RENNtech pulley kit 550$ :(
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
They don't really tell you enough. Eddy current units are great & accurate - but what they need is a small cooling tower on the roof or wherever so that they can control inlet air temperature. They don't talk about this.
The warmer the inlet air the less the power.
The warmer the inlet air the less the power.
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From: California
03 W203, 13 E350, 13 W204, 14 C218
Hmmm interesting...now regretting the purchase because basically it sounds like wont find a Dyno worthy of a "Real" test and thats the reason for me doing this...for a "Real" test.
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
I'm sure you will find a suitable Dyno. Go & talk to the guys. Just don't let them BS you. Is there not an institute of learning with a dyno somewhere in the area. I'm sure that they would love a project like this.
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From: the ML/GL/R assembly line
2005 C230 Kompressor
Making more power will require more fuel if the original fuel and spark map was optimal for the original mods compared to the new mods having a new optimal fuel and spark map. 14.7:1 is whats class room textbook optimal but in the real world you will melt the engine down that lean especially in a boosted application. N/A engines make the best power at 13:1-13.7:1 A/F and boosted engines around 11.7-12.4:1 in a general "rule of thumb" bases, anything leaner than that may bring very small amounts of additional power but also bring along lots of less durability. The harder you run your horse the faster it will die is still a valid statement. Anytime you can change pullies out to spin the supercharger faster will increase boost and more power but there is a break over point on that idea. A given size supercharger can only be spun so fast until it starts heating up the air too much for optimal power production of said amount of boost. The factory fuel maps can handle only so much additional boost and after that point it will run too lean for optimal results so a ecu reflash is required for optimal power and reliabilty.
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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Making more power will require more fuel if the original fuel and spark map was optimal for the original mods compared to the new mods having a new optimal fuel and spark map. 14.7:1 is whats class room textbook optimal but in the real world you will melt the engine down that lean especially in a boosted application. N/A engines make the best power at 13:1-13.7:1 A/F and boosted engines around 11.7-12.4:1 in a general "rule of thumb" bases, anything leaner than that may bring very small amounts of additional power but also bring along lots of less durability. The harder you run your horse the faster it will die is still a valid statement. Anytime you can change pullies out to spin the supercharger faster will increase boost and more power but there is a break over point on that idea. A given size supercharger can only be spun so fast until it starts heating up the air too much for optimal power production of said amount of boost. The factory fuel maps can handle only so much additional boost and after that point it will run too lean for optimal results so a ecu reflash is required for optimal power and reliabilty.
I'm very interested in your experience. Are the AF ratios you quote above and your comments based directly on MB Kompressor engines - Do they not like running lean? I know that they have sensitive cylinder heads but problems in that regard have generally been explained by them requiring 95 Octane Eurograde fuel. (Narrow distillation curve)
Do you consider your comments accurate in the lean burn era (leaner burn - I'm not talking way off stoichiometric - not 22 to 1 area)
Last edited by Glyn M Ruck; Oct 27, 2008 at 03:02 PM.
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W203
Unless I'm mistaken, this should be in the classifieds section, then I'd be free to make my own thread to sell rather than post in his thread. Since its not, its in the W203 section, its open to discussion. If you don't like my post, there is an ignore button, yet what I did certainly is not wrong.
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W203
actually no i don't work on cars i pay people to do that... you need a job??? and yeah i'm sure you didn't want to write "silly," so hopefully you make it out to the show on the 11/15 and maybe you can say what you really wanted to... ill be at the DJ equipment most of the time and my name is Roland, why dont you come up and ask for me..
Get your pretty manicured hands off the DJ equipment and try turning a wrench.
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W203
The gains are all in the low end, and you'll feel that instantly when you hammer the gas for the first time.
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W203
MBWorld Fanatic!
Joined: Jan 2008
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From: So Cal... In between LA and OC
2005 CLK320 Vert & 2005 CLK55 AMG
like i said before why do i need to work on my own car, when i can pay someone to do it... im not a mechanic, and i dont claim to be. for someone who thinks he knows everything about cars you sure dont know shiet...
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From: So Cal... In between LA and OC
2005 CLK320 Vert & 2005 CLK55 AMG
i emailed Renntech last week about this pulley kit, they got back to me this morning. Let me know what you think.
this is part of the email i sent:
re:2005 C230 Kompressor, chassis:W203, engine:m271
I hear there is a 10-15 hp gain between 2-4k, 5hp 5k and up. Are these numbers correct or close to the truth? I also wanted to know if it effects the mpg and if you have numbers on that.
the reply i got:
"I hear there is a 10-15 hp gain between 2-4k, 5hp 5k and up." That seems about right, you might also get a little better mileage at cruising (2 )
Will have more torque at lower rpm.
