Here's a post from another happy customer who got the RPI scoops and custom tune from Powerchip...
Quote:
Originally Posted by stephenti
I had a chance to stop by RPI and got a first-hand look at the M Coupe that received the software. Got to do multiple pulls on the street and highway.
I want to qualify that I do not have a sensitive butt-dyno, and don't subscribe to the placebo effect like many, lol. In fact, I'm one of the guys who didn't feel the difference of the BMI and RPI scoop at street-level speeds after it was installed on a car that already had a SS x-pipe and race muffler. However, with RPI's reputation and fully knowing that it was dyno-proven many times over on multiple cars, the scoop is a no-brainer, especially given the price.
On to the software...
Well... I can say without doubt, the software makes a significant difference. And looking at the dyno graphs, it becomes very clear why.
The M Coupe was first dyno'd with SS x-pipe and race muffler (straight-through), charcoal filter removed, and BMI filter. Hood closed, with fan on. It dyno'd 258 rwhp on the DD at RPI.
After the RPI reflash, the peak rwhp was the same. Peak tq went from ~217.5@5krpm to ~224.5 ft.lb. However, the area under the torque curve experienced a significant change.
I've never paid too much attention about peak numbers... but rather, find it far more important the shape of the curve and area underneath. Peak numbers are for dyno-racers... area under curve translates to real-world performance.
Well, from ~2k through ~7k rpm, the torque cuve definitely looked like it got a good workout... here are some data points.
numbers are approx #s of INCREASE in rwtq and rwhp:
RPM - rwtq - rwhp
2180 - 13 - 05
2620 - 16 - 08
2800 - 08 - 05
3200 - 08 - 05
3540 - 09 - 06
4220 - 07 - 05
4900 - 07 - 07
5580 - 04 - 04
6260 - 10 - 12
6390 - 12 - 13
6940 - 00 - 00
I suspect that the difference of the peak HP would be greater if the car had a stock exhaust instead of the pre-existing SS x-pipe and race muffler. I also suspect that the SS x-pipe and race muffler was well-designed for the upper RPM range, while it didn't appear to have sacraficed any low-end tq when compared to the stock setup.
The graph showed that the new software smoothed out a major dip in the stock software at between 5850~6900RPM. And remember, that's on the low-reading DD dyno with no closed-loop ecu learning time, and the RPI's ram-air not in full effect. With more closed-loop ecu time, the ecu's mappings will tighten up more, with possibly more hp/tq to be found. And based on the stock 330 HP factory rating, this car could have 355~360 when all is said and done.
The car just pulls and pulls... felt great. No wonder the new owner had a silly grin after a few highspeed runs!
Stephen
|