11-22-2021, 08:23 AM | #197 | |
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A 20% increase is better than what i was expecting anyways, and keeps my hopes high for a 240whp level with E85/header, granted that fueling system can handle that. |
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11-22-2021, 08:39 AM | #198 | |
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Last edited by ZDan; 11-22-2021 at 08:59 AM. |
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11-22-2021, 03:06 PM | #199 | |
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11-22-2021, 06:57 PM | #200 | ||
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At least so far, we've seen several dynos that suggest the delta is higher than expected when it comes to power. I think your math is correct, but is it possible there are other factors you're not accounting for that skew the numbers a bit? Not saying you're wrong, I just want to get down to the bottom of this, because I too am a bit skeptical about the dyno readings we have thus far. Although, they do seem to be piling up in the favor of power than we thought. |
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11-22-2021, 07:15 PM | #201 | ||||
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When I was doing performance modeling of my V8 RX7 for a Texas Mile run, I was surprised at how little trap speed was affected by drag coefficient. Even over a standing mile, at 185mph, power/weight is *everything* and aero drag isn't as big a player as you might think. FWIW I predicted 184 mph and hit 184.8mph Quote:
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11-23-2021, 01:29 AM | #202 |
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Not sure why you mix and match 1/4 mile times with peak power numbers. In such timings it is torque that matters the most and not peak power. Same about comparing on a dyno a 2015 (pre-facelift) car with new car. It is known that pre-facelift cars had a poor tune from factory and it was fixed a bit with the +'17 manual transmission cars. But still a 140whp result on a dyno for the old car is very shitty. The only thing I can imagine about the new one and the 228 hp catalog number is that ignition timing is less aggressive or D-4S is used more optimal and thus it is not that sensitive to fuel quality issues. Therefore the much better dyno numbers comparing to old car. Maybe in regions that you have shitty fuel the new one will be a much better option.
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11-23-2021, 05:52 AM | #203 | |
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I think if you don't trust dyno's yet, then we can't trust 1/4 mile yet either. Wind, launch, gear change - all vary. What we do know is its all pointing in the right direction. Edit: For example, theC&D 2016 FR-S was 1/4 @ 93mph, suddenly its 28% better. Another C&D had it at 94mph, and yet another at 95. Most recorded forum posts put them in the 89-91mph stock. 1/4 mile, unless its on the same night with perfect execution both times you are looking at small factors that blow out the results. I look forward to many cars dynos, and hope some owners get a chance to dyno back to back. Last edited by Blighty; 11-23-2021 at 06:29 AM. |
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11-23-2021, 07:17 AM | #204 |
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Kinetic numbers
Copied from a post from William Knose on Facebook. Again, 50 hp increase.
I will wait until I get more pumped up, but seems like car is doing very well. |
11-23-2021, 07:20 AM | #205 | |||
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Last edited by ZDan; 11-23-2021 at 07:45 AM. |
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11-23-2021, 07:40 AM | #206 | ||||
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But when posted dyno plots tell me a "header and a tune" will get me +30hp, I'm callin' B.S. on that... 1/4-mile trap speeds are *waay* more trustworthy. Even allowing for wind, launch, gear changes, etc. NA engines are pretty simple. Displacement pretty much dictates torque, and torque and rpm pretty much dictates power. There is no way +20% more displacement is making +34% more power in a very similar engine at the same 7000rpm peak. It's just not happening. Quote:
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11-23-2021, 08:39 AM | #207 |
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I’m assuming @DeliciousTuning is at least a bit surprised with the massive delta between the 2 cars. Maybe this will lead them to either a problem with their ZN6/ZC6 car, or maybe find something they overlooked. I agree it’s very unlikely this delta is representative of the real life difference. It’s possible I guess, but it just doesn’t add up.
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11-23-2021, 08:44 AM | #208 |
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.8 seconds and 6mph in the 1/4 is closer to a 50hp gain than 23 IMO
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11-23-2021, 08:46 AM | #209 | |
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https://www.ajdesigner.com/fl_horsep...trap_speed.php It uses this formula: HP = Weight *(Velocity/234)³ • For a car that weighs 2,900 pounds to trap at 95 mph, it requires 194.2 hp. • For a car that weighs 2,915 pounds to trap at 101 mph, it requires 234.4 hp That difference is exactly 20.6%. Another variable in this equation is gearing. The 2022 accomplished 101 mph with a 4.1 final gear versus a 4.3 final gear for the 2017 BRZ. That equates to 4.8% less torque multiplication and implies slightly more than a 20% power increase for the 2022 BRZ. I’ll be very curious to see future road tests. |
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11-23-2021, 09:01 AM | #210 |
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Nah, gearing (within reason!) doesn't affect trap speed much. 2013 BRZ did 95mph in the 1/4 with 4.1 diff, 2017 BRZ (with 5 more hp) also did 95mph with 4.3 diff, got there one tenth quicker... Trap speed is (pretty much) power/weight. Small advantage of 4.3 gearing at most speeds is negated by having to upshift sooner resulting in a huge disadvantage at some speeds.
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