W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Renntech pulley and ECU questions

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Old Apr 7, 2006 | 03:15 AM
  #1  
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Renntech pulley and ECU questions

I was recommened to come to the E55 board for this.

Ok a couple questions. We installed the pulley and ECU on a '03 SL55 yesterday. A few concerns, we picked up only 17 rwhp non-corrected. 413 base line and 428 after. What are we supposed to pick up with this mod?

Another question, we did not actually drive the car after the install, we pulled it from the lift to the dyno and ran it that way, would the car need to be driven for the ECU?

What non-corrected numbers should a SL55 put down with this mod?
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Old Apr 7, 2006 | 07:47 AM
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You should definately pick up more then that...

May be need to re-program ECU again and something wrong with a car...
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Old Apr 7, 2006 | 08:09 AM
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Originally Posted by VegasAMG
I was recommened to come to the E55 board for this.

Ok a couple questions. We installed the pulley and ECU on a '03 SL55 yesterday. A few concerns, we picked up only 17 rwhp non-corrected. 413 base line and 428 after. What are we supposed to pick up with this mod?

Another question, we did not actually drive the car after the install, we pulled it from the lift to the dyno and ran it that way, would the car need to be driven for the ECU?

What non-corrected numbers should a SL55 put down with this mod?
Well, I have the Renntech ECU, pulley, and headers on my E55 and it feels like I am running stock times at the track. The best I can run is 12.1. While it feels a lot faster, I unfortunately didn't have the chance to track the car before I got the work done. I plan on taking the car to the track again in another month or so, and unless I can run mid 11s, I will be calling Renntech. (or maybe Cory at Kleemann)
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Old Apr 7, 2006 | 08:16 AM
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Sounds like mapping is POS... you will definately have more boost - u just not using it.

Rgds Steve.
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Old Apr 7, 2006 | 08:25 AM
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Originally Posted by VegasAMG
I was recommened to come to the E55 board for this.

Ok a couple questions. We installed the pulley and ECU on a '03 SL55 yesterday. A few concerns, we picked up only 17 rwhp non-corrected. 413 base line and 428 after. What are we supposed to pick up with this mod?

Another question, we did not actually drive the car after the install, we pulled it from the lift to the dyno and ran it that way, would the car need to be driven for the ECU?

What non-corrected numbers should a SL55 put down with this mod?
I have seen that happen with some cars. Try re-setting the ecu first either by disconnecting the battery or the pedal method (do a search). The final thing to do is to hook up an obdII scanner and read the IAT's at WOT to make sure they are in-line.
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Old Apr 7, 2006 | 09:25 AM
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Renntech --- Doesn't suprise me.
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Old Apr 7, 2006 | 09:30 AM
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Do what rflow306 says. The only way to know is to check out the IATs and your A/F to make sure everything is correct.

Post a copy of your dyno chart so we can see the A/F curve.
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Old Apr 7, 2006 | 11:27 AM
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Originally Posted by VegasAMG
I was recommened to come to the E55 board for this.

Ok a couple questions. We installed the pulley and ECU on a '03 SL55 yesterday. A few concerns, we picked up only 17 rwhp non-corrected. 413 base line and 428 after. What are we supposed to pick up with this mod?

Another question, we did not actually drive the car after the install, we pulled it from the lift to the dyno and ran it that way, would the car need to be driven for the ECU?

What non-corrected numbers should a SL55 put down with this mod?

just the pullies alone would of yield at least 30wHP...


also run the car hard and let the ECU compansate for the new found boost.. then perform the dyno.

make sure the car is not TOO hot when doing yor runs...
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Old Apr 7, 2006 | 01:38 PM
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Thanks guys, the intake temps were at 200 I think. The dyno corrected was 495 and 428 non-corrected. I will post a dyno sheet when I get it. The car feels alot faster though.

Renntech is paying for us to re-dyno the car in Vegas. They are also going to have us reload a new program. We will see what happends.
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Old Apr 7, 2006 | 02:18 PM
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Originally Posted by VegasAMG
Thanks guys, the intake temps were at 200 I think. The dyno corrected was 495 and 428 non-corrected. I will post a dyno sheet when I get it. The car feels alot faster though.

Renntech is paying for us to re-dyno the car in Vegas. They are also going to have us reload a new program. We will see what happends.
If the IAT reached 200 then your supercharger was disengaged. 199 is the cutoff point..After that the ECU will disengage the supercharger.
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Old Apr 7, 2006 | 02:30 PM
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Originally Posted by VegasAMG
Renntech is paying for us to re-dyno the car in Vegas. They are also going to have us reload a new program. We will see what happends.
that's great to hear!
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Old Apr 7, 2006 | 03:34 PM
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Originally Posted by vrus
If the IAT reached 200 then your supercharger was disengaged. 199 is the cutoff point..After that the ECU will disengage the supercharger.

