A-Spec GT35R initial dyno
11-24-04, 07:54 PM
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A-Spec GT35R initial dyno
Put the car on the rollers for it's initial dyno. Unfortunately, we only managed one preliminary run (after some basic tuning) to 7K before the clutch started slipping and we (Ralph, actually- I didn't do a damn ting 
didn't get it fully tuned. You can clearly see the slipping around 5200 RPM as well as 6K.
Results are encouraging- 362 RWHP @12 PSI on a Mustang dyno with very rich AFRs. Engine is a stock ported Mazda reman with about 15K miles, which include approximately 2K road racing miles (on the old twins).
Ambient temp was 67 degrees, sea level, 68% max inj. duty.
Running 500/1600 injectors, big Bosch pump, -8 lines, 3.75" exhaust, M2 airbox, M2 medium SMIC, and PFC.
New clutch/results forthcoming.
Gene
didn't get it fully tuned. You can clearly see the slipping around 5200 RPM as well as 6K.Results are encouraging- 362 RWHP @12 PSI on a Mustang dyno with very rich AFRs. Engine is a stock ported Mazda reman with about 15K miles, which include approximately 2K road racing miles (on the old twins).
Ambient temp was 67 degrees, sea level, 68% max inj. duty.
Running 500/1600 injectors, big Bosch pump, -8 lines, 3.75" exhaust, M2 airbox, M2 medium SMIC, and PFC.
New clutch/results forthcoming.
Gene
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11-24-04, 09:40 PM
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Originally Posted by vosko
how does it have 200tq @ 3k rpm???
11-24-04, 09:51 PM
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was the clutch spinning above 6krpm? usually when either the clutch or the tires spin, it'll throw off the dyno #'s since it still thinks you're applying the same amount of torque (to the roller) but your rpm climbs faster. I think mustang dyno uses an ignition pickup for rpm trigger correct?
good low rpm torque #'s btw
good low rpm torque #'s btw
Originally Posted by gfelber
Put the car on the rollers for it's initial dyno. Unfortunately, we only managed one preliminary run (after some basic tuning) to 7K before the clutch started slipping and we (Ralph, actually- I didn't do a damn ting didn't get it fully tuned. You can clearly see the slipping around 5200 RPM as well as 6K.
Results are encouraging- 362 RWHP @12 PSI on a Mustang dyno with very rich AFRs. Engine is a stock ported Mazda reman with about 15K miles, which include approximately 2K road racing miles (on the old twins).
Ambient temp was 67 degrees, sea level, 68% max inj. duty.
Running 500/1600 injectors, big Bosch pump, -8 lines, 3.75" exhaust, M2 airbox, M2 medium SMIC, and PFC.
New clutch/results forthcoming.
Gene
didn't get it fully tuned. You can clearly see the slipping around 5200 RPM as well as 6K.Results are encouraging- 362 RWHP @12 PSI on a Mustang dyno with very rich AFRs. Engine is a stock ported Mazda reman with about 15K miles, which include approximately 2K road racing miles (on the old twins).
Ambient temp was 67 degrees, sea level, 68% max inj. duty.
Running 500/1600 injectors, big Bosch pump, -8 lines, 3.75" exhaust, M2 airbox, M2 medium SMIC, and PFC.
New clutch/results forthcoming.
Gene
11-24-04, 10:15 PM
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Originally Posted by rynberg
Very good question. I wonder if the stock ports help. If I could make that good of a low end with a single, I would ditch the seq twins...
11-24-04, 10:27 PM
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Originally Posted by vosko
how does it have 200tq @ 3k rpm???
11-25-04, 12:40 AM
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Originally Posted by pluto
was the clutch spinning above 6krpm? usually when either the clutch or the tires spin, it'll throw off the dyno #'s since it still thinks you're applying the same amount of torque (to the roller) but your rpm climbs faster. I think mustang dyno uses an ignition pickup for rpm trigger correct?
good low rpm torque #'s btw
good low rpm torque #'s btw
Yes. I did not spin on a prior run to 6K RPMs where it actually made more torque and a slight bit more HP (per RPM). Ralphs setup uses a crank trigger for RPM to minimize error. Can also calculate losses due to wheel spin, bad clutches, and drivetrain effects.
Gene
11-25-04, 12:45 AM
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Originally Posted by the_glass_man
Looks good so far, what kind of clutch are you going with?
I'm going with an RPS 6 -puck.
Gene
BTW- website will be up this weekend, but with a new URL. I'll let you guys know where to find it.
11-25-04, 01:34 AM
#19
Mad Man
I may try a full face bronze disc with an extreme plate. I run it in my supra, and they are good for 15,000 of hard driving. The ACT plate (HD) with the disc I am talking about holds ~750ftlbs.
11-25-04, 11:20 AM
#21
I won't let go
Damn...I can't wait to throw mine on the dyno now. My mods below. Looks good. As some have mentioned...hopefully there aren't real discrepancies with the results. I go low, so I was thinking about 350 at 15psi. I'm not good as guessing that.
11-25-04, 12:24 PM
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Originally Posted by Railgun69
Damn...I can't wait to throw mine on the dyno now. My mods below. Looks good. As some have mentioned...hopefully there aren't real discrepancies with the results. I go low, so I was thinking about 350 at 15psi. I'm not good as guessing that.
Gene
11-25-04, 12:27 PM
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Originally Posted by pp13bnos
Is that clutch the Pineapple Racing 6 puck? Thats what I've been running since I lost the clutch with the help of Ralph too. I love the clutch btw. CJ
I love the clutch btw. CJAs far a driveline wear is concerned, this car is not a drag car- only used for road racing/HPDE events.
Gene
11-25-04, 12:32 PM
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Originally Posted by Jason
Maybe Ralph can answer this question, but why is the HP@50 10.00? It should be 11.9 or it will throw the numbers off.
Good numbers though.
Jason
Good numbers though.
Jason
So- I'm not sure. I'll try to ping Ralph for an answer.
Anyone else?
11-25-04, 01:47 PM
#25
Originally Posted by gfelber
That's a good question. This value adjusts for wind and rolling resistance. It obviously varies depending on the car's arodynamics, tire width, compound, etc. I've been looking into this a bit and there seems to be no real consensus on which numbers to use for a particular car. It seems that 10 is perfect for S2000s since stock the numbers corroborate with factory specs (assuming x% driveline loss). Viper guys use 12 due to the car's crappy aero and steam roller tires.
So- I'm not sure. I'll try to ping Ralph for an answer.
Anyone else?
So- I'm not sure. I'll try to ping Ralph for an answer.
Anyone else?
When I got my mustang dyno they give you a tech sheet on every car made for the past 15 years. It gives the weight and the HP@50. I asked the guys at mustang exactly what that was and they didnt go into it, but said to keep it at what the book says. He said it would change the numbers one way or another. When I get time I will test changing that number.
Jason