How To Cal. How Much Alky Your Spraying?
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If you know the pressure behind the nozzles you can calc the flow in gph
bison, the man who never sleeps.
humm. not sure right now. im going to install my razors alky pressure transducer this weekend so i will be able to get that for you. unless its over 150 psi since the transducer only goes to 150. not sure if it will hit that much on dual nozzles.
humm. not sure right now. im going to install my razors alky pressure transducer this weekend so i will be able to get that for you. unless its over 150 psi since the transducer only goes to 150. not sure if it will hit that much on dual nozzles.
I dont think you need to run 150 PSI on twin 15's.. the pump can flow the number, I bet your at 80-100 PSI.
M15 flows 15 GPH at 100 PSI, 9.49 GPH at 60 PSI
Yup.. the greater the orfice, the harder it is to make pressure. You cant make pressure on an open hose.
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this is how i doit
figure 6.63 lbs per gallon, your twin 15s at 100psi = 30gph or 198 lbhr
thats your alky input ..if your at 100psi
now for fuel only figure it takes .5 -.6 lb/hp
or 270lb/hr (~45lb/hr x6 injectors) to support 11.00 at 3700# (~550hp)
these figures need to be increased 5-7% if your running ethanol blended 93 because the 10% ethanol is a 6:1 AF fuel and so you only get about 95% of the power of straight fuel
meth needs 9:1: AF for stoich
so to acheive the same hp you need to add ~8% meth just to equal what the fuel used to be
then pull out 15% fuel based on fuel only tables and you need to add ~22% more meth to have the fuel capability to reach the hp needed
so 22% + 8% for the 93 blendeds lack of hp =30% methanol to 93 fuel by weight needs to be added as a minimum, on non ic cars you could need more
for me at 10.5 fuel only calculates to needing ~50lb hr x6 = 300lbhr fuel only to acheive the 600 hp needed using .5lbhr , and then need to add 8% for 93 blended fuel (now were at 324lbhr )... then I drop out 15% fuel for the alky and i need only 275 lbhr on my fuel or 45llb/hr per injector (using wideband correction at 10.9 AF it runs 55%inj duty of my 83s which =45.3lbhr ... bingo !
now i had to make up the HP difference with added fuel .. that fuel being methanol through razors pump
i'm running too much nozzle for 10.5 with a good i/c , running an M10+m15, thats 165 lb hr of meth or ability at 100psi to supply 50% vs fuel ...thats if i run at 100psi which i dont (im only at half gain)
i can tell you there was plenty of room to back it off as the inlet temps were only 60s
figure 6.63 lbs per gallon, your twin 15s at 100psi = 30gph or 198 lbhr
thats your alky input ..if your at 100psi
now for fuel only figure it takes .5 -.6 lb/hp
or 270lb/hr (~45lb/hr x6 injectors) to support 11.00 at 3700# (~550hp)
these figures need to be increased 5-7% if your running ethanol blended 93 because the 10% ethanol is a 6:1 AF fuel and so you only get about 95% of the power of straight fuel
meth needs 9:1: AF for stoich
so to acheive the same hp you need to add ~8% meth just to equal what the fuel used to be
then pull out 15% fuel based on fuel only tables and you need to add ~22% more meth to have the fuel capability to reach the hp needed
so 22% + 8% for the 93 blendeds lack of hp =30% methanol to 93 fuel by weight needs to be added as a minimum, on non ic cars you could need more
for me at 10.5 fuel only calculates to needing ~50lb hr x6 = 300lbhr fuel only to acheive the 600 hp needed using .5lbhr , and then need to add 8% for 93 blended fuel (now were at 324lbhr )... then I drop out 15% fuel for the alky and i need only 275 lbhr on my fuel or 45llb/hr per injector (using wideband correction at 10.9 AF it runs 55%inj duty of my 83s which =45.3lbhr ... bingo !
now i had to make up the HP difference with added fuel .. that fuel being methanol through razors pump
i'm running too much nozzle for 10.5 with a good i/c , running an M10+m15, thats 165 lb hr of meth or ability at 100psi to supply 50% vs fuel ...thats if i run at 100psi which i dont (im only at half gain)
i can tell you there was plenty of room to back it off as the inlet temps were only 60s
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100psi pump pressure would be 198lbhr of methanol fuel ...way too much if you have 100psi
-to run 11.00 @ 124mph at 3500lbs you only need 519hp
-to support 519hp with c16 you need 43.3 lbhr from each injector
-take out 15% and you only need 36.8lb hr from each injector ( 220lbhr)
that will only support ~440hp (11.60s @117 better to calc with mph @117 since some cars dont launch as they should so et would go up and hp required would also go up )
as i said you need 519hp for 11.00 @ 124 so you need more fuel added back to make that HP ..
