v8 into b3 coupe

[sam80quattro]

ive tried the search and not found the answers i need...
a friend is after a v8 in his 2.8v6 coupe quattro and were trying to find out whats what before he goes and buys an a8/s8..

so are the s8 motors different in size to an a8 4.2? do they both mount the same?

can abs and brake master cylinder be left in situe?

im assuming the stock 2.8 clutch will cope ok? its not going to be a drag or even track car just a weekend blaster sort of thing.

can the a8/s8 ecu be altered so that it runs correctly without the autobox? i understand the crank position sensor needs a hole drilled in the box to fit or moved to the front...

got a welder and not put off by making engine mounts etc... i think we'll be doing the same as wab and mounting the engine to the subframe.. im assuming the standard oil cooler/filter setup can be kept when doing it that way??

finally... is there anything i may have totally overlooked lol

[caterpillar]

http://www.s2forum.com/forum/showthread.php?t=60164 seen this??

[djh]

have a look at threads by kieron20v (think thats his sign in) or wab the king.

[sam80quattro]

i did i had considered posting in there but didn't want to take anything away from shone190's thread or take it off topic regarding b2 and b3/4..

[Tonks4x4]

My 1985 80 2 Door quattro with 4.2 V8 BNS B7 RS4 engine



B3 is virtually the same space to work with

[sam80quattro]

have a look at threads by kieron20v (think thats his sign in) or wab the king.

only thing is everyone seems to avoid using the oem ecu.. is this a tuning issue or immo and the lack of communication with the autobox?

[sam80quattro]

My 1985 80 2 Door quattro with 4.2 V8 BNS B7 RS4 engine



B3 is virtually the same space to work with

thats awesome.. are you using standard management?

[Tonks4x4]

Yes

[Matas]

Is your dash working? What have you done to show rpm's on the dash? Any interfacing done?

[Kieron20V]

You can buy Ann immo and autobox delete chip from 034 to keep factory ecu, im sure someone this side of the pond has figured it out too. I seem to recall seeing a website a wjile back that was dedicated to fitting Audi v8s into kit cars.

[andy10v]

You also need either a manual flywheel from an S8, or the 034 auto flexplate adapter.

Most people seem to relocate the oil filter due to the engine mount.

Sienna currently posts as Nollywood on Motorgeek, and has a pile of wiring diagrams. He is currently putting a v8 in an a4, I think he has deleted a lot of info from the old Sienna v8>a4 threads on motorgeek, dont know about here, worth a search first.

034 do the chip for the a8 ABZ to let the auto engine run without the autobox, and can also do an immobilizer defeat. PRJ might do it? He was doing things to an earlier v8 ecu.

I understand S8 ecus can be coded in vag com to run as auto or manual, but the abz cannot as it was never available as a manual.

Need to clearance the subframe or oilpan or both I beleive.

Some interesting ABZ ecu info here if you sift through the crap (regarding putting an abz into a fiero but using the factory audi ecu)

http://www.motorgeek.com/viewtopic.php?f=10&t=47971&hilit=abz

ABZ into an a4 on stock ecu

http://www.motorgeek.com/viewtopic.php?f=6&t=45643&hilit=abz

ABZ cq, on vems, but good fitting info

http://www.motorgeek.com/viewtopic.php?f=6&t=15546&start=1300

Marc's V8 twin turbo coupe, vems and turbos, but some of the engine fitting may be of interest

http://www.motorgeek.com/viewtopic.php?f=6&t=5573&start=100

ABZ 91 80q vems

https://www.motorgeek.com/viewtopic.php?f=6&t=46627

I quite fancy doing one, given the price of a b3/4 quattro and an a8, what puts me off is;
s8 flywheel or 034 flexplate adapter $375
immobilizer defeat $150 (034)
auto defeat $550 (034)
wiring it in

As that suddenly racks up a fair chunk of cash if buying everything from 034!

I would assume that if you have the ecu sorted it should be the similiar to a 20vt swap etc, just picking up the right dash wires and fusebox?

[sam80quattro]

thanks for the info guys, i'll get reading..

[Sleeper_Avant]

Sam my fellow Geordie compadirae, VR6,

[sam80quattro]

although this is initially for a mate, i do intend on v8'ing my b4 80 saloon at some point...
tbh i wouldn't waste my time on a vr unless it was boosted and then for similar amount of work i'd still rather a v8, more so with boost

[Sleeper_Avant]

and me too with VRT

V8 not worth the hastle for me for the power created

but hey, the world would be a poo place if we all wanted the same thing right