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Post your chassis dyno HP results compared to 1/4 mi HP calc
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How Accurate is the 1/4 mi HP calculator on the site
The best I've used (very accurate)
45%
 45%  [ 32 ]
Pretty accurate
35%
 35%  [ 25 ]
Way off (not accurate)
18%
 18%  [ 13 ]
Total Votes : 70

Author Message
SMOKEmUP
PostMaster


Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Wed Jul 10, 2002 12:51 pm    Post subject: Post your chassis dyno HP results compared to 1/4 mi HP calc Reply with quote

How accurate is the HP calculator on the site?

Please post your results here only if you've chassis dyno'd your car and then raced it at the track in the same configuration. You must know the race weight, 1/4 mi trap speed, and chassis dyno results. Please use the format below.

Car -
Weight -
1/4 mi trap speed -
Chassis Dyno peak HP -
Calculator predicted result -

I'll start this with my results.
Car - 1979 Z28
Weight - 3940
1/4 mi trap speed - 101.1
Chassis Dyno peak HP - 282 RWHP
Calculator predicted result - 276.5 RWHP


Last edited by SMOKEmUP on Wed May 07, 2003 3:08 pm; edited 1 time in total
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Duner
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100.00 points



PostPosted: Fri Jul 19, 2002 2:00 pm    Post subject: Reply with quote

Wow! I'm impressed.

The calculator was dead on for my previous dyno pulls and the timeslips that went along with them:

'00, Dodge Dakota CC, 4.7 5-speed

Timeslip: 14.63 @ 93.3 mph
Dyno'd: 233.1 rwhp & 313 rwtq
Weight: 4225 lbs
Predictor: 233 rwhp & 274.1 fwhp (15% driveline loss)

Timeslip: 14.31 @ 94.5 mph
Dyno'd: 242 rwhp & 322 rwtq
Weight: 4225 lbs
Predictor: 242 rwhp & 284 fwhp (15% driveline loss)

Since then I added a turbo system and haven't been on the dyno yet.

Timeslip: 12.76 @ 107.77 mph (10 psi boost)
Dyno'd:
Weight: 4283 lbs
Predictor: 364 rwhp & 428 fwhp (15% driveline loss)

Gtech time: 12.02 @ 116 mph (14 psi boost)
Dyno'd:
Weight: 4283 lbs
Predictor: 453 rwhp & 534 fwhp (15% driveline loss)

I'll check back after getting some real dyno numbers!
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dvs_prelude
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100.00 points



PostPosted: Thu Aug 08, 2002 8:17 pm    Post subject: Reply with quote

97 Honda Prelude SH Turbo
9 pounds boost

Timeslip: 13.42 @ 107mph
Dyno'd: 267.4whp
Weight: 3240
Predictor: 269whp with a 20% drivetrain loss!

Pretty damn accurate if you ask me!
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PostPosted: Tue Aug 13, 2002 11:39 am    Post subject: Thumbs down. Reply with quote

car weighs 3812lbs. dynoed 163.5whp ran 15.5 @ 88.5mph

this calculator says I have 179.4whp!

PEAK HP MEANS NOTHING
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86GN
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Joined: 10 Jun 2002
Posts: 290

4042.20 points


1990 Chevrolet Corvette

PostPosted: Tue Aug 13, 2002 4:40 pm    Post subject: Reply with quote

Was the dyno testing done on a Dynojet or another type dyno ?
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tony.k
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PostPosted: Thu Aug 15, 2002 11:11 pm    Post subject: LS1 comparison Reply with quote

Weight = 3700lb
1/4 MPH = 105

Calc said = 363 HP
Actual = 341 HP
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SMOKEmUP
PostMaster


Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Fri Aug 16, 2002 9:56 am    Post subject: Reply with quote

tony.k - I ran your numbers and the calc says 290.8 Rear Wheel HP and 363.5 Crankshaft HP. Where was the actual HP measured, wheels or crankshaft?
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Juicen
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PostPosted: Tue Aug 20, 2002 6:22 pm    Post subject: Reply with quote