since your not on ethanol blended 93 thats about 22% meth needs to go in , thats only 44lbhr of meth to have the fuel to support 124mph
but you also need to cool so replacing 15% might not be enough
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ill add
ive always run at initial set at 9:30 and gain knob at 50% and even a little less but
on the friday before my last pass I pulled the alky system to send to razor to check it out because i was seeing some wierd rise in inlet temps and fuel was correction was adding more than 20% and thought it might be the controller , (found the pressure side fittings had split but wanted to test the controller anyway before it went back in)
with razor on the phone (hes the greatest when it comes to support incase you didnt know) he told me how i could test myself and suggested (well told me!
) i had the pump running too slow at my settings
so i did what he said to do and reset to where he ships them
so with initial now at 12:00 and gain at 3/4 and bench tested and got the #s he said i should so back in went the pump and controller
... so thats the way i made the last pass way more flowing than i usually run
on that pass the log showed i was pulling out more fuel which maxed out my correction of -10% to where i was at only 48% duty at the shift drop (5300) with 10.9AF but up around 5800rpm had 50%duty (still maxed on -10%correction) with af dropping down in the 9.9s (still hit 103 1/8th) so there was a considerable amount of alky going in and it was definitely on its way to low low 10s even though it went 10.5 (#3 piston cracked and opened coming up to to the 1/8th)
and i was at 24psi so the map wasnt maxing the pump
looking by the #s i was probably at 40% meth vs 93 by weight (~25% displaced) since i hadn't maxed the maf running 24psi boost
when it goes back ill be dropping the nozzle sizes atleast to 2-10s or possibly just the single M15 since i have a decent FMIC
ive always run at initial set at 9:30 and gain knob at 50% and even a little less but
on the friday before my last pass I pulled the alky system to send to razor to check it out because i was seeing some wierd rise in inlet temps and fuel was correction was adding more than 20% and thought it might be the controller , (found the pressure side fittings had split but wanted to test the controller anyway before it went back in)
with razor on the phone (hes the greatest when it comes to support incase you didnt know) he told me how i could test myself and suggested (well told me!
) i had the pump running too slow at my settings so i did what he said to do and reset to where he ships them
so with initial now at 12:00 and gain at 3/4 and bench tested and got the #s he said i should so back in went the pump and controller
... so thats the way i made the last pass way more flowing than i usually run
on that pass the log showed i was pulling out more fuel which maxed out my correction of -10% to where i was at only 48% duty at the shift drop (5300) with 10.9AF but up around 5800rpm had 50%duty (still maxed on -10%correction) with af dropping down in the 9.9s (still hit 103 1/8th) so there was a considerable amount of alky going in and it was definitely on its way to low low 10s even though it went 10.5 (#3 piston cracked and opened coming up to to the 1/8th)
and i was at 24psi so the map wasnt maxing the pump
looking by the #s i was probably at 40% meth vs 93 by weight (~25% displaced) since i hadn't maxed the maf running 24psi boost
when it goes back ill be dropping the nozzle sizes atleast to 2-10s or possibly just the single M15 since i have a decent FMIC
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need to correct that since i had mistakenly calculated on the reduced fuel , it needs to be 22% of the gross fuel of 259lb.hr (43.3 X6injectors ) or ~57 lb hr of methanol
as razor posted a single
M15 flows 15 GPH at 100 PSI, 9.49 GPH at 60 PSI
a single m15 at 60psi is 9.49gph
thats 63 lb hr
oh and id like to add this link i just found to read which states what i have already been aware of based on my logs with use of the 10% ethanol 93 we have been getting here in NJ and used elsewhere
and why ive been pushing larger %s of meth than just the 15-20 norm we used to go by and why you can run a leaner 11.2-11.3 AF
http://www.innovatemotorsports.com/resources/news6.php
read the "tuning tip ethanol content" article klaus wrote
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yes ....
very good point
.pressure on a gauge hooked into the alky side or logged with a sending unit you have to subtract the running boost as its only that differential pressure that flows through the nozzle
very good point
.pressure on a gauge hooked into the alky side or logged with a sending unit you have to subtract the running boost as its only that differential pressure that flows through the nozzle
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looking through some old files i found this i had saved back in 9/05
nozzle vs pressure flow chart
nozzle vs pressure flow chart
