[Vwdiesel] Can 91 VW Jetta Engine with TDI be put in 88 gassy?

[Tony and Lillie]

As Dave stated, it is a good idea. In fact, turbo cars like as big of exhaust (or no exhaust, if you don't mind the noise) as you can give them. This allows for faster spooling of the turbo, which translates to less turbo lag. Also, ultimately, at higher revs, a smaller exhaust will limit the maximum boost because of the volume of exhaust being ixpelled from the engine relative to the restriction of the pipe size.

BTW, this is not at all true of an NA engine, where too much surface area translates into low opperating pipe temperatures and reflective pulsing (excessive back-pressure). So, by going too big on an NA engine, you actually increase backpressure.

HTH,
Tony

-----Original Message-----
>From: Dave Cook <davevw at yahoo.com>
>Sent: Nov 3, 2009 9:03 AM
>To: VW Diesel Group <vwdiesel at vwfans.com>
>Subject: Re: [Vwdiesel] Can 91 VW Jetta Engine with TDI be put in 88 gassy?
>
>It would be a good idea to swap the exhaust.  It was likely upgraded with a larger exhaust.  To a point, bigger is better on the TD cars' exhaust, and I would assume that it follows the same path from front to back on both cars so it shouldn't be too hard unless it was all welded together.
>
>In that case, it might be worthwhile to just have a pipe welded in on the converted car once you are done.  
>
>Dave Cook
>
>
>--- On Sun, 11/1/09, Jim Kvarnberg <jimkvg at 3web.com> wrote:
>
>> From: Jim Kvarnberg <jimkvg at 3web.com>
>> Subject: Re: [Vwdiesel] Can 91 VW Jetta Engine with TDI be put in 88 gassy?
>> To: vwdiesel at vwfans.com
>> Date: Sunday, November 1, 2009, 3:35 PM
>> Jim Kvarnberg wrote:
>> > My 91 VW Jetta TDI failed insurance inspection because
>> of severe 
>> > structural rust problem along the right side.  I
>> have a good gassy 88 
>> > VW Jetta, but its automatic transmission is
>> shot.  The 91 Jetta has 
>> > five speed transmission.  Here is what I am
>> thinking ... pull the gas 
>> > engine with tranny out of the 88 and the engine TDI
>> with manual tranny 
>> > out of the 91 to put it in the 88.  May I hear
>> your feedback or, if 
>> > any, instruction/suggestions on this?  Is this
>> idea feasible?  Thank 
>> > you in advance.  Jim
>> Roger wrote:
>> I doubt the '91 is a TDI unless it has been swapped, like a
>> 1.6TD 
>> (indirect injection).. If so, both vehicles should be based
>> on the A2 
>> platform and the swap would be pretty straight
>> forward.  Only issues 
>> would be adding the pedal for the manual clutch.
>> 
>> Bryan wrote: Yes, you can pull the 1.6td eco diesel or td
>> and 5 speed to 
>> put in the 88 Jetta, both A2, will fit fine.
>> 
>> Thank you Roger and Bryan for response to my
>> question.  I stand correct 
>> re:  TDI  Yes it is not TDI.  It is
>> TD.  I was confused because the guy 
>> who sold me the 91 car mentioned TDI.  Maybe I
>> misunderstood him.  
>> Anyway, ... me still learning ... an old dog struggling to
>> learn new 
>> trick!  I'm 66 and TD thing is just new to me. 
>> Now re: swapping engine 
>> and other parts around. I just noticed that the exhaust
>> pipe is a bit 
>> bigger in a TD car than that in a gassy car.  Should
>> they also be 
>> swapped?   Yes I am aware that the whole
>> idea is a huge job! :-)   Jim
>> 
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>
>
>      
>
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