Twisted Evil '91 TT Soarer

Weight: 3946 lbs (1790 kg)
Timeslip: 12.825 @ 107 mph (172 kmh)
Prediction: 327.1 RWHP
Actual: 320 RWHP

Close enough for me!

http://qik.hive.net.au/
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95v8s10
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100.00 points



PostPosted: Sun Aug 25, 2002 9:11 pm    Post subject: Reply with quote

'95 chevrolet s10

Weight: 3540
Timeslip: 13.08@108 mph
Prediction: 302.8 rwhp
Actual: 300.8 rwhp 308.4 rw lb/ft torque
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PostPosted: Wed Aug 28, 2002 12:30 am    Post subject: Reply with quote

Well, here goes, i'm the one to throw off the accurracy curve, but number's first, reasons later:

Weight: 4400
1/4 MPH: 95.79
RWHP Calc.: 262.6
RWHP Actual (Mustang Dyno): 312.3

Well, my best pass is a 13.819 @ 95.79 mph. Also, my RWTQ is measured at 383.9 ft-lbs. She pulls 1.9's in the 60 foot. My vehicle is a 1972 dodge van with the aerodynamics of a brick, and I think this is what lowers my trap speed a bit, despite the numbers she runs. On the ET calculator it predicted approx. 329.5 rwhp, so a bit high but closer. Oh well. I assumed 20% drivetrain loss.

Feel free to check her out (her name is "Tigerlilly") at: http://www.concentric.net/~Aliko
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SMOKEmUP
PostMaster


Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Wed Aug 28, 2002 1:27 pm    Post subject: Reply with quote

Tigerlilly... I checked out your page and from what I read your chassis dyno numbers are all over the place. A high of 390 HP and a low of 279 HP with no major changes to the combination.

I'll bet you surprise the hell out of a lot of people with that van. Very Happy
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Guest






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PostPosted: Thu Aug 29, 2002 1:15 am    Post subject: Reply with quote

The high of 390 was from a year before and it turns out the guys were trying to calculate flywheel horsepower (they did a drive-train loss thing before the runs). The ones that are just rear wheel horsepower on 2 different occasions came out to 280-296 rwhp, then 2 months later, and an oil change (was a little over due the first time i ran it and it was in early february, vs. a fresh oil change and it was end of april 2nd time) she put out 311 and 312 rwhp through the mufflers back to back. I was a bit surprised myself, but I cracked the 13's for the first time this year (had a previous best of 14.03) with a little jet tuning on the carb. 13.9's are the normal all things being equal. And yes, most people are suprised when a 4000+ lb. van blows their doors off stop light to stop light. She's a daily driver and has over 30k miles on the engine so far. Very Happy
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SMOKEmUP
PostMaster


Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Thu Aug 29, 2002 10:04 am    Post subject: Reply with quote

What kind of oil are you using? 15 - 30 HP from an oil change is sweet Razz . All kidding aside 15HP - 30HP is 5%-10% in power numbers, that's a large variance.
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PostPosted: Fri Aug 30, 2002 1:33 am    Post subject: Reply with quote

well, i run valvoline standard 10w-30 actually. But I think the power difference can be explained by this:

the 279 rwhp number (the lowest one) was my first pull and she belched black smoke and was still a little "cold." The next 3 pulls in a row that day were 292, 296, 296. Between the oil change and better weather conditions a gain of 16 hp from 296 to 312 doesn't seem that huge really. It was overcast the first day and more humid, the sky was clearer and it was still fairly cool the 2nd time with less humidity. So a 5% change seems possible. Not sure how else to explain it, lol. I put more stock in my track times than my measured horsepower anyway.
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gotswrv
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Joined: 17 Sep 2002
Posts: 2

100.00 points



PostPosted: Tue Sep 17, 2002 4:11 pm    Post subject: Reply with quote

Hey guys I'm a newbie. Been passing through for about 1yr using the calculators thought I'd stop by and check out the BB.

Anyway, I just ran the calculator. It's way off. It said I should have 188.9HP. The local chassis dyno clocked it at 187.2HP. Wink
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