Mazsport dyno results!
12-26-2007, 04:52 PM
#76
Thanks!
The thing is - I love love LOVE a good argument. Good being the operative term.
I'll argue points in which I don't believe. I'd be a great lawyer if I didn't abhor everything for which that profession stands.
More importantly, I find that every point argued has merit while every point merely accepted does not.
The thing is - I love love LOVE a good argument. Good being the operative term.
I'll argue points in which I don't believe. I'd be a great lawyer if I didn't abhor everything for which that profession stands.
More importantly, I find that every point argued has merit while every point merely accepted does not.
12-26-2007, 05:10 PM
#78
I guess a couple of decades of being the "angry atheist" has given me a great deal of motivation to see emotional arguments go out the window.
In a sick sort of way, I like seeing people go up in a puff of emo-smoke.
Sometimes, its just easier to provoke someone than it is to convince them. That way, I get the instant win when they go after "the man" instead of the idea.
Yeah, this bothers me, too. Some of it may be the Int-X and the way it handles the SSV and injector staging, but that curve looks way too theoretical for my tastes.
Then again, the Pettit is even worse.
In a sick sort of way, I like seeing people go up in a puff of emo-smoke.
Sometimes, its just easier to provoke someone than it is to convince them. That way, I get the instant win when they go after "the man" instead of the idea.
Then again, the Pettit is even worse.
12-26-2007, 05:27 PM
#79
Its usually pretty clear (at least to me) what the manifold pressure is at any point in the run - just extrapolate the torque curve. You can see with Scott's run that the thing takes off after a bunch of RPM, so there is probably some lag there. On the opposite end of the spectrum is the GReddy, which starts to lose boost where the torque curve falls off.
The Pettit, being positive-displacement, has the flattest curve, meaning that its boost output is the most constant.
It is more common to plot A/F, but that is probably too arcane for this comparison.
Damn, that is deep. I really need to think about that for a minute.
12-26-2007, 05:37 PM
#80
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Well thanks for your feedback and compliments about our recent dyno results guys.
It's great to finally be in the same power league as a lot of the third gens out there. I am not saying for a moment we have surpassed the REW in performance, but we have not been working on it for 15 years either. (at least I haven't)
Thanks mysql, I think it's about time to raise the dyno graph from 350 to 400 for comparison purposes.
BDC, I appreciate your input but the timing I am running during this run is more conservative that what you are recommending, your approach might work in some applications but not on this car, in this weather, with this fuel.
Brettus, it is a rocket...It just pulls and pulls and pulls.
Sorry we got off track there but hopefully things will get back on topic.
Scott
It's great to finally be in the same power league as a lot of the third gens out there. I am not saying for a moment we have surpassed the REW in performance, but we have not been working on it for 15 years either. (at least I haven't)
Thanks mysql, I think it's about time to raise the dyno graph from 350 to 400 for comparison purposes.
BDC, I appreciate your input but the timing I am running during this run is more conservative that what you are recommending, your approach might work in some applications but not on this car, in this weather, with this fuel.
Brettus, it is a rocket...It just pulls and pulls and pulls.
Sorry we got off track there but hopefully things will get back on topic.
Scott
12-26-2007, 05:52 PM
#82
I kinda like the way your most recent graph shoots off the top, though.
"How much power did MazSport make?"
"Its off the chart, man!"
I think its pretty safe to say its back on track.
Last edited by MazdaManiac; 12-26-2007 at 09:27 PM.
12-26-2007, 06:03 PM
#83
Well, it should be the rated pressure all the way across. That is the beauty of a positive displacement blower (that is properly sized and driven).
I have yet to see a Pettit kit actually do that in person, but the videos seem to show that. Maybe I missed something.
I have yet to see a Pettit kit actually do that in person, but the videos seem to show that. Maybe I missed something.
12-26-2007, 06:22 PM
#84
BDC Motorsports
Well thanks for your feedback and compliments about our recent dyno results guys.
It's great to finally be in the same power league as a lot of the third gens out there. I am not saying for a moment we have surpassed the REW in performance, but we have not been working on it for 15 years either. (at least I haven't)
Thanks mysql, I think it's about time to raise the dyno graph from 350 to 400 for comparison purposes.
BDC, I appreciate your input but the timing I am running during this run is more conservative that what you are recommending, your approach might work in some applications but not on this car, in this weather, with this fuel.
Brettus, it is a rocket...It just pulls and pulls and pulls.
Sorry we got off track there but hopefully things will get back on topic.
Scott
It's great to finally be in the same power league as a lot of the third gens out there. I am not saying for a moment we have surpassed the REW in performance, but we have not been working on it for 15 years either. (at least I haven't)
Thanks mysql, I think it's about time to raise the dyno graph from 350 to 400 for comparison purposes.
BDC, I appreciate your input but the timing I am running during this run is more conservative that what you are recommending, your approach might work in some applications but not on this car, in this weather, with this fuel.
Brettus, it is a rocket...It just pulls and pulls and pulls.
Sorry we got off track there but hopefully things will get back on topic.
Scott
B
12-26-2007, 06:27 PM
#85
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theres more too it then that even... which is why i mentioned how the dyno smoothing function is setup (on some dyno sheets its actually listed by the weather correction factor)
12-26-2007, 06:34 PM
#86
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If my boost guage is crap(autometer), i've been told they can be off 1-2lb based on the weather, then maybe i'm actually making 7-9lb instead of 5-7.5.
Or maybe they're accurate, and even though i've tightened my belts on 3 occasions, belt slippage is accounting for the loss in pressure.
MM, if a properly sized and driven blower should be making allmost constant boost across the rev range, might the reason we're not making that with the Pettit kit be because of belt slippage??
12-26-2007, 06:44 PM
#87
Also, the blower may be sized somewhat too small for the application and slightly over-driven for target boost (or too large and under-driven).
The idea is to have the blower push out the swept volume of the motor at 100% Ve every time it spins.
This is unrealistic though because your boost curve would look like a smile!
Instead, you shoot slightly under-driven so that the blower "catches up" at the torque peak.
Come to think of it, this is probably why your boost is ramping up.
As long as you are at full boost before 6200 RPM, you are probably optimally sized, as long as that target is being hit without additional drive losses.
12-26-2007, 06:58 PM
#92
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Could you people keep all that damn yappin about personalities and such out of the thread, it makes it hard for slackers like my to catch up with all this futile bashing with some poorly articulated points against well written arguments.
Is this post a bit oxymoronic in nature? Perhaps. But someone had to say it, dammit.
Is this post a bit oxymoronic in nature? Perhaps. But someone had to say it, dammit.
12-26-2007, 08:20 PM
#93
Power!!
I just found this thread and wanted to say: Congratulations!
This is the most powerful Renesis dyno I've seen to date. I'm excited to see the spark issues have been overcome and you've pushed the envelop closer to that 400 whp mark everyone has been talking about.
Congratulations!!
This is the most powerful Renesis dyno I've seen to date. I'm excited to see the spark issues have been overcome and you've pushed the envelop closer to that 400 whp mark everyone has been talking about.
Congratulations!!
12-27-2007, 06:00 PM
#97
I need to try that smoothing factor sometime especially during V-TEC transition.
Last edited by crispeed; 12-27-2007 at 06:02 PM.
12-27-2007, 07:25 PM
#100
