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> Sasquatch Part III Audi 1.8t transplant..., New battery switch finally...
Chris H.
post Jul 7 2017, 10:55 AM
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That's an older post on the limp mode thing.

So just to hijack for a minute...How much firewall cutting is required to put a 1.8T in? I'm liking the 6 speed bolt-up idea.
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Andyrew
post Jul 7 2017, 11:35 AM
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QUOTE(Chris H. @ Jul 7 2017, 09:55 AM) *

That's an older post on the limp mode thing.

So just to hijack for a minute...How much firewall cutting is required to put a 1.8T in? I'm liking the 6 speed bolt-up idea.


Depends on how far back you put the engine/trans. There is physically enough room to put the engine/trans in the engine bay without any cutting but you have to line up the axles with the trailing arm stub axles. if you dont want the transmission flanges to walk out of the transmission.

Brad roberts thinks that is necessary and thinks you can get away with using some material to space out the flange C pin so it retains better as thats what they are doing on the boxster/ cayman cup cars.


Personally I moved mine back about 6" (or I will). Not going to miss the space as it comes from the smallest part of the trunk. The shock towers will make the starting point for the trunk. Targa top still fits, but it will be difficult to make it work well. The rear coolant flange is the rear most item there. If you built a custom flange you could gain probably 1.5" of space. Personally I like a lot of room.


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Chris H.
post Jul 7 2017, 02:06 PM
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Very interesting...thanks.
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Mike Bellis
post Jul 7 2017, 02:40 PM
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Mine is moved back to where you see Andyrew's bar. My targa top still fits in the trunk too. The 6 speed is longer, invading the stock muffler space. The 5 speed has 3-4 more inches of space.
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Mike Bellis
post Jul 7 2017, 02:48 PM
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QUOTE(Nocturnal_breed @ Jul 7 2017, 04:16 AM) *

Mike,

You've talked me into it. I've been reading this build thread since the beginning. So I have a chassis and I've been looking for the right swap, now I have it. Just picked up an Audi 1.8t donor car. The problem is that mine is a 01 a4 Quattro. I can't use the transmission like you did initially. I saw that you bought a 05 -08 boxster s 6 speed and as much as I'd like to do that now I want to put a 5 speed in to get it up and running. The only question that I'm not sure about is are all the 5 speed boxster transmissions a direct bolt up or are there only certain years that will work. From what I see on here they should all bolt up. It is really like to verify that before I buy a transmission that I can't use. Any help would be greatly appreciated. Love the build!

I Agree with Andyrew, buy a Passat tranny. They are almost the same tranny. Gear ratios are the main difference. The Passat tranny is cheap. If you had a torquey motor, I would recommen the 5 speed LUK TDI version from Europe. A 6 speed in good condition will run you around $2,500 minimum in the US. I got real lucky on mine but is does have a noisy main shaft bearing. One of these days I will send it to Dr. Evil. If you do go the 6 speed route, just remember, do not buy the tranny with the circular bell housing. You need the one that looks like the Audi/VW bell housing. All Boxster, Passat and Audi 5 speed trannies have this correct bell housing. The Boxster 6 speed has 2 variants.
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Porschef
post Jul 7 2017, 04:01 PM
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Interesting info, would that extra 3-4" allow for installation without cutting the trunk?

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Mike Bellis
post Jul 7 2017, 04:29 PM
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QUOTE(Porschef @ Jul 7 2017, 03:01 PM) *

Interesting info, would that extra 3-4" allow for installation without cutting the trunk?

The extra 3-4" is on the tail of the tranny. Trunk firewall needs to be moved to clear the valve cover and align the axles. In my case, I also run the intercooler piping in this space too.

The axle center line of the tranny is closer to the motor than on a 901. You need to move everything back close to center with the trailing arm stubs.
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Mike Bellis
post Jul 7 2017, 04:34 PM
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Page 3 or 4 of this thread has a side by side of the trannies with the axle locations centered on each other.You will see the longer ball housing of the 901.
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Porschef
post Jul 7 2017, 04:37 PM
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Gotcha. Had I been more diligent in reading Andy's post I wouldn't have been asking that question... (IMG:style_emoticons/default/dry.gif)

It's been a while since you've done the conversion, do you prefer it to the rotary from a driving/handling standpoint?

Thanks Mike
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Mike Bellis
post Jul 7 2017, 04:47 PM
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My car can be driven like a stock VW or Audi when not in the boost. An everyday car. Once in boost it fuching awesome and really comes alive.

I've had 3 different renditions of rotary engines. They are fun, fast, loud but lack torque. I always had to use 1st gear on the 901 with a rotary. Hated it!

The newer tranny technology is so much better. That is half the fun on the car. If I had to drive the 1.8t in front of a 901, that would totally suck. It just can't be shifted fast or smooth enough to keep the boost up.

The Boxster shifter parts are far superior to the rod as well.

Overall I love the 1.8t. It's a great motor. The Bosch Motronic 7.5 and drive by wire are awesome.

Andyrew has more power potential and that's OK. This build wasn't about maximum power. I blew up so many motors, I just got tired of it. When I saw JRust's car with the previous owner drive from Idaho to Monterrey... I knew I needed a motor that reliable. So the build is about good HP (325 @ 20psi) and reliability. The car is awesome on the street and fast as fuch on the track. I was looking for a Subaru when I stumbled on the 1.8t. All the Subaru's I found were junk needed a rebuild.
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Porschef
post Jul 7 2017, 05:26 PM
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My curiosity is piqued because I have a shot at a 1.8 Passat engine & tranny. I should just slap myself upside the head as I don't have a smidgen of the fab skills you've got.

But, I guess I can dream... (IMG:style_emoticons/default/blink.gif)

Great stuff Mike, thanks for sharing.
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AZBanks
post Oct 27 2017, 07:27 PM
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I just read through the whole thread. Awesome work on everything except one small detail. All these amazing fabrication projects and you are using angle bracket as a battery hold down????? This car needs something better.

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Mike Bellis
post Oct 27 2017, 08:36 PM
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QUOTE(AZBanks @ Oct 27 2017, 06:27 PM) *

I just read through the whole thread. Awesome work on everything except one small detail. All these amazing fabrication projects and you are using angle bracket as a battery hold down????? This car needs something better.

You're right. It's original to the car when I bought it. It's just so low on the list and it works great, I never changed it. I've been waiting for the battery to fail for the last few years. It just won't die. I'm sure I just jinxed myself...
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Mueller
post Oct 27 2017, 08:38 PM
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QUOTE(Mike Bellis @ Oct 27 2017, 07:36 PM) *

QUOTE(AZBanks @ Oct 27 2017, 06:27 PM) *

I just read through the whole thread. Awesome work on everything except one small detail. All these amazing fabrication projects and you are using angle bracket as a battery hold down????? This car needs something better.

You're right. It's original to the car when I bought it. It's just so low on the list and it works great, I never changed it. I've been waiting for the battery to fail for the last few years. It just won't die. I'm sure I just jinxed myself...



If Mike gave me some dimensions I'd gladly make him an aluminum hold down for it to replace the angle iron (IMG:style_emoticons/default/smile.gif)
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Mike Bellis
post Oct 27 2017, 08:42 PM
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QUOTE(Mueller @ Oct 27 2017, 07:38 PM) *


If Mike gave me some dimensions I'd gladly make him an aluminum hold down for it to replace the angle iron (IMG:style_emoticons/default/smile.gif)

yey big by yonder short.
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