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I honestly am considering selling my car. All i ever hear from peop is how its not 500hp. I mean i trapped 125mph with a 2.91 60' time to me thats pretty impressive
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Put it on a dyno and see haha
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Thats all everyone wants it seems like. kinda like our crx drag car running 10.3 @ 141 with a 1.6' and yet people still talk shit. It never ends
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silver and tom what are your 1/8th mile trap speeds?
its tough to compare dynos from different areas. i only made 525whp and i trap 140mph in the 1/4. this is also on a dynojet. |
Originally Posted by silverfdturbo6port
(Post 10991608)
I honestly am considering selling my car. All i ever hear from peop is how its not 500hp. I mean i trapped 125mph with a 2.91 60' time to me thats pretty impressive
Originally Posted by smg944
(Post 11012657)
silver and tom what are your 1/8th mile trap speeds?
its tough to compare dynos from different areas. i only made 525whp and i trap 140mph in the 1/4. this is also on a dynojet. |
my best trap speeds were 108 in the 1/8th and 133 mph. Maybe I can do better this year now that I have a large 1.32 A/R divided turbine housing that is helping to keep that power staying up around 528-532 all the way to redline. 140 is really fast, 60 FT time?
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Yea it moves really well. It's always been a really strong top end car. I was running Hoosier tires at the track. Also my 60ft are 1.8 or 1.9 I come off the line like a baby slide clutch around 4k with no 2 step.
Tom you have a pretty high 1/8 trap speed avg gap from 1/8 to 1/4 is around 28-30mph. But then again your 60' are so fast that helps the 1/8 |
Also that was at 27psi.
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Originally Posted by smg944
(Post 11012657)
silver and tom what are your 1/8th mile trap speeds?
its tough to compare dynos from different areas. i only made 525whp and i trap 140mph in the 1/4. this is also on a dynojet.
Originally Posted by GoodfellaFD3S
(Post 11012793)
You're selling the car because people don't think it's fast enough :confused:
It would be like worrying how does a car making 411 on the twins trap 128 but with a extra 100hp on a single traps 3mph faster and thats it. but we dont have all the answers and we all dont make "perfect" runs to compare with. The drag scene is a joke now days. Time to check out DGRR one of these times and get back into the real reason for owning a rotary. |
I've had a friend who made 432whp on the local dynojet and made 440whp on a mustang dyno which is known to be the lowest reading dynos. Always use 1/4 trap speeds or 60-130 vbox times to measure you cars actual power. Going by both my trap speed and my 60-130 mph gap I should technically dyno around 600whp
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Here is a great calculator I use. My car weights 2760 with me in it. Trap speed of 139.88 ends up with just under 590whp. Just always use trap speed to get an accurate number.
http://www.ajdesigner.com/phphorsepo...horsepower.php |
I've had both terrible 2.4 60' and decent 1.7 60' times and the trap speeds have always been within 1-2mph. It basically works by distance rather then time that's why trap speeds don't fluctuate too much.
Silver what did you dyno btw? |
i dyno'd on a dynocomp dyno which is garbage. it said 535 on 21psi on a 6765 turbo two years ago. id have to say that the dyno is off and inaccurate but non the less all i hear is how my car could only be 350hp using the HP CALCULATOR which cant be correct. my car without me in it weighs 2750 with 1/2 tank of fuel and my setup is nearly identical to yours smg944 as we have talked about in the past on our mods.
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Originally Posted by smg944
(Post 11013128)
Here is a great calculator I use. My car weights 2760 with me in it. Trap speed of 139.88 ends up with just under 590whp. Just always use trap speed to get an accurate number.
Originally Posted by silverfdturbo6port
(Post 11013202)
non the less all i hear is how my car could only be 350hp using the HP CALCULATOR which cant be correct. my car without me in it weighs 2750 with 1/2 tank of fuel
Many people probably believe, that 450whp at 15psi or 500whp at 20psi is benchmark on 13B with modest porting. In reality, such power levels aren't achieved even at crank at such low pressures. https://www.rx7club.com/showpost.php...83&postcount=1 Engine dyno never lies. Or at least, people using it want true numbers. Note that he dynoed "only" 438BHP at 17 psi. Later on healthy engine with T66 turbo, he made 580BHP at 27 psi. Its perfect increase in power with pressure ratio and again, corresponds almost exactly with performance of smg944's car at same boost level. I would say that your car produces about 450-480HP, if you aren't happy with it, just turn up the boost:egrin: Even with all fancy turbo technology, you won't produce much more power at some given boost level, if the conventional piece wasn't at choke at first place. Boost is consequence of mass flow, not vica versa. |
silver, pm me a bunch of info on your car again. i know we had spoke on the anti surge things and a few others. ill try and get you up on the power level. on 21psi my car made 430-440whp. one thing you must do is stick with the same dyno. even if it tells you it makes 535whp at 21psi it wont matter as its just a number and it will go up accoringly as you add the boost in. do you tune your own car btw?
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Originally Posted by silverfdturbo6port
(Post 10991608)
I honestly am considering selling my car. All i ever hear from peop is how its not 500hp. I mean i trapped 125mph with a 2.91 60' time to me thats pretty impressive
2.91 60' ? your kidding right ? |
liborek, the only part i disagree with you on is that most of the dynos do read higher so technically when comparing to other car its tough. this only goes when you car comparing whp on cars. an example is a 750whp porsche 996 turbo will trap 138mph in the 1/4 and run 6.0 vbox. but when you look at power to weight its 4.5 lbs/ 1 whp. so considering my car is similar the online hp calculators are more accurate with 580whp because that would put me at 4.5 lbs/ 1 whp.
in reality the dyno number doesnt matter its what it will 1/4 trap or cover a certain distance in. |
Originally Posted by Liborek
(Post 11013301)
I'm pretty sure that all these calculators are estimating engine power. I would say that your dyno number is "true" and everything else is inflated. 525whp corresponds nicely with 590 HP@crank.
