AI only dyno
12-17-09, 06:36 PM
#4
I didn't return and thats the power I picked up. If I were to retune I know that figure would be doubled. I don't know how much cooler the air is, I don't have a temp guage on it( its carb'd). I go back tuesday to hopefully wrap it all up...
12-22-09, 06:55 PM
#7
Keep in mind this vehicle is around 1600#s...
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12-22-09, 07:09 PM
#8
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What kind of porting is on it? Sounds like a fair-size streetport.
12-22-09, 07:17 PM
#9
That was @ 15psi, I didn't make any more power above 15psi( only because there is no air to air Intercooler)
The power is retarded, I took a crew chief of a nascar team out and he was impressed.
The intake ports are stock, exhaust is ported..
Not to put HC on the spot, but...
https://www.rx7club.com/showthread.p...83#post5717883
The power is retarded, I took a crew chief of a nascar team out and he was impressed.
The intake ports are stock, exhaust is ported..
Not to put HC on the spot, but...
V1-V2
2.18 X 2.75 trim works out to be 63
average compressor area 4.83 sq inches
approx flow 48 lbs min @ 2.7 pr ratio 25 psi at 55% effic @ 120,000 rpm!
@ 14 psi 43 lbs/minute @ 55% efficiency
rw rotary hp: 48 lbs = 361 MAX
rw rotary hp: 43 lbs = 324 MAX
howard coleman
2.18 X 2.75 trim works out to be 63
average compressor area 4.83 sq inches
approx flow 48 lbs min @ 2.7 pr ratio 25 psi at 55% effic @ 120,000 rpm!
@ 14 psi 43 lbs/minute @ 55% efficiency
rw rotary hp: 48 lbs = 361 MAX
rw rotary hp: 43 lbs = 324 MAX
howard coleman
https://www.rx7club.com/showthread.p...83#post5717883
12-22-09, 07:23 PM
#10
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That's theory for you. Some rotaries will make 7 hp per lb of air, some will make 8+, and seeing how this engine is an S4 with lower compression, that doesn't seem to have affected it any, but you are making over 8 hp per lb of air in the worst case scenario. Pretty darn good!
12-22-09, 07:40 PM
#12
That's theory for you. Some rotaries will make 7 hp per lb of air, some will make 8+, and seeing how this engine is an S4 with lower compression, that doesn't seem to have affected it any, but you are making over 8 hp per lb of air in the worst case scenario. Pretty darn good!
I did fix the big bump in the torque curve too... Not bad for locking timing at 15degree advance.
12-23-09, 02:52 AM
#13
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That's theory for you. Some rotaries will make 7 hp per lb of air, some will make 8+, and seeing how this engine is an S4 with lower compression, that doesn't seem to have affected it any, but you are making over 8 hp per lb of air in the worst case scenario. Pretty darn good!
BTW, FIA specified R26B as 4708cc which again is 90% of equal capacity.
01-10-10, 02:51 PM
#14
We took it out a few weeks ago and it did well, but we needed to make some changes.
We're doing a new turbo manifold to eliminate the boost creep, lowering the boost to 12psi, adding an intercooler, and switching to just pure water injection.
Owner never went more than 3/4 throttle either, he said he was too scared!
We're doing a new turbo manifold to eliminate the boost creep, lowering the boost to 12psi, adding an intercooler, and switching to just pure water injection.
Owner never went more than 3/4 throttle either, he said he was too scared!
01-10-10, 08:35 PM
#15
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What's your take on pure water injection? Have you compared it versus pure Alcohol to see how it compares in terms of knock levels, IAT's and power levels?
01-11-10, 02:02 PM
#16
Water is a lot better at knock control. A previous engine for this rail blew on dyno when I switched to pure alochol, after making many pulls at 50/50. There was a cross fire problem. Even with a problem that serious the water kept it from blowing..
IATs don't drop even half as much with pure water, but thats what the intercooler is for. Without changing the tune to an aggressive one, the alcohol seems to make more power.
IATs don't drop even half as much with pure water, but thats what the intercooler is for. Without changing the tune to an aggressive one, the alcohol seems to make more power.
01-16-10, 01:15 PM
#17
Racing Rotary Since 1983
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my apologies on the V1/2. the turbo makes 52.5 pounds so it should do approx 760 CFM/1.92 = 396 SAE rw rotary hp.
or 52.5 X 10/1.3 = 404
i note your dyno chart is un-corrected so let's see your numbers in SAE.
caveats are:
hp from airflow is always an estimate.
dynos do differ
SAE only.
none of this is to be taken as a criticism of anything you have done. i appreciate your accomplishments and the fact that you have taken time to share them.
cooling per gallon:
gasoline 952
methanol 3136
ethanol 2398
water 8087
good job,
howard
or 52.5 X 10/1.3 = 404
i note your dyno chart is un-corrected so let's see your numbers in SAE.
caveats are:
hp from airflow is always an estimate.
dynos do differ
SAE only.
none of this is to be taken as a criticism of anything you have done. i appreciate your accomplishments and the fact that you have taken time to share them.
cooling per gallon:
gasoline 952
methanol 3136
ethanol 2398
water 8087
good job,
howard
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