Bill, What ratio of water/fuel you running?
The Sub is around 17% water / 83% fuel right now, give or take a smidge
based on InjW.... and I think I burn about 1.5-2 quarts in a 20 minute
session (I can check on Friday, going to Grattan again). I wonder if more
would be better?? Definitely need a bigger water tank though.
Also, what mix water/Meth were you running?
Wallyman
"Bill Cardell"
<[EMAIL PROTECTED]>
Sent by: To
[EMAIL PROTECTED] "Robert McElwee"
apower.net <[EMAIL PROTECTED]>, "Russ"
<[EMAIL PROTECTED]>
cc
04/29/2008 02:51 PM MiataPower List
<[email protected]>
Subject
RE: More water inj stuff
FWIW, Snow sells a 7 gallon water tank to use with the diesel pick-ups.
Running on the track at Thunderhill I didn't go through 3 qts in 20 minute
sessions. I will probably try experimenting with the massive amounts of
water at some point, though. The water injection has always scared me in
the past because of the possibility of disaster if you tuned to it and then
had a failure, but the newer kits with flow sensors give you a good safety
margin. You could either hook the flow meter signal to your boost solenoid
so it returns you to base/can boost with a failure or use it to trigger aux
fuel and timing maps as we do in the Hydra. Amazing what an extra 8 degrees
of timing does.
Bill Cardell
TurboDog's Dad
www.flyinmiata.com
1-800-FLY-MX5S (sales)
970-464-5600 (tech)
2008 FM Open House: August 14-17
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robert McElwee
Sent: Tuesday, April 29, 2008 12:45 PM
To: Russ
Cc: MiataPower List
Subject: Re: More water inj stuff
If you need a 13 gal water tank I suspect you would lose your driver's
license long before using up all the water. Not even I stay in boost that
long.
On Tue, Apr 29, 2008 at 2:37 PM, Russ <[EMAIL PROTECTED]> wrote:
Holy cow… 1.5:1? So with a 13 gallon gas tank, you'd want an equivalent
sized water tank. Doesn't need to be 1 ½ times the size since you
wouldn't be running WI all the time, just while on boost.
From: [EMAIL PROTECTED] [mailto:
[EMAIL PROTECTED] On Behalf Of Bill Cardell
Sent: Tuesday, April 29, 2008 11:19 AM
To: MiataPower List
Subject: More water inj stuff
Again from autospeed: Experimental test data show that water injection
into an unheated manifold, when the engine speed is reasonably high, will
not give water a sufficient time to vaporise during the compression
stroke. Of course, in normal operation of a naturally aspirated engine
the water does not vaporise until after combustion is well under way.
This effect well explains why injection of water into very highly
compressed or supercharged engines has been successful.
It is well evident that water injection slows the combustion process down
in SI [spark ignition] engines. Thus to maintain standard MBT [mean best
torque] spark setting the timing should be advanced... when using water
injection gasoline combinations.
The use of water injection in water/fuel ratios from 0-1.5:1 caused the
research octane number (RON) to rise from 70 to 93 and the motor octane
number (MON) to increase from 64 to 90. NOx emissions were substantially
decreased, being reduced by more than 50 per cent when a water/fuel ratio
of 1.5:1 was employed. Lanzafame suggests that the best results of water
injection come with a water/fuel ratio of 1.25:1.
With an intake air temp of 143 degrees C and a water/fuel ratio of 1:1,
the paper shows that peak cylinder pressure occurred about 20 crankshaft
degrees later and that the peak cylinder pressure was reduced from 56 Bar
to 37 Bar. With water injection occurring, rapid fluctuations in peak
pressure were also much reduced. Exhaust gas temperatures also dropped,
falling from 705 degrees C with no water injection to 692 degrees C with
a water/fuel ratio of 0.5:1, 675 degrees C with a water/fuel ratio of
1:1, and 665 degrees C with a water/fuel ratio of 1.5:1.
Look at the increase in octane rating! And also the ratio of water/fuel,
who needs gas? FWIW, since I've been running it on our Westfield, we
will be offering the Snow Performance kits shortly. Nice stuff, simpler
and cheaper than the hydramist and doesn't require a programmable ecu.
Bill Cardell
TurboDog's Dad
www.flyinmiata.com
1-800-FLY-MX5S (sales)
970-464-5600 (tech)
2008 FM Open House: August 14-17
_______________________________________________
Miatapower mailing list
[email protected]
http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
--
Robert McElwee and Red Beast
1991 T25 Turbo @ 15 PSI
Link ECU, FM IC, 9:1 pistons
Over 400 lbs of "added lightness"
www.lightweightmiata.com
Lightweight Miata Forum:
www.lightweightmiata.com/forum
The Miata Trailer Project:
www.lightweightmiata.com/trailer
_______________________________________________
Miatapower mailing list
[email protected]
http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
<<inline: graycol.gif>>
<<inline: pic10600.gif>>
<<inline: ecblank.gif>>
_______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
