Title: GS500 Dyno Charts?
Post by: proudlom on August 25, 2004, 02:55:14 AM
Post by: proudlom on August 25, 2004, 02:55:14 AM
Does anyone have or know where to find a dyno chart for the GS500? Or can anyone ellaborate on the following?
Thanks.
Thanks.
Quote from: danci1973Quote from: proudlomQuote from: tkm433BHP 39.2 @ 8360rpm
Does that mean to accelerate the fastest, you should upshift around 8360rpm or is it better when you wait till you're closer to the redline?
You'd have to look at the dyno graph to decide - if the power falls quickly after peak, then you should shift right after 8360rpm.
D.
Title: GS500 Dyno Charts?
Post by: Jasco on August 25, 2004, 04:52:09 AM
Post by: Jasco on August 25, 2004, 04:52:09 AM
http://www.gstwin.com/dyno_run.htm
Title: GS500 Dyno Charts?
Post by: octane on August 25, 2004, 07:26:13 AM
Post by: octane on August 25, 2004, 07:26:13 AM
Shift just past peak power to keep the rpm in the meat of the powerband.
I shift around 9,500 rpm.
http://octaneonline.com/ipw-web/gallery/GS500/dyno
I shift around 9,500 rpm.
http://octaneonline.com/ipw-web/gallery/GS500/dyno
Title: GS500 Dyno Charts?
Post by: Roadstergal on August 25, 2004, 09:49:07 AM
Post by: Roadstergal on August 25, 2004, 09:49:07 AM
Hmm.
On cars, I shift so that I land in the middle of peak torque with the shift completed.
On cars, I shift so that I land in the middle of peak torque with the shift completed.
Title: GS500 Dyno Charts?
Post by: octane on August 25, 2004, 10:20:15 AM
Post by: octane on August 25, 2004, 10:20:15 AM
Same theory. If you shift a little past peak you should fall into a good place. You don't want to shift so early that the rpms fall too far below where the motor starts making good power, but you also don't want to wait so long that power starts falling off on top, or you start floating the valves. I like the rpm to fall at the beginning or just shy of peak torque after my shift so I don't need to shift as much...depending on where/how and what I'm riding/driving.
You don't have to shift bigger, more powerful engines as much because they make useable power over a broader range. The GS peaks pretty high on the tach, so you really need to rev the snot out of it to stay where the good power is.
I haven't driven one in a while, but I'd bet your miata is pretty similar Roadstergal. Where do you see the best power in your car in relation to redline?
You don't have to shift bigger, more powerful engines as much because they make useable power over a broader range. The GS peaks pretty high on the tach, so you really need to rev the snot out of it to stay where the good power is.
I haven't driven one in a while, but I'd bet your miata is pretty similar Roadstergal. Where do you see the best power in your car in relation to redline?
Title: GS500 Dyno Charts?
Post by: pizzleboy on August 25, 2004, 12:07:01 PM
Post by: pizzleboy on August 25, 2004, 12:07:01 PM
Here's mine:
(http://pizzleboy.no-ip.info/pizzleboy/My%20bikes/2002%20GS500/Dyno%20Run%20-%20May%2010th%202003%20-%20ignition%20advancer.jpg)
(http://pizzleboy.no-ip.info/pizzleboy/My%20bikes/2002%20GS500/Dyno%20Run%20-%20May%2010th%202003%20-%20ignition%20advancer.jpg)
Title: GS500 Dyno Charts?
Post by: proudlom on August 25, 2004, 12:47:56 PM
Post by: proudlom on August 25, 2004, 12:47:56 PM
Thanks for all the replys. What does "SAE" and "corrected [hp]" mean?
Title: GS500 Dyno Charts?
Post by: Ed_in_Az on August 25, 2004, 01:00:18 PM
Post by: Ed_in_Az on August 25, 2004, 01:00:18 PM
Just one more take on shifting. Keep your RPMs between your torque peak and horsepower peak for maximum acceleration. Gauge your shifts to where the RPMs fall back to torque peak(or close to it) and you'll be in the motor's "sweet spot". :cheers:
Title: GS500 Dyno Charts?
Post by: Roadstergal on August 25, 2004, 01:17:03 PM
Post by: Roadstergal on August 25, 2004, 01:17:03 PM
Quote from: octaneI haven't driven one in a while, but I'd bet your miata is pretty similar Roadstergal. Where do you see the best power in your car in relation to redline?
I actually am seeking an inexpensive dyno run for the car. Stock 1.8 is the blue line, but I've done some pretty extensive mods (intake, headers, exhaust, software, lightweight flywheel) and want to see if that changes the character of the curve. I shift in the vicinity of 6.5K for now, and it does fine. I've run against a stock 1.8, and I'm mildly faster at low speeds, but at high speeds (over 80) I walk away.
Title: GS500 Dyno Charts?
Post by: octane on August 25, 2004, 02:03:46 PM
Post by: octane on August 25, 2004, 02:03:46 PM
Quote from: proudlomThanks for all the replys. What does "SAE" and "corrected [hp]" mean?
SAE stands for Society of Automotive Engineers - the organization that more or less developed the generally accepted formulas for many things motor related, including measuring HP. In a nutshell, dynos use a formula to calculate hp and there are many factors that can affect the number. The same vehicle can make significantly different numbers under varying conditions. "Corrected" means the number displayed has been corrected to come as close as possible to the SAE standard.
Title: GS500 Dyno Charts?
Post by: octane on August 25, 2004, 02:08:13 PM
Post by: octane on August 25, 2004, 02:08:13 PM
Quote from: pizzleboyHere's mine:
Damn Pizzle, that thing looks like an EKG!! What's up with all those spikes?!
Title: GS500 Dyno Charts?
Post by: Roadstergal on August 25, 2004, 03:49:41 PM
Post by: Roadstergal on August 25, 2004, 03:49:41 PM
Quote from: octane"Corrected" means the number displayed has been corrected to come as close as possible to the SAE standard.
Doesn't it also mean the number is an estimate of crank hp with a standard drivetrain loss factored in?
Title: GS500 Dyno Charts?
Post by: pizzleboy on August 25, 2004, 04:42:26 PM
Post by: pizzleboy on August 25, 2004, 04:42:26 PM
the spikes are from the shift from 4-5-6 while being in the maximum power band.
Title: GS500 Dyno Charts?
Post by: mojoworkin on August 25, 2004, 06:03:36 PM
Post by: mojoworkin on August 25, 2004, 06:03:36 PM
Yes, shifts. High horsepower, low torque. I take it to mean the clutch was in and the throttle was full. (or close to it)
Title: GS500 Dyno Charts?
Post by: octane on August 26, 2004, 08:10:46 AM
Post by: octane on August 26, 2004, 08:10:46 AM
Quote from: RoadstergalQuote from: octane"Corrected" means the number displayed has been corrected to come as close as possible to the SAE standard.
Doesn't it also mean the number is an estimate of crank hp with a standard drivetrain loss factored in?
That's essentially what the SAE formulas do. The most commonly used dynos (except at an engine builder's shop, etc.) are chassis dynos, which measure hp at the wheels after drivetrain losses. Wheel hp numbers are useful in the real world because it's the actual power you're getting to the ground. Advertised hp (like when Chevy tells you the new Corvette makes 450 hp) is at the flywheel. In fact, most of the hp numbers you hear thrown around all the time (short of enthusiasts like us that throw our rides on the chassis dyno) are at the flywheel.
Found this website, this guy can explain it better than me: http://neptune.spacebears.com/opine/horsepwr.html