Assuming that race weight is about 2950 pounds, calculator says 450 HP@crank. Many people probably believe, that 450whp at 15psi or 500whp at 20psi is benchmark on 13B with modest porting. In reality, such power levels aren't achieved even at crank at such low pressures. https://www.rx7club.com/showpost.php...83&postcount=1 Engine dyno never lies. Or at least, people using it want true numbers. Note that he dynoed "only" 438BHP at 17 psi. Later on healthy engine with T66 turbo, he made 580BHP at 27 psi. Its perfect increase in power with pressure ratio and again, corresponds almost exactly with performance of smg944's car at same boost level. I would say that your car produces about 450-480HP, if you aren't happy with it, just turn up the boost:egrin: Even with all fancy turbo technology, you won't produce much more power at some given boost level, if the conventional piece wasn't at choke at first place. Boost is consequence of mass flow, not vica versa.
Originally Posted by smg944
(Post 11013373)
silver, pm me a bunch of info on your car again. i know we had spoke on the anti surge things and a few others. ill try and get you up on the power level. on 21psi my car made 430-440whp. one thing you must do is stick with the same dyno. even if it tells you it makes 535whp at 21psi it wont matter as its just a number and it will go up accoringly as you add the boost in. do you tune your own car btw?
Yes i tune my own stuff and am good at it.
Originally Posted by flaco
(Post 11013375)
2.91 60' ? your kidding right ?
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silver, dont worry about running 30+psi the 6765 still works. not sure if you can do it with just water injection. but on the same dyno i use i made 591whp on 31psi with meth and race fuel but the tune was a bit aggressive considering i dont beleive my meth content was high enough. i can see my car making 575whp safely on 30psi.
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Originally Posted by smg944
(Post 11013385)
liborek, the only part i disagree with you on is that most of the dynos do read higher so technically when comparing to other car its tough. this only goes when you car comparing whp on cars. an example is a 750whp porsche 996 turbo will trap 138mph in the 1/4 and run 6.0 vbox. but when you look at power to weight its 4.5 lbs/ 1 whp. so considering my car is similar the online hp calculators are more accurate with 580whp because that would put me at 4.5 lbs/ 1 whp.
We could go further and calculate fuel flow, airflow and guesstimate engine power. Or even few reasonable numbers into turbo calculator reveals what is possible and what not:) I just wonder if your car could be pushed further. I'm pretty sure that compressor is far from choke at 650 HP level and turbine throughput will increase with higher boost->higher rotational speed of assembly.
Originally Posted by smg944
(Post 11013385)
in reality the dyno number doesnt matter its what it will 1/4 trap or cover a certain distance in.
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nice setup,great power!!
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Originally Posted by tom94RX-7
(Post 10823655)
Today I made 528 rwhp 428 ft/lbs torque (SAE 5), 24 psi boost, T04r single turbo, .96 A/R. 850s and 1680s, Aero 340lph pump. Mild streetport engine built by djseven, my tuning, Power FC. 93 pump gas and a AEM WI kit with one coolingmist CM7 super atomizing injector (500cc/min at 150psi) spraying water only, with a 200/250psi new AEM recirculating pump, nozzle near the exit of my greddy 3 row fmic.
At 528 HP my Torque was 403, 6878 rpm, AFR was 11.8 (11.2-11.8 afr across the powerband), leading timing logged at 9 (7 in the map) split 12, knock 4, PIM 26231, 1.59 bar on pfc, inj. duty 80.4 , AirT 23C. http://farm7.static.flickr.com/6096/...45ba1827_b.jpg 200 hp at 4300 rpm. 300 hp at 4700 rpm. 400 hp at 5200 rpm. 500 hp at 6300 rpm. 457 hp at 8000 rpm. My Greddy 3 row fmic worked better this time on the dyno compared to the 2 row fmic when I made 463hp at 21psi. This time my air intake temps went up 13C during the dyno pull, before they would go up 21C degrees, which is a difference of 23 degrees F, nice! At the start they were at 18C (ambient, fraits at the fmic outlet) and went up to 31C, which is 88F. And this time I was running 24 psi boost, last time was 21 psi boost. Ambient air temps basically the same. So more boost and lower AIT = lots more power haha. And my AFR was a little leaner, which makes a significant increase in HP, knock stayed low. Dyno file attached. |
Originally Posted by silverfdturbo6port
(Post 10991608)
I honestly am considering selling my car. All i ever hear from peop is how its not 500hp. I mean i trapped 125mph with a 2.91 60' time to me thats pretty impressive
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It's not an exact science. I did 128.9 mph with stock twins and about 411 rwhp, and I was going 131-133 with a single turbo and about 528 hp. Small difference in trap speed.
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well yea to make over 100hp and only gain 3mph..? And how do you figure that 60' dont make a difference. if you bog and have no boost for 30' then you loose that much track to gain speed. And even at that if you use the so called hp calculator to compare to a dyno Tom94rx-7 still has not hit over 500hp according to the calculator, but we all know that its making 528hp or more. Most dont realize that to get a hp# calculation based on the track run IT HAS TO BE A PERFECT RUN
My last run on 18psi i trapped 120. guess that makes the car like 300hp hehe. never the less i will sort it all out this spring and summer on the dynojet |
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