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Unread 07-11-2009, 02:27 PM   #1
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Default My '86 audi

Sold the '91 turbo jetta and bought this a while ago. An '86 Audi 4000 quattro with a 3.6 V8 from a 1991 Audi V8 quattro.

Here it is:





Plans for now are just to clean it up and iron out the bugs. The car was this guy's project for 5 years and he only drove it prolly 10 miles, so a lot of stuff is brand new on it, and a lot of other stuff is inadequate.

After taking it to an autocross (video below), I realized it need a sway for the rear and/or stiffer spring. It already has Bilstein sports in it, but the H&R springs in it are more for looks than performance. I am looking into getting ground controls with approximately 350lb springs all around. As for the swaybar, A lot of people take the front bar and put it in the back (front and rear suspensions are nearly identical on these cars), but I'm thinking of getting a fatter one to put in the back and leave the front one as is.

The motor just need a bit of fine tuning, as it is on standalone (034EFI and runs somewhat rich right now (noticable only in gas milage). I have a NAW_OEM wideband (14point7.com) to put in it, so that I can fine-tune the map and then run it in closed loop (with EGO correction). Eventually I would like to turbo it, but that is really far off since I am still a bit in debt from turboing the jetta. I have also been looking into getting a 4.2 V8 from a late 90's A8. These have a few advantages (aside from displacement) over the 3.6 that make for easier integration (and hence better tuning) into the standalone like coil-on-plug and an internal crank trigger, as well as better throttle body placement. Also these were rated at 300HP over the 240HP of the 3.6. This is much simpler than turbocharging the car, and does provide a decent bump in power. Although considering I have standalone, I am almost already half way there to a turbo V8.

One last thing, I hate the transmission in this car. It is kind of cool with the center diff locker, but that has a hard time engaging and often pops out (sometimes with a loud bang) which leads me to beleive that the center locker is fubar. So even though the car is AWD, I do get a lot of front wheelspin under really hard acceleration or accelerating through turns. This is not to say that the AWD is useless, as it still grips a lot better and pulls through turns very well compared to my jetta. Also the gearing on this transmission is designed for a 115HP I-5 and is rally-derived. This mean I cruising at 75 mph in 5th translates to 3500+ RPM, which also KILLS gas mileage. The plan is to source a transmission from a '91 audi 200. This has much longer gears as well as a torsen (mechanical clutchless LSD) diff in place of the center locker.

That is pretty much the deal for now. Plans change a lot. Currently waiting on a set of BFG G-force sports in 225 50 R15 to come in (which is reeeaaaaly wide for these cars) that I will mount on a set of old-school ABT wheels I have.

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Unread 07-11-2009, 05:08 PM   #2
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How is the interior?

Looks like it was kept in really good condition from the previous owner(s). Any plans for some body work?

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Unread 07-11-2009, 05:50 PM   #3
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Nice car man. I think that's the first time I have ever seen "4 OHC".
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Unread 07-11-2009, 08:00 PM   #4
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I worked in a VW/Audi dealer in the '80s and if my memory serves me correctly, the locker for the center diff was only to be used in low traction conditions, like snow or mud, NOT on the dry pavement. That would explain why it's hard to shift and licks out.

It's AWD with open diffs, find a locker or limited slip for the rear end.

Or just upgrade to the 200 center diff.
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Unread 07-12-2009, 09:56 PM   #5
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maybe instead of swapping the 3.6 V8 for the 4.2 V8, swap it for the 2.7V6 used in B5 S4/RS4's. the V6 was already designed to be FI, and it can hit 300HP+ at the crank with few mods (think a ECU tune & exhaust will do it, don't quote me though), and 400HP+ if you're willing to invest 5~6k into it. look around the net for more info, the B5 S4's are gaining a lot of popularity amongst tuner community

btw, i drive a B6 S4. not sure if the engine is same as the one you thinking bout putting in. if it is, i can tell you there aren't that many mods for that engine, and they aren't cheap either

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Unread 07-13-2009, 08:39 PM   #6
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Nope the B6 S4 has a 40v chaindrive 4.2 V8. Those are a little harder to integrate since you need to do something about the variable cam timing. It would be a better fit in this though since the chain-driven cams allow for about 1" less in length than the older belt-driven V8's. I am really looking into an ABZ which is a 32V from the A8's which is still a pretty simple motor by comparison.

I've seen 2.7t's get up to 400+ crank with simple mods (stock turbo's) but they are really really expensive, and b the time I spend all the money to put one of those in, I can a turbo V8, which is just 400+ anyways. I am not worried about the motor taking the pressure since just stacking headgaskets on headstuds has been proven to hold upwards of 20 psi. Besides if the motor does let go, they are cheap enough to replace, unlike a 2.7t.

Now as far as diff's go, the only reason it isn't supposed to be locked on dry pavement is because you will get excessive wheel hop and tire wear. Other audis I know of lock just fine. A locked diff would have really helped in the autocross or when I want to launch it so I can reduce front wheelspin. With a locked diff the power distribution automatically becomes rear-biases whenever the front unweighs. Did you know that the audi rally cars ran a spool in the center rather than a diff even on the tarmac stages? I am actually thinking about getting a locker transmission with taller gears, but only 4000's had the 4.11 final drive to match my rear diff. The 200 20v and [i think] the 5-speed v8 quattros (both quite rare) both had 4.11 gears but with a torsen center diff. Doh! what should I do? LOL.
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