Author Topic: swapping 1.6na into later model Jetta or Passat (Read 7872 times)

tadleyjane · « **Reply #15 on:** February 17, 2006, 01:08:51 pm »

Thanks guys! Looks like i should probably swap the tranny along with the motor if i go ahead with the switch.

tylernt · « **Reply #16 on:** February 17, 2006, 01:22:13 pm »

Quote from: "zyewdall"

But now I'm confused. The diesel trannies in there almost all have a higher final drive ratio (meaning higher rpms) than the gas trannies. Shouldn't they have a lower drive ratio to have lower rpms?

It looks like you're right to some extent. It's true the ACN AON ASF and ACLs will have lower rpms thanks to the lower final drive. But if you look at the other gasser trannys, they will all have higher rpms because the low 5th gear more than makes up for the higher final drive. At least, that's what I get if I plug the numbers in to scirocco.org's gear calculator.

If I'm correct, then the ACN, AON, ASF or ASL would actually be an upgrade compared to the diesel trannys, if lowering rpms is your goal (it would hurt acceleration and increase clutch wear though!). But the other gasser trannys are definitely less-than-ideal on a diesel.

I think. :?

zyewdall · « **Reply #17 on:** February 17, 2006, 01:50:29 pm »

Quote from: "tylernt"

If I'm correct, then the ACN, AON, ASF or ASL would actually be an upgrade compared to the diesel trannys, if lowering rpms is your goal (it would hurt acceleration and increase clutch wear though!). But the other gasser trannys are definitely less-than-ideal on a diesel.

I think. :?

Some would be less than ideal, yes, but the worst gas tranny is still not quite as bad as some of the stock trannies that come with the diesels... :roll:

Anyone know what exact cars the ACN/AON/ASF/ASL trannies came in?

And, did VW's ever come with automatics? I know that the old subaru automatics are well despised and reviled (and often replaced with 5 speed manuals) on my other forum, but I haven't even heard mention of a VW automatic. Personally, I can't stand automatics anyway, but I was wondering.

tylernt · « **Reply #18 on:** February 17, 2006, 02:06:48 pm »

A few A1 gassers came equipped with 3-spd automatics, but since these cars were econoboxes targeted at people who like the driving experience, there weren't very many. There were some automatic diesels (if I remember right, my diesel Bentley has a section on the auto trans), but man, I bet there are dangerously slow.

zyewdall · « **Reply #19 on:** February 17, 2006, 05:40:19 pm »

Quote from: "tylernt"

But the ACN AON ASF and ACLs gasser trannys look like the best candidates for a diesel conversion.

Yippie. I just looked at my tranny, and it's an ACN code. Looks like I got one of the best ones for reducing rpm on the highway. With 185/70R13 tires that puts it at 2771 rpm at 70mph in 5th gear. Not bad. Actually a little lower rpm than my truck on the highway -- it's about 2900 at 70mph.

bhtooefr · « **Reply #20 on:** February 17, 2006, 06:56:27 pm »

zyewdall: You're working for VW, selecting the gear ratios for their trannies. You know that you need about 30hp to maintain 70MPH with these cars (this rule applies to A2 and A4s, from the 70MPH = 30hp figure quoted on TDIClub and the fact that A2 TDI swaps get roughly the same MPGs as the cars they came out of). You also know that uphills will demand more power, and being above sea level will reduce available power.

At 2500 RPMs, the NA diesel is producing 33 horsepower at sea level. I've looked into getting a .61 bolt-on 6th gear, and at 70 MPH, that's the RPMs it would be turning. (Actually, my target was 2500 @ 70.) My point is, you've gotta have plenty of reserve power.

They geared the tranny for higher RPMs, believe it or not. The gasser people actually want our trannies. Read that sentence again. THE GASSER PEOPLE WANT OUR TRANNIES.

tylernt · « **Reply #21 on:** February 17, 2006, 07:51:00 pm »

Quote from: "bhtooefr"

At 2500 RPMs, the NA diesel is producing 33 horsepower at sea level.

Say, if you know the HP our little N/A 1.6D is making at 2500rpm, maybe you have the torque/HP curves for the whole RPM range... and if so, would you be willing to share them with us?

zyewdall · « **Reply #22 on:** February 17, 2006, 08:56:58 pm »

Quote from: "tylernt"

Quote from: "bhtooefr"
At 2500 RPMs, the NA diesel is producing 33 horsepower at sea level.
Say, if you know the HP our little N/A 1.6D is making at 2500rpm, maybe you have the torque/HP curves for the whole RPM range... and if so, would you be willing to share them with us?

I've seen them on this forum before somewhere. Maybe someone can remember and post a link.

So, if the gassers want the diesel trannies, and the gasser trannies have higher gearing for the diesels, why don't we just swap...

bhtooefr · « **Reply #23 on:** February 17, 2006, 09:16:22 pm »

From 4Crawler.