Bsfc
I wish I was driving!
Joined: Dec 2001
Posts: 5,241
Likes: 84
From: BC, Canada
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; Feb 24, 2003 at 02:29 AM.
I wish I was driving!
Joined: Dec 2001
Posts: 5,241
Likes: 84
From: BC, Canada
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".
Thread Starter
**-P I drive a miata.
Joined: Jul 2002
Posts: 1,600
Likes: 0
From: albany, GA
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?
I wish I was driving!
Joined: Dec 2001
Posts: 5,241
Likes: 84
From: BC, Canada
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....
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Keep Right Except to Pass
Joined: Jan 2003
Posts: 984
Likes: 1
From: Seattle
Here's a calculator. http://www.rceng.com/technical.htm
Keep Right Except to Pass
Joined: Jan 2003
Posts: 984
Likes: 1
From: Seattle
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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