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ahu vs 1.9idi
by
1life2live
on 23 May, 2012 11:55
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I currently have a 1984 jetta with a 1.6td with the fuel turned up and the boost set to 20psi. I was planning to swap in a tdi out of a 97 jetta that i bought as a complete running car. I have just been offered a 1.9 idi with only 40k on the clock with the reciepts showing when it was installed. Im now looking for advice on the best direction to go whether i take the time to swap in the tdi or go the easy route and bolt in the 1.9. Is there a big power difference between the two? What are the pros and cons between the two engines and is it worth the extra time and hassle to do the tdi swap. I had plans of bigger injectors and a chip on the tdi but i could spend that money on modding the pump on the 1.9. Any help would be great
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#1
by
libbydiesel
on 23 May, 2012 13:25
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The AAZ and AHU/1Z will make similar power provided they are both intercooled, similar turbo efficiency, etc. The TDI does not like to rev as high, is about 10-15% more fuel efficient and cannot drop pre-chambers.
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#2
by
CRSMP5
on 23 May, 2012 15:05
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crazyandy did some math for me... my tdi-m is pullin aprox 6200rpm... at that point no more pull.. stock 98 02a, 3rd gear 78mph via gps.. 21psi of boost on the stock pea shooter tdi turbo too....
imo biggest differance.. no pre cup to drop.. no glow plugs required unless sub 20*f too.. but i have yet to drive a aaz to see how it feels vs my tdi-m..
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#3
by
1life2live
on 23 May, 2012 17:02
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What exactly is the pre chambers? I plan on inter-cooling either motor and would like to do some mods to either of them. I know it will be easier to do the aaz since I won't be dealing with the computer and I also won't have to worry about the egr. Something about being able to tune the ecu on the ahu is tempting to do the extra work.
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#4
by
CRSMP5
on 23 May, 2012 17:19
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prechamber is the swirl chamber the injector/glow plug go into on a idi head.. for somereason some fall out as you drive and kill what was a good engine..
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#5
by
1life2live
on 23 May, 2012 21:30
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Ok that's what I thought u were talking about. My friend had that very thing happen to him after a machine shop resurfaced his head and removed them. They didn't stay in after they re installed them and trashed the motor.
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#6
by
nathan_b
on 24 May, 2012 09:58
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crazyandy did some math for me... my tdi-m is pullin aprox 6200rpm... at that point no more pull.. stock 98 02a, 3rd gear 78mph via gps.. 21psi of boost on the stock pea shooter tdi turbo too....
imo biggest differance.. no pre cup to drop.. no glow plugs required unless sub 20*f too.. but i have yet to drive a aaz to see how it feels vs my tdi-m..
I've driven a couple aaz mk3s and they are DOGS compared to the ahu.
No way ahu/aaz make similar power in my book.
Plus, ahu is less smokey, and easier to find parts for.
Egts are wayy cooler too.
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#7
by
libbydiesel
on 24 May, 2012 10:36
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When stating that they will produce similar power, I wasn't talking about stock form. In stock form the AAZ was one of the most de-tuned piles of steaming dog poop that VW ever produced, rivaled only by the 1.6ECOdiesel.
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#8
by
8v-of-fury
on 26 May, 2012 21:23
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1.9 AAZ 105-7tq stock compared to the 1.9 AHU 150tq stock. Stock the AHU would be way quicker, not to mention the always spooled k03 hitting max torque at 18-1900 rpm.
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#9
by
CdnVWJunkie
on 02 Jun, 2012 16:04
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1.9 AAZ 105-7tq stock compared to the 1.9 AHU 150tq stock. Stock the AHU would be way quicker, not to mention the always spooled k03 hitting max torque at 18-1900 rpm.
Pretty sure stock tq on the aaz is more like 120 not 105.
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#10
by
8v-of-fury
on 03 Jun, 2012 11:23
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I looked it up, 1.6TD was rated at 69 HP @ 4500 RPM and 98 ft.lbs. @ 2500 RPM. The 1.9TD (AAZ) was rated at 75 HP @ 4500 RPM and 114 ft.lbs. at 2500 RPM.
Right in between the both of our guesses.
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#11
by
8v-of-fury
on 03 Jun, 2012 11:24
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Even if the AAZ and AHU made the same torque rating, the fact that the AHU makes it at 1800 as compared to 2500 is what you are going to feel while driving it.
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#12
by
libbydiesel
on 03 Jun, 2012 11:34
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Add an intercooler (like the AHU has) and appropriate boost fuel enrichment (like the AHU has) and the AAZ will produce similar power/torque to the AHU. It will produce it somewhat later in the RPMs, will be comfortable revving higher and will consume 10-15% more fuel in the process.
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#13
by
Henk
on 03 Jun, 2012 14:44
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or get an AHU and add a decent FMIC, more fuel, more boost and get even more power again, for probably very little drop in economy
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#14
by
homerj1
on 03 Jun, 2012 15:19
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BUT the 1.9idi is basically 1 wire to run engine.
VS The sensor-laden electronic TDI
I've had both, love the simplicity of the iDI, but have found the ahu with 205 nozzles tdi to have more power - as I ignore the CHECK ENGINE light as accelerating...
Although I lean to the simplicity of the IDI