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#45
by
vic003
on 28 Jun, 2016 23:01
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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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#46
by
vic003
on 29 Jun, 2016 11:21
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Ok, new manifold in place!
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#47
by
vic003
on 01 Jul, 2016 18:13
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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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#48
by
vanbcguy
on 02 Jul, 2016 12:43
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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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#49
by
libbydiesel
on 02 Jul, 2016 15:32
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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...
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#50
by
vic003
on 02 Jul, 2016 18:55
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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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#51
by
libbydiesel
on 02 Jul, 2016 19:21
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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.
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#52
by
vic003
on 06 Jul, 2016 10:07
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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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#53
by
libbydiesel
on 06 Jul, 2016 10:44
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I use a smear of Permatex Ultra Copper between the turbo and manifold. If the surfaces are bad, I lap them beforehand.
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#54
by
vic003
on 12 Jul, 2016 17:09
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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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#55
by
vic003
on 25 Aug, 2016 18:42
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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!
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#56
by
libbydiesel
on 25 Aug, 2016 19:26
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If the advance spring is softer the advance will occur faster. You may get significant nailing at mid or high rpms with increased advance.
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#57
by
vic003
on 26 Aug, 2016 02:09
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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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#58
by
vanbcguy
on 29 Aug, 2016 03:15
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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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#59
by
vic003
on 29 Aug, 2016 18:43
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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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