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General Information => General => Topic started by: stewardc on November 26, 2006, 04:33:17 am

Title: AAZ or 1Z/AHU ??
Post by: stewardc on November 26, 2006, 04:33:17 am

Hi, all. I presently have a 1.6 TD in my Caddy and the bottom end is slightly farugelahed, so I need to upgrade to a 1.9. I'm havine real problems deciding. What I'm wondering, is what are the pros/cons of an indirect injection diesel versus a direct injection diesel.  Is the IDI head with the precombustion chambers more problemous when boost is raised, etc. The truck will be mainly street driven with the occasional blast to impress the rednecks and Honduh drivers and will have a 367 bolted gear with a .71 5th and a Quaife LSD.

Title: AAZ or 1Z/AHU ??
Post by: Ziptar on November 26, 2006, 05:31:37 am

Differences were discussed a little in this 1.9TD vs. TDI-M Thread (http://www.vwdiesel.net/phpBB/viewtopic.php?t=5322)

If it were me and, I had the $$$ and access to the stuff.. TDI-M with a Cummins 4BT Pump for sure.

Title: AAZ or 1Z/AHU ??
Post by: stewardc on November 27, 2006, 04:23:55 am

Yeah, but there are those that claim they are a slow-revving pig. Comments ??

Title: AAZ or 1Z/AHU ??
Post by: Ziptar on November 27, 2006, 10:02:22 am

Quote from: stewardc

Yeah, but there are those that claim they are a slow-revving pig. Comments ??

I have owned a 98 and an 03 TDI(Electronic) and have racked up just shy of 400K miles between the two.

One thing I can say for sure the TDI ain't....

That's a slow-revving pig..

Title: AAZ or 1Z/AHU ??
Post by: stewardc on November 27, 2006, 12:09:31 pm

I have had a 98 Beetle TDI and a 99 Jetta myself and, though they had good power, the rev limit is low.

Title: AAZ or 1Z/AHU ??
Post by: RabbitJockey on November 27, 2006, 03:38:12 pm

and if its a tdi-m, the rev limit is very different...

Title: AAZ or 1Z/AHU ??
Post by: stewardc on November 28, 2006, 03:07:30 am

Bump...any comments on the precombustion chambers as opposed to the weird piston chambers of the TDI???

Title: AAZ or 1Z/AHU ??
Post by: hillfolk'r on November 28, 2006, 08:24:53 am

i have an ahu tdi
my "slow revving pig" still cuts low 14's right off the street,no problem
id do a tdi instead for the sick torque increase

Title: AAZ or 1Z/AHU ??
Post by: stopping on December 06, 2006, 05:03:46 pm

I guess you are not afraid of electronics eh?

Title: AAZ or 1Z/AHU ??
Post by: stewardc on December 07, 2006, 03:26:11 am

Quote from: stopping

I guess you are not afraid of electronics eh?

Who, me? There are no electronics on either engine that I mentioned. I think the only real significant differences are the head and pistons, but I may be wrong.

Title: AAZ or 1Z/AHU ??
Post by: burn_your_money on December 07, 2006, 04:28:10 am

And the crank, that's a huge differance

Title: AAZ or 1Z/AHU ??
Post by: stewardc on December 08, 2006, 05:28:01 pm

Quote from: burn_your_money

And the crank, that's a huge differance

Not really. Most AAZs have had the crank fix by now.

Title: AAZ or 1Z/AHU ??
Post by: wolfsburgnut on December 08, 2006, 05:40:02 pm

I wouldn't say most have. I have yet to see one around here have the crank fix, and there a quite a few AAZs in this area.

Peter