D-Jet MPS Diaphragm Replacement/Tuning Kits - In Stock, Sale price ends tomorrow night, 12/30/2012 Options

[ChrisFoley]

Help me here and no disrespect. what would be the advantage ( your quality would be better) to buy your kit when I could buy off the rack a MPS rebult from one of the main steam venders.
Wes

I've never bought one of the rebuilt units available from PP etc. but others have commented on poor quality/performance. For one thing, I don't think the re-manufacturer is using a beryllium copper diaphragm.
There are lots of broken units out there being stored for the day when new diaphragms become available.
They are a potential DIY repair component for the more adventurous 914 owner.
Anyone who wants to tune their own D-Jet FI with a wideband AFM installed needs the assembly to be adjustable. The remanufactured units are most likely epoxied shut again, making them non-adjustable.

[SLITS]

I believe that PP would get their units from Fuel Injection Corp (Old Brett Instruments). They used a stamped steel diaphragm which didn't have the same flex characteristics. Whether they actually calibrate them is a question.

The ones I had rebuilt by Python were not calibrated and they didn't disturb the expoy. They used used diaphragms from other units.

The only one I knew that would calibrate them with a Wavetec was Blyseng.

I don't know what George does.

You could offer the kits to the rebuilders too! There a hundreds clamoring for MB, Volvo, VW, BMW, etc units.

[scott_in_nh]

I haven't seen Scott post in awhile but he was calibrating MPS's for a few members, he might be interested in doing it as a service.

Sorry for the lack of posts lately, The car is running great so I've been indulging myself in RC Helicopters....

I have access to the proper meter at work, but would consider purchasing one if I could break even doing some calibrations.

My experience indicates that at a minimum the factory calibration is way to lean if you have an aftermarket exhaust.

It also indicates that another couple of turns out gets you a good running car, but I think the right way to tune these is on the car with an oxygen sensor.

My theory is that with tightening emission standards they set cars to lean kill in the seventies, add 10% ethanol and you are leaner, popular mods and you are leaner still....

So be careful in what settings you ask for or be prepared to be dissapointed!
Chris I don't need one right now (I have a good copper one for now), but would be interested down the road.
If I "had" to buy one now to make it worth it to you I would.

[914_teener]

I haven't seen Scott post in awhile but he was calibrating MPS's for a few members, he might be interested in doing it as a service.

Sorry for the lack of posts lately, The car is running great so I've been indulging myself in RC Helicopters....

I have access to the proper meter at work, but would consider purchasing one if I could break even doing some calibrations.

My experience indicates that at a minimum the factory calibration is way to lean if you have an aftermarket exhaust.

It also indicates that another couple of turns out gets you a good running car, but I think the right way to tune these is on the car with an oxygen sensor.

My theory is that with tightening emission standards they set cars to lean kill in the seventies, add 10% ethanol and you are leaner, popular mods and you are leaner still....

So be careful in what settings you ask for or be prepared to be dissapointed!
Chris I don't need one right now (I have a good copper one for now), but would be interested down the road.
If I "had" to buy one now to make it worth it to you I would.

I agree from experience.

Recieved a rebuilt unit from FI Corp. They sealed the end so I would assume initially it was set. The car ran "ok" but I have found that it IS running lean...especially under full load.

I think they are also running a steel diaphragm as Ron says, so I am not sure if that is the problem or not. I know this....when I ran the original....it ran better through mid-range and top end for sure.

I am committed to FI but am yet to be convinced that the MS is better although the conversions done by a few look interesting.

I will be installing an AFR meter in the car and then reset the load settings if I can on the rebuilt unit.

I have digressed from the original post..... I am interested Chris.

[wingnut86]

I'll just sell stuff till I hit $130.

Put me down for "1"

I have a box of used-less ones as well (IMG:style_emoticons/default/dry.gif)

[ConeDodger]

I have a couple used ones as well... No need to rebuild though... I am running SDS (IMG:style_emoticons/default/biggrin.gif)

[Mikey914]

I admire your willingness to take this on. I actually looked into this as the procedure for duplicating the part is not too dificult, not inexpensive, but the material but parts can be made. The main issue I ran into with these is how do you callibrate it correctly?

There is a thread I may be able to find that detailed the measurements for the outputs. This will be helpfull. The main issue is the reassembly, not just putting it together, but at what presure. The base line reading will vary with the pressure altitude at which it's assembled.

The "standard" I would assume would be standard day at sea leavel 101.3kPa. The other part of the equasion is the temperature, it should be 15C at this pressure.

