'90 Coupe Quattro - '15 S8 4.0t Swap

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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby 90quattrocoupe » Wed Jul 25, 2018 11:22 pm

Am I assuming you are going to cut and splice the axles? Doesn't the outer CV of the later axle have the same internal splines as the stock coupe?

On the radiator, you should make it a triple pass now and not wait. Your V8 motor puts out more heat than my 99 S8 motor and I ended up with a triple pass radiator. When you put a V8 in a coupe, you are basically putting a wall behind the radiator. So the air goes through the radiator and hits a wall. Not good for air flow. It took me almost a year to get my cooling down where I wanted it. It all changed the day I installed a triple pass radiator. Same fans, same shrouding and same thermo-switches. Only difference was installing a triple pass.

Like air, water takes the path of least resistance. When you use a front mount single pass radiator, you do not have even flow across the radiator. The pressure across the core is not the same. Some areas will move faster than others giving you uneven flow and uneven cooling.

My radiator is the exact size as the B4 radiator, as far as height and length goes. It is a little thicker as the dual cores used were a little thicker. Mine bolts in the car using B4 stock mounts. My radiator is lot smaller than your and thinner. My fans are set on a 93 degree switch and the thermostat is 85 degrees. If I am driving in any weather that is less than 80 degrees outside the fans never even come on.

Greg W.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby varia » Wed Jul 25, 2018 11:47 pm

you can use B3 and B4 FWD manual axle as well, they are the thickest from that era
¯\_(ツ)_/¯

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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Thu Jul 26, 2018 12:06 am

No the stock coupe bearing cage and housing is significantly smaller and presumably weaker than the b7. Hence the knuckle clearancing. The internal splines are also significantly larger than the coupe parts. I’m not going to mess around with trying to keep factory parts, I’ll make the larger parts work. Will be getting custom shafts done by a company I’ve used before. They can make any shaft needed to make it all butter together like factory.

Radiator needs a bleed port welded in so maybe we’ll put some plates in the tanks then for triple pass!
'00 a4 Avant - VR6 Turbo 6766 - 812whp - 10.201@143.35
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Thu Aug 02, 2018 9:43 pm

So got the transmission mounts and modified shifter rods sorted and a B7 shifter box in the car (with sound deadening for stealth).

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And I think I'm going to make custom hub knuckles all the way around to accept the a8/s8 wheel bearing and hub so I can run these trusty outer CV's... so that will essentially give me unbreakable axles (100% s8) all the way around.

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Next up is making the knuckles and making rear diff mounts for the b7 rear diff.... then measuring axle lengths and getting bars cut.
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby audifreakjim » Fri Aug 03, 2018 12:00 pm

You had me at knuckle. Are you planning on dropping the ball joint mount at all?
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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby Haenszel » Fri Aug 03, 2018 12:32 pm

audifreakjim wrote:You had me at knuckle. Are you planning on dropping the ball joint mount at all?


That could be very easily done, what's the benefit on these cars? To keep arm angle at the correct angle when lowering?

What's the usual drop?


Also, the mail just came today and..... somebody sent me free RocEuro intake tubes!! They need some minor modification to fit, but they’re definitely gonna work so that’s awesome. Thanks Ahmad!!

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Re: '90 Coupe Quattro - '15 S8 4.0t Swap

Postby audifreakjim » Fri Aug 03, 2018 7:25 pm

A few of us have played with dropping them around 1.5". I got major torque steer and went back to stock, but the idea is to get the arms pointing down again so you don't loose camber in the corners.. You should address the tie rods at the same time so you don't end up with crazy different angles.
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