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Audi S4 V6 biturbo on a 931

 
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stv951  



Joined: 06 Mar 2005
Posts: 100

PostPosted: Mon Mar 27, 2017 7:28 am    Post subject: Audi S4 V6 biturbo on a 931 Reply with quote

Hello,

I have been offered a complete 1999 audi S4 B5 at a very low price. car runs amazingly well

I have a 931 without an engine.
I am seriously considering installing this
Anyone done it ?

Would it fit ?
I mean, how hard can it be since many install these V8s

Drop a line with your suggestions
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Steve
931 81 177 bhp White
931 81 0 bhp engineless Platinum
924S 86 stripped with cage for Track days Red
944 83 Auto Blk
924 84 project 924 CGTS with 951 running gear
944 S2 90 Convertible 3xBlack
951S 91 Vitesse stg 3 350 bhp
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stv951  



Joined: 06 Mar 2005
Posts: 100

PostPosted: Sun Apr 02, 2017 3:23 am    Post subject: Reply with quote

Anyone ?
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Steve
931 81 177 bhp White
931 81 0 bhp engineless Platinum
924S 86 stripped with cage for Track days Red
944 83 Auto Blk
924 84 project 924 CGTS with 951 running gear
944 S2 90 Convertible 3xBlack
951S 91 Vitesse stg 3 350 bhp
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11335
Location: PacNW

PostPosted: Sun Apr 02, 2017 6:05 am    Post subject: Reply with quote

OK, I'll bite.

Hell yes, you should try it, why not? I don't know if anyone has done it, but there is currently an Audi V8 going in a 924, so one would think it would fit. The only space issue which springs to mind is about the intake. . .the S4 has two intercoolers.

*The B5 is a 2.7l 90° V6, cast iron block, aluminum heads, four cam, five valves/cylinder, twin turbo. 265 HP in stock euro trim.

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stv951  



Joined: 06 Mar 2005
Posts: 100

PostPosted: Sun Apr 02, 2017 8:07 am    Post subject: Reply with quote

Rasta Monsta wrote:
OK, I'll bite.

Hell yes, you should try it, why not? I don't know if anyone has done it, but there is currently an Audi V8 going in a 924, so one would think it would fit. The only space issue which springs to mind is about the intake. . .the S4 has two intercoolers.

*The B5 is a 2.7l 90° V6, cast iron block, aluminum heads, four cam, five valves/cylinder, twin turbo. 265 HP in stock euro trim.


Thanks for your reaponse
How hard could it be ?
Would it be connected easily with the transmission tube ?
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Steve
931 81 177 bhp White
931 81 0 bhp engineless Platinum
924S 86 stripped with cage for Track days Red
944 83 Auto Blk
924 84 project 924 CGTS with 951 running gear
944 S2 90 Convertible 3xBlack
951S 91 Vitesse stg 3 350 bhp
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nickthompson  



Joined: 26 Mar 2013
Posts: 847
Location: Central Georgia

PostPosted: Sun Apr 02, 2017 12:05 pm    Post subject: Reply with quote

If you are good at fabbing or know someone that is that making it fit will be pretty easy. When I was doing my 1.8t I had to make almost everything. I had to get my cousin to help because I can't weld aluminum. I'm not even sure you'd call what I do to steel welding
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stv951  



Joined: 06 Mar 2005
Posts: 100

PostPosted: Sun Apr 02, 2017 5:27 pm    Post subject: Reply with quote

nickthompson wrote:
If you are good at fabbing or know someone that is that making it fit will be pretty easy. When I was doing my 1.8t I had to make almost everything. I had to get my cousin to help because I can't weld aluminum. I'm not even sure you'd call what I do to steel welding


I know what you mean.
I have good access to someone who does weld aluminum and he s pretty good at it.

Show us your progress on the 1.8T conversion
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Steve
931 81 177 bhp White
931 81 0 bhp engineless Platinum
924S 86 stripped with cage for Track days Red
944 83 Auto Blk
924 84 project 924 CGTS with 951 running gear
944 S2 90 Convertible 3xBlack
951S 91 Vitesse stg 3 350 bhp
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nickthompson  



Joined: 26 Mar 2013
Posts: 847
Location: Central Georgia

PostPosted: Mon Apr 03, 2017 12:39 am    Post subject: Reply with quote

The project has hit several bumps. I had an oil flow issue that resulted in the head and turbo needing replacement. I fixed the issue and I'm a head bolt set away from putting it back together.
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nickthompson  



Joined: 26 Mar 2013
Posts: 847
Location: Central Georgia

PostPosted: Thu Apr 06, 2017 11:21 am    Post subject: Reply with quote

https://youtu.be/JWmDXZpMAbc
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Horizonblue  



Joined: 13 Oct 2011
Posts: 304
Location: Sorring city, Denmark, Europe

PostPosted: Thu Apr 06, 2017 7:03 pm    Post subject: Reply with quote

You mention V8 conversions..... most of them are GM smallblock or LS series. I guess the reason why that looks easy, is that you can purchase anything you need to make such a conversion; misc brackets, oil pan, clutch, etc etc. For the Audi V6 biturbo you can purchase nothing....

I have installed a VW straight six engine in my car, and for that conversion, NOTHING can be purchased, I had to fabricate A LOT. Well ok, I had to convert the engine to EFI also.

The only easy thing on that project, was that the engine could bolt right up to the original bell housing and I could keep the original brake booster.

One of the first problems I'm pretty sure you will encounter(besides engine to bellhousing connection), is clearance for the oil pan. I have not seen a good picture of the oil pan on your engine, but I'm pretty sure that you will need to fabricate a new one, since there is NO space between the crankshaft centerline and the cross member. Well, maybe 4 inches, I don't recall the exact distance.

Next issue is the brake booster. A V-engine means that you will have to ditch the original brakebooster (probably not enough space for it) and install something else, maybe BMW hydroboost.

Hood clearance can also be an issue......

You would probably be happier with another gearbox, that has a taller gear ratio.

But when these problems are over, it gets "easier". Now it's on to fabricating/installing engine mounts, exhaust system, accelerator cable, coolant hoses, oil cooler, electrical wiring, fuel lines, the list goes on and on.

My advice; If you have a large garage, a lot of patience, fabricating skills (or a very good friend with fabricating skills), money and time, go for it!

It's a cool project, but if one of the mentioned factors are not present, i'm not sure I would recommend it.
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