3B swapped Audi 90

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3B swapped Audi 90

Postby JH87 » Wed Dec 21, 2022 1:59 am

Back story:

In spring of 2020, I purchased an unfinished 3B swapped 1994 Audi 90Q. While still living in Wyoming, I tore the car apart, fixed many things, put it back together. A brief list: VEMS optioned for AAN with the LS coils, billet wheel k24-7400 turbo, Wagner evo intercooler, Bosch 550CC injectors and 044 pump, LWFW and uprated clutch/pressure plate, JHM shifter and bolted up to an 01A (I know, it’s sacrilege), light engine machine work & fresh bearings on the bottom end and ARP bolts and studs throughout, 5-lug, UrS brakes. It runs beautifully. That said, the previous owner cut up the fenders and quarters for wheel fitment, the paint color is not to my taste and the clear is trashed anyways. Various interior and exterior molding was damaged or improperly installed, seats are not great, some shoddy wiring, missing parts/pieces that are impossible to find… the usual we all have come to expect from most of the Audi 90’s on the various online marketplaces. To the previous owner’s credit, the 5-lug swap was done well, he sourced 99% of the parts which made my life easy, and he spent a pretty penny on some very nice parts. My belief is the project got expensive he and just threw the car together good enough to get it sold.. fine by me, it was a steal despite the work I needed to do.

After it was all said and done, I loaded it on a trailer and moved it to California.

Now for the good part. I have finally found a unicorn low mileage body! I plan to dismantle the dilapidated 90Q and swap my 3B and quattro system over to the mint 90S. The dismantled 90Q will be parted out and eventually scrapped (and probably shipped to China to be made into lawn furniture). The goal is to keep the mint 90 styling as OEM (as possible) except for wheels and converting from FWD V6 to 20 valve I5 turbo quattro. Under the hood and inside the car, I want the creature comforts of a semi-modern car, such as AC and power steering. Neither of which I’ve had with the beater body. I also like the feel of the stock suspension because Southern California roads are worse for wear and coilovers don’t absorb impact loads in the same manner that big, tall springs on heavy duty struts do. Which is why I’m sadly selling my BC Coilovers. Those coilovers have exceeded my expectations and would certainly suit a more track ready car. Again, goal here is a fun yet comfortable streetcar that’s not hard to look at. One new development is to run 3.70 final drive instead of the 3.889. I feel like that would balance the car really well for my uses. I have also sourced an authentic Wagner evo exhaust manifold and the garret GT3071 BB turbo with all other supporting items. Later, I’d like to upgrade engine internals but for now, I’ll just run a conservative 91 tune.

I have a list going for what I need to buy and sell (if interested to see the list, pm your email to me and I’ll send it in a word doc). This will also be posted in the classified area once I have the parts pulled and tagged. This is going to be my second I5 swap and probably 20th time removing/installing an Audi engine. So, I’m not green but I’m no expert either. I’m sure I will have questions and concerns along the way. I have hit a wall for sourcing the AC parts, so if anyone has a line on those items, man you’d be doing me a big favor. Over the years I have acquired some additional and unneeded parts like a 3B block and head. I bought those for parts only and they definitely need to spend some time at the machine shop if anyone has intent to use them.

I have added some pictures to show the work I’ve done to this point.
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‘21 VW ID.4 *daily
‘08 335xi 6MT/N54 480hp *wife’s
‘94 3B 90Q soon to be ‘93 *labor of love
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Re: 3B swapped Audi 90

Postby JH87 » Fri Dec 23, 2022 1:47 pm

I was doing some reading/searching because I’m trying to determine if I want to spend the money for rods, pistons and head work while I have the engine out. Regardless of whether I have head worked or install performance pistons, I will be installing new, more robust connecting rods for added piece of mind. I still haven’t made a decision on if pistons are necessary. What is the general consensus for safe hp numbers with stock pistons? I’ve seen multiple stated figures. Going off what people say, 400 whp should be okay, but have not seen any data other than anecdotal experience. Does anyone have long term experience running the aforementioned hp? If so, has your engine been apart after running that power over an extended period? Did the pistons appear to be stressed beyond normal wear and tear? Was cylinder wall and piston skirt wear uniform?

I also came across an interesting read about cylinder head flow data. I was wondering if anyone has any data they could share regarding their experience with oversized valves, or back-cut OEM valves, or 3-angle, or port polishing, or high rate springs etc.. the gist I got from the motorgeek post is that back cut OEM valves and surface polishing yield decent results for flow and anything more would be marginally better, and in some cases worse. Although my hp goals are modest, cylinder head flow is important, regardless. To what level of head modification is necessary, if any? That is the real question. Any unbiased un-opinionated advice on this matter is welcome.

https://www.motorgeek.com/threads/20vt- ... ata.51871/
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‘08 335xi 6MT/N54 480hp *wife’s
‘94 3B 90Q soon to be ‘93 *labor of love
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Re: 3B swapped Audi 90

Postby vt10vt » Tue Dec 27, 2022 9:19 pm

So the pearl one is the 90s right? Is that blue one the beater?

Unless you're definitely going way bigger than a 7400 you'll be fine with just rods. Pistons are fine for 450-500whp easy with a good tune, I'd talk to Marc Swanson at EFI Express for anything over that (also for your tuning needs). 7A or other cams will be helpful way before head work is worth the investment.

Sweet project and keep the thread updated, especially with pics of the quattro swap!
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2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
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Re: 3B swapped Audi 90

Postby JH87 » Wed Dec 28, 2022 1:34 am

vt10vt wrote:So the pearl one is the 90s right? Is that blue one the beater?