It works well.
not really a definite answer on anything...
look amanonfire, look what Renntech themselves wrote: "you might also get a little better mileage at cruising"
feel free to email them yourself...
so i guess me asking the question here in the forum, was a good question right?? yeah youre right it was a silly question, since they claim it does and you don't, you must be right and we should just take your word for it.
this is part of the email i sent:
re:2005 C230 Kompressor, chassis:W203, engine:m271
I hear there is a 10-15 hp gain between 2-4k, 5hp 5k and up. Are these numbers correct or close to the truth? I also wanted to know if it effects the mpg and if you have numbers on that.
the reply i got:
"I hear there is a 10-15 hp gain between 2-4k, 5hp 5k and up." That seems about right, you might also get a little better mileage at cruising (2 )
Will have more torque at lower rpm.
It works well.
not really a definite answer on anything...
look amanonfire, look what Renntech themselves wrote: "you might also get a little better mileage at cruising"
feel free to email them yourself...
so i guess me asking the question here in the forum, was a good question right?? yeah youre right it was a silly question, since they claim it does and you don't, you must be right and we should just take your word for it.
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Joined: Jan 2008
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From: So Cal... In between LA and OC
2005 CLK320 Vert & 2005 CLK55 AMG
when a question is asked on this forum most people come with a suitable answer and tell you the reasoning behind their answer, but this guy just comes out and clowns the question... whats up with that???
but again you're right... no more words from me...
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
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From: California
03 W203, 13 E350, 13 W204, 14 C218
I did but I don't want it now because I was just getting it to do dynos for the form so everyone would quit arguing about it but now people are saying that its not worth the money to dyno and that its hard to find a sophisticated enough dyno so i told big rat and he said i put him in a hard position because i sent the money at like 3am this morning and by 345 i sent him the e-mail saying i didnt want it because everyone started replying about not getting good dynos and not being worth dyno testing it but its a good performance part. but he says i put him in a hard spot because someone wanted to buy it and he said it was sold even though the money is still unclaimed on paypal so i told him if this is his HONEST story then i guess i will take it but really have no use considering my car is slammed now and i dont speed cuz i like my front bumper haha. so if u want it let him now. the item hasn't been shipped and my money is still unclaimed.
I am not calling him a liar i just feel the possibility of me buying and item at 3am and someone else at the same time and him being on within that 45 minute time span to tell the other person that it is sold all while not participating in the forum where we were going back in forth during that 45min and not replying sold in the forum is a little fishy...but if im right i think he is a soldier and i told him i know he has integrity so im assuming hes not lying about this incident
Im talking to him through PM's right now he's a cool dude! So I doubt this is the case..
I am not calling him a liar i just feel the possibility of me buying and item at 3am and someone else at the same time and him being on within that 45 minute time span to tell the other person that it is sold all while not participating in the forum where we were going back in forth during that 45min and not replying sold in the forum is a little fishy...but if im right i think he is a soldier and i told him i know he has integrity so im assuming hes not lying about this incident
Im talking to him through PM's right now he's a cool dude! So I doubt this is the case..
Last edited by paypaboi; Oct 27, 2008 at 03:20 PM.
Senior Member
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Posts: 363
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From: the ML/GL/R assembly line
2005 C230 Kompressor
I am interested in your post. I come from the oil industry and have racing experience. We have run many modern lean burn engines at 14.7 to 1 and leaner with excellent performance, temperature control & durability so I was talking from my experience - not text books. Frequently find tuned engines very happy at about 14.1 to 1 (not blown)
I'm very interested in your experience. Are the AF ratios you quote above and your comments based directly on MB Kompressor engines - Do they not like running lean? I know that they have sensitive cylinder heads but problems in that regard have generally been explained by them requiring 95 Octane Eurograde fuel. (Narrow distillation curve)
Do you consider your comments accurate in the lean burn era (leaner burn - I'm not talking way off stoichiometric - not 22 to 1 area)
I'm very interested in your experience. Are the AF ratios you quote above and your comments based directly on MB Kompressor engines - Do they not like running lean? I know that they have sensitive cylinder heads but problems in that regard have generally been explained by them requiring 95 Octane Eurograde fuel. (Narrow distillation curve)
Do you consider your comments accurate in the lean burn era (leaner burn - I'm not talking way off stoichiometric - not 22 to 1 area)
Super Member
Joined: May 2008
Posts: 573
Likes: 1
W203
i emailed Renntech last week about this pulley kit, they got back to me this morning. Let me know what you think.
this is part of the email i sent:
re:2005 C230 Kompressor, chassis:W203, engine:m271
I hear there is a 10-15 hp gain between 2-4k, 5hp 5k and up. Are these numbers correct or close to the truth? I also wanted to know if it effects the mpg and if you have numbers on that.
the reply i got:
"I hear there is a 10-15 hp gain between 2-4k, 5hp 5k and up." That seems about right, you might also get a little better mileage at cruising (2 )
Will have more torque at lower rpm.
