The mk3 1.9L TD power-quest

[Jarred]

oh bummer! i was looking forward to this!

[gldgti]

OK, my car is back on the road finally. I fixed the wastegate issue (pull the turbo) and I also added a microswitch to control the electronic timing retard solenoid on the pump, so now I have full advance from about 10% accelerator instead of from 2800rpm. (When I say full advance, I mean full static advance, as the standard control simply retards the timing a static value (like 3-4 degrees) below normal for any given rpm, from idle to 2800. Now I have "normal" from 10% accelerator, at any rpm - what the heck does all that mean? basically I get more torque everywhere below 2800rpm, and I keep a quieter idle (sans diesel nailing) - the one disadvantage of having the "normal setting all the time).

Its much better.

I'm waiting on a Turbotech manual boost controller before I dyno the car. Might be tomorrow, could be next week.

Fun Fun!

[Jarred]

I'd love to get my hands on a mk 2 TDI. so much sootin' good fun

edit: mk 3

[gldgti]

All you need to do is chuck a TD in yours... you still have that?

Loon has a couple of SDI 1.9's that are just begging to be fettled and turbo'd. I don't know why people keep going with all the hassle of wiring crap up with 1.8T's in mk1/mk2's when all you need for a diesel is 12V and a glow plug circuit. At least with a diesel you can enjoy it without the guilt or expense

[Jarred]

I meant mk 3 TDI. oopsy. Nothing like factory goodness. I'd need to get rid of the mk 2 first. which means I have to fix it. Summer project!

[ryana89]

I don't know why people keep going with all the hassle of wiring crap up with 1.8T's in mk1/mk2's when all you need for a diesel is 12V and a glow plug circuit. At least with a diesel you can enjoy it without the guilt or expense

You sir have just givin me a goal!!!
The thought of a MK2 TDI

Btw read your entire thread and am quite astonished, you've turned the humble, reliable diesel into a monster....aswell as re-confirming my belief that diesels are superior

I'll be watching this thread.

[gldgti]

Boost controller arrived and in this afternoon - 21psi in first gear up to 5000rpm and in every gear after that.

Weeeeeeeeeeee

Dyno later this week... i have no idea what it will do. I'll be happy if I see 110hp.

[gldgti]

Booked in for dyno Friday afternoon. Sorry it took so long kids.

[Jarred]

still wanna see some numbers

[gldgti]

OK did the dyno run.

3 runs, made 83kW every time.... thats 110hp in the old speak. I'll put up the scan of the print out when I get home later for you.

Torque curve is interesting, and I'm a bit confused by the whole deal because the scale on the torque curve seems to be out, but the peak value (not on the curve, but the number printed) correlates perfectly to the power curve.... maybe the scale is wrong. I'll go grab another print out on monday with a correct scale.

Anyway, it was extremely consistent and rev'd all the way to 5600RPM!!!!! Power really falls off past 4700 though.

As for the tune, its not too smokey at the moment, i'm convinced it would make a lot more power if t wasnt running out of fuel so much at high revs. A/F ratio went from 9:1 at 1800rpm (off boost) all the way to 30:1 at peak power. Best for power in a diesel is about 15:1, so theres plenty of power to be had there, if I can mod the pump to do it.

On the downside, its really obvious how it doesnt get going under 3000rpm, mainly because of the turbo lag. And, I can't help thinking that I could make 110hp with the K14 (though maybe a bit lower in the rpm range), and gain a bunch of torque to boot.

We shall see. Maybe I just need ot join the VNT crowd?

[Jarred]

nice!

josh's polo made 80 odd kw, and preeny's van too I think.

I reckon a VNT would be the way to go. I've driven josh's a fair few times, and it's just so nice and smooth, bugger all lag to speak of!

(I know if I had a mk 3 TDI, i'd look at going VNT, or hybrid something )

[gldgti]

Bet thats one of the weirdest VW diesel dyno plots around.

Notice how much more like a petrol car's the power curve is.

I'm a little disappointed (but not surprised) at the low peak torque value. I really put that down to lag - its easy to see the turbo really doesnt wake up until 3000rpm. But then, its also pretty obvious that it does reasonably well up to 4700, which is much higher than I thought it would be worth revving to.

I will now look at doing some "passive" mods to improve hhe low down torque - maybe some exhaust modifications (delete muffler and maybe make a new down pipe for earlier spool) and I really want to get in and make an intake manifold with nice long runners, because the stock manifold is absolute trash. That, I reckon, could make a big difference overall, and with a little extra fueling, i don't see why an extra 10-20hp isn't available just with those mods.

I've gotta say though, its nice to put a number to my efforts so far - and given that this beast was 74hp (at the flywheel) when it rolled off the production line 16 years ago, and now 253,000km later it can make 110hp at the wheels, I'm pretty happy

video - http://www.youtube.com/watch?v=DC1VeOgegac

[gldgti]

nice!

josh's polo made 80 odd kw, and preeny's van too I think.

I reckon a VNT would be the way to go. I've driven josh's a fair few times, and it's just so nice and smooth, bugger all lag to speak of!

(I know if I had a mk 3 TDI, i'd look at going VNT, or hybrid something )

I wonder who would win a drag between josh and me?
(personally, i reckon he'd look better in a dress than me, i have a beard....

[Jarred]

it would be interesting, that's for sure.

You might have the edge in slightly less weight, but he's practically always on boost, so who knows...

and josh wouldn't look good in a dress. no one wants to see that! :|

[WABIT]

nice!

josh's polo made 80 odd kw, and preeny's van too I think.

I reckon a VNT would be the way to go. I've driven josh's a fair few times, and it's just so nice and smooth, bugger all lag to speak of!

(I know if I had a mk 3 TDI, i'd look at going VNT, or hybrid something )

hey jarred! Correct me if I'm wrong, but aren't 9N Polo turbos' non VNT?