VNT turbo is fitted photos

[simmo]

A long day, but he VNT is fitted, going for a test drive to chinchilla tomorrow. A drive around the block seems to have good torque on take off.:eek:

[steveG]

Mmmm. Nice shiney stuff :)

Do you have boost and EGT gauges fitted? If so, how early does it start to build boost?

Steve

[2stroke]

Looks like a lot of turbo. Neat setup, looks a lot more accessible than the original setup. is the turbo as close to the washer bottle as it looks? Also interested in the egts and performance.

[simmo]

Yes it close only a few cm to spare the compressor casing almost touches the plug for the washer motor. I wrote and informed them that could be a refinement for future models, I don't see it as a big problem yet. I keep an eye on it and make a small heat shield if required. I'll need to increase the fueling over my adjustments done already, when I fitted the APT intercooler. But I'll run o the existing settings for a week or so. I monitor the EGTs and boost on the trip.

[DEF95]

Looks good, It you don't mind me asking where did you get it from and how much did it cost? Thanks

[DoAll]

Just wondering which model VNT did you use

[simmo]

VNT is a Garrett 2256V. The kit is from madman in south Africa, the cost at the time was 1800$ plus $300 freight , but that's dependent on the exchange rate.

I've just done a 650 km round trip to chinchilla to visit friends. Via Toowoomba and Dalbly so there was some good hills to try out the new turbo. My observations so far are.
The dead band low down in the rev range is gone, I have a boost almost from idle and the power build up is seamless. It's never going to be TD-5 or a V8, but it's a definite improvement.

The power for hill climbing at highway speeds is much improved I can hold 100km/hr up most of the hills in top gear simply by putting my foot down. Earlier my foot would be flat to the floor. and the EGTs would be climbing rapidly, engine temp going up, and the engine would be slowing down and falling off the torque curve.

The EGTs are about 50 deg lower than usual.and I have 3 or 4 PSI more boost all the way through the rev rang, and that pressure is now measured at the manifold not the turbo charger outlet. The increase in boost pressure is probably caused by the increased efficiency of the more modern turbocharger. The engine is running cooler, water temperatures stay at about about 82 deg even on long climbs, oil pressure is holding over 3 bar, a sign the oil is staying cooler.

My impression is a good improvement in drivability, I expect it will be very noticeable off road or in the sand etc.

My fuel pump had some minor tuning after I fitted the APT intercooler, (stop screw and diaphragm only) but none since I fitted the turbo, so I'm thinking some increase in the fuel pump settings will need to be done to get the best out of the new turbo. I'v not seen any EGTs over about 580 deg even on very long climbs.

[Vern]

How is the vnt controlled? (Opening and closing of the vanes)

[noogie]

The Allisport VNT turbos are $1850 landed.
Any reason you chose this turbo?

I want to do the same and want to consider all options.

[simmo]

I researched the time and they were about the same price to buy, but freight was more expensive from the UK. i chose this type of set up because the turbo is bolt on not part of the manifold, it looks good and has good access etc. and there was lot of information about the performance results dyno graphs etc. personal choice really. The allisport has got a good reputation and has a cast manifold that fits very neatly.

[460cixy]

Is there a spot in the manifold for the egt probe before the turbo of is it case of drilling and welding in an adaptor ?

[simmo]

you can see the EGT probe fitted, I drilled and tapped the hole on the turbo inlet flange myself. MM did drill and tap a port for me on the aft side of the flange, but it did not suit my existing EGT probe.

[460cixy]

I see nice spot for it should of looked at the pics

[simmo]

The Mad man VNT has clocked up 2000 kms since fitting, and I'm still happy. EGTS are lower, probably by 50 degrees. Even on long hauls up hill I don't reach 600 deg. Much more torque for pulling up the hills in 5th or 4th. Can keep up with the traffic on the freeway up hill and down dale at 110 km/hr . Drove on the beach to Rainbow beach and on the tracks ( recently graded, in good condition, and easy going). But the increased torque makes sand driving easier, and easier to cope with hills etc on the tracks. I haven't had time to any further fuel pump mods, than those done for my APT inter-cooler. I think to reach the full potential, I need to to more fuel pump adjustments. I bought a second hand exhaust down pipe from BOR, since mine has a big dent in it, I'm in the process of wrapping it with fiberglass tape, up to the first join. Plus have the central muffler replacement pipe on order.:)

[460cixy]

Stop it I'm geting jealous

[simmo]

I picked up this good second hand down pipe from BOR, and insulated it before fitting. I jacked the car up on the chassis as high as i could on the LHS, and pulled the pipe out forward. I was able to get the new pipe in without damaging the new insulation OK. It has fiberglass cloth and aluminium foil tape, plus SS cable ties. My old pipe was still in good condition except for a fairly deep crease, I vaguely member running over a log once.

[Vern]

Soooo, how is the vnt controlled?.:)

[simmo]

The actuator is a diaphragm type is under slung under the turbo. It senses the pressure at the inlet manifold. seems to work OK. I probably should track down a spare.

[uninformed]

Vern, it is pressure actuated. Looks like the waste-gate on the 300tdi turbo, but it is actually the actuator.

Simmo, keep an eye on the pressure actuator rod end, where the pin from the VNT lever passes through it. These are known to flog out.

The turbo can soot up and make the vanes sticky which then loads up that rod end.

What is the opinion of installing a egt probe same position as Simmo's (exhaust manifold flange) but in a cast manifold?

My 2.8tgv manifold doesn't have a nice spot like the Tdi and its all cast.

[Vern]

My vnt is vacuum operated with a Dawes valve to open and close the vanes, for now I have the vanes wired shut as it was making odd noises when they were half way opened. Am wondering if pressure actuating is easier/better.

[uninformed]

My vnt is vacuum operated with a Dawes valve to open and close the vanes, for now I have the vanes wired shut as it was making odd noises when they were half way opened. Am wondering if pressure actuating is easier/better.

AFAIK, there are only a hand full of pressure actuated VNT turbos. Most seem to be vacuum

As far as having them shut? all I know is when my rod end broke, the car lost power and egts where noticably higher for a given road speed in "x" gear

[simmo]

I drilled and tapped the hole in my old cast 300tdi manifold just before the turbo inlet. worked ok fora few years until i changed to the VNT,

[uninformed]

I drilled and tapped the hole in my old cast 300tdi manifold just before the turbo inlet. worked ok fora few years until i changed to the VNT,

any idea how thick it was at that point?

[simmo]

I drilled the port just in the center of the manifold near the turbo entry. The metal there is about 6 mm thick. you can move it over to the right a bit towards the bolt for the small hatch the metal is getting thicker there, and its closer to the turbo inlet :)