Wow really?
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Old Apr 7, 2006 | 05:09 PM
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Originally Posted by VegasAMG
Wow really?
VRUS is the man... he probably can build a 55k motor by now.

he knows what he is talking about.
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Old Apr 7, 2006 | 05:50 PM
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Originally Posted by TopGun32
VRUS is the man... he probably can build a 55k motor by now.

he knows what he is talking about.
Another one up for vrus. He knows a lot and contributes a lot of knowledge to the forums.
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Old Apr 7, 2006 | 06:04 PM
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I had a RennTech pulley and ECU installed by Renntech in Florida on my E55 about 2 months ago. It made a huge difference in power.

Although I don't really rely on dyno numbers due to the amount of variables, I was impressed that my car is now trapping at 121 mph without any other mods. Not many can say that. I am still waiting to see a Kleeman run at Moroso.

In any event, my car picked up a little over 50 rwhp and 60 rwt.

Last edited by SGC; Apr 7, 2006 at 06:06 PM.
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Old Apr 7, 2006 | 06:17 PM
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Originally Posted by dragonAMG
Renntech --- Doesn't suprise me.
Gang: has anyone done 'Test&Tune' at Milan raceway in MI? I had my beast there twice this week and can't break 12.3! My rxn time is ok for a 54 y/o human but my 60' suck at 2.2. This has been since my K2/LSD upgrades. IMHO it has so much power now that due to the wheelspin the power is killed on launch.Trap speeds are 118. Before the K2 work I was getting 1.8 and 1.9 60' times. HELP! Any recs? Would drag radials make a diff? Anyone else with these issues? Thanx-Joker
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Hmmmmm......

I don't know if I would be so critical of RennTech.
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Old Apr 7, 2006 | 10:09 PM
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Originally Posted by SGC
Gang: has anyone done 'Test&Tune' at Milan raceway in MI? I had my beast there twice this week and can't break 12.3! My rxn time is ok for a 54 y/o human but my 60' suck at 2.2. This has been since my K2/LSD upgrades. IMHO it has so much power now that due to the wheelspin the power is killed on launch.Trap speeds are 118. Before the K2 work I was getting 1.8 and 1.9 60' times. HELP! Any recs? Would drag radials make a diff? Anyone else with these issues? Thanx-Joker
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Hmmmmm......

I don't know if I would be so critical of RennTech.
I totally agree with SGC. Why do people always feel the need to put someone elses product down. Take it to the track the only true dyno.

I have seen sgc car's run 120 to 121 mph trap speeds at Moroso with a renntech chip and pulley and can also vouch for his exhaust being stock.
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Old Apr 7, 2006 | 11:39 PM
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Originally Posted by rflow306
I totally agree with SGC. Why do people always feel the need to put someone elses product down. Take it to the track the only true dyno.

I have seen sgc car's run 120 to 121 mph trap speeds at Moroso with a renntech chip and pulley and can also vouch for his exhaust being stock.
I think Dragon had experiences from when BennyZ had pretty much the RENNtech version of Dragon's Kleemann W203.
BennyZ car had a lot of issues (I believe).
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Old Apr 9, 2006 | 09:00 PM
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Just an FYI... There are a diverse group of users on this board who are running modified 55K motors that were supplied from all of the different vendors out there. There have been problems with EVO cars, Kleemann cars, Renntech cars, etc.

Nothing is perfect out there.. It's all about how the vendor treats the customer when there IS a problem. You can tell a person's/vendor's true colours when problems arise.

This Renntech car we are discussing probably has some underlying issue that didnt come up right away and now it is under-performing.. I am sure Renntech will step up and take care of this problem. They are a reputable tuner (albeit rather expensive for what they provide) from what I have heard.

Just my $0.02...

Originally Posted by dragonAMG
Renntech --- Doesn't suprise me.

You guys are both too kind! Thanks for the nice words.

Originally Posted by TopGun32
VRUS is the man... he probably can build a 55k motor by now.

he knows what he is talking about.

Originally Posted by ricky.agrawal
Another one up for vrus. He knows a lot and contributes a lot of knowledge to the forums.
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Old Apr 9, 2006 | 10:34 PM
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my car will be at RENNtech this week if they can get me in...

pulley, ecu, before/after dyno.... then another track rental at Moroso.....
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