DYNO Results - 84 GSL
07-29-06, 04:52 PM
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DYNO Results - 84 GSL
There are lots of threads here on what the RX-7 have the potential for....so I thought I would share my first dyno results with the group. I have a 1984 GSL which I have owned for 12 years (so I have invested slowly over the years!!) with a street ported 12A, Light flywheel, Weber 45 side draft carb and a full RB header, pre silencers and ractive muffler.
The results: 106 ft/lb @ 6069 RPM and 134.7 Hp SAE @ 6704 RPM at the wheels. The guy that Dyno'd my car says that the rear wheel HP understates the crank Hp by 20-30 hp - so that mean the car is producing roughly 150-160 Hp - not bad from the 100 Hp in its stock form.
The car is in great shape and I will post some pic for the group later.
The results: 106 ft/lb @ 6069 RPM and 134.7 Hp SAE @ 6704 RPM at the wheels. The guy that Dyno'd my car says that the rear wheel HP understates the crank Hp by 20-30 hp - so that mean the car is producing roughly 150-160 Hp - not bad from the 100 Hp in its stock form.
The car is in great shape and I will post some pic for the group later.
07-29-06, 07:46 PM
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The difference in power between rwhp and fwhp in a Gen 1 is around 17%. Exact comparisons seem to vary according to the dyno machine. Rotaries seem to have less performance drop than piston engines.There is some interesting comparisons of transmission loss on the RX-8 after some of the power figures put out by Mazda were queeried.
A well tuned street ported 12A can produce around 180fwhp according to some specialist tuners such as Yaw with engine dyno equipment. But then streetports come in various shapes and sizes!
A well tuned street ported 12A can produce around 180fwhp according to some specialist tuners such as Yaw with engine dyno equipment. But then streetports come in various shapes and sizes!
07-29-06, 07:57 PM
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Hey I was just wondering what your powerband was like?
I have an sdj header and holley intake, I havent noticed much below 4000rpm yet, but havent had too much of a chance to toy with it yet either.
I have an sdj header and holley intake, I havent noticed much below 4000rpm yet, but havent had too much of a chance to toy with it yet either.
07-30-06, 05:42 AM
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Originally Posted by Hyper4mance2k
Noice. That's a good number for a 12a.
Perhaps the 45DCOE is the restriction, I would have thought a 48IDA would have been a better choice. A Paul Yaw Nikki was supposed to put out about 145rwhp when fitted to a streetport.
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07-30-06, 10:54 AM
#8
Double Ds for me to share
i have a 12a thats is bridgeported on the primaries and large street ported on the secondaries and i made 133 rwhp. i'm runnung a road race header and weber 48 IDA. i must need to run better than 12.5 AFR
07-30-06, 08:02 PM
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Dyno Charts and Pics
Here is a jpg of the Dyno results (poor quality..but all I have). The red line was the baseline and the yellow line which is hard to see was the after we changed the size of the fuel jet. Also went out tonight and took some pics of the car. (hope these post ok - first time)
07-30-06, 09:15 PM
#10
Most all the streetports now are just the intake. It is recommended that when doing exhaust porting that you use new housings. So you are losing Hp by just doing the intake. Most people don't want to pop for new housings. The old numbers for Hp for a streetport, intake and exhaust were as follows. 12a, 195bhp, 13b,225bhp. This was with a complete header system and a weber carb set up.
07-30-06, 10:14 PM
#11
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Originally Posted by 84Sleeper
Here is a jpg of the Dyno results (poor quality..but all I have). The red line was the baseline and the yellow line which is hard to see was the after we changed the size of the fuel jet. Also went out tonight and took some pics of the car. (hope these post ok - first time)
good #'s.. the car must run good... nice job, and nice car too
07-31-06, 12:35 AM
#13
Originally Posted by 84Sleeper
Here is a jpg of the Dyno results (poor quality..but all I have). The red line was the baseline and the yellow line which is hard to see was the after we changed the size of the fuel jet. Also went out tonight and took some pics of the car. (hope these post ok - first time)
From what I've seen with ported motors like yours you should be making power past 6700 rpm? Your curve is falling off very quickly, but is very linear up to that point! What timing are you running? Plugs?
Anyway nice car! Keep us posted.
07-31-06, 12:44 AM
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not to get involved in this little quarrel, but RB is prolly trying to sell more by saying it is recomended to replace whatever. if its a piece of ****, then replce it, it its fine, then why bother??
07-31-06, 01:04 PM
#16
Originally Posted by vxturboxv
From what I've seen with ported motors like yours you should be making power past 6700 rpm? Your curve is falling off very quickly, but is very linear up to that point! What timing are you running? Plugs?
08-01-06, 07:45 PM
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Originally Posted by rx7doctor
Most all the streetports now are just the intake. It is recommended that when doing exhaust porting that you use new housings. So you are losing Hp by just doing the intake. Most people don't want to pop for new housings. The old numbers for Hp for a streetport, intake and exhaust were as follows. 12a, 195bhp, 13b,225bhp. This was with a complete header system and a weber carb set up.
08-02-06, 02:00 AM
#19
Originally Posted by 84Sleeper
Hi - as far as I know I am running stock timing, plugs and ignition. (would like to upgrade down the road).
08-02-06, 09:29 AM
#20
Originally Posted by REVHED
That's rediculous. The only reason to replace housings is if they show too much wear. Regardless of whether you want to port them or not.
not take a chance and do it better the 1st time and get more life out of the motor?
08-02-06, 05:03 PM
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The thing is, it doesn't matter whether you're porting them or not. Too much wear is too much wear. If they're good you can port them. Saying you can reuse the worn housings if you don't port them and just do the intake shows a complete lack of understanding on your part.
08-02-06, 07:43 PM
#22
Originally Posted by REVHED
The thing is, it doesn't matter whether you're porting them or not. Too much wear is too much wear. If they're good you can port them. Saying you can reuse the worn housings if you don't port them and just do the intake shows a complete lack of understanding on your part.
08-02-06, 11:38 PM
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This is what you said...
My point is... if the housings aren't good enough to be ported then they're not good enough to be used full stop. Understand?
Most all the streetports now are just the intake. It is recommended that when doing exhaust porting that you use new housings. So you are losing Hp by just doing the intake. Most people don't want to pop for new housings.
08-03-06, 01:03 AM
#25
Originally Posted by REVHED
This is what you said...
My point is... if the housings aren't good enough to be ported then they're not good enough to be used full stop. Understand?
My point is... if the housings aren't good enough to be ported then they're not good enough to be used full stop. Understand?
Again i will state the same thing. It is recommended(BY RACING BEAT) that ONLY on EXHAUST porting that you either use NEW housings or ONLY those in EXCELLENT shape).
Housings do not have to be in EXCELLENT shape only within specs and visual inspection to be used for NORMAL STOCK rebuilding. Again it is only a RECOMMENDATION, Sorry it's not my quote but from a reputable engine rebuilder that has been in business for many years.
And my statement that most streetports today are only intake should be that most do it yourselfers choose to do only the exhaust based on research i've done.
Is that more acceptable to you?
