What are the differences between VP34 and VP37?

08-11-2006, 14:31 Subject: What are the differences between VP34 and VP37?

Hi,
Yes, yes, in the year of construction...

I'd be interested to know what improvements Bosch made when transitioning from the VP34 to the VP37 fuel injection pump.

Regards,
Jens.

08-11-2006, 16:12 Subject: What are the differences between VP34 and VP37?

I'm going to consult my "Diesel Engine Management" book.

If I forget, please remind me.

m;

08-11-2006, 19:24 Subject: What are the differences between VP34 and VP37?

Sorry,

Besides the image, which can be found as a PDF excerpt from the book on Google, I haven't found anything else immediately.

m;

08-11-2006, 19:40 Subject: Re: What are the differences between VP34 and VP37?

Jens 16syncro wrote:

...
What Bosch "improved" when transitioning from the VP34 to the VP37.

As far as I can recall from the documents:

VP34: RWS as a potentiometer.
VP37: RWS as an inducer.

08-11-2006, 21:22 Subject: What are the differences between VP34 and VP37?

Hi Bertil,

I would have thought so too, but the Bosch manual shows the VP37 as having a round connector, which indicates a potentiometer.

However, the book is not without its flaws, as in one illustration, VTG and VST are reversed.

m;

08-11-2006, 23:48 Subject: What are the differences between VP34 and VP37?

dieselmartin wrote:

... but the Bosch manual shows the VP37 as having a round connector, so it's a potentiometer.
...

The connector type depends entirely on the application and has nothing to do with the pump type.

A4 Limu 07/96 AHU@110PS 192tkm 08/05-05/08 A4 Avant 08/01 AWX 05/08-

Does the VP37 not produce higher peak pressures than the VP34?

09-11-2006, 12:33 Subject: What are the differences between VP34 and VP37?

I have a pump with a potentiometer inside, as far as I know it's a VP34. What are you getting at? Pumps with potentiometer controls and those with HDK sensors are not interchangeable.

09-11-2006, 18:44 Subject: What are the differences between VP34 and VP37?

bastion wrote:

Doesn't the VP37 achieve higher peak pressures than the VP34?

No...

Are you referring to the VP36? That's a VP (vehicle platform) with electrical signaling and a HDK (hardware development kit) for an IDI (indirect injection) engine. She produces smaller, more delicate prints.

Quote:

Pumps with potentiometers and those with HDK sensors are not interchangeable.

Maybe. If you replace the electronics (MSG...) behind it, then yes.

10-11-2006, 1:04 Subject: What are the differences between VP34 and VP37?

Thank you for the statements.
Is that it, just the RWS change? I can't imagine that.

Regards,
Jens.

A4 Limu 07/96 AHU@110PS 192tkm 08/05-05/08 A4 Avant 08/01 AWX 05/08-

It's possible that they've fixed some initial bugs and improved other aspects. These are likely just minor details, but collectively they might be significant enough to warrant a different model designation. Only Bosch probably knows the details.

11-11-2006, 19:11 Subject: What are the differences between VP34 and VP37?

Jens 16syncro wrote:

Thank you for the statements.
Is that it, just the RWS change? I can't imagine that.
...

Why should there be more?
Both pumps were manufactured and developed in parallel at BOSCH. Only Volkswagen switched from the Potipumpe to the HDK pump (even though the HDK pump was more expensive).

07-01-2018, 23:05 Subject: What are the differences between VP34 and VP37?

Can anyone tell me if it's possible to convert my 1Z Audi 80 B4, which currently has a VP36 injection pump and a flow meter, to use a VP37 injection pump and a mass airflow sensor?

And what exactly would I need for that?

Thank you very much.

Best regards,
Lg Flashcool.

08-01-2018, 10:07 Subject: What are the differences between VP34 and VP37?

Yes, I can, but it would be quite extensive.
With the mass airflow sensor, the air intake system changes almost completely (filter housing, hoses, position of valves and sensors). For this and for the VP37, you need a suitable mass airflow sensor and the corresponding wiring harness. The turbocharger pressure sensor is being integrated into the control unit, and an altimeter is being added.
It only makes sense if you have a suitable Audi 80 B4 that you can use for spare parts. Replacement parts are almost exclusively available through Audi Tradition, if at all.
Eight weeks ago, we could have come to an agreement about my Audi 80; a recycling company would have even been willing to take it apart for spare parts.
hg
Herbert.