Had the car tuned at UMS and made 206whp/178lbft on 91, which is about what I expected. I still need to do a NASA classing dyno run, but I am expecting around 200whp average.
Corner weighted the car yesterday. The below pictures are without me in the car and before the corner weight was done. Fuel loads were comparable, but the basic gist is that moving from the FA20 and Harrop to the K dropped about 200lb from the car.
2901lb to 2687lb
Before:
After:
I've also been chasing oil pressure and oil temp issues since I first started the car, which I think I've finally reduced to being a wiring harness shielding issue. DBW is interfering with the other sensors.
A few notes:
1. Base TDC angle was 304* in the KPower map, Haltech lists 311*, my tuner got 300* with the timing gun. Who knows.
2. Knock sensor settings on the base map are basically unusable
3. We were only able to update to v3.05.1 firmware. Haltech support line confirmed that their stuff is broke af.
4. Tuner found that 90% was the highest power for throttle opening, this made a 6whp difference from the stock 100%. You can create a Drive By Wire Max Throttle Position map with your axes as dbw throttle position and RPM then set it to 90*
5. The base map target lambda table is rpm vs cable throttle position, so it is always 0. It needs to be changed to DBW throttle position.
A few other common KPower issues have cropped up that I intend on addressing sooner than later:
1. Driveshaft vibration - I'm going to have the stock driveshaft shortened at a local driveshaft shop
2. Throttle body bolts shearing - I bought IAG WRX street mounts that look to have significantly less movement allowed than the stock WRX mounts. If this isn't enough then I will cut the intake tube shorter and use a longer silicone coupler.
3. Header cracking - Hopefully the IAG mounts also help with this, I'm also going to replace the existing flex joint in the Perrin with a larger one. If it cracks at all I will have the entire thing rewelded.
Anyway, where this brings me to is that I've made a pretty dumb mistake with the NASA calculator. I expected the car to slot right into the top of ST/TT5 as it sits, but I now realize I forgot to check the box for suspension external reservoir.
2830 min comp weight
Toyo RR or Maxxis RC1
Non-OEM Brakes
A-Arms Modifier
Suspension Arms Modifier
Suspension Bushing Modifier
External Reservoir Modifier
This comes out to 191whp avg. Removing the res modifier would make it 200whp avg.
Bumping to 4 on Toyo RR / Maxxis RC1 at the same weight would give me a 285whp avg. Dropping the ~100lb of easily removed weight in the car would still give me 275whp.
The three options are, in preferred order:
1. Buy Xidas and sell the JRZs
2. Set the rev limit lower, which would lower the average whp a bit since the power is basically flat from 7300rpm to 8200rpm. I can also set a max DBW throttle position if I need to chop more.
3. Run the car as a ST/TT4 underdog for now and build the ~275whp K24 sooner than later. I did this with my S2000 and it went well, but that was before the new tire point rules.