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09-05-2014, 01:57 PM | #1 |
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▀▄ eas | EAS M4 enters the 500whp club - JB4 Stage 3 testing: 521whp/540ft-lb tq.
After seeing the impressive results with jc05e46m3's thread here, we were eager to get our JB4 installed and get some numbers. With cooler weather and some race gas (97 octane blend), we were able to crank out some pretty impressive numbers. An 1/8" NPT fitting was plumbed into the charge pipe to get boost readings.
Running Stage 3 configuration on 97 octane fuel, stock exhaust. Runs are maps stock (91 octane), 1 (mild boost, 97 octane) and 7 (E85/high octane map). Modifications BMC Filters 97 Octane Fuel STD SAE Conditions We're officially in M5 territory. Downpipes are going on next and returning back to the dyno for more logging/fine tuning.
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09-05-2014, 02:16 PM | #3 |
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Quite a bit, we were seeing ~100F temps in the shop last week through what seemed to be never-ending heatwave.
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09-05-2014, 02:18 PM | #4 |
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Nice. I can't wait to see what kind of numbers this car is going to make with FBO
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09-05-2014, 02:59 PM | #5 |
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Tom, awesome!
Those are great numbers and exactly what I would expect given the better temps, race gas and Stage 3 configuration. I would bet money there's another 20whp/20wtq just in fuel alone, not to mention the DPs you're going to install. Great work. Also, take a look at the Map 7 curve above 5500rpm in comparison with the Map 1 (or to mine) . It looks like the extra octane points are really helping out with keeping the power from falling off so severely. I'm liking how this is looking for sure!
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09-05-2014, 04:12 PM | #6 |
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I am assuming this is before any other mods like exhaust and DP? Wow that is a beast. I cannot believe how much potential this motor has.
I ran my stock M4 against a ESS 650 kit M3 today and that thing just goes. Would like to see a race with your car against the ESS M3. |
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09-05-2014, 04:18 PM | #7 |
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Those are impressive gains!
Appreciate that you also share that much info, both STD and SAE corrections and a stock run as a baseline Interesting that we see 20+PSI on a stock engine... Seems the DME is capable of exceeding the max stated boost pressure, at least during a dyno run at high temps. Would love to see some "real world" datalogging of a stock car, to see what boost pressures it runs max on the track/road. |
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09-05-2014, 04:26 PM | #8 |
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Yes, looking great - hopefully soon we will have our M4 on the Dyno with a full tank of 100 octane, JB4 and DPs to compare. - The car definitely rolls out.
Great work guys!! |
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09-05-2014, 04:29 PM | #9 |
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how much of that power is because of the higher rated fuel. I personally have never cared about how much power someone can make with race fuel. Because its not a something i would ever be tuned for in my car.
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09-05-2014, 04:58 PM | #10 | |
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09-05-2014, 05:00 PM | #11 |
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nice Tom!
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09-05-2014, 05:01 PM | #12 | ||
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Map 1 can vary anywhere from .1 to 26lbs of boost. In general, it hangs around +4psi above stock. Map 7 targets 25psi. Terry has run up to 28lbs on his personal car during testing. Quote:
The glory of the JB4 is that it doesn't matter if you're running crappy california 91 or MS109. The car will still adjust and perform. These numbers are great because they show what is possible with running something better.
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09-05-2014, 05:48 PM | #13 | |||
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Basically this means that we should NOT see max boost on a cool day at sea level etc. This is what would be interesting to see some datalogging of as well. This would be of most interest on a stock engine and no tune. |
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09-05-2014, 07:09 PM | #14 | |
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09-05-2014, 10:44 PM | #17 | |
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09-05-2014, 10:57 PM | #18 | |
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As of now, MAP1 is only available and different maps are being provided on a trial basis as logs are submitted to make sure everything is 100% safe.
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09-06-2014, 12:14 AM | #20 | |||
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You don't have to change maps, but obviously changing is much more beneficial. A stock car will still run stronger with higher octane. Quote:
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09-06-2014, 01:33 AM | #21 | ||
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Could you post the datalogging results? For instance with results for boost, IAT, altitude and MAF If we really see 20PSI of boost in real world driving, then that is one piece of evidence that supports under rating (if we are to believe BMW's claim of a absolute max boost of 18PSI... This might have been misunderstood though and it might also be that 18PSI is max for normal conditions and the DME can use overboost for worse conditions?) |
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