RWHP/FWHP and E/T thread
#2287044
04/13/17 02:26 PM
04/13/17 02:26 PM
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Joined: Oct 2008
Posts: 370 Suffolk County, New York
1mean340
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OP
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Suffolk County, New York
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Thought it would be interesting to put a thread together for those who have the 'big picture', or at least most of it in regards to the specs of their car.
I think it would be great to see ACTUAL (dyno, not guesswork) HP numbers, either to the wheels or at the crank, race weights and maybe even gearing along with your best E/T's.
I know the calculators do a decent job, but I have seen cars run a lot better than what the calculators say (and some worse).
Just list
RWHP or FWHP Best E/T Race Weight Any other info that may be pertitnent (gearing, tire size etc..)
Who wants to start?!
Last edited by 1mean340; 04/13/17 02:29 PM.
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287051
04/13/17 02:34 PM
04/13/17 02:34 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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3755#s 440 E-body w/ driver (track’s digital scales) - 10.57 @ 126.0 w/ 1.46 60-ft (best of 10.52 @ 126.5 w/ 1.45 60) - Calculated HP for weight & 126.0 MPH = 586 - Actual engine dyno flywheel ~610 HP & 570 torque (estimating 4% loss from 610 to 586 for full exhaust, alternator, etc.)
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Re: RWHP/FWHP and E/T thread
[Re: BradH]
#2287060
04/13/17 02:50 PM
04/13/17 02:50 PM
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Joined: Oct 2008
Posts: 370 Suffolk County, New York
1mean340
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BradH, What calculator did you use? The one I have always used here https://robrobinette.com/et.htm shows you needing 740FWHP to run a 10.5. I used to use the Moroso slide rule , but nobody I knew ever seemed to agree if it was actual RWHP or engine HP you were using to calculate E/T LOL Seeing your numbers gives me hope that 675+ FWHP in my E body that weights hopefully under 3550 race weight could run a high 9.
Last edited by 1mean340; 04/13/17 02:50 PM.
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287061
04/13/17 02:53 PM
04/13/17 02:53 PM
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Joined: Jan 2003
Posts: 13,375 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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340 RWHP 11.87 at 112 mph, 7.54 at 91.2 mph 1/8 mile 3700 lbs. w/ driver 448" wedge N/A w/ 727, 3.91 gear, 26x10 tire
508 RWHP on the local Dynojet chassis dyno 10.40 at 129 mph, 6.62 at 104 mph 1/8 mile 3700 lbs. w/ driver 446" wedge N/A w/ 727, 4.10 gear, 28x10.5 tire
634 RWHP on the same dynojet 9.54 at 140.4 mph, 6.05 at 112.9 mph 1/8 mile 3800 lbs. w/ driver 572" hemi N/A w/ 727, 4.10 gear, 295-65 drag radial (30x10)
Last edited by an8sec70cuda; 04/13/17 03:34 PM.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287076
04/13/17 03:16 PM
04/13/17 03:16 PM
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Joined: Jan 2003
Posts: 6,266 Renton Washington
Triple Threat
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master
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Renton Washington
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515 RWHP 10.11@132,6.42@107 3450# w/ driver 392" G3 Hemi, 4.10 gear, 325/50/15 radial
-Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287077
04/13/17 03:16 PM
04/13/17 03:16 PM
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Joined: Aug 2011
Posts: 2,865 Pattison Texas
CSK
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master
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Pattison Texas
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BradH, What calculator did you use? The one I have always used here https://robrobinette.com/et.htm shows you needing 740FWHP to run a 10.5. I used to use the Moroso slide rule , but nobody I knew ever seemed to agree if it was actual RWHP or engine HP you were using to calculate E/T LOL Seeing your numbers gives me hope that 675+ FWHP in my E body that weights hopefully under 3550 race weight could run a high 9. The Moroso one is Crank HP
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287101
04/13/17 03:45 PM
04/13/17 03:45 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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BradH, What calculator did you use? The one I have always used here https://robrobinette.com/et.htm shows you needing 740FWHP to run a 10.5. I used to use the Moroso slide rule , but nobody I knew ever seemed to agree if it was actual RWHP or engine HP you were using to calculate E/T LOL Seeing your numbers gives me hope that 675+ FWHP in my E body that weights hopefully under 3550 race weight could run a high 9. http://www.moparts.org/Tech/tech/index.htmlI use the "Quarter Mile HP" calcuator there, which generates #s identical to my Mr. Gasket Hot Rod Calculator. I've always believed it's flywheel HP, since the #s are right in line w/ Dwayne Porter's dyno where my engine was tested the last two times. However, those engine dyno #s could be very different for the same engine run on a different dyno, so they're only relative to THAT dyno, IMO. You can't estimate HP from ET. I can have a totally hosed 60-ft due to tuning issues, but the car will still MPH pretty much the same. The ET for any given MPH is an indicator of how well the chassis, converter, etc., are sorted out. The MPH tells you how much "oomph!" the engine is making to push a car that weight to the observed MPH. NFW my car made anywhere near 700 HP, regardless of what that HP for ET calculator claims.