It works well.
not really a definite answer on anything...
look amanonfire, look what Renntech themselves wrote: "you might also get a little better mileage at cruising"
feel free to email them yourself...
so i guess me asking the question here in the forum, was a good question right?? yeah youre right it was a silly question, since they claim it does and you don't, you must be right and we should just take your word for it.
this is part of the email i sent:
re:2005 C230 Kompressor, chassis:W203, engine:m271
I hear there is a 10-15 hp gain between 2-4k, 5hp 5k and up. Are these numbers correct or close to the truth? I also wanted to know if it effects the mpg and if you have numbers on that.
the reply i got:
"I hear there is a 10-15 hp gain between 2-4k, 5hp 5k and up." That seems about right, you might also get a little better mileage at cruising (2 )
Will have more torque at lower rpm.
It works well.
not really a definite answer on anything...
look amanonfire, look what Renntech themselves wrote: "you might also get a little better mileage at cruising"
feel free to email them yourself...
so i guess me asking the question here in the forum, was a good question right?? yeah youre right it was a silly question, since they claim it does and you don't, you must be right and we should just take your word for it.
Renntech said it "might". I can tell you, it doesn't.
My word > yours.
The only one who's "clowning" is you, and that's "straight up".
Super Member
Joined: May 2008
Posts: 573
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W203
Pay someone to post for you too, then maybe we'll get some informed posts.
MBWorld Fanatic!
Joined: Jan 2008
Posts: 3,597
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From: So Cal... In between LA and OC
2005 CLK320 Vert & 2005 CLK55 AMG
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
You don't have to have a baby to be a competent gynaecologist !!!
MBWorld Fanatic!
Joined: Jan 2008
Posts: 3,597
Likes: 18
From: So Cal... In between LA and OC
2005 CLK320 Vert & 2005 CLK55 AMG
I did but I don't want it now because I was just getting it to do dynos for the form so everyone would quit arguing about it but now people are saying that its not worth the money to dyno and that its hard to find a sophisticated enough dyno so i told big rat and he said i put him in a hard position because i sent the money at like 3am this morning and by 345 i sent him the e-mail saying i didnt want it because everyone started replying about not getting good dynos and not being worth dyno testing it but its a good performance part. but he says i put him in a hard spot because someone wanted to buy it and he said it was sold even though the money is still unclaimed on paypal so i told him if this is his HONEST story then i guess i will take it but really have no use considering my car is slammed now and i dont speed cuz i like my front bumper haha. so if u want it let him now. the item hasn't been shipped and my money is still unclaimed.
I am not calling him a liar i just feel the possibility of me buying and item at 3am and someone else at the same time and him being on within that 45 minute time span to tell the other person that it is sold all while not participating in the forum where we were going back in forth during that 45min and not replying sold in the forum is a little fishy...but if im right i think he is a soldier and i told him i know he has integrity so im assuming hes not lying about this incident
Im talking to him through PM's right now he's a cool dude! So I doubt this is the case..
I am not calling him a liar i just feel the possibility of me buying and item at 3am and someone else at the same time and him being on within that 45 minute time span to tell the other person that it is sold all while not participating in the forum where we were going back in forth during that 45min and not replying sold in the forum is a little fishy...but if im right i think he is a soldier and i told him i know he has integrity so im assuming hes not lying about this incident
Im talking to him through PM's right now he's a cool dude! So I doubt this is the case..
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The M271 is supposed to run at the lean end of stoichiometric - I will see if I can find some graphs. So it runs in the lean area. I'm not talking Toyota/Honda lean burn that run at 22/1 at low RPM coming closer to stoichiometric at high RPM (stratified charge)
Large American engines seem to like more fuel thrown at them to produce power.
Junior Member
Joined: Aug 2008
Posts: 51
Likes: 0
From: Yonkers, NY
2005 C230 Kompressor Sport Sedan
I was close to grabbing the pulley. A set of Kleemann headers came up on the forums from someone local and that took priority. I should be grabbing it this weekend. I very excite! 
