[s-cars] MTM 1+ chips and GM map sensor

Tue Aug 17 14:37:18 PDT 2010

George,

If you are going to use the GM sensor because you have it, the classic  
way is to identify the pinout
for the transducer and attach pigtails inside and outside on the  
connector pins to input the signal
from the exterior sensor.

I would expect that either Ben or Steve Eiche are eminently qualified  
to install the sensor hook-up
if you are not a DIY guy in this area.  They could also test the  
resulting modification.

I suspect a lot of listers are interested in the new transducer.

Tom

> -----Original Message-----
> Date: Mon, 16 Aug 2010 23:10:53 -0400
> From: "Ben Swann" <benswann at verizon.net>
> Subject: [s-cars] MTM 1+ chips and GM map sensor
> To: <georgeverbryck at yahoo.com>
> Cc: s-car-list at audifans.com
> Message-ID: <EEDF168CE0C94A33837350AEC74665E3 at swansong>
> Content-Type: text/plain;	charset="iso-8859-1"
>
>
> Voltage output with respect to manifold pressure is nearly identical  
> on a few of these.
> The issue may be more with packaging and fitment inside the ECU -  
> you should be able to
> make it work.  Also there are a few different versions that have a  
> different Vo skew.
> You want one that measures linearly from  - 13.7  to 30.0 PSIg .
>
> You will need to verify which leads on the GM sensor correspond to  
> the pins of the
> pressure transducer to solder on the circuit board in the ECU.  That  
> I don't know off
> hand, but it is likely the leads do not match up with the pin order  
> of the BOSCH.  Also,
> the stranded wire leads are not a good way to solder on a printed  
> circuit board.
>
> I'll have a pin for pin direct substitute available for original  
> Bosch 3 bar P.T. soon
> for around $100.
>
> Ben.
>
> [Date: Sun, 15 Aug 2010 16:58:49 -0700 (PDT)
> From: George Verbryck <georgeverbryck at yahoo.com>
> Subject: [s-cars] MTM 1+ chips and GM map sensor
> To: s-car-list at audifans.com
> Message-ID: <893925.99534.qm at web56403.mail.re3.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> I recently purchased to some MTM 1+ chips to install and was  
> figuring on using the
> generic GM 3 bar map sensor obtained from ebay. I have been told it  
> should work OK ,
> just wondering if anyone else has used one and how it worked. I  
> would also like to know
> the three wire connection wiring for the GM sensor, any BTDT. I have  
> some Lehman stage 3
> chips now which I like but always trying something different .
> Regards, George]
>
> Date: Tue, 17 Aug 2010 11:52:54 -0400
> From: "Ben Swann" <benswann at verizon.net>
> Subject: Re: [s-cars] MTM 1+ chips and GM map sensor
> To: "'George Verbryck'" <georgeverbryck at yahoo.com>
> Cc: 'Ben Swann' <benswann at verizon.net>, s-car-list at audifans.com
> Message-ID: <726AD6D7EA914A03B17C1AE051BB4946 at swansong>
> Content-Type: text/plain;	charset="iso-8859-1"
>
> I'll point you to another solution that may be less $ and  guranteed  
> to work.
>
> Since I don't have my (GTQuattro) version that will be made  
> specifically for the
> Motronic ECU, I am suggesting another that is made for the purpose  
> of modifying board
> mounted pressure transducers and I have used these - they work.
>
> These are the RS AutoSport # Bar Upgrade kit for Megasquirt:
> http://www.rs-autosport.net/catalog/product_info.php?cPath=10
> <http://www.rs-autosport.net/catalog/product_info.php?cPath=10&products_id=213 
> >
> &products_id=213
> it works and you wont beat the price.  The only downside is it does  
> not fit that well
> inside the ECU, but is sure is much better than the GM MAP.
>
> There is more info on 3 bar solutions including the GM one here:
> http://www.megamanual.com/v22manual/3bar.htm
> <http://www.megamanual.com/v22manual/3bar.htm>   This link contains  
> info for the GM PT
> and others.
>
> I have the components for a correct fit and insert unit on my desk.   
> I should have had
> this done already,  I can probably market these in the $50 price  
> range.  If you want to
> try one, I could probably have one ready within 2 weeks.
>
> Cheers!
>
> Ben
>
>  _____
>
> From: George Verbryck [mailto:georgeverbryck at yahoo.com]
> Sent: Tuesday, August 17, 2010 1:49 AM
> To: Ben Swann
> Subject: Re: MTM 1+ chips and GM map sensor
>
>
> Ben,
>         thanks for the information , I think I am going to try a GM  
> sensor I already
> got some good info from another lister. I was already planning on  
> having the new sensor
> on the outside of the ECU and install standoffs in the ecu to attach  
> the wires. If you
> get something soon let me know. The bosch sensors are just crazy in  
> price by comparison.
>
> Regards, George
>
> --- On Mon, 8/16/10, Ben Swann <benswann at verizon.net> wrote:
>
>
>
>
> From: Ben Swann <benswann at verizon.net>
> Subject: MTM 1+ chips and GM map sensor
> To: georgeverbryck at yahoo.com
> Cc: s-car-list at audifans.com
> Date: Monday, August 16, 2010, 8:10 PM
>
>
>
>
> Voltage output with respect to manifold pressure is nearly identical  
> on a few of these.
> The issue may be more with packaging and fitment inside the ECU -  
> you should be able to
> make it work.  Also there are a few different versions that have a  
> different Vo skew.
> You want one that measures linearly from  - 13.7  to 30.0 PSIg .
>
> You will need to verify which leads on the GM sensor correspond to  
> the pins of the
> pressure transducer to solder on the circuit board in the ECU.  That  
> I don't know off
> hand, but it is likely the leads do not match up with the pin order  
> of the BOSCH.  Also,
> the stranded wire leads are not a good way to solder on a printed  
> circuit board.
>
> I'll have a pin for pin direct substitute available for original  
> Bosch 3 bar P.T. soon
> for around $100.
>
> Ben.
>
> [Date: Sun, 15 Aug 2010 16:58:49 -0700 (PDT)
> From: George Verbryck <georgeverbryck at yahoo.com>
> Subject: [s-cars] MTM 1+ chips and GM map sensor
> To: s-car-list at audifans.com
> Message-ID: <893925.99534.qm at web56403.mail.re3.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> I recently purchased to some MTM 1+ chips to install and was  
> figuring on using the
> generic GM 3 bar map sensor obtained from ebay. I have been told it  
> should work OK ,
> just wondering if anyone else has used one and how it worked. I  
> would also like to know
> the three wire connection wiring for the GM sensor, any BTDT. I have  
> some Lehman stage 3
> chips now which I like but always trying something different .
>
> Regards, George]
>
>
>
>