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287119
04/13/17 04:30 PM
04/13/17 04:30 PM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
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UK
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I always used> http://www.wallaceracing.com/accel-calc.phpwhich I assume to be Fly hp according to my old actual track slips> 3000lbs '69 Cuda, stock 440SP block, 9.8:1, solid cam/2.14 906's, 850DP, 2" f/wells etc. best was 10.7@124.8 = 484 fwhp 3550lbs '71 Cuda, stock 340, .484/284 hyd. HSD intake 750DP, hdrs etc. ran a best of 13.29@101 = 300 fwhp Same car with .590/312 solid, 850DP, lower gears better conv, race hdrs ran a best of 12.49@107.6 = 360fwhp all these figures seem reasonable to my motor specs and fwhp numbers. Only thing with Wallace is that if you get into the very light cars or S/SS cars the numbers seem to go way out.
Last edited by rb446; 04/13/17 04:31 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287161
04/13/17 06:01 PM
04/13/17 06:01 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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I Live Here
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So. Burlington, Vt.
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I consider the Moroso slide rule to be the default "target" for performance....... IF the dyno numbers aren't BS.
A really well sorted out car can surpass the Moroso slide rule, but most won't.
From my experiences, if you have pretty accurate engine dyno data, you should be able get the hp number on the Moroso slide rule to come within about 5-7% of your corrected hp, based on speed. This assumes you're not running at altitude adjusted tracks.
For example, if you have a 500hp motor(std corrected hp), and put it in a 3600lb race weight car, you should be able to get it to go between 119(465hp) and 121.8(500hp)mph.
If after trying to get the combo sorted out it still won't go at least the 119, and you're not running at an altitude track, you have to start considering the dyno numbers might be a little optimistic.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: RWHP/FWHP and E/T thread
[Re: fast68plymouth]
#2287204
04/13/17 07:17 PM
04/13/17 07:17 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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I Live Here
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I put 478 at the tires and went 9.79 first 1/4 pass ever.........3200+ 4.10's and a 29" Hoosier through the muffs...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287380
04/14/17 12:12 AM
04/14/17 12:12 AM
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Joined: Jan 2003
Posts: 4,448 Phoenix, AZ
MoparBilly
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Phoenix, AZ
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Directly from the Wallace calculator:
The answers below will be for at sea level and standard pressure/temperature. (no weather correction).
How many of you have raced at sea level? How many of you know how to make an accurate weather correction? Just checking.
My 428 small block made 615 hp and 565 torque on it's best pull on IMM's dyno. We promptly removed his 1000 CFM Holley 4150, and I bolted on a 950HP when I got home. I put it in my 3150lb 62 Valiant street car, with an 8" JW converter, low gear set 904, and 3.89 gear with 30" tall ET Streets.
In the last three years, I've only managed 33 engine passes at various tracks and thirteen bottle passes.
Best engine pass is 10.396-128.27 on a hot September afternoon at Indy, and I think the DA was 4500ft.
Best nitrous pass is 9.65-138 at National Trail, again on a eighty degree day, but I'd be lying if I threw out a DA number.
"Livin' in a powder keg and givin' off sparks"
4 Street cars, 5 Race engines
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2287479
04/14/17 03:42 AM
04/14/17 03:42 AM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
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Posts: 9,225
Charleston
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548 rwhp dynojet 3100lbs 9.85 @ 135 428 g3 8" 5300 3.73 28" tire
Last edited by sixpackgut; 04/14/17 03:43 AM.
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: RWHP/FWHP and E/T thread
[Re: sixpackgut]
#2287607
04/14/17 12:12 PM
04/14/17 12:12 PM
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Joined: Jul 2005
Posts: 336 Creston, Iowa
340man4ever
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enthusiast
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Creston, Iowa
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Motor dynoed 560 HP at the crank
1974 Dodge Dart 2dr 3300lbs at the line.
440 zero decked w/flat top pistons. Ported 915 heads flow 268/207 peak. 11.25:1 Compression
Mopar 590 Solid Cam
850 HP carb, M1 intake, McCandless/ ProParts Headers
727 trans w/ Dynamic 9.5 converter (hi gear flashes 5100) 4.30 gear, 30x9 slicks
Footbrake @ 1800rpm shift at 6200
Ran:
10.77 @ 122.8 mph 1/4
1.47 60 ft 6.80 @ 99.79 1/8th
Curator at Adams County Speed Shop
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Re: RWHP/FWHP and E/T thread
[Re: Thumperdart]
#2287690
04/14/17 02:47 PM
04/14/17 02:47 PM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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I put 478 at the tires and went 9.79 first 1/4 pass ever.........3200+ 4.10's and a 29" Hoosier through the muffs........... Thats a very conservative rw dyno 3200/670fwhp = 9.81@137
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: RWHP/FWHP and E/T thread
[Re: 1mean340]
#2288170
04/15/17 12:41 PM
04/15/17 12:41 PM
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Joined: Jul 2004
Posts: 1,145 Arizona, USA
gsmopar
super stock
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super stock
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Arizona, USA
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RWHp: 373hp (N/A) Best E/T: 10.66 @ 126.4mph Race Weight: 3839lbs '69 Charger, 440, OOTB Performer Edelbrock, .590 purple shaft, ~170hp Nitrous. Tire shake on the dyno. I don't think the numbers are too accurate.
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