MPS Tuning Analysis Options

[Robarabian]

I hate to revive this, but....I am now diving into this.


There is a conflicting post in this thread... which way to turn the inner/outer adjusters to richen versus lean...

[emerygt350]

I hate to revive this, but....I am now diving into this.


There is a conflicting post in this thread... which way to turn the inner/outer adjusters to richen versus lean...

There is a table on this site. And lots of good info. You really need an afr to tune it by hand though. And the kit from tangerine. I tried bench tuning mine, then on the dyno, but nothing beat my own afr and just driving. Oh a vacuum gauge is a good idea too. You run it lean and you could really hurt your motor.

https://members.rennlist.com/pbanders/DJetParts.htm

[mgphoto]

This is what I use.

Inside screw only cw part load lean, full load lean
Inside screw only ccw part load rich, full load rich

Inside and outside screws together cw part load no effect, full load lean
Inside and outside screws together ccw part load no effect, full load rich

Full load stop screw cw part load no effect, full load lean
Full load stop screw ccw part load no effect, full load rich

[Robarabian]

@mgphoto thank you I will use those as I progress.

NOTE: Tangerine'w rebuild kit is excellent and has everything you need. The instructions are excellent, with photos. The tool kit will hopefully make this a bit less stressful.

I could not get the stop screw out of the housing even after getting the epoxy scraped and melted out. They are a bugger! I emailed Chris and he said I could send it to him and he would get it done. It is on the way to him, and I am putting this here because our vendors and community make having these cars possible. So thank you to everyone and to Chris at Tangerine for the product and willingness to help.

I ended up finding a "Meterman" like in Pbanders article for a reasonable price so I can at least have a starting point setting it up electronically before running it on the car.

[emerygt350]

@mgphoto thank you I will use those as I progress.

NOTE: Tangerine'w rebuild kit is excellent and has everything you need. The instructions are excellent, with photos. The tool kit will hopefully make this a bit less stressful.

I could not get the stop screw out of the housing even after getting the epoxy scraped and melted out. They are a bugger! I emailed Chris and he said I could send it to him and he would get it done. It is on the way to him, and I am putting this here because our vendors and community make having these cars possible. So thank you to everyone and to Chris at Tangerine for the product and willingness to help.

I ended up finding a "Meterman" like in Pbanders article for a reasonable price so I can at least have a starting point setting it up electronically before running it on the car.

I have found that the interrelatedness of the adjustments results in a cascade of effects. Simply moving one screw does not result in a single linear outcome. The position of each can effect the performance of others. The stop screw (the one you couldn't get out), is really the only thing you can set and forget. Follow Chris's instructions for that closely (and do it on the bench). After that I suggest the afr and drive tuning. You can jump out and insert Chris's tool in the MPS and change it quickly. I found that after 3 or 4 runs on the interstate and up and down some hills I had a second sense for how it would react changing the inner and outer screws. It really isn't as straight forward as the table implies, although it is a great start. Really getting a good mental image of how the thing works internally helps as well. And that vacuum gauge really is a good addition (they are super cheap and don't require wiring, just t off your decel valve or any other manifold port). You need to know what vacuum you are pulling to do it right. just put it on the seat next to you, nothing permanent needed.

[Eric_Shea]

Sorry! IT’S A JOKE!!! (IMG:style_emoticons/default/biggrin.gif)

[emerygt350]

That's awesome.

[rjames]

(IMG:style_emoticons/default/av-943.gif)

The guy that spent his life trying to dial it in properly is probably buried next to it.

[gonzo54]

I'm not sure I understand half of the technical detail involed in MPS tuning and I don't have the equipment, so I'm looking for someone in the Southern California area that can provide this service. I know that I will have to add a Bung to my Bursch exhaust (cylinder #3?) Any advice or reource would be appreciated.

Thanks-Rick

[Quinn Moore]

I'm not sure I understand half of the technical detail involed in MPS tuning and I don't have the equipment, so I'm looking for someone in the Southern California area that can provide this service. I know that I will have to add a Bung to my Bursch exhaust (cylinder #3?) Any advice or reource would be appreciated.

Thanks-Rick

I've sent (2) to FIC. for testing and rebuild.
(no affiliation).

https://fuelinjectioncorp.com/

QM

[gonzo54]

I'm not sure I understand half of the technical detail involed in MPS tuning and I don't have the equipment, so I'm looking for someone in the Southern California area that can provide this service. I know that I will have to add a Bung to my Bursch exhaust (cylinder #3?) Any advice or reource would be appreciated.

Thanks-Rick

I've sent (2) to FIC. for testing and rebuild.
(no affiliation).

https://fuelinjectioncorp.com/

QM

I would like to take my car to someone that has the equipment and knowledge to fine tune the MPS

[emerygt350]

There are probably about three people that fit that description. It really isn't bad but I can understand not wanting to try. Somebody in CA must have the know how, or is it just us New Englanders that obsess over MPS?

[gonzo54]

There are probably about three people that fit that description. It really isn't bad but I can understand not wanting to try. Somebody in CA must have the know how, or is it just us New Englanders that obsess over MPS?

That would be a long drive but what an adventure in a 914!

[windforfun]

Sorry! IT’S A JOKE!!! (IMG:style_emoticons/default/biggrin.gif)

(IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif)

Wasn't the 914 the first production car to be sold in the USA with fuel injection?

[emerygt350]

There are probably about three people that fit that description. It really isn't bad but I can understand not wanting to try. Somebody in CA must have the know how, or is it just us New Englanders that obsess over MPS?

