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How do I eliminate the 18psi limp mode with my 180/77

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Old 09-21-2015, 01:30 AM
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How do I eliminate the 18psi limp mode with my 180/77

My car will hit limp mode as soon as I hit 18psi of boost and then I have to turn the car off and restart it otherwise the car will just bog down anything over 3k rpm. I have all cooling and exhaust mods necessary. Will a tune disable or raise the limp mode to at least 20psi? What are you guys doing whoever has this same setup? Or do I switch back to a 180/83 setup?
Old 09-21-2015, 02:00 AM
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https://splitsec.com/

Welcome to the next level of frustrations. Map Clamp it and call it a day......
Old 09-21-2015, 02:20 AM
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what do I buy from there? What does that do?
Old 09-21-2015, 02:52 AM
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It basically remaps your input at the sensor.

In "lay" terms:
Say a wealthy investor tells his "nanny" that he's measured at nine inches. This is all well and good, per se.

---Except, he's measuring from the exhaust, to the tip, so-to-speak. At the end of the night, the "nanny" sees six inches, even though he's really carrying the "extra three".

This is how devices such as these can help this situation, if you follow the euphemism.

Be advised, you will have to re-scale your ECU, to make everything play nice (since your ECU is really only programmed to see X amount of pressure).


Hope that helps.
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Old 09-21-2015, 08:27 AM
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Originally Posted by Rob CL
It basically remaps your input at the sensor.

In "lay" terms:
Say a wealthy investor tells his "nanny" that he's measured at nine inches. This is all well and good, per se.

---Except, he's measuring from the exhaust, to the tip, so-to-speak. At the end of the night, the "nanny" sees six inches, even though he's really carrying the "extra three".

This is how devices such as these can help this situation, if you follow the euphemism.

Be advised, you will have to re-scale your ECU, to make everything play nice (since your ECU is really only programmed to see X amount of pressure).


Hope that helps.
That explanation while is beautifully accurate.
Old 09-21-2015, 09:20 AM
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Originally Posted by Rob CL
It basically remaps your input at the sensor.

In "lay" terms:
Say a wealthy investor tells his "nanny" that he's measured at nine inches. This is all well and good, per se.

---Except, he's measuring from the exhaust, to the tip, so-to-speak. At the end of the night, the "nanny" sees six inches, even though he's really carrying the "extra three".

This is how devices such as these can help this situation, if you follow the euphemism.

Be advised, you will have to re-scale your ECU, to make everything play nice (since your ECU is really only programmed to see X amount of pressure).


Hope that helps.


Certainly are pushing the threshold of the superchargers efficiency.

Last edited by jmb614; 09-21-2015 at 09:25 AM.
Old 09-21-2015, 10:20 AM
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Originally Posted by vikingdiesel
what do I buy from there? What does that do?
This......


https://splitsec.com/product/vc3-100-voltage-clamp/


You splice into to the map sensor cable and set the voltage to @4.5v......ish. ECU goes ape sh*t once signal hits 5v with high boost. A dyno tune is always good to have done after install so you can get the afr's in check.
Old 02-25-2017, 04:29 PM
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Originally Posted by EREBUS
https://splitsec.com/

Welcome to the next level of frustrations. Map Clamp it and call it a day......
Any advise on where to place this ?

just got the map clamp today and want to fit it next week

Going 77sc and 185mm cp
Old 02-25-2017, 06:14 PM
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dont mean to hijack thread -- how does weistec get that kind of boost along with the fixed sc pulley and not have any issues ?
Old 02-26-2017, 10:46 AM
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They know how to tune the file deeper.
Euro tuners can alter the files better and deeper.
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Old 02-26-2017, 06:25 PM
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Jerry figured out to get over 19psi here

https://mbworld.org/forums/w211-amg/...tml?styleid=19
Old 02-27-2017, 06:21 AM
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Originally Posted by Hulk
Jerry figured out to get over 19psi here

https://mbworld.org/forums/w211-amg/...tml?styleid=19

thats a Weistec blower and fixed pulley with a EC tune --i wonder why the fixed pulley with OEM blower has issues like the infamous hiccup
its an enigma
Old 02-27-2017, 07:17 AM
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Fixed pulley or not makes no diff
He went over 18psi so jerry can do it
Old 02-27-2017, 01:32 PM
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Originally Posted by Shirvaan
Any advise on where to place this ?

just got the map clamp today and want to fit it next week

Going 77sc and 185mm cp
All you need to do is to splice the wires going to the map sensor. I made the wire long enough to place the Map Clamp in this location....

