How do you install a boost gauge for the M271 Engine
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2016 C63s AMG
How do you install a boost gauge for the M271 Engine
I searched some forums and found some good info but it seems to be for the M111 engine and the SLK32 car. How much differnt is it for the M271 engine? Is it as easy as to tap into a tee vacuum line?
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I believe there was a thread a while back where it was a step by step write up on how to tap into the Vacuum line. He used an Autometer guage that only went up to 15psi and it was mounted on his A-pillar. Try searching it up.
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2016 C63s AMG
Originally Posted by nov0798
I wrote one awhile back, but it was poted on mbklasse.com which appears to be down for some time now.
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A word of caution from someone who has blown a motor by relying on an inexpensive boost gauge. They are not very accurate. They can be as much as 30% away from the true reading. I found that you had to spend around $ 250.00 for an accurate gauge, and pay a test lab about $100. to certify it. That is a little pricey if the gauge is just for show. For show any gauge will be fine, but if you are watching the boost gauge to avoid excessive intake pressure, you really need an accurate gauge.
I had an Audi, and I connected a valve on the dash to the waste gate so I could dial in the power from the c0ckpit. The cheap VDO gauge said I had 4 lbs boost, when I actually had 11. The valves and pistons did not play well together. I had to take a bus home.
I had an Audi, and I connected a valve on the dash to the waste gate so I could dial in the power from the c0ckpit. The cheap VDO gauge said I had 4 lbs boost, when I actually had 11. The valves and pistons did not play well together. I had to take a bus home.
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2016 C63s AMG
Originally Posted by Buellwinkle
Just T into a vacuum line near the throttle body.
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Originally Posted by arell
The boost gauge should be tapped before the oneway valve going to the EGR solenoid which is hidden under the head cover
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remove the silver 'Mercedes-Benz' cover. Remove the two bolts below it.
Now you will see the ignition coil packs and a solenoid valve aside. There is a check valve from the solenoid going to the manifold. This is where you will want to 'T' your gauge into.
Now you will see the ignition coil packs and a solenoid valve aside. There is a check valve from the solenoid going to the manifold. This is where you will want to 'T' your gauge into.
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Originally Posted by arell
remove the silver 'Mercedes-Benz' cover. Remove the two bolts below it.
Now you will see the ignition coil packs and a solenoid valve aside. There is a check valve from the solenoid going to the manifold. This is where you will want to 'T' your gauge into.
Now you will see the ignition coil packs and a solenoid valve aside. There is a check valve from the solenoid going to the manifold. This is where you will want to 'T' your gauge into.
Once I removed the Mercedes-Benz cover the coil packs are right there. I didnt remove 2 bolts below it?
Last edited by pugguy2001; Aug 27, 2006 at 12:09 PM.
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yeap that is the solenoid. Further down (not shown in your pic) you will find a check valve. The further end of the check valve (not the end going to this solenoid) is where you Tee off. BTW, blanking off the EGR bleed from the supercharger gave better low end torque. I tried it on the dyno. This I think is due to the engine getting more boost by not allowing some air to the catalytic converter. I have been trying to tune the ECU with Dastek Unichip piggyback system.
Last edited by arell; Aug 27, 2006 at 01:10 PM.
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Originally Posted by arell
yeap that is the solenoid. Further down (not shown in your pic) you will find a check valve. The further end of the check valve (not the end going to this solenoid) is where you Tee off. BTW, blanking off the EGR bleed from the supercharger gave better low end torque. I tried it on the dyno. This I think is due to the engine getting more boost by not allowing some air to the catalytic converter. I have been trying to tune the ECU with Dastek Unichip piggyback system.
Where is this EGR bleed. When you say blank it you me plug the end.
Thanks for great instructions, so far.
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That gold colored actuator where the two lines after the solenoid leads to, above and slightly in front of the header. On the EGR you can see one ~1/2" hose going to the intercooler piping. I inserted an aluminium rod inside that hose to block it off.
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Originally Posted by arell
That gold colored actuator where the two lines after the solenoid leads to, above and slightly in front of the header. On the EGR you can see one ~1/2" hose going to the intercooler piping. I inserted an aluminium rod inside that hose to block it off.
Ok next I followed the hoses from the egr selonoid to the right and towards the front and I see there is a tee with one coming from the egr seloniod, one going into the supercharger and one i dont know where it goes. Then on the other side of the supercharger there is a tube coming out of the supercharger but then it hooks into a thin white tube?
So far I think I am still with you. Your insrtuctions are great!
