AAZ or 1Z/AHU ?? - General - VWDiesel.net The IDI, TDI, and mTDI source.

• AAZ or 1Z/AHU ?? by stewardc on 26 Nov, 2006 04:33
• 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.
• #1 by Ziptar on 26 Nov, 2006 05:31
• Differences were discussed a little in this 1.9TD vs. TDI-M Thread
  
  If it were me and, I had the $$$ and access to the stuff.. TDI-M with a Cummins 4BT Pump for sure.
• #2 by stewardc on 27 Nov, 2006 04:23
• Yeah, but there are those that claim they are a slow-revving pig. Comments ??
• #3 by Ziptar on 27 Nov, 2006 10:02
• 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..
• #4 by stewardc on 27 Nov, 2006 12:09
• I have had a 98 Beetle TDI and a 99 Jetta myself and, though they had good power, the rev limit is low.
• #5 by RabbitJockey on 27 Nov, 2006 15:38
• and if its a tdi-m, the rev limit is very different...
• #6 by stewardc on 28 Nov, 2006 03:07
• Bump...any comments on the precombustion chambers as opposed to the weird piston chambers of the TDI???
• #7 by hillfolk'r on 28 Nov, 2006 08:24
• 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
• #8 by stopping on 06 Dec, 2006 17:03
• I guess you are not afraid of electronics eh?
• #9 by stewardc on 07 Dec, 2006 03:26
• 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.
• #10 by burn_your_money on 07 Dec, 2006 04:28
• And the crank, that's a huge differance
• #11 by stewardc on 08 Dec, 2006 17:28
• Quote from: burn_your_money

  And the crank, that's a huge differance

  
  
  Not really. Most AAZs have had the crank fix by now.
• #12 by wolfsburgnut on 08 Dec, 2006 17:40
• 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