I'm not too sure how close is close enough, but calibration will more than likely require some equipment, unless you are at standard pressure and temperature. Then you could just close it up and check the output.

And yes, if this can be worked out put me down for 1 as I have a dead one also.

[TJB/914]

I agree with the lean issue.

Put me down for (1) rebuild kit.

Tom

[ThinAir]

I'm envious of you guys who have the ability to make this stuff! Well done!

I'm in for 1.

[Bleyseng]

I believe that PP would get their units from Fuel Injection Corp (Old Brett Instruments). They used a stamped steel diaphragm which didn't have the same flex characteristics. Whether they actually calibrate them is a question.

The ones I had rebuilt by Python were not calibrated and they didn't disturb the expoy. They used used diaphragms from other units.

The only one I knew that would calibrate them with a Wavetec was Blyseng.

I don't know what George does.

You could offer the kits to the rebuilders too! There a hundreds clamoring for MB, Volvo, VW, BMW, etc units.

Yeah, they used the steel diaphragm that gave a less than smooth transition compared to the OEM MPS units. I have a box of 50 dead MPS units and could make a run of em if I had the diaphragms. Using a Wavetek its easy to calibrate em just like in the Factory as Bosch used something similar to make batchs of them.
For a 2056 I use my car as the baseline with a LM Meter as MPSs have to adjusted in a car for the correct mix vs a Wavetek to get "right". I just didn't have any luck using the Wavetek to make a batch of MPSs for a 2056.

The other variable is the ECU's as for a 2.0l there is the 73 one, the 74 one and the 75/76 one. They got leaner each year from what I have tested. But if you have a stock cam you can use a stock calibrated MPS set up witha Wavetek.

IMHO the PP ones were set up too lean at WOT maybe setup for a 1.7L so a 2.0l will run lean using them.

[billh1963]

Put me down for two!

[plas76targa]

Chris, count me in for 1. PM details when $$ needed.

[cary]

Just a heads up for those looking to purchase the meter and do the repair themselves.
The Wavetek Meterman LCR55 is discontinued.
The suggested replacement is the Amprobe LCR55A. Component Tester.
I have one coming. I'm at $202 with a padded case.
Coming from Tequipment.

http://www.tequipment.net/AmprobeLCR55A.html

[worn]

I admire your willingness to take this on. I actually looked into this as the procedure for duplicating the part is not too dificult, not inexpensive, but the material but parts can be made. The main issue I ran into with these is how do you callibrate it correctly?

There is a thread I may be able to find that detailed the measurements for the outputs. This will be helpfull. The main issue is the reassembly, not just putting it together, but at what presure. The base line reading will vary with the pressure altitude at which it's assembled.

The "standard" I would assume would be standard day at sea leavel 101.3kPa. The other part of the equasion is the temperature, it should be 15C at this pressure.

I'm not too sure how close is close enough, but calibration will more than likely require some equipment, unless you are at standard pressure and temperature. Then you could just close it up and check the output.

And yes, if this can be worked out put me down for 1 as I have a dead one also.

I agree. I would be in if it was possible to then take a rebuilt unit and calibrate it. I found this author very very helpful in getting my FI running well. Here is a description that I think people probably know about.
http://members.rennlist.com/pbanders/manif...sure_sensor.htm

A kit of repair parts would be massively more valuable with a good piece of technical writing to go with it. So, although mine works at present, I would be in.

[ChrisFoley]

This morning I figured out how I'll make the hollow 7mm allen wrenches for the adjusting tool kit.

At present I've been making adjustments to the unit in my DD, using a Narrow Band O2 gauge to see the results of each adjustment. A W/B would be better though.

I only need cost data on one more component of the repair kit to firm up the sales price. I should be able to make the G/B formal announcement within a week.

[JRust]

I'd be in for one or 2 also! Thanks

[walterolin]

I have room on my shelf for one.

Thanks
Olin

[KELTY360]

I'd be in for one or 2 also! Thanks

(IMG:style_emoticons/default/confused24.gif) Jamie, I thought you were all in on the LS1 conversion and liquidating all your other 914 shtuff. 2nd thoughts?

[cary]

Here's the quote I finally got back from Bosch's factory rebuild service.

Good day!

Depending on the part number ... between 349 and 599 EUR (incl. 19% German VAT) plus shipping.

Mit freundlichen Grüßen / Best regards

Matthias Klumpp

Robert Bosch GmbH
Automotive Tradition (AA/ATR2)


Whoa ............

[EdwardBlume]

I'm in just to support the cause. (IMG:style_emoticons/default/cheer.gif)