So I decided to start a new thread because the old thread title was not accurate with the issue. This only happens at WOT right around 5000 RPM no matter what gear/speed it’s in or what drive mode is selected, at right around exactly 5000 RPM it loses all boost and almost feels like the brakes are applied. Otherwise it drives perfect and goes through all the gears fine when driving normal. Performance mods: 77mm clutched pulley, 550cc injectors, fabtech intake, colder plugs and 010 pump. Here is a link to the original thread, Which includes VIDS. https://mbworld.org/forums/w211-amg/...ml#post7534325
Also I remove the supercharger belt last night and took it for run WOT and it shifts at exactly 5000 RPM and does not fall on its face with the supercharger belt removed . Another member I’ve been communicating with on the boards here User name 51north is experiencing this exact same issue.
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Do you have an OBDII logger? I would log IAT and Boost. Your MAP sensor might be acting screwy and reading higher than 17psi, which I believe will shut off the supercharger. Same thing will happen if IAT's get over ~200 deg.
I had the rubber intake boots by the radiator on mine collapsing at high boost. Just an idea and it would only take two minutes to test it by removing them. This was with an aftermarket ftp intake with rubber tubes. The stock plastic tubes wouldn't be an issue
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Hmm I will try that and report back. Originally Posted by SICAMG
Can you shift higher with no belt or it only go's to 5,000 ??
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IAT temps are good but the MAP values I will check and report back with my findings.Originally Posted by JoeJErnst
Do you have an OBDII logger? I would log IAT and Boost. Your MAP sensor might be acting screwy and reading higher than 17psi, which I believe will shut off the supercharger. Same thing will happen if IAT's get over ~200 deg.
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Hmm interesting, I have the full 3” FTP intake system with the updated silicone Y-pipe at the throttle body... Which intake system exactly was giving you the problem?Originally Posted by rttadam
I had the rubber intake boots by the radiator on mine collapsing at high boost. Just an idea and it would only take two minutes to test it by removing them. This was with an aftermarket ftp intake with rubber tubes. The stock plastic tubes wouldn't be an issue
I have the ftp intake with silicone Y pipe and have stacked pulleys so there is plenty of boost. At wot and higher rpms the car would literally drop on it's face and it was kind of violent. I could roll on the throttle and the car would be fine. Marcin from what was formerly speeddriven was watching the car on the dyno and noticed the rubber intake tubes collapsing. It was the second ftp intake he had do this . I now have a couple metal tubes inside of the rubber intake tube. The rubber tubes I am referring to go towards the front of the car on the sides of the radiator.
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oh wow that’s crazy... yeah that’s which one I have. I’m going to remove the rubber tubes at the ends and try running it now. Will report back with results thanks.Originally Posted by rttadam
I have the ftp intake with silicone Y pipe and have stacked pulleys so there is plenty of boost. At wot and higher rpms the car would literally drop on it's face and it was kind of violent. I could roll on the throttle and the car would be fine. Marcin from what was formerly speeddriven was watching the car on the dyno and noticed the rubber intake tubes collapsing. It was the second ftp intake he had do this . I now have a couple metal tubes inside of the rubber intake tube. The rubber tubes I am referring to go towards the front of the car on the sides of the radiator.
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I’m the other guy with the exact same problem as Mustang. I also have the FTP intake with the rubber tubes that don’t seem to fit very well and are always not connected to the plastic part under the radiator . When it happens it is definitely very violent. Feels like the brakes are being applied almost. With my car, if you just keep your foot to the floor it will continue with no supercharger until around 6000 or so RPM, shift into the next gear and immediately you’ll have full boost again .
Could someone please tell us at what rpm a normal operating 55 shifts at under WOT?
Mine would do it at wot between 45-6000 rpm. I redline at about 6800 rpm. I was positive it was a fuel pressure issue at first. Nope, the cheapo ftp rubber intake tubes were collapsing. It's easy and zero cost to diagnose it.
