VTT S55 Stock Motor Power/Torque Record 734 WHP / 762 WTQ

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Captain
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Oct 24, 2016
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We finally got around to finishing up the testing our on S55 Stage 2 turbo's, and the results were as we expected. We picked up the Stock motor S55 power record, previous it was 728WHP, we made 734WHP, and 729WHP on two different pulls this morning. We also managed to make 762WTQ on a more aggressive throttle map. If anyone wants to say glory pulls, posted below are 10 runs all above 700WHP from yesterday and today. The 734WHP, and 729WHP runs were made on the E30 OTS BM3 map, no special tuning, however the E30 scalar is too low when high in the revs, and even with PI adding a lot of help we are just plain out of fuel.

Dzenno gave us a map with better E85 scalar, more aggressive throttle, and 2-3 degrees less timing. On this map it picked up tq down low and pulls clean all the way to redline. We consider the E30 OTS map to be a little too aggressive timing wise for these boost levels so we wont run it there; custom maps are always better for these power levels.

As can be seen below, we're making 500WTQ by ~3300 rpm, and 700WTQ by 3800 rpm. This is a solid 500+ RPM better spool than the other turbos you see on the market.

A big thanks of course To Dzenno at BM3 for the help, its fun working with him again! Also to Terry, Mike at EOS, and Bell intercoolers for the great intercooler. Not to mention the owner who let us use his car as a test bed!

There is one S55 making more power at 745WHP (11WHP more), which is a fully built motor, fully ported head, 9 second race car, and one car making more Power / TQ at 763WHP/776WTQ (14WTQ more) and is rumored to be running a 100 shot of NOS. Impressive? We think so...
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Next up will be taking the car to the track and 1/2 mile events and prove the car out. Track and 1/2 mile events aren't easy to perform well at, but we'll take the lessons we learned when dominating the N54 world at the 1/2 mile events and see what sort of fun we can have with the S55.

Specs:
2015 BMW M4 DCT
Dodson Sportsman Clutch upgrade
100% Stock motor
Stock Crank hub
VTT Stage2 turbos
VTT silicone charge pipes
BMS intakes
Aftermarket downpipes
Catless exhaust
EOS V2 top mount PI manifold
PFS Double Shot LPFP Upgrade
VTT / Bell Air to Water intercooler
Custom BM3 flash by Dzenno
JB4
100% E85
Boost level 34-35 psi

Log:
http://www.datazap.me/u/vargasturbotech/vtt-s55-run-34-723whp745wtq?log=0&data=1-4-5-10-12-14-18-24

10%20levels%20of%20700%20S55.jpg
723_745%20Map%2014.jpg
FullSizeRender.jpg



Of note to those that follow the N54 scene, is the comparison of these to our built-motor N54. The turbos are very similar in flow capacity. Large difference in spool and holding power up top!

VTT%20built%20N54%20vs%20Stock%20S55.jpg



-Chris
 
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doublespaces

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Interesting... I suppose a couple PSI could be due to conditions/weather/variance and the other 2-3 pounds, perhaps just a difference in supporting mods?....Or maybe the s55 head isn't very good but I kind of doubt that.
 

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Captain
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I didn't even notice that... @[email protected] @[email protected] what do GC's need to run that same power? I realize there are a lot of other things in play, just curious.

Hard comparison -on our build motor we have a lot of head work done and larger valves, and dropped compression -with that setup we made the same power at about 25 psi -way less. With a stock head we'd be closer but still way more power at same boost. Tony thinks the S55 head flows worse than the N54's from what we've seen so far... but we'll be able to say for sure as we dive more into it.
 
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doublespaces

General of the Army
Oct 18, 2016
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Hard comparison -on our build motor we have a lot of head work done and larger valves, and dropped compression -with that setup we made the same power at about 25 psi -way less. With a stock head we'd be closer but still way more power at same boost. Tony thinks the S55 head flows worse than the N54's from what we've seen so far... but we'll be able to say for sure as we dive more into it.

Wonder if it has anything to do with the water cooling vs the air unit?
 

08_335i

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Nov 3, 2016
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Would've expected the S55 to make a lot better power up top. Comparing to the n54, n54 can hold top end a lot better.