That would be a long drive but what an adventure in a 914!

I wouldn't chance it with out a tuned mps though...

I would love to drive cross country in mine. Wish I had the time.

[gonzo54]

I'm not sure I understand half of the technical detail involed in MPS tuning and I don't have the equipment, so I'm looking for someone in the Southern California area that can provide this service. I know that I will have to add a Bung to my Bursch exhaust (cylinder #3?) Any advice or reource would be appreciated.

Thanks-Rick

Robert @Robarabian do you have any MPS tuning contacts in So Cal?

Thanks-Rick

[JeffBowlsby]

Sorry! IT’S A JOKE!!! (IMG:style_emoticons/default/biggrin.gif)

(IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif)

Wasn't the 914 the first production car to be sold in the USA with fuel injection?

No. Mechancial FI goes back to some 50's US production cars. Bosch Electronic FI...68 VWs I recall, but several makers came out with it about the same time.

[Robarabian]

Hi Rick. As I said in my post, I obtained the same test meter that PB Anders referred to. I have mine rebuilt now and bench adjusted. I got side tracked on my 914-6 conversion car and this car has been sitting. But it is installed. My goal is to get it started and then do some adjusting. I purchased an AFR meter that I can install, and I also have access to a CO meter for adjustment. I am learning it as well since there is nobody reliable around me that does it. I am happy to help you bench set yours up. If I am successful with the AFR install and tuning, Im happy to share the knowledge. It just may take a little time, I have to get the 6 on the road... hopefully in the next 2 weeks ( I have to travel for work next week).

We're not too far from each other so if you are totally stuck, hit me up. You have to be able to get to the adjustment screw which is that hardest part, removing that darn epoxy. You cant adjust without doing that.

I rebuilt mine, it holds vacuum, and all the electrics check out so far.

I'm not sure I understand half of the technical detail involed in MPS tuning and I don't have the equipment, so I'm looking for someone in the Southern California area that can provide this service. I know that I will have to add a Bung to my Bursch exhaust (cylinder #3?) Any advice or reource would be appreciated.

Thanks-Rick

Robert @Robarabian do you have any MPS tuning contacts in So Cal?

Thanks-Rick

[gonzo54]

Hi Rick. As I said in my post, I obtained the same test meter that PB Anders referred to. I have mine rebuilt now and bench adjusted. I got side tracked on my 914-6 conversion car and this car has been sitting. But it is installed. My goal is to get it started and then do some adjusting. I purchased an AFR meter that I can install, and I also have access to a CO meter for adjustment. I am learning it as well since there is nobody reliable around me that does it. I am happy to help you bench set yours up. If I am successful with the AFR install and tuning, Im happy to share the knowledge. It just may take a little time, I have to get the 6 on the road... hopefully in the next 2 weeks ( I have to travel for work next week).

We're not too far from each other so if you are totally stuck, hit me up. You have to be able to get to the adjustment screw which is that hardest part, removing that darn epoxy. You cant adjust without doing that.

I rebuilt mine, it holds vacuum, and all the electrics check out so far.

I'm not sure I understand half of the technical detail involed in MPS tuning and I don't have the equipment, so I'm looking for someone in the Southern California area that can provide this service. I know that I will have to add a Bung to my Bursch exhaust (cylinder #3?) Any advice or reource would be appreciated.

Thanks-Rick

Robert @Robarabian do you have any MPS tuning contacts in So Cal?

Thanks-Rick

Thanks Robert, I'm currently rebuilding my motor-my MPS is working but I found a lot of carbon in the heads. So I hope to have it running late January and begin the break in. I'll see how it's running and probably contact you early spring to see if an adjustment can be made. I do have a question regarding welding in the bung, I have a Bursch exhaust - should the bung be welded in #3 exhaust and what size and threads on the bung?

Thanks again for the advice-Rick

[Robarabian]

PM me and we can talk offline and keep this from bumping up top... That part is easy.

Hi Rick. As I said in my post, I obtained the same test meter that PB Anders referred to. I have mine rebuilt now and bench adjusted. I got side tracked on my 914-6 conversion car and this car has been sitting. But it is installed. My goal is to get it started and then do some adjusting. I purchased an AFR meter that I can install, and I also have access to a CO meter for adjustment. I am learning it as well since there is nobody reliable around me that does it. I am happy to help you bench set yours up. If I am successful with the AFR install and tuning, Im happy to share the knowledge. It just may take a little time, I have to get the 6 on the road... hopefully in the next 2 weeks ( I have to travel for work next week).

We're not too far from each other so if you are totally stuck, hit me up. You have to be able to get to the adjustment screw which is that hardest part, removing that darn epoxy. You cant adjust without doing that.

I rebuilt mine, it holds vacuum, and all the electrics check out so far.

I'm not sure I understand half of the technical detail involed in MPS tuning and I don't have the equipment, so I'm looking for someone in the Southern California area that can provide this service. I know that I will have to add a Bung to my Bursch exhaust (cylinder #3?) Any advice or reource would be appreciated.

Thanks-Rick

Robert @Robarabian do you have any MPS tuning contacts in So Cal?

Thanks-Rick

Thanks Robert, I'm currently rebuilding my motor-my MPS is working but I found a lot of carbon in the heads. So I hope to have it running late January and begin the break in. I'll see how it's running and probably contact you early spring to see if an adjustment can be made. I do have a question regarding welding in the bung, I have a Bursch exhaust - should the bung be welded in #3 exhaust and what size and threads on the bung?

Thanks again for the advice-Rick