Mskembo's Evolution Of the W203 Thread
#227
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I have at last count 9 watches but I think i have another one somewhere. I have a few Seiko's, Hamilton x2, ESQ, Tissot X2, UVW, and a gold pocket watch somehow related to tissot.
I Love my self winding seiko, Hamilton and Tissot but i don't where them enough to keep them going
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#229
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OK, tuning is done. There is definitely a good increase in power above 2000rpms, shifting is more responsive and accurate, and the throttle lag has been reduced by a significant amount. One thing that I'm still noticing, the engine seems like it's reluctant until it hits @2000rmps, and then it lurches like it's been let off the chain. Any ideas on what that might be about? My thoughts are; intake, air filters, or dirty throttle body.
Any ideas guys?
Any ideas guys?
#230
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#232
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OK, tuning is done. There is definitely a good increase in power above 2000rpms, shifting is more responsive and accurate, and the throttle lag has been reduced by a significant amount. One thing that I'm still noticing, the engine seems like it's reluctant until it hits @2000rmps, and then it lurches like it's been let off the chain. Any ideas on what that might be about? My thoughts are; intake, air filters, or dirty throttle body.
Any ideas guys?
Any ideas guys?
#233
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I was reading through the docs you posted last year, and I think Cale is right about the problem/solution. The dual runner manifold looks like it's definitely at least part of the culprit. Although I can't say I'm excited about the thought of replacing a magnesium manifold with a composite (ie plastic) manifold...
#234
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2007 C230SS; 2014 ML350 BT
As much as I hate to agree with Matt on this, since it is well known he hates the M272 E25, he is right. Even the M272 E35 has this problem. Torque is almost non-existant until 1800 RPMs. Dyno sheets show it. Just the way these engines are designed. It doesn't help matters with the throttle lag programming that MB uses. Not much you can do about it Mike. Just enjoy the tune. I am just about to pull the trigger on the tune as well
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#235
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2007 C230SS; 2014 ML350 BT
I was reading through the docs you posted last year, and I think Cale is right about the problem/solution. The dual runner manifold looks like it's definitely at least part of the culprit. Although I can't say I'm excited about the thought of replacing a magnesium manifold with a composite (ie plastic) manifold...
#236
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What are your thoughts?
#237
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Since I drive 90% highway, I don't notice it as much as you guys that stoplight race.
I am on the fence on the differential. I am waiting for Phi to give us feedback on it, if he ever installs it
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#238
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I think the elimination of the use of the "Long Runner" would help. Here is the statement in the documentation that made me believe in Cale...
Engine load over 50% from approx. 1750 RPM intake flaps closed (long runner)
• Better cylinder filling and increased torque
• Above 3900 RPM switchover solenoid deactivated via ME intake flaps open (short runner)
• Incoming air follows short runner
• Unlike M112, M272 has two diaphragm actuators
(On page 32 of the document "287 HO M272 (FAH) 08-05-04.pdf")
Not saying that this is a surefire cure, and I'm not willing to be a guinea pig, but if this does make the difference for Cale and Phi, then I'd be stupid not to pay attention. I wonder if there is a way to just "force" the intake flap into the short position permanently? IMHO, that would be a preferable way to go; less expensive, and hopefully more easily reversible.
Engine load over 50% from approx. 1750 RPM intake flaps closed (long runner)
• Better cylinder filling and increased torque
• Above 3900 RPM switchover solenoid deactivated via ME intake flaps open (short runner)
• Incoming air follows short runner
• Unlike M112, M272 has two diaphragm actuators
(On page 32 of the document "287 HO M272 (FAH) 08-05-04.pdf")
Not saying that this is a surefire cure, and I'm not willing to be a guinea pig, but if this does make the difference for Cale and Phi, then I'd be stupid not to pay attention. I wonder if there is a way to just "force" the intake flap into the short position permanently? IMHO, that would be a preferable way to go; less expensive, and hopefully more easily reversible.
#239
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On a side note, since my tune yesterday I just noticed that my gas mileage got a nice bump! (when my foot isn't trying to make a dent in the floor board) On my way out to East Texas I'm getting 30.5-31mpg, and even with the city driving at the beginning, and the wait in the Starbucks drive through, I'm getting 28.3average... Not too shabby!
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#240
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I definitely think the manifold will improve the upper end of the RPM range, but I am fairly confident, it will hurt the low end. We can't afford to do any mod that hurts the low end. The M272 was designed to rev, as Glyn and I have tried hammer in peoples heads. Look at all the dyno sheets, and the HP curve is STEEP on these engines. I honestly don't think there is anything that can improve the low end other than forced induction. The only thing that may help, is to figure out how to reprogram the throttle ramp. Not sure if that is even possible.
Since I drive 90% highway, I don't notice it as much as you guys that stoplight race.
I am on the fence on the differential. I am waiting for Phi to give us feedback on it, if he ever installs it![Stick Out Tongue](https://mbworld.org/forums/images/smilies/tongue.gif)
Since I drive 90% highway, I don't notice it as much as you guys that stoplight race.
I am on the fence on the differential. I am waiting for Phi to give us feedback on it, if he ever installs it
![Stick Out Tongue](https://mbworld.org/forums/images/smilies/tongue.gif)
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
Ya Phi, hurry up and install the rear diff
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
#241
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Keep in mind with the manifold you have to go with the TB as well. The TB is 800 bucks and hard to find. All the AMG guys upgrade to them so in a sense it's like the Xbox 360 during holiday season.
#242
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#243
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06 C230 SS 6spd
Ok ok ill see what I can do Sunday or Monday. Ill finally have some downtime to work on it. Plus being able to see it on a lift really helped me out on seeing how the front mounting bolt is located and how to access it. Cross your fingers it all goes smoothly. Says it shouldn't be more than 2 hrs in the manual
#244
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If I did Alex's calculation correct he gained some serious power. So with all those mods I'm guessing you might be around 250hp.
Let's be a little realistic here. Calculation time.
Those headers are exact copy as kleeman and they claim up to 20hp.
Minimum Alex got with his tune is 12hp (he might have got more but 12 to be on the safe side)
Cale claims he easily felt he gained 30hp with his mod and it's untuned. So to be safe lets say 20hp (no proof yet).
So that's a 52hp gain with 2k + cost of tune
If this is all true that's some serious power.
#245
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Yeah, that's a >25% increase. I'll throw $2k down for that much of an increase. I'm going to order the headers in May, and then I've got to decide what I'm going to do for a center pipe, and muffler. We'll see where that gets me, but it's still not going to address the lag issue. That's the problem with this whole power bug... I should have just bought a C55 and dealt with the consequences (insurance, gas, wife), but I have the C230, so here we go!
#248
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Working out in East Texas I've cleaned my car more in three months than I do in a year in Dallas.
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