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> MegaSquirt again......, 1971 with 73 1.7 and Side Shift
falconfp2001
post Mar 16 2012, 01:44 AM
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I just purchased and received almost all my Megasquirt parts and I'm starting to plan for the build.

I was going to go with the following setup

1. 1.7L Stock FI with 2.0 Plenum and throttle body

2. 85 BMW Bosch TPS for an automatic transmission

2. Wells AC320 IAC valve

3. GM open element IAT

4. CHT Ring probe Changed to using the Stock CHT drilled out and using a thermistor held in place by epoxy. I drilled it out with a 3/16 bit

5. Innovate MTX wide-band O2 sensor and gauge combo

6. Megasquirt 2 PCB 3.57

7. Ford EDIS 4 with coil pack

8. 36-1 crank wheel with sensor
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falconfp2001
post Mar 16 2012, 01:49 AM
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My first Task was to source the Plenum and the IAC valve. I purchased a very nice Plenum and then purchased an IAC from eBay. I had to then figure the best place to mount the IAC. DIYAutotune sells a billet mount for around 65.00 so I figured, why not make my own.

I then started to fabricate a mounting plate so I can use the same AAR inlet and mount the IAC where the cold start valve would go.


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falconfp2001
post Mar 16 2012, 01:52 AM
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The Teflon inlet piece needed to be drilled out to a little over 3/4 of an inch for the IAC to fit but the pintle was too small to seal on the plenum.


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falconfp2001
post Mar 16 2012, 01:53 AM
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So I drilled out the plenum just a tad, cut off one of the vacuum hose Metal fittings at the bead,


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falconfp2001
post Mar 16 2012, 01:55 AM
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and bang. It fits like a washer. Now I beveled the ID of the Teflon fitting so it will have a tight seal on the washer.


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falconfp2001
post Mar 16 2012, 01:57 AM
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It seals up fine.


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falconfp2001
post Mar 16 2012, 01:58 AM
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All I have to do now is fabricate a mounting plate, source some inset bolts to replace the stock bolts, use some self tapping bolts to mount the IAC to the plate and done.


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falconfp2001
post Mar 16 2012, 01:59 AM
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Here is the mounting plate I made. I replaced the bolts with inset hex bolts.


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falconfp2001
post Mar 16 2012, 02:01 AM
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Here is the plate installed with IAC mounted as well.


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falconfp2001
post Mar 16 2012, 02:07 AM
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Here is a shot with the TPS and pigtail installed. The 85 BMW automatics had a potentiometer TPS that would control the transmission. So, it basically the same as the 914 TPS in operation for the BMW. It contains three shielded wires that are the 5v reference, Return signal and the ground. I'm going to use two shielded for the ref and return and then a common ground for all sensors back to MS. With the exception of the O2 sensor which will be grounded under the dash.


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falconfp2001
post Mar 16 2012, 02:16 AM
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Phase two

Installing the O2 sensor and gauge. I purchase the Innovate MTX-L. It is the sensor, cabling and gauge with integrated controller. The kit comes with a mild steel bung and about 12' of cabling. I figure if I can't get it from the back of the car to the dash with 12' then somethings wrong.

The system is totally separate so I'll install it first. What you don't see is the bung that was welded to my muffler. Just have to figure the best place to put the gauge and people suggest the ash tray and I'm tending to agree. Wish I could some how put it just under the dash as I'm not going to stair at it all the time. Just nice to have a peek. Oh well, I'll see what works.


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Bob L.
post Mar 16 2012, 08:26 AM
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76-914
post Mar 16 2012, 08:37 AM
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kevin311
post Mar 16 2012, 10:01 AM
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Awesome! I just finished a MS2 v3.57fuel only install on my '71 1.7. I actually just took it for the first spin yesterday and starting to really get tuning today.
I really like your IAC solution. Right now I have it bypassed, so it idles a little low until its warm. Im also going to have to remember about those BMW TPS, I used one out of a Cadillac Catera and fabbed an adapter plate.
Again awesome work and keep us updated!
Kevin
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914_teener
post Mar 16 2012, 12:02 PM
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Very cool.

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JamesM
post Mar 16 2012, 12:43 PM
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QUOTE(kevin311 @ Mar 16 2012, 08:01 AM) *

Awesome! I just finished a MS2 v3.57fuel only install on my '71 1.7. I actually just took it for the first spin yesterday and starting to really get tuning today.
I really like your IAC solution. Right now I have it bypassed, so it idles a little low until its warm. Im also going to have to remember about those BMW TPS, I used one out of a Cadillac Catera and fabbed an adapter plate.
Again awesome work and keep us updated!
Kevin


+1 on the IAC solution. I just use the stock AAR on my setups but this looks like a real clean way to go and as a bonus plugs the 5th injector hole.

