Diesel Modification - Page 2 - Fuel Economy, Hypermiling, EcoModding News and Forum

Christ · 05-17-2011, 10:13 AM

The VAG AHU TDi is 89hp and 149tq...

The BMW 2.4 is 114hp and 162tq, and will probably cost twice as much, and weigh more as well.

That power or more can be made perry easily from the AHU, which will be very easy to get from a wreck in Canadia.

I still want to make a trip to michigan so I can find an AHU "buried in the field"...

Lol.

cleanspeed1 · 05-17-2011, 10:25 AM

Not bad for the AHU. I just figured the length would be a little closer to what is already in the car.

Christ · 05-17-2011, 10:50 AM

Isn't BMW part of VAG? Makes sense that a 25% larger engine of basically the same design would make around 25% more power.

euromodder · 05-17-2011, 10:57 AM

Quote:

Originally Posted by Christ

Isn't BMW part of VAG?

No, they're independent.

Christ · 05-17-2011, 10:58 AM

Quote:

Originally Posted by euromodder

No, they're independent.

Can't keep track of who's buying who these days...

Plum · 05-18-2011, 03:11 PM

just picked up the book jag that run.

nice thing about the chevy conversion is that they have been done before.

While yes - a 1.9 would secure high mileage, the above gets a few points with me.

my 120 mile commute to work is all country highway, therefore not to concenerned if it is a bit underpowered. If I want power, I have the other car.

I would imagine the 1.9 would have lots of room in there!

Plum · 05-18-2011, 03:25 PM

2002 Jetta TDI with the 1.9 in it comes in at 2970 lbs

1000 lbs differential if I were to go this route - unsure the weight difference in the engines, but one would think the engine is lighter.

cleanspeed1 · 05-18-2011, 04:28 PM

The full dress weight of the TDI comes in at 297 pounds. The engine that you have is 531 pounds, plus the weight of the transmission. So depending on what transmission you run behind the VW unit, you might lighten the car up quite a bit. The 6.2/6.5 weighs about 700 lbs. ( still undercuts the BB Chevy by 40 lbs. ).

The main consideration will be dealing with the electronics. The 6.2/6.5s are by and large mechanical, except for the 6.5 turbodiesel that has the electronic Stanadyne DS4 pump ( these pumps have been maligned because of the location of the PMD. This thing gets hot and causes stalling problems. Move it to a cool location with a PMD relocator kit and all is good. ).

SwamiSalami · 05-18-2011, 10:23 PM

Yes. As I said before 1.9.

I don't understand why I'm the only one being second guessed here.

Christ · 05-18-2011, 10:41 PM

The 1.9 is by and large a stand alone system.

Sure there's wiring, but its only a few sensors and some injector trigger wires. 30 wires, maybe?

You don't even have to tap it into the Jag harness, you can leave the two parts separate from each other.

The AHU only has one engine mount, on the front. A bar could be made to stabilize it across the longitudinal engine bay, or bosses might be found on each side of the motor to mount it.

Big Dave's favorite suggestion is a T56 trans, which has a double over drive ratio. The 1.9 may need a little massaging to pull 62mph @ really low rpms, because it doesn't get into the good boost until 1400+rpm.

I think the target rpm for the 1.9 should be about 1300rpm @55-60mph. With a nice exhaust and intake, and a good tune on the motor, it should be do able.

I look forward to seeing this done.