MTDI building and tuning. New Holset p.7, plan runing 30 psi!

[vic003]

And here are my new little rims I love







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[vanbcguy]

The TDI spring is pretty soft from what I understand; the electronic pumps regulate advance via a valve rather than relying on case pressure. I think the spring will allow full travel of the timing piston pretty quickly; the ECU is supposed to be able to ask the pump for whatever it wants rather than relying on RPM. Libby is probably right in saying that it will cause excessive advance at midrange RPMs. Worth trying and seeing though!

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[vic003]

Hum, I read that TDI spring is too soft too, but I don't think I have better options currently.
The timing on electronic controlled pump is not so simple as pump internal pressure has à great effect too, but it's easier too control with vagcom.
In my choice of springs, I have TDI, Renault dti (wich is basically a TDI with 11mm head) wich is stiffer, and after commons TD spring, I don't know with which one begin!

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[vanbcguy]

I'd be going for the Renault spring personally. It probably was being used on an engine with a similar RPM range.

The TD timing cover is much shorter than the TDI one so the TD spring will be too short too.

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[vic003]

Thanks, sounds good, I must try the hardness of the différents spring.
The tdi spring isn't a good choice?
The problem for the Renault is that is used in an electronic pump with n108 too.
Second problem, I have all my pump parts in a box and I don't know which one it is. Do you know the lenght of the Tdi spring please?

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[vanbcguy]

Ah gotcha. Didn't realize the Renault pump was electronic too.

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[vic003]

Yes but the spring hardness isn't the same than tdi one.
Actually I run with the Iveco one but designed for 2.5L low rpm engine.
What can I find in mechanical and adapted for same displacement engine?
In Europe I know the Fiat croma which is 2.0l tdim but nothing else in my mind.
And is there a shop where I can buy only the advance spring? I don't have money to buy complete pumps and hard to find em.

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[vanbcguy]

Well I can tell you my LR pump with its stock spring is working fine for me. There is a little clatter at medium speed which I might be able to tune out with a shim but it really isn't a problem. The Rover engine was set up to go to 4500 RPM with the same style of injectors, seems to work fine.

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[vic003]

Hi! It's been a while!
I got a new job so my project got slow down as I'm at home only the week-ends.
As you sayed, the rover engine was set up to go to 4500rpm, my pump is for an engine wich run max 4000rpm so I think the timing doesn't match perfectly with TDI.
You didn't change anything on the timing of your LR pump? I know there are some hp to gain with the timing, it was an important mapping job on e-tdi.
So I still searching for the perfect spring and piston, maybe fiat 2L tdid.

I had to change my direction boots yesterday and I saw the frame part that link the 2 wheels together and support engine (sorry don't know english name) were bended and full of rust, so it's the job for saturday and I'm searching for an anti sway bar as all is removed!

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[vanbcguy]

E-tdi also had much more effort put in to keep NOx levels down. Advanced timing = NOx. The LR pump comes from a light truck application which has much higher limits, so they were able to use more advance in the first place.

I talked to Goran (Dieselmekken) about my goals and told him what pump I was using. He didn't seem to think the advance would be a problem 

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[vic003]

Ok, good to know. So I think I'll go for Landy pump and try with the internals in my pump. Do you know the diff between 200 and 300 tdi pumps?

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[vanbcguy]

From what I've read I believe the 200 pump comes with a more aggressive camplate. They both have an 11mm head. The 200TDI pump probably has a little more performance potential but it isn't as capable of higher RPMs. Both will run a VW TDI engine/injectors well up to 4500+ RPM; if you need more than that then you probably should be talking to a pump builder anyhow.The 300TDI pump seems to have a "smoother" camplate, probably for reduced NOx levels and less cabin noise. Both are bonuses in my book, provided the vehicle will do what I'm asking of it.

[vic003]

Thanks for these infos!

Some pics of the week-end:

New subframe, reinforced and with anti roll bar.

And a gift for my little car:





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[vic003]

Ok, I still have a tuning and optimisation problem.
I actually run 25-26psi, light black smoke when full boost so I use all the o2 but the power output is low, I estimate 150 or 160 at the crank, low for 25 psi with k24, don't you think?

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[vanbcguy]

K24 @ 25 PSI is probably at best 60% efficient meaning 40% of the energy put in to it by the turbine is just making heat. What is your intercooler like? Do you have any way of measuring intake air temperature?

The worse the efficiency of the turbo the more restriction it needs to put on the exhaust to make the same pressure ratio too.

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