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| 03-23-2011, 08:18 PM | #1 |
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Procede N55 Dyno Testing (3-21 maps)
From testing today...
 CF: 1.05 2011 135, 7DCT Mods: Procede v5, Vishnu DP, Vishnu Charge pipe, muffler shop cat-back with dual 2.5" magnaflow mufflers, tightened wastegate actuator 91oct CF: 1.05 Tested in 5th gear (6mt and 7at should dyno in 4th gear) Graphs represent the following settings: 15psi, 50%IC 14psi, 50%IC 12psi, 50%IC Stock Tune Observations: -Due to turbo capacity limitations, all tuned settings make about the same power/boost above 5500rpm. So different boost settings just effect midrange and low end power/boost. The turbo is so flow limited that it will not support more than 14psi at 5000rpm. And by 6000rpm, it's down to just under 12psi. Perhaps upgrading the FMIC will reduce some pressure loss and increase top end boost/power. We will be installing an upgraded FMIC next week and will re-test. -We found that slightly tightening the wastegate actuator helped the turbo maintain slightly more top end boost. Not a lot. Just a little (0.5-1psi) This mod is easy to do when installing a downpipe. All you need is a 10mm wrench. Shortening the wastegate rod no more than 1/4 of an inch. If you shorten it too much, you will experience overboost in the 3700-4000rpm. -The DME refuses to let the car run beyond 6500rpm when dyno testing in 5th gear. This is because it throws a 13001 code for "Poor Road Surface" due to the fact that the front wheels aren't spinning along with the rears. Funny. -Here's a datalog of the 15psi run:  I'll post a "how to dyno your n55" once i finish writing it. There are a few unique issues with this platform. They are worth mentioning. Cheers shiv |
| 03-24-2011, 05:54 AM | #2 |
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Nice results Shiv..
Can I just clarify that all these figures are @ the wheels, not the flywheel/crank? It's just that 311bhp @ the wheels seems quite high for a stock tune? Or is that figure gained from the added DP? Also, what does 353bhp @ the wheels equate to at the crank roughly in your experience? |
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| 03-24-2011, 06:01 AM | #3 |
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Very, very interesting info, my tuner has exactly the same conclusion as yours about the N55's turbo.
sorry about that but what is the meaning of "50% IC" ? Last edited by Superfly; 03-24-2011 at 06:06 AM.. |
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| 03-24-2011, 08:48 AM | #5 |
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Peak HP at 5K rpm, thats pretty disappointing. With that much boost and exhaust breathing improvements I would expect it would spin up higher than that. Any better turbo in the works for this engine? Look forward to see what the larger IC can do to help.
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| 03-24-2011, 10:06 AM | #6 | |
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Interesting...subscribed
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| 03-28-2011, 11:12 AM | #9 |
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Update for how to dyno?
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