Update on my JB4 + WMI setup for the AMG Emira. Been logging a bunch in Sport and Track.
TLDR: 490hp, car RIPS
After about 700 miles of testing so far I have settled on some settings that are stable. I might lower the boost additive to 40, will test that soon just to see if it tames overboost near redline. The methanol is providing exceptional cooling and anti-knock...I'm seeing on average IAT 10-15F above ambient after repeated pulls and hours of canyon driving. There's no observable heat soak and engine water temps are low.
Setup
- JB4 on Map 7 custom tuned at DRS with Terry's remote help
- Boost Additive set to 45 (this is how much boost is requested as methanol spray ramps up)
- Burger WMI kit, 100% flow at WOT, methanol ramps up at 15 psi
- High-flow cat, Weistec charge pipe, Aerie exhaust
Boost by Mode
- Sport: ~30–31 psi sustained
- Track: ~32–33 psi sustained
Power (SuperFlow Dyno) - usually the shop uses a 20% loss on their dyno which is verified with all the cars I have used there (Elise, Alfa). To be conservative I also show 15% loss. So let's call it averaged, the tune is making around 490HP. My car stock (charge pipe+hi flow cat+exhaust) was showing 342 whp on this dyno for reference, and is probably making around 415hp stock. A pick up of around 66whp/80hp -
Pump 91 Cali gas + map 7 (methanol on)
- Wheel: ~407 whp / 370 wtq
- 15% loss: ~479 hp / 435 ctq
- 20% loss: ~509 hp / 462 ctq
Intake Air Temps (IAT) with WMI
- WOT median IAT: ~83–91°F across recent logs (ambient 75-80F)
- IAT stays flat under load once WMI is active, no heat-soak climb
- Meth flow = 100% at WOT, consistent across pulls
Timing / Knock Health
- Average timing under load: typically low-teens to high-teens
~12-18° average with clean recoveries
- No pattern of sustained timing pull, and no throttle closures under boost
Notes
- Rear O₂ (P2270/P2271): shows up intermittently because of the high-flow cat + WMI. ECU trips lean or rich codes from the cat, previously before the JB4 it was showing rich only and the normal efficiency code.
- Stock my car was giving me overboost code when we installed the Weistec charge pipe and hi flow cat. We will recheck boost sensor connection but everything seems to be working fine with the JB4. I get overboost code in Track mode if I trip the rev limiter for longer than a couple seconds so I have been intentionally short shifting around 6500. With the dash delay and the car just sounding like it's going to explode at that point I feel more comfortable short shifting a little, power curve shows no real benefit maxing out revs each gear.
- Engine Oil Temp channel does NOT work in my JB4 app when I have live gauges going, anyone else see engine oil temp active?
- updated bluetooth module and app do not start live connection until the wheels are moving (might just be weird glitch on my car)
I'll take some photos of the methanol system and post the same data in a separate thread since V6 owners will get great benefit from this as well.
