a higher trap in cooler temps.

It's clear you don't care for me, fine. But at least get your facts straight.
Your right, I run the 16 inch clks for street use lolllll

 

Anyone run at the track before/after you removed the grill? That's something I'd like to see...

Last time out my buddy kept telling me to take mine off ...I said

 

If you have been to a track to run, one would think you would be a little more educated with your "informative" comments to someone. Why would you make such an asinine statement of Joe blow did 120 with this so if you add this to that then you should do 123?

First off, ask yourself how many people have even trapped 123 with any setup, must less the lowest boosting one other than stock, then you just spout out that headers and a small supercharger pulley equals 123 or "maybe higher." The best I ever did was 120.7 with a 180 crank pulley, headers and 80mm throttle body in 60 degree weather. Many others with 180 pullies also ran 120-121 with a few a couple mph higher. A couple 168 pulley cars have done 121-122, then a stock boost, with headers and throttle body car has done 122. No cars are the same and no setups even if they are the same do the same and can do better or worse than others.

Like I said and it was confirmed above, there were 2 E55s besides mine at a drag strip all together last November at Fixxfest. Two had the supercharger pulley and Kleemann headers, my car had Kleemann headers and 180 pulley. They both were running 116, my car actually ran slower traps a few times letting it shift on its own at 6700rpm from the tcu tune and then did 115 shifting earlier in manual. Weather plays a huge role, and obviously the warm day with high humidity was hurting my heat pumping 180 more than the supercharger pulley cars, but they were also running 116 vs the later improvement of 119 by E55Greasemonkey above on a "cold" Florida night of I think it was 50.

You can't make some kind of assumption of putting these two parts together are going to do this when that is not in the slightest bit realistic.

 

Pulled this info from PSC

http://i779.photobucket.com/albums/y...Ti/photo-6.jpg

 

Joe Blow? I was referring to a forum member. You really think its an asinine statement to say that adding headers can add 3 mph in the 1/4 mile on this car? I dont.

Heres a car with Kleemann headers, 168mm pulley (which we just found out is very close to the same ratio as the smaller sc pulley) and tune trap 123.7..

https://mbworld.org/forums/5093845-post3.html

So yes, I do think tune, smaller sc pulley and kleemann headers can trap 123.. Call me uneducated I suppose.

 

You have a cool looking car, but please do not tell me you took the grill out of the hood because you were at the track.

 

gets the air to those TTM scoops faster

 

@aknight55 I've seen that vid on YouTube doesn't say a 120 trap speed.

 

I said "Joe Blow" because I don't know his name. And like I said, just because one car did one thing one time at one track doesn't mean you can just assume things, as in if you bolt on some headers and small pulley boom 123mph+ like clock work. You choose one single car that has some something like that which conveniently was also ran at the miracle track MIR with -1000ft DA during the run. Take that same car somewhere else and watch the difference. Go look on Dragtimes and see all the "Kleemann stage 5" cars with the comparable 168 and also a throttle body that none did 123 must less higher, or others with 168 pulley as well that were all below.

Prime example, the 2 cars with that exact setup that both did 116 that day, one of them did 116 a different time at a different track as well and that same one on a more ideal weather night in Florida at around 50* did 119. Then my car has never hit 121 (120.7 best) must less 123+ when I had a 180 where I would think you would assume right off the bat is going to be even faster since the big pulleys produce bigger dyno numbers (when the cars are cool). Not sure yet on the supercharger pulley since I haven't been back yet, and GT-ER the same thing only did a best of like 118-120mph with a 180 crank pulley, Kleemann setup. RBJ with a 185, 82 throttle body and long tubes was running bests of 121-122 or lower until he later added a second heat exchanger under the rear of his car and meth injection then tuned the car again. The list goes on and on, because one car did something once doesn't even remotely mean that should be the expectation of even the same car must less all others. There is a guy with headers and throttle body shaft grind on stock throttle body and stock pulley that has trapped 121, show me how many cars have done that.

 

 

you got it no 2 cars are alike thats why in 51deg weather im trapping 119.9 a click off 120 with no pulley or headers. Headers gave my lightning 3mph so why not a choked up e55 hope to get a set in the future.

 

G- That's a great chart. Thanks for doing that.

I've measured several of these pulleys and they're closer to 84mm - furthering the distance between a 168mm CP.

I'm probably missing something, but it look like Eurocharged is using the same dyno chart file for both the S/C pulley and the 172 CP:

 

now that's interesting...

 

I posted the time slip right above the video.

Your right I guess I shouldnt assume. However, your talking about cars that are running in FL. Most guys arent running in DAs nearly anywhere near as high. Heres another car with 168, headers and tune.

https://mbworld.org/forums/w211-amg/...-thoughts.html

I guess were just going to have to agree to disagree. I can tell you that once I get my Kleemanns headers on and run again this fall I expect to trap 123.

 

comparing different drivers at a dragstrip is like comparing different dyno readings - too many variables...

I bet there are some guys with 600HP cars that can't put down 1/4 mile times as good as some 500HP cars... just because of heat, conditions, driver, etc...

 

We had Jerry come over to the UK to tune 20 or so cars, there were 6 55K's that went with a SC pulley and tune. The stock runs should 2 cars at 385 RWHP and 3 were between 406-410 RWHP, the last car was 420 RWHP. After pulley and tune on the dyno the results were

2 cars that were lower base runs finished at 443 and 444 RWHP

3 cars were between 468-470 RWHP

The car the put the biggest base numbers also hit the higher overall with 486 RWHP