That TPS is a nice find as well, I will have to check that our as i have been building adaptor plates out of stock TPSs
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falconfp2001
post Mar 16 2012, 01:01 PM
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QUOTE(JamesM @ Mar 16 2012, 11:43 AM) *

QUOTE(kevin311 @ Mar 16 2012, 08:01 AM) *

Awesome! I just finished a MS2 v3.57fuel only install on my '71 1.7. I actually just took it for the first spin yesterday and starting to really get tuning today.
I really like your IAC solution. Right now I have it bypassed, so it idles a little low until its warm. Im also going to have to remember about those BMW TPS, I used one out of a Cadillac Catera and fabbed an adapter plate.
Again awesome work and keep us updated!
Kevin


+1 on the IAC solution. I just use the stock AAR on my setups but this looks like a real clean way to go and as a bonus plugs the 5th injector hole.

That TPS is a nice find as well, I will have to check that our as i have been building adaptor plates out of stock TPSs


Thanks, the IAC place i created is not completely vacuum sealed but i think it is enough to control idle. I checked by just blowing air and it holds but will leak. I several of the Teflon brackets so I'm going to experiment to get a better seal but I think it's fine.

Wow didn't even think of using the old TPS as an adapter plate. Do you have a pic?
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JamesM
post Mar 16 2012, 02:35 PM
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QUOTE(falconfp2001 @ Mar 16 2012, 11:01 AM) *

QUOTE(JamesM @ Mar 16 2012, 11:43 AM) *

QUOTE(kevin311 @ Mar 16 2012, 08:01 AM) *

Awesome! I just finished a MS2 v3.57fuel only install on my '71 1.7. I actually just took it for the first spin yesterday and starting to really get tuning today.
I really like your IAC solution. Right now I have it bypassed, so it idles a little low until its warm. Im also going to have to remember about those BMW TPS, I used one out of a Cadillac Catera and fabbed an adapter plate.
Again awesome work and keep us updated!
Kevin


+1 on the IAC solution. I just use the stock AAR on my setups but this looks like a real clean way to go and as a bonus plugs the 5th injector hole.

That TPS is a nice find as well, I will have to check that our as i have been building adaptor plates out of stock TPSs


Thanks, the IAC place i created is not completely vacuum sealed but i think it is enough to control idle. I checked by just blowing air and it holds but will leak. I several of the Teflon brackets so I'm going to experiment to get a better seal but I think it's fine.

Wow didn't even think of using the old TPS as an adapter plate. Do you have a pic?



I have some somewhere but i need to go digging for it. A few guys have done it this way. My primary motivation was so i could use the connection to the stock wiring harness.

BTW when you get to that point, Tunerstudio is worth the money.
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falconfp2001
post Mar 16 2012, 03:21 PM
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QUOTE(JamesM @ Mar 16 2012, 01:35 PM) *

QUOTE(falconfp2001 @ Mar 16 2012, 11:01 AM) *

QUOTE(JamesM @ Mar 16 2012, 11:43 AM) *

QUOTE(kevin311 @ Mar 16 2012, 08:01 AM) *

Awesome! I just finished a MS2 v3.57fuel only install on my '71 1.7. I actually just took it for the first spin yesterday and starting to really get tuning today.
I really like your IAC solution. Right now I have it bypassed, so it idles a little low until its warm. Im also going to have to remember about those BMW TPS, I used one out of a Cadillac Catera and fabbed an adapter plate.
Again awesome work and keep us updated!
Kevin


+1 on the IAC solution. I just use the stock AAR on my setups but this looks like a real clean way to go and as a bonus plugs the 5th injector hole.

That TPS is a nice find as well, I will have to check that our as i have been building adaptor plates out of stock TPSs


Thanks, the IAC place i created is not completely vacuum sealed but i think it is enough to control idle. I checked by just blowing air and it holds but will leak. I several of the Teflon brackets so I'm going to experiment to get a better seal but I think it's fine.

Wow didn't even think of using the old TPS as an adapter plate. Do you have a pic?



I have some somewhere but i need to go digging for it. A few guys have done it this way. My primary motivation was so i could use the connection to the stock wiring harness.

BTW when you get to that point, Tunerstudio is worth the money.


I thought DIY has it as a complete free donwload package?
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rwilner
post Mar 16 2012, 05:23 PM
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QUOTE

I thought DIY has it as a complete free donwload package?

basic ts is free. There is an upgrade for 40 or something that gives you enhanced dashboards, better data logging and, most importantly, unlocks auto tune capability. I think it's worth it but it's definitely not required.
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