This video explains and helps with the install!

Old 02-27-2017, 01:36 PM
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Originally Posted by Roverron
They know how to tune the file deeper.
Euro tuners can alter the files better and deeper.
Well, this turned awkward quickly. lol
Old 02-27-2017, 02:53 PM
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Thanks buddy

Your setup looks sick
Originally Posted by EREBUS



All you need to do is to splice the wires going to the map sensor. I made the wire long enough to place the Map Clamp in this location....

This video explains and helps with the install!

https://www.youtube.com/watch?v=coZVHLkzM7I
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Old 02-27-2017, 10:54 PM
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^^^^ that's a whole lotta business going on in there!
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Old 03-02-2017, 08:34 PM
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I make 511whp at 14psi. Curious what you're making at 20..
Old 03-04-2017, 10:01 AM
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Originally Posted by vikingdiesel
My car will hit limp mode as soon as I hit 18psi of boost and then I have to turn the car off and restart it otherwise the car will just bog down anything over 3k rpm. I have all cooling and exhaust mods necessary. Will a tune disable or raise the limp mode to at least 20psi? What are you guys doing whoever has this same setup? Or do I switch back to a 180/83 setup?
after driving normally for 200km I had the same problem. It is not taking more than 3000 rpm and more than 140 km/h.
I restarted the car and was back in normal. No check lights on the dash.
any idea what to do?
Old 03-05-2017, 11:36 PM
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You are not a sponsor here and no one knows you. You will get banned
Old 03-06-2017, 06:05 AM
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Originally Posted by Hulk
You are not a sponsor here and no one knows you. You will get banned
Hope not. He seems to know his way around in the computers. That is a rare and valuable thing.
Old 04-03-2017, 01:27 PM
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So i I fitted the crank pulley without the map clamp and it drives fine

onky issue now is the charger is shutting off at 230kmh

is this due to the clamp nt fitted ?

Originally Posted by EREBUS



All you need to do is to splice the wires going to the map sensor. I made the wire long enough to place the Map Clamp in this location....

This video explains and helps with the install!

https://www.youtube.com/watch?v=coZVHLkzM7I
Old 04-03-2017, 09:01 PM
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Originally Posted by Shirvaan
So i I fitted the crank pulley without the map clamp and it drives fine

onky issue now is the charger is shutting off at 230kmh

is this due to the clamp nt fitted ?
Not sure of your specific build, but it sounds like you're overheating the charge air man. Been watching the IATs? Coolant pump in good order?
Old 04-04-2017, 08:23 AM
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Originally Posted by StarvingArtist
Hope not. He seems to know his way around in the computers. That is a rare and valuable thing.
This doesn't look like the thread I posted this in! I guess he did get banned.
Old 04-05-2017, 01:09 AM
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This was my first data log in a recent mile event a few weeks ago. I built an entirely new intercooler system and was running it on the CLS for data. My heads were lifting and blowing coolant out the reservoir during these data logs. These figures were taken with the Map sensor (clamped) after all three water to air intercoolers. I should have over 20 psi once I remove the factory intercooler (working on intercooler revision #4)

Map clamp only. No fairy dust or bullsh*t tuning claims.


Yeah, the IAT's? 89 degrees at the airstrip. Engine Bay tank was iced down (2.25 gallons) and using 49 meth/ 51 water. Wicked burn out jumped my IAT's a tad and sitting in staging didn't help. Regardless, not a system out there could do that. That's over a mile @ WOT. Just say'in?







Last edited by EREBUS; 04-05-2017 at 01:48 AM.


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