Background on car: Eisenmann Sport exhaust installed 2007, SS headers and cats installed 2008, ESS kit installed 2009, 92mm pulley and water/meth 2010, Evolve/RK update kit consisting of Aeromotive fuel pump, Bosch green 42lb injectors, RK plenum plates, and Evolve tune in 2012
Dyno from 2012:
To get ready for the 88mm pulley, I checked for boost leaks:
I could hear a distinct leak coming from under the plenum. I first tested the under-plenum piping:
Everything was tight so I installed the plates and trumpets, and with pressure I could tell I was getting a leak around a few of the trumpet/plate junctions so I sealed them up.
92mm vs 88mm
Dyno time:
Water meth setup is an Aquamist running 50/50, 0.4mm pre-compressor jet, 2 0.7mm jets in the charge pipe
Before and after Nick G/CES Motorsport custom tune:
550whp with a conservative tune up to the limit of knock, redline was dropped from the ESS 7200rpm to 7000, 8 lbs of boost. 550 was the number I was hoping for and John Couchell at CES Motorsport and Nick Glantzis nailed it.
Beautiful. Unless you go with a FMIC and a lot more boost (and hence, a built engine), this is really the safe limit for an FI S62. Great to see Nick G still at it and doing S62s!
Great results and thanks for sharing! I have the same setup as yours with 92mm pulley except SS headers and cats (mine are stock) so we can make a dyno chart comparison shortly when I get the results.
What's the length of the belt you're using? I'm planning to install 88mm pulley in the future so I need to get the right length.
Thanks! I assumed the headers/cats would have netted more than 15whp. As Peter mentioned above, I had heard 550 was a safe limit for this motor so I was very pleased with that number and was OK with them stopping at that limit. The car has about 48K miles on it.
The car hasn't been stock since 2006 so it's hard to remember. 650hp is pretty quick. The broad torque curve and smoothly increasing hp curve make it so nice and predictable. I have a turbo m3 which is much more peaky and violent, so I prefer the m5. And the roar of the s62 is soooo nice...
What intake temperatures you observe while accelerating with meth ON during the summer? I'm not sure if my Aquamist works properly or just the IAT sensor is bad.
Did you dyno tune for the meth? Or are you just using for cooling?
When I tried going to the 88mm pulley back a few years ago, I was having belt slip and we could see the ESS mounting bracket deforming just a bit. Are you still using that same bracket?
Since photobucket sucks, I figured I'd at least add the before and after dyno pic to the thread. This is the 92mm pulley vs the 88mm with the Nick G/CES Motorsport tune.
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