Bsfc
02-24-03, 02:19 AM
#3
I wish I was driving!
No one knows what you are talking about.
He means Brake specific fuel consumption. It is the amount of fuel in lbs/hour that an engine will use for every horsepower, as far as I understand it.
I don't think any RX-7 owner cares. We know we get less hp/volume of fuel than a piston equivalent; this is the nature of the rotary.
Edit: A/F ratio numbers will give you a better indication of the information you're after, and they are far more widley available. We generally aim for A/R ratios of 11.5-11.7 for safe, street tuning, which is a BSFC of around .67 I believe
He means Brake specific fuel consumption. It is the amount of fuel in lbs/hour that an engine will use for every horsepower, as far as I understand it.
I don't think any RX-7 owner cares. We know we get less hp/volume of fuel than a piston equivalent; this is the nature of the rotary.
Edit: A/F ratio numbers will give you a better indication of the information you're after, and they are far more widley available. We generally aim for A/R ratios of 11.5-11.7 for safe, street tuning, which is a BSFC of around .67 I believe
Last edited by scathcart; 02-24-03 at 02:29 AM.
02-24-03, 02:32 AM
#4
I wish I was driving!
Yeah, we are generally seeing BSFC's of 0.64-0.67.
Hope this helps.
Why do you ask?
(Don't compare to other cars... it'll make us look bad. I know DSM's see them between 0.55 and 0.58, and as low as 0.50.)
As a comparison, the best you could hope for (I believe) is 0.40.
0.60 is considered "not good".
Hope this helps.
Why do you ask?
(Don't compare to other cars... it'll make us look bad. I know DSM's see them between 0.55 and 0.58, and as low as 0.50.)
As a comparison, the best you could hope for (I believe) is 0.40.
0.60 is considered "not good".
02-24-03, 02:44 AM
#5
**-P I drive a miata.
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Trying to find out the real #'s behind how much load the stock fuel injectors can take. I would rather see a real calculation than take someone's word for it. Stock fuel pressure is 35 PSI, right?
02-24-03, 02:58 AM
#6
I wish I was driving!
Originally posted by nonameo
Trying to find out the real #'s behind how much load the stock fuel injectors can take. I would rather see a real calculation than take someone's word for it. Stock fuel pressure is 35 PSI, right?
Trying to find out the real #'s behind how much load the stock fuel injectors can take. I would rather see a real calculation than take someone's word for it. Stock fuel pressure is 35 PSI, right?
As for not taking my word, it's up to you. You might notice no one else has piped up....
02-24-03, 03:09 AM
#7
**-P I drive a miata.
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not your word in particular, its just that numbers make me feel all warm and fuzzy inside.
EDIT: water injection would reduce the fuel consumption #'s right?
EDIT: water injection would reduce the fuel consumption #'s right?
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02-24-03, 04:24 AM
#10
Keep Right Except to Pass
Here's a calculator. http://www.rceng.com/technical.htm
02-25-03, 07:35 AM
#13
Keep Right Except to Pass
I'm getting 0.74 & 0.78 using 45 & 50# fuel pressure and I've got dyno #s to base it on. Stock injectors & I'm guessing at my fuel pressure. Also using 15% drivetrain loss to work backward from the 200 to the wheels #. This was a Mustang dyno, so if you want to put it into Dynojet terms, add 10%. Then my bsfc #s are 0.67 & 0.71. For what it's worth.
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