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Anybody have the OEM part number or details of the 1994 S4 standard turbo. Also the original 1994 S4 factory upgraded turbo part number. Did they use the RS2 one or did they use something completely different? orsum
The AANs in the UrS4 and UrS6 (1992-1997) (and the 3Bs and ABYs in the S2s) came equipped with a KKK (Kühnle, Kopp & Kausch, part of BorgWarner Turbo Systems since 1997) water-cooled, pressure-lubricated, turbo. We often call it a "K24" to distinquish it from the K26s used on the earlier Audi 10V turbos. More specifically, this turbo is designated as "K24-7000". Its Audi PN is 034145702 as shown in the diagram below.
This turbo was used from 1990 on the 3B S2 to 1997 on the last of the AANs. There was NO factory upgrade turbo per se. However, many people including myself have upgraded their AANs to RS2 specifications using the RS2's K24-7200 turbo (and RS2 exhaust manifold, injectors, MAF (optional and now NLA) and new software).
More K24-7000 and K24-7200 info is available here:
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RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
Sorry, I doubt that is "factory". However, I would believe "dealer" and I would believe either a Lehmann or MTM chipset and a MAP sensor upgrade. MTM had Stage 1 chips (stock 2.5 Bar MAP sensor) and Stage 1+ which was similar but upped the hp by 10 to 20 hp using a 3.0 Bar MAP sensor. MTM Stage 2 was Stage 1+ with an RS2 exhaust manifold. *NO* turbo upgrade
205 kW = about 275 crank hp. Stage 2 == chipset with a 3.0 Bar MAP sensor (probably) and maybe RS2 exhaust manifold. *NO* turbo upgrade. Still the OE K24-7000.
*IF* you opened the ECU, you would probably find either this:
or something like these with the 300 kPa (3.0 Bar) MAP sensor
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
If you have access to the 94 UrS4 in question, a quick look at the turbo can tell you whether the turbo has been upgraded. Have a look at the photo below.
The RS2 K24-7200 turbo is on the left and the K24-7000 is on the right. In both cases the hot-sides of the turbos are on their respective right sides and the cold side (the compressor side) is on their respective lefts. You can see the coolant and oil line connections on the center sections. If you look at the two cold sides, you can see that the RS2 turbo on the left has a thicker overall scroll than the K24-7000 on the right side. You can also see that thicker, raised portion of the scroll, where the bolts connect the scroll to the backing plate is wider on the K24-7000 on the right and narrower on the RS2 K24-7200 on the left. In fact, that is a good way to tell, at a glance, whether the KKK K24 turbo is an RS2 7200 turbo or the OE 3B, AAN or ABY K24-7000.
Photo courtesy of 95ninety
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
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