completely stock...rwhp?
04-10-04, 04:28 PM
#26
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Originally posted by Hyperite
Where do you see that an auto makes that power sooner? I think you're mistaken, because flywheel horsepower is independant of the type of transmission installed, and aside from the rear housing shape, the engines are identical.
Where do you see that an auto makes that power sooner? I think you're mistaken, because flywheel horsepower is independant of the type of transmission installed, and aside from the rear housing shape, the engines are identical.
04-10-04, 04:38 PM
#27
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Originally posted by Hyperite
Well, fine...the peak power is lower in the RPM band, but also the peak horsepower number is lower. ie- manual could make 220rwhp@6500 and an auto 195rwhp@6200. An auto has 3.9 rear end, and manual has 4.1 ratio. An automatic by design makes its peak power earlier in the band, so in efforts to push the peak power a bit further up in the band to utilize the rotary's unique revving characteristics, a 3.9 gear was used for the autos. I don't think you make more power with a different gear, it just makes the timing of the peak power earlier or later in the band.
Well, fine...the peak power is lower in the RPM band, but also the peak horsepower number is lower. ie- manual could make 220rwhp@6500 and an auto 195rwhp@6200. An auto has 3.9 rear end, and manual has 4.1 ratio. An automatic by design makes its peak power earlier in the band, so in efforts to push the peak power a bit further up in the band to utilize the rotary's unique revving characteristics, a 3.9 gear was used for the autos. I don't think you make more power with a different gear, it just makes the timing of the peak power earlier or later in the band.
If a car is making 200rwhp at 6500rpm, that's all you get regardless of tranny/R&P gears. But usually, you'll have better acceleration with lower R&P gears than with higher R&P gears because you're utilizing the Engines 200rwhp quicker .
(guicker revs=quicker HP=quicker car).
Last edited by areXseven; 04-10-04 at 04:46 PM.
04-10-04, 06:18 PM
#28
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Damn.So us auto fd owners are losing 60 horses to the driveline.That sucks.Thats almost a 24% percent drivetrain loss.Compared to the manuals 14% drivetrain loss.I can see why most fd owners swap to a 5 speed.
04-10-04, 06:25 PM
#29
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Originally posted by areXseven
Ring and Pinion doesn't alter engine born HP. It simply spreads it or compresses, if you will, through a given power band in conjunction with transmission and ring & pinion gearing.
If a car is making 200rwhp at 6500rpm, that's all you get regardless of tranny/R&P gears. But usually, you'll have better acceleration with lower R&P gears than with higher R&P gears because you're utilizing the Engines 200rwhp quicker .
(guicker revs=quicker HP=quicker car).
Ring and Pinion doesn't alter engine born HP. It simply spreads it or compresses, if you will, through a given power band in conjunction with transmission and ring & pinion gearing.
If a car is making 200rwhp at 6500rpm, that's all you get regardless of tranny/R&P gears. But usually, you'll have better acceleration with lower R&P gears than with higher R&P gears because you're utilizing the Engines 200rwhp quicker .
(guicker revs=quicker HP=quicker car).
Originally posted by areXseven
The information is well documented in almost all the literature I have regarding the FD. Including Yamaguchi's book.
The information is well documented in almost all the literature I have regarding the FD. Including Yamaguchi's book.
04-10-04, 06:44 PM
#30
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Originally posted by Hyperite
Link me.
Link me.
By Jack K. Yamaguchi and John Dinkel
page 113
Mazda RX-7 1993 Dealer sales brochure
page 40
Last edited by areXseven; 04-10-04 at 06:54 PM.
04-10-04, 07:33 PM
#32
Originally posted by speeddemon7
Damn.So us auto fd owners are losing 60 horses to the driveline.That sucks.Thats almost a 24% percent drivetrain loss.Compared to the manuals 14% drivetrain loss.I can see why most fd owners swap to a 5 speed.
Damn.So us auto fd owners are losing 60 horses to the driveline.That sucks.Thats almost a 24% percent drivetrain loss.Compared to the manuals 14% drivetrain loss.I can see why most fd owners swap to a 5 speed.
04-10-04, 08:11 PM
#33
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Originally posted by Hyperite
Mmm...I don't have either of those. Also, those aren't links
I expected that 'well-documented' extended into the realm of the internet.
Mmm...I don't have either of those. Also, those aren't links
I expected that 'well-documented' extended into the realm of the internet.
The 1993 RX-7 Dealer brochure/booklet was given to prospected FD buyers after test driving the vehicle. Lots of great information in it, all authorized by Mazda Corp. Marketing and Sales Department.
Both books are sometimes offered on eBay.
Last edited by areXseven; 04-10-04 at 08:27 PM.
04-10-04, 11:53 PM
#34
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So what kind of horsepower numbers should I be at if I have a blitz intake and blitz nur spec catback.The car is an auto fd.Also what should my horsepower be if I were to also add a downpipe to the mix?
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