PROBLEM SOLVED! It was the ****ty fkn FTP silicone intake tubes to the radiator.... took them off and is working perfect now. Now what is everyone doing to remedy this issue besides take them out completely? The silicone tubes themselves are to short and don’t connect to the radiator scoop openings so even if they were to be reinforced with a “sleeve” is like to connect them.
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Originally Posted by rttadam
I had the rubber intake boots by the radiator on mine collapsing at high boost. Just an idea and it would only take two minutes to test it by removing them. This was with an aftermarket ftp intake with rubber tubes. The stock plastic tubes wouldn't be an issue
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Originally Posted by 51north
I’m the other guy with the exact same problem as Mustang. I also have the FTP intake with the rubber tubes that don’t seem to fit very well and are always not connected to the plastic part under the radiator . When it happens it is definitely very violent. Feels like the brakes are being applied almost. With my car, if you just keep your foot to the floor it will continue with no supercharger until around 6000 or so RPM, shift into the next gear and immediately you’ll have full boost again .
Quote:
Originally Posted by rttadam
Mine would do it at wot between 45-6000 rpm. I redline at about 6800 rpm. I was positive it was a fuel pressure issue at first. Nope, the cheapo ftp rubber intake tubes were collapsing. It's easy and zero cost to diagnose it.
Thank you rttadam and everyone else who tried to solve this issue!!!
Crappy intake parts... Didn't see that coming Glad you got it solved..
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Are you talking about the tubes that run from the air filter boxes to the radiator support for fresh air intake?
Just trying to understand completely.
Just trying to understand completely.
Glad it worked! I have a metal tube inside of the rubber tubes .
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Correct. The stock tubes are a hard plastic. The ftp intake has flimsy ruber tubes which over time get weak. Originally Posted by tlambert
Are you talking about the tubes that run from the air filter boxes to the radiator support for fresh air intake?
Just trying to understand completely.
Just trying to understand completely.
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Wow. So basically it was shutting all the air off going to it at WOT.
Good to know.
Good to know.
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My experience (many years, many types of cars): For BMW/Benz/Porsche (those are the only ones I have experience with), the stock OEM intakes are engineered to provide about the best airflow to engine as possible. Velocity stacks, size of tubes, materials used, filter material..all best combination of performance to protection. I've tried all sorts of high flow intakes, cones, oiled filters (cotton and foam), etc, and in almost every case, I ended up better off with stock/oem setup
This is good news. I suspect mine has the same issue. The car is still at the dealership getting the fuel warranty work done, been 6 weeks now!!!! Thanks for the help!
One more thing, this may help someone else out in the future. In star I did get a code for “supercharger mechanical failure” pretty scary. But it didn’t make any sense. Now it does. Could not get any air.
One more thing, this may help someone else out in the future. In star I did get a code for “supercharger mechanical failure” pretty scary. But it didn’t make any sense. Now it does. Could not get any air.
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+1 stockOriginally Posted by lseguy
My experience (many years, many types of cars): For BMW/Benz/Porsche (those are the only ones I have experience with), the stock OEM intakes are engineered to provide about the best airflow to engine as possible. Velocity stacks, size of tubes, materials used, filter material..all best combination of performance to protection. I've tried all sorts of high flow intakes, cones, oiled filters (cotton and foam), etc, and in almost every case, I ended up better off with stock/oem setup
Yup it’s absolutely ridiculous as far as I’m concerned FTP is a garbage company. A few months back when I was installing this intake system I tried to get a hold of them a couple times via email left a couple voicemails and also via eBay messages and never heard back from them and this was just to purchase a silicone white pipe because of the poorly designed aluminum Y pipe that came with the intake.
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Can you take a couple pics when you get a chance of your set up? My tubes don’t even mate up to the radiator intake scoops they’re too short.Originally Posted by rttadam
Glad it worked! I have a metal tube inside of the rubber tubes .
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Can you take a couple pics when you get a chance of your set up? My tubes don’t even mate up to the radiator intake scoops they’re too short.
Will do. Originally Posted by MUSTANGRIDAH
Can you take a couple pics when you get a chance of your set up? My tubes don’t even mate up to the radiator intake scoops they’re too short.
