pre turbine pressure

[gofer]

I always wondered if that would work. I removed my EGR long ago but I thought about getting a bung welded to my IM at that port and logging with a MAP sensor.

 

[LandSpeed-DSM]

I used both sides of the EGR to measure Drive and Boost a few years ago on a previous DSM.

Just tapped an EGR blockoff and ran rubber hose to the intake side and a coil of copper off the exhaust.

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[BoostedBeaver]

I have also spoken to other members that have taken the readings by drilling and taping a block off plate so it seems to work.

Robert

 

[LandSpeed-DSM]

Yea, I went a different route on this setup. I have a signal buffer at the end of the SS line, which the sensor is threaded into. This is in the hopes it will clean up some of the pulsing.

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It's that polished can over the T-stat housing, it's since been ceramic coated black though. A few things have changed since this shot was taken.

 

[1qkfwd]

See I cant use my egr port since I had it plugged when the head was off. So I drilled and tapped the bolt hole in the front of the turbine housing that is for the factory turbo heat shield. I was told that the reading looked normal. To have it smoother would be way nice.

http://www.dsmtuners.com/forums/dsm...tealing-14b-record-build-7.html#post153279927

 

[BoostedBeaver]

Guessing your erratic readings are coming from each pulse Although I don't really grasp why the pressure would change so much with an exhaust pulse. Anyway... i use the pressure off the longest runner and here is a pic.

Robert

 

[LandSpeed-DSM]

Guessing your erratic readings are coming from each pulse Although I don't really grasp why the pressure would change so much with an exhaust pulse. Anyway... i use the pressure off the longest runner and here is a pic.

Robert

Because each pulse is a wave, with a high pressure zone being pushed by the volume being expelled from the cylinder and low pressure zone following the peak.

That length of coiled tube you have provides a decent amount of buffering.

 

[1qkfwd]

That could be it to. I chatted with Kevin J about maybe the line diameter maybe being to small. I might have to try out a bigger diameter and longer tube.

 

[BoostedBeaver]

I was guessing that the pulses would be so fast that it would not conflict with the reading due to the size of the tube. Either way, your explanation makes sense.

As far as the diameter, I used 1/8 copper tubbing. It was a 6ft piece but i only used about 4ft or so.

Robert

 

[1qkfwd]

I'll have to double check, but I believe mines either 1/16 or an 1/8". The lines short to. It L's over and mounts right on top of the driver side motor mount.

 

[BoostedBeaver]

Uh Oh......

Just checked the part number in the video and it is Auto Meter 3224 which is 6ft of 1/8in copper tubing. I am going to fix the post above so that others do not get confused.

Robert

 

[1qkfwd]

I might try longer tubing.

Only other difference is that I'm using a 0-100 pressure sensor.

Did you make any other changes in link??

 

[BoostedBeaver]

I changed the input on the EGR pin assignment to LinBoost since the sensor was not preprogramed. I then played with the preferences of LinBoost to get the correct reading out of the sensor. Those settings can be found here.

I am not on the tuning computer or I would post a log. Let me know if you need something else.

Robert

 

[1qkfwd]

I'll hook up to the car and see if I can use another sensor setup. I'm on the auto meter pressure and I have zero preference options.

After seeing your screen shot you got my wheels turning. If you can get that smooth of a reading I can to. I'll try and post up what mine looks like tomorrow. It reads like its suppose along with boost, but it does look like it pulses.