MD/VA/PA Fall Dyno Day and Meet Oct 15 '11 - Page 6 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-18-2011, 11:24 AM   #101
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What did the Porsche put down, 170? I don't know much about them in general but when I saw "Porsche" and "turbo" I was expecting more.
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Old 10-18-2011, 11:28 AM   #102
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I thought I saw the monitor read 235. In fact I'm sure I saw it read 235, and the AFR's were 10 all the way across. Stupid rich.
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Old 10-18-2011, 11:44 AM   #103
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Oh, that would seem more reasonable. I think they didn't wind it all the way out on the first couple pulls, and then I left to go look at another car while they did a few more pulls. I do remember it being crazy rich, guess that provides some safety margin for an air cooled engine.
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Old 10-18-2011, 11:57 AM   #104
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I wanted to see that turbo'd karmann ghia do a pull. That thing was SICK.
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Old 10-18-2011, 12:02 PM   #105
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motor was blown on the kharmann
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Old 10-18-2011, 12:11 PM   #106
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Quote:
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motor was blown on the kharmann
Blown as in "it was ceased up", or blown as in "boosted"?
Not sure if this was serious or humor, cause if /\ then LOL.
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Old 10-18-2011, 12:29 PM   #107
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s sh sh sh

***** DONE BEEN BLOWN TH **** UP
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Old 10-18-2011, 01:13 PM   #108
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There is a lot of jibber jabber in this thread and absolutely no dyno plots.

the ****.
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Old 10-18-2011, 01:16 PM   #109
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i took like 5 pics of the kharmann, thats about it.

everyone had brain busy.
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Old 10-18-2011, 02:13 PM   #110
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Quote:
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well, I was at 83 whp on a pretty stock 1.6 with 67K miles on the engine. Ed asked me about my diff and I mistakenly told him it's a 4.3, but it is actually a 4.1 Not to mention the annoying exhaust leak. Not sure if this explains why so low, I am very tempted to run a leak down test on the car. The compression I did a couple of weeks ago was great (175 across all 4) so not sure what else could explain the low output.

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Don't worry about it, that dyno is a heart-breaker. You just can't compare numbers from different types of dynos.
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Old 10-18-2011, 02:31 PM   #111
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because instead of a pickup on the ignition, the dyno reads the engine speed by the rollers themselves.
so that means the final gear ratio is important, as well as actually KNOWING what is the final gear ratio. is there a way to "re-calculate" what the dyno would have read with a 4.1 diff ratio setting (instead of 4.3 which is what Ed assumed).

assuming a linear relationship (this may be a faulty relationship), the mighty 83 whp would turn into 87 whp (which is probably closer to what I would expect of the engine).

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Old 10-18-2011, 02:47 PM   #112
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nah he fixed yours because the redlines matched. the only thing it would chang ein this case would be the hp vs rpm. where the computer might have shown 85hp at 4k instead of 7k.

but i do think he did something odd when lars got strapped up, maybe he had the load turned up or something, but i do notice he doesn't run it like I'd expect on a dyno dynamics, where he would be WOT and turn the load on his controller to bring it to redline.
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Old 10-18-2011, 02:50 PM   #113
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Maybe we find a CheaterJet to dyno on in the spring?
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Old 10-18-2011, 02:52 PM   #114
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works for me.
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Old 10-18-2011, 03:32 PM   #115
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Quote:
Originally Posted by self View Post
so that means the final gear ratio is important, as well as actually KNOWING what is the final gear ratio. is there a way to "re-calculate" what the dyno would have read with a 4.1 diff ratio setting (instead of 4.3 which is what Ed assumed).

assuming a linear relationship (this may be a faulty relationship), the mighty 83 whp would turn into 87 whp (which is probably closer to what I would expect of the engine).

Florin
The dyno measures wheel torque and wheel rpm. The HP can be calculated from those 2 via HP = TQ * RPM / 5252. It doesn't matter what the ratio is. The only thing it affects is the RPM plot, like Brian said. So instead of 80 hp @ 4300 rpm you're actually 80 hp @ 4100 rpm.
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Old 10-18-2011, 09:50 PM   #116
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Quote:
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Why would 4th vs 5th affect hp? I thought that the only effect would just be to make the pull longer?
Yup that's correct.
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Old 10-18-2011, 10:11 PM   #117
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Dynojet.
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Old 10-18-2011, 10:21 PM   #118
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Let's just do a virtual dyno. whee.
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Old 10-18-2011, 10:21 PM   #119
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BTW Lars can you look at your logs? what was your kpa/psi?
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Old 10-18-2011, 10:54 PM   #120
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Quote:
Originally Posted by Faeflora View Post
Why would 4th vs 5th affect hp? I thought that the only effect would just be to make the pull longer?
I think if you are not in the 1to1 gear the amount of torque you output will be off. In lower gears you make more torque. Since the dyno measures torque and then uses the formula compute hp. So if you are not getting a correct torque value your HP will be off.

Quote:
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BTW Lars can you look at your logs? what was your kpa/psi?
I looked, I am not running enough. I was hitting around 200kpa.
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