How Kane and Ray build a Ceramic, Ported, Turboed Renesis!!!!
11-16-2009, 12:33 PM
#301
Boost is important for compressors since that is what they do; flow is for motors.
The turbo may be able to push out seven zillion HP at 2 PSI; but if the motor can't flow that much air it is irrelevant - and vice versa. I may be explaining this whole thing poorly.... I guess the weaker link in the chain is what limits power might be an easier way to look at it.
11-16-2009, 12:36 PM
#302
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11-16-2009, 12:36 PM
#303
400WHP at 10 PSI on the GT3071R is not attainable on this motor.
Assume for airflow purposes we are running a 2.6 liter engine (since we don't have a dead stroke) and redo your math - I personally am aiming for 15PSI or so for my high power pull; and I'll be wicked stoked if I get close to 400WHP.
Assume for airflow purposes we are running a 2.6 liter engine (since we don't have a dead stroke) and redo your math - I personally am aiming for 15PSI or so for my high power pull; and I'll be wicked stoked if I get close to 400WHP.
11-16-2009, 12:38 PM
#305
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I really wish we didn't have to play super secret decoder ring club and you would actually be up front about things *sigh*
Judging by what you're saying, you've done something with the compressor wheel and you're running some sort of charge cooling.
It'd be nice to actually know what the heck you're doing with your RX-8.
But of course, I know you'll just call me an idiot and tell me that you don't need to be forthcoming with all of your secrets. I'm just a curious soul and would like to know, that's all.
11-16-2009, 12:40 PM
#306
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Or maybe I am, perhaps I should just give up
11-16-2009, 12:41 PM
#309
Well, 8600 rpm, 103% normalized VE, ambient intake at an intake pressure ratio of 1.73 can push 400 grams/second. Now on the chart you'd probably have a P/R of a little more than 1.8 adding a little pressure for system losses. The key then is intake temp. So I assume MMs turbo is a little more efficient at this flow rate and he is able to keep his intake temps very low (would be extremely low for Arizona were this the summer).
11-16-2009, 12:43 PM
#310
The PR is going to be higher; once you account for the Density Ratio and Pressure drop across the system to get say 10 PSI at the intake; which puts the PR into a higher and in this case more efficient island by and large.
11-16-2009, 12:49 PM
#311
10psi at the UIM translates to a PR of more like 2.0 (for greddy setups anyway) .
Last edited by Brettus; 11-16-2009 at 12:59 PM.
11-16-2009, 01:00 PM
#313
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Even with the PR being different, I only see that moving the point on the Y axis...
Unless I'm being completely obtuse, that shouldn't change the quantity of air... any point plotted along 50-53 lb/min range is outside the island of the compressor completely.
Now, obviously the MM Upgrade is not a stock GT3071R, but am I missing the fact that the compressor map *as I posted* should NOT flow 400 g/s of air?
Unless I'm being completely obtuse, that shouldn't change the quantity of air... any point plotted along 50-53 lb/min range is outside the island of the compressor completely.
Now, obviously the MM Upgrade is not a stock GT3071R, but am I missing the fact that the compressor map *as I posted* should NOT flow 400 g/s of air?
11-16-2009, 01:03 PM
#314
Even with the PR being different, I only see that moving the point on the Y axis...
Unless I'm being completely obtuse, that shouldn't change the quantity of air... any point plotted along 50-53 lb/min range is outside the island of the compressor completely.
Now, obviously the MM Upgrade is not a stock GT3071R, ?
Unless I'm being completely obtuse, that shouldn't change the quantity of air... any point plotted along 50-53 lb/min range is outside the island of the compressor completely.
Now, obviously the MM Upgrade is not a stock GT3071R, ?
Maybe he shoehorned a 3076 in there without telling anyone - it would need to be that size to flow the air he is claiming .....
11-16-2009, 01:13 PM
#316
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Now that makes more sense...
At least I know I'm not *completely* off base now. One thing that this discussion has made me realize is that I need to start thinking in terms of the full system, not just what comes out the outlet of the compressor.
Anyway, back on thread topic - congrats on the awesome engine Kane. I'm looking forward to seeing this beastie in person soon. VA isn't that far away, and to get a ride in the (Phantom) Blue Beast, I'll make the drive!
At least I know I'm not *completely* off base now. One thing that this discussion has made me realize is that I need to start thinking in terms of the full system, not just what comes out the outlet of the compressor.
Anyway, back on thread topic - congrats on the awesome engine Kane. I'm looking forward to seeing this beastie in person soon. VA isn't that far away, and to get a ride in the (Phantom) Blue Beast, I'll make the drive!
11-16-2009, 03:16 PM
#319
