The real question is, what to do to complement the RS4 cylinder heads. My current thought is to shoot for something in the 550whp range on the smallest turbo I can manage to hit that goal with on pump 93 octane fuel and a water/methanol injection system.
For a while now I’ve had a Eurodyne Boostmanager Plus+ water/methanol injection system on hand courtesy of FrankenTurbo with a Snow Performance pump. Finally I am getting around to having it installed, but I’ve still got
a ways to go before I have it fully operational and can make an assessment of the system. Above is a picture of a 2.5 gallon fluid reservoir and the Snow Performance pump mounted to a removable plate in the trunk. The fluid supply line runs under the driver’s side lower molding, beneath the dead pedal, and out through the rubber grommet in the footwell following the driver’s side frame rail, where it will then tee into either side of the APR bipipe.
Here is the BoostManager Plus+ mounted to a removable panel on the passenger side. Beside the BoostManager is mounted an Innovate LMA-3 datalogger.
Lastly, here’s the current state of the engine compartment. There’s still some work to be done installing an oil catch can as well as connecting the LMA-3 and BoostManager Plus+.
The refurb OEM 2 piece driveshaft was successful at eliminating the speed related vibration my car was experiencing. So it would seem that mine was one of the cases where a single piece driveshaft caused an unwelcome vibration in the car. Obviously spending the premium on a single piece driveshaft only to have to go and buy an OEM 2 piece style to remedy a problem caused by the 1 piece is not something I enjoy doing. The annoyance was further compounded by my need to have the swap done at a shop, thus paying for the labor time, increasing the total wasted money on trying a single piece driveshaft.
The way I see it, there are a mixed bag of reviews floating around about the success of using a single piece driveshaft, some cars seem to be fine, others experience a vibration. Given the cost premium and potential for problem I would never recommend a person purchase a single piece driveshaft for use on their S4 if they have the option of going with the tried and true OEM 2 piece unit.
At this point I’m not sure what will happen with this Driveshaft Shop one piece driveshaft. I expect it will be sent back to the driveshaft shop for evaluation. If it is determined that this driveshaft has a defect that could alter my opinion of the single piece. If and when the driveshaft I have is analyzed I’ll post the results as an update.