Werks WR3 upgrade thread - Page 5 - Pontiac Solstice Forum
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post #61 of 71 (permalink) Old 04-11-2019, 09:42 AM
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Originally Posted by znaut View Post
The waste gate spring pressure is set to 14.8 psi. I will test that as soon as I get my other problems sorted out. Currently I am having an intermittent overheating problem which I thought was residual air in the system until I realized that my fan was not coming on. New fan controller is on order and should be here Friday.

I previously did a quick run slowly ramping boost to 25 psi and holding (per the boost gauge) but my HP tuners log is still showing the MAP sensor maxing out. The boost gauge and factory readout track each other below 23 psi. Not sure what is going on there. I double checked the the HP tuner constants for the 3 bar sensors and they are correct.
This is absolutely consistent with the pressure exceeding the capability of the sensor. You will either have to reduce your maximum boost or get a sensor with a higher rating.
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Originally Posted by raygun View Post
Someone may jump in here and correct me.

My understanding (verified by some quick Googling, for whatever that's worth) is that the MAP sensors measure (duh) absolute pressure, unlike your boost gauge which is measuring relative pressure.

Since the MAP needs to measure vacuum as well as boost, a low (zeroish) output is going to indicate vacuum, while high outputs indicate boost. With the car on and the engine off, I'd expect to see a MAP value that's around 1/3rd of its max output voltage. That would indicate 1 bar (~14.5psi). 3 bar is 43.5 psi, which would correspond to the max sensor output voltage. (I think this is about +5V, but I haven't checked.)

The practical upshot is that 25psi of boost is about 39.5 absolute pressure, or around 2.8 bar. (And, your boost gauge doesn't have the greatest resolution, so 25 could be, say, 25.5.) I read somewhere that the 3 bar MAP sensors actually only read up to around 2.8 bar. In that case, 25psi is very close to the max value that the sensor can accurately read.

TL;DR: Boost above 25psi may not be detectable by the 3 bar MAP sensors.
Yes, I believe that you are correct.

John
Lexington, KY
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post #62 of 71 (permalink) Old 04-11-2019, 12:18 PM Thread Starter
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Yes, a 3 bar map sensor should be capable of reading just under 30 psi of boost.
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post #63 of 71 (permalink) Old 04-12-2019, 02:13 AM
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When I was tuning my first solstice I used the 3 bar sensors, I knew I was over boosting since Hptuners was reporting 29-30 psi, so the 3 bar sensors are more than capable of reading more than 25 psi. May be your boost gauge is bad or your tune values for the 3 bar sensors are incorrect or your data log tables are not set up correctly

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post #64 of 71 (permalink) Old 04-12-2019, 05:14 PM Thread Starter
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Originally Posted by SSolstice View Post
When I was tuning my first solstice I used the 3 bar sensors, I knew I was over boosting since Hptuners was reporting 29-30 psi, so the 3 bar sensors are more than capable of reading more than 25 psi. May be your boost gauge is bad or your tune values for the 3 bar sensors are incorrect or your data log tables are not set up correctly
I'll play with everything more when I get back to that point and see what I can figure out.

New fan controller should be here tonight and in the meantime I'm trying to get the methanol injection mostly installed.
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post #65 of 71 (permalink) Old 04-12-2019, 05:20 PM Thread Starter
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Added an O2 sensor standoff in the hopes of getting rid of the P0420.
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post #66 of 71 (permalink) Old 04-12-2019, 07:49 PM
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if the 02 extender doesn't help you can buy a "mini cat o2 cel fix" on ebay is basically o2 extender like yours but inside has a cat
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post #67 of 71 (permalink) Old 04-13-2019, 02:09 AM Thread Starter
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if the 02 extender doesn't help you can buy a "mini cat o2 cel fix" on ebay is basically o2 extender like yours but inside has a cat
Thanks.

Got the plumbing installed....
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post #68 of 71 (permalink) Old 04-14-2019, 10:59 AM Thread Starter
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Controller mounted.
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post #69 of 71 (permalink) Old 04-14-2019, 06:48 PM Thread Starter
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New fan controller is in and the fan is working again.

Here's the AC Delco part I used. ACDelco 25845280

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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post #70 of 71 (permalink) Old 04-14-2019, 07:01 PM Thread Starter
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Slowly making progress on the methanol injection as time allows. Here's the final layout for reference. I was surprised at how well everything fit on the Solstice. Still have to find a switched 12v source in the engine fuse box and tap the intake pipe for the nozzle.
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post #71 of 71 (permalink) Old 04-19-2019, 03:26 AM Thread Starter
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Methanol install completed and tested. Now finally back to troubleshooting the wastegate...
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