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Author Topic: MTDI building and tuning. New Holset p.7, plan runing 30 psi!  (Read 23273 times)

Reply #45June 28, 2016, 11:01:34 pm

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #45 on: June 28, 2016, 11:01:34 pm »
Thank you guys, I found a AAZ manifold for free, a guy gave me one for changing the injection pump of his mk2!

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Reply #46June 29, 2016, 11:21:24 am

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #46 on: June 29, 2016, 11:21:24 am »
Ok, new manifold in place!


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Reply #47July 01, 2016, 06:13:44 pm

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #47 on: July 01, 2016, 06:13:44 pm »
Guys, what should I use for initial timing with this pump and 11mm head?
I'm set it actually at 1mm and start well, can I have more economy with different setting?

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Reply #48July 02, 2016, 12:43:34 pm

vanbcguy

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Re: MTDI building and tuning, goal 25 PSI
« Reply #48 on: July 02, 2016, 12:43:34 pm »
Your pump is made from bits; there's not really a set point. You'll have to play a bit and see what works best!

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Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #49July 02, 2016, 03:32:43 pm

libbydiesel

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Re: MTDI building and tuning, goal 25 PSI
« Reply #49 on: July 02, 2016, 03:32:43 pm »
I agree.  Considering the parts used, short of having a pulse adapter and strobe, your guess is as good as anyone's.  My guess is that it will run best somewhere between 0.95mm and 1.55mm of plunger lift...

Reply #50July 02, 2016, 06:55:28 pm

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #50 on: July 02, 2016, 06:55:28 pm »
Lol I just wanted to have your opinions too and that's good.
French guys always say to set at 1mm regardless the parts you run in your pump.
So I first started with 1mm and will see for improvement, just I saw 1,54mm for range 300 tdi and found that high!

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Reply #51July 02, 2016, 07:21:00 pm

libbydiesel

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Re: MTDI building and tuning, goal 25 PSI
« Reply #51 on: July 02, 2016, 07:21:00 pm »
In my experience building and tuning quite a few different pumps, assuming the dynamic advance is functioning properly they run best (universally) with the actual start of injection set to 12° BTDC.  The plunger lift measurement for achieving a start of injection at 12° BTDC can vary widely depending on which camplate, injectors, plunger head assembly, and delivery valves are used.

Reply #52July 06, 2016, 10:07:52 am

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #52 on: July 06, 2016, 10:07:52 am »
Ok must try to get a strobe to correctly tune this pump.
Yesterday I fit my timing belt cover, and a little modification was made by heat and reshaping it but it's good!
But I saw another problem, I have an exhaustive leak between manifold and turbo. I now there is no gasket existing for k24, maybe you have a solution ?

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Reply #53July 06, 2016, 10:44:39 am

libbydiesel

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Re: MTDI building and tuning, goal 25 PSI
« Reply #53 on: July 06, 2016, 10:44:39 am »
I use a smear of Permatex Ultra Copper between the turbo and manifold.  If the surfaces are bad, I lap them beforehand. 

Reply #54July 12, 2016, 05:09:28 pm

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #54 on: July 12, 2016, 05:09:28 pm »
Found the problem! It was a little shock on the turbo flange  that created excess of thickness on the flange.


Other thing, I made a test run sunday, drove 30 minutes and found the pump temp very hot, is this normal?

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Reply #55August 25, 2016, 06:42:01 pm

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #55 on: August 25, 2016, 06:42:01 pm »
Hi mates!

Approx 2 months later, the MTDI runs well, I use it as my daily to see reliability. So now plan is to imprive tuning, turbo is runing approx 25 psi,and I'm still lean in my air/fuel ratio with no smoke and approx 150hp, seems good :)
I'll increase slightly fuel too see when it begin to smoke, and I have a question about 2.5TDI pumps from ducato, I think they are almost same then Landy 300tdi pumps.

In which way must I go to adjust advance curve? In my opinion the spring is softer then one for TDI due to the lower RPM limit. Am I good?

Next week little golf will get bling bling rims, very originals parts, wait for pics!

Reply #56August 25, 2016, 07:26:34 pm

libbydiesel

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Re: MTDI building and tuning, goal 25 PSI
« Reply #56 on: August 25, 2016, 07:26:34 pm »
If the advance spring is softer the advance will occur faster.  You may get significant nailing at mid or high rpms with increased advance. 

Reply #57August 26, 2016, 02:09:52 am

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #57 on: August 26, 2016, 02:09:52 am »
Yup I know that, but am I right when I think that 300tdi and Ducato pumps have softer spring then needed?
I don't know how is the advance curve on these engines but I know the tdi one very well.
For me it's the harder point when tuning a mTdi, with electronique I just had to put the value I wanted on Winols!

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« Last Edit: August 26, 2016, 02:12:56 am by vic003 »

Reply #58August 29, 2016, 03:15:32 am

vanbcguy

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Re: MTDI building and tuning, goal 25 PSI
« Reply #58 on: August 29, 2016, 03:15:32 am »
There's two parts to it - the spring and the shim(s). The shims add preload which delays advance from starting. The stiffness of the springs control the curve. A soft spring with lots of preload will behave differently than a stiff spring with little preload - the soft spring with preload will delay starting advance then add it on quickly while the stiff spring will add advance more progressively but may not have as much total advance.

Yes, you are correct that the stiffer the spring the later the advance. I'd wager the springs are probably stiffer than needed if anything though - advance causes NOx which is controlled in most markets. The ideal advance curve for optimal performance is not the same as the ideal curve for minimal NOx production.

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1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #59August 29, 2016, 06:43:20 pm

vic003

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Re: MTDI building and tuning, goal 25 PSI
« Reply #59 on: August 29, 2016, 06:43:20 pm »
Thank you for your answer, the app didn't notified it so I didn't saw it earlier!
Ok, that's what I thought, so will try TDI spring with more shims, then less timing advance at low rpm to help turbo charging and more advance at high rpm to improve fuel combustion and had high boost fuel. Do you think it's the good start or should I try a stiffer spring?
I should invest in a spring hardness measurment tool.

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