Unless you're definitely going way bigger than a 7400 you'll be fine with just rods. Pistons are fine for 450-500whp easy with a good tune, I'd talk to Marc Swanson at EFI Express for anything over that (also for your tuning needs). 7A or other cams will be helpful way before head work is worth the investment.

Sweet project and keep the thread updated, especially with pics of the quattro swap!

Yep, pearl white one is pretty mint and the blue one is far from it.

Thanks for the info, I definitely plan to pick up some 7A profile cams and once I get my 7400 sold, I’ll be getting a set of rods.

So far the Quattro swap appears to be straightforward. All the mounting holes line up from one car vs the other. One item of note is to take the fuel lines from the Quattro and swap them as well. The two different fuel tanks terminate at different locations under the car.


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Re: 3B swapped Audi 90

Postby JH87 » Wed Dec 28, 2022 1:36 am

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Here’s another shot of the white one!


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Re: 3B swapped Audi 90

Postby JH87 » Wed Dec 28, 2022 1:54 am

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Oddly enough, it has cloth interior.
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Also at the very early stages of yanking this V6 out.

It’s hard to have two cars in pieces in my small 2-car garage but I’m almost done stripping the blue one down. Spitballing here but wondering if the blue one should go to scrap or if I should donate the shell to someone who might make use of it (free with the stipulation that you haul it away). Don’t really know the logistics for that to happen but it will need to happen quickly once I’m done stripping my stuff from it. I’m hoping to have that space on the other side of my garage back in the coming weeks. So if anyone is interested in a structurally sound chassis, I live in Southern California. Otherwise, it’s probably just going to scrap. More photos to follow.


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Re: 3B swapped Audi 90

Postby varia » Fri Dec 30, 2022 10:46 am

those flares..... super cool!!!

What are those off?
¯\_(ツ)_/¯

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Re: 3B swapped Audi 90

Postby JH87 » Fri Dec 30, 2022 10:57 am

varia wrote:those flares..... super cool!!!

What are those off?

They were already on the car when I bought it but IIRC, I think they were from eBay and I think they’re actually for an e36.


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Re: 3B swapped Audi 90

Postby JH87 » Fri Dec 30, 2022 3:47 pm

I have the blue car fully stripped!
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Re: 3B swapped Audi 90

Postby JH87 » Sat Dec 31, 2022 4:35 am

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Took some time to sort everything before I start the swap.


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Re: 3B swapped Audi 90

Postby JH87 » Sat Dec 31, 2022 2:42 pm

Not sure if anyone nerds out about this stuff but I sure do:
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Re: 3B swapped Audi 90

Postby JH87 » Wed Jan 04, 2023 5:46 pm

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Sent to the wrecker


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Re: 3B swapped Audi 90

Postby JH87 » Mon Jan 09, 2023 1:14 am

I removed the FWD junk from the rear of the car and got the Quattro items mounted today. fuel tank, rear sub-frame, spindles, suspension and brakes. The fuel tank was the worst part. For anyone doing a Quattro swap, you will need to remove all the studs that hold the brake line and ABS sensor wire on the passenger side. Also, the rearmost bolt holes for the sub-frame are covered with undercoating. I was able scrape the undercoating off pretty easily. The frontmost rear sub-frame bolt holes utilize the same mounting location as the torsion beam that was originally there.
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Re: 3B swapped Audi 90

Postby themagellan » Mon Jan 09, 2023 10:25 am

Nice, way to go with all that progress - :thumbsup: on the efficient use of garage space

cool dog :thumbsup:
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Re: 3B swapped Audi 90

Postby JH87 » Mon Jan 09, 2023 5:26 pm

themagellan wrote:Nice, way to go with all that progress - :thumbsup: on the efficient use of garage space

cool dog :thumbsup:

Thanks, it’s going pretty smoothly. Just taking my time and being careful with everything.

yeah you have to get creative sometimes. I went from having a 3 car with a shop in my back yard to a 2 car with no yard but I manage.

He’s a good dog. He’s been keeping the seats warm for me.


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Re: 3B swapped Audi 90

Postby JH87 » Sat Jan 14, 2023 11:11 pm

I put the rear wheels on to see how close everything is and now I know why the previous owner cut the fenders. Going to see if I can get some wheels with less offset: perhaps OEM wheels from a 200???. Also, I think the rear hubs are B5 A4 hubs if I’m remembering correctly. Any suggestions to get me more flush?Image
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Re: 3B swapped Audi 90

Postby JH87 » Mon Jan 16, 2023 11:19 pm

Pulled the V6 out today.Image
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Re: 3B swapped Audi 90

Postby rennenmsports » Tue Jan 17, 2023 7:21 pm

Nice choice!
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Re: 3B swapped Audi 90

Postby JH87 » Tue Jan 24, 2023 7:51 pm

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My CSF radiator showed up. A lot better quality than the eBay special I was using. Also working on getting my manual steering rack set up. Going to forego having power steering since every power steering system is prone to leaks. The manual rack really isn’t too bad to steer during parking either.


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Re: 3B swapped Audi 90

Postby JH87 » Fri Jan 27, 2023 11:54 pm

Lots done lots to do. On the Quattro swap topic, the forward carrier on the rear differential is not as plug and play as the sub frame was. I was able to use some solid aluminum stock, cut it to size, drill holes and then reinforce the sheet metal under the rear seat. This gave me a mounting location for the carrier on the driver’s side. For the passenger side, the mount terminates in front of the rear seat into much heavier sheet metal. I drilled a hole, used a structural washer and nut to fasten the bold. It appears super strong and the rubber bushing mount will mitigate shock loads on that support… so I’m satisfied with the rear end. Still waiting on lots of parts to show up in the mail so I can tackle the front half. Also replacing all seals and axles since I have it all taken apart and don’t really want to take it apart again for awhile. Lots of routine maintenance underway.Image
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