rflow306

A lot of the standalone ecu's ie aem, speedpro, accell, big stuff and others have individual cylinder correction for timing and fuel.

The newest thing to hit the mainstream is ionization cylinder correction. I think the new m5's have it. You can spray 120 hp dry kit and it will automatically add fuel and keep afr's close to stock. It responds extremely fast i was definitely in-pressed. I wonder if the system on the sl55 is the same way.

If you have time check out this study conducted in 2002 concerning the subject http://www.vehicular.isy.liu.se/Publ...LIC_962_IA.pdf

Grumpy666

I believe that is Steve is referring to MB's new cylinder-selective pilot control of the firing angle from their press release:

To me, this could be either retarding the timing of individual cylinders based on detonation detection, or optimizing timing based on the current draw of the spark plugs.

BMWEATR

not to make to big of a deal about your run, but i am skeptical of your run, I think the timming is off at the track you were at, you were also on st tires if i remember, and though you did have good weather the st tires really puts a question mark in my head about something is not right about that run, but hey i could be wrong.

stevebez

Hey vrus,

Sounds like this "new" SL has the TB mod you are working on ... so supply of parts might be a bit easier ?

E55 RUSS

Hi...glad at least someone has them...

Please tell ME more...

What power increase ???

Any dyno results ???

Did you remove primary CATS ???

Did you tune your ECU ???

Thanks

E55 RUSS

What NOS set up do you run ???

Been told by Vadim ...70-80 shot NOS used not very often would be OK for E55 motor...

thinking about it...which is best set up ???

vrus

Hey Steve,

When I started this project, the first thing I tried to do was purchase the 2007 SL55 TB but no one had Part #s for it yet and it wasnt in the parts order system so I couldnt get it.

It might be another alternative to what I am doing, or for all we know, it might actually be the same parts that I am using and just revived for the 2007 model.

rflow306

It's a combination of three things good weather, good track and r compound tires. If you look at his incremental everything is in-line. http://www.dragtimes.com/Mercedes-Be...ag-Racing.html.

RJC

I don't think the stock AMG part is really a header but more of a exhaust manifold

ProjectC55

I'm trying to figure out the design of the klemann headers I just received and if I'll see an increase in Hp.

jangy

You will likely see gains, IF it is also tuned. The K headers are not shortys so it is laborious and takes out the cats. It should, however, give you about 10hp more than shortys. i just don't want to go smog illegal for 10hp and I like bolt ons, so RennTech it is.

Kev04C320

I think the Evosport headers are designed better than the RENNtech ones. The RENNtech one looks like they didn't even bother to try to make it equal length

jangy

Has anyone done a comparison of the two? RennTech people seem happy with theirs as do EVO ones. I wonder if the gains are similar or different? I was holding a set of RennTechs yesterday, and yes the lengths are varied, but the quality looks really nice. Actually, it is the same for the TB. I like the ported and polished inerds.
With headers, I guess ultimately reliability and performance is what matters over looks, though. Any dyno results out there?

Kev04C320

The dyno numbers won't mean anything coz there are too much variables invovled. In this case, I'd say go with the one that you're comfortable with.

Yacht Master

Back in the day Textron Lycoming had to come up with a insulating material for its AGT 1500 gas turbine. This turbine has a huge recuperator on it to maximize the thermo efficiency. They developed a material much like the tiles on the space shuttle in that, a half inch layer will net, 1500 F on one side 70 f on the other. They kept this a secret as it was one of the prime ingredients of the M1A tank. It is now de-classified and in the public realm Marine exhaust fabricators now use this extensively.

This is a true thermo block and could be applied to any header, you could do the primary cats too. I don't know how much it would drop the under hood temp. We have used this in some trick turbo installs on boats it works 100%

This is the guys I use in Lauderdale.

http://www.mmxhaust.com/

I Love the banter on this thread, but guys at the end of the day we have no room to do most correct, all the headers discussed are a compromise.

jangy

I agree that all the headers we have available have some compromise. Hell, they are shortys for a reason. I do like the coating idea. i wonder if RennTech would consider letting me treat a set before I have it installed? What are the disadvantages to the coatings from a product standpoint? For example, does it make the product more susseptible to cracks? If it is simply a cost factor, I don't mind paying the premium BEFORE install, rather than wishing I had it after.

vader

Cool site...I wonder if they could build a few sets of blankets for our stock manifolds...

Yacht Master

I hear RennTech would do any thing for you . As far as disadvantages the process makes the part a half to three quarters of an inch larger, so fitments could be an issue. I can't speak for the material that RennTech is using or the process in welding that they use, but if they crack with out coating. they may crack with it. Some could argue that the thermo cycle would be less drastic therefore prolonging the life of the already annealed weldment. I have used 316-L stainless with no cracks.

jangy

For me? where did you hear that? Or is that the rumor? RennTech has simply acted professional and dealt with my car. They still have not given me my hug, but i wanna move on. don't confuse that with Renttech caving in.

Yacht Master

Vader,

I am sure they could, with or without the factory heat shroud, just a question of getting a manifold to make template. In most cases the blankets are reflective silver and held in place by riveted hooks and wire.

vader

Was it the blankets you were talking about in your original post Yacht or a coating. Looks like those blankets are a real good option and I am sure someone here who installed header can come up with a pair of original mani's to provide a template....hi-tech blnket may eliminate a lot of that underhood heat. I admit I have not been able to look underneath and see if it would even be possible to install them is we had them.

Yacht Master

Vader,
In my original post I was referring to a coating it is about a half inch thick and would benefit the headers more, in that they are larger, more complex and get just as hot. The finish surface is much like fiberglass but wont burn. The header would have to be coated before installation on the car. The blanket on the other hand could be installed without removing the stock manifold.

In our installations the coating keeps heat in the manifold before the turbo this maintains maximum boost, and red-hot pipes are a fire hazard for us. Also after the turbo the coating on exhaust system helps to maintain a cool engine room. When running 90% load on a 2800 HP. diesel W/twin turbo W/ bypass blowers you can touch any part of the exhaust system and it is just warm, TIT / EGT 950-1040 F.

stevebez

err... what turbo ... we aint got any turbo's?

psk145

I think he's referring to something else, as we dont run diesel either nor do we have 2800 HP

ROCKETW19

who dosnt have 2800hp? dont we all? i know i do.