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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

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supergonzo
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Joined: 12 Sep 2002
Posts: 1

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PostPosted: Sun Sep 22, 2002 6:00 pm    Post subject: horsepower calculator Reply with quote

It is pretty accurate, if you have a stock muscle car or later stock performance car, set the drivetrain loss to 21% and the number will be accurate within 5 hp it looks like.

11 second or better cars should use a lower drivetrain loss, depending upon combination

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bugsquawsher
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Joined: 21 Nov 2002
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PostPosted: Thu Nov 21, 2002 6:13 pm    Post subject: Reply with quote

Very Nice Calculator you have there
I got a new best time at the track last night
I ran the calculations from that
I dynoed the car today
Your calculator said 336.2 Hp
My two Dyno runs were
334.2 and 338.9
You think you can get any closer???
Tom

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2001 Z-28 Lid,K&N,Custom home made MAF ends,B&M ripper, Random Tech Muffler.
Best time 12.7 @111
Dynoed 338 hp at 359 ft-lbs


Last edited by bugsquawsher on Fri Nov 29, 2002 9:14 pm; edited 1 time in total
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Janders
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Joined: 29 Nov 2002
Posts: 1

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PostPosted: Fri Nov 29, 2002 8:24 pm    Post subject: Reply with quote

Car - 3.0L 1991 Nissan 300zx NA V6
Weight - 3360
1/4 mi trap speed - 95
Chassis Dyno peak HP - 194
Calculator predicted result - 198
MPH calculator was very accurate, the 1/4 ET gave me 7 more hp(205)
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lenweiler
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Joined: 16 Dec 2002
Posts: 10
Location: Walkerton, Ont. Canada
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PostPosted: Fri Dec 20, 2002 9:28 am    Post subject: New postee Reply with quote

Using the PC programs from Mr Gasget my time came in spot on. But I found I had to be HONEST, with the info.
Car: '69 Dodge Super Bee
Weight: 3850 lbs. with driver
Tires: 28.5" eagle st's Gear: 3.55:
Engine: 451 cu. in. with 420 hp. and 465 lbs. torque (PC program)
ET: 12.87@107.7 MPH
This program was within .010 of a sec.

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86GN
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Joined: 10 Jun 2002
Posts: 290

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1990 Chevrolet Corvette

PostPosted: Sat Mar 01, 2003 8:04 pm    Post subject: Reply with quote

I took the T-type to the dyno today. With the car exactly the same as the last time out at the track, no tuning changes, nothing, I got 597 rwhp.

Previously the car ran 9.97 @ 135 mph, 110 mph in the 1/8th. It weighed 3380 on the Etown scale. It looks like the 1/8th mile mph calculator might he a little more accurate. My guess would be wind resistance.

With tuning and some more boost I was able to get 651 rwhp today.
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DantheMan
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Joined: 07 May 2003
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PostPosted: Wed May 21, 2003 8:46 pm    Post subject: Reply with quote

Car - '99 Trans Am
Weight - 3550
1/4 mi trap speed - 110
Chassis Dyno peak HP - 317
Calculator predicted result - 320

Not bad!
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Scheissmeisser
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Joined: 29 May 2003
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PostPosted: Fri May 30, 2003 2:19 am    Post subject: Reply with quote

2002 C32 AMG
3850#
106 mph trap speed
20% drivetrain loss

The factory rates this puppy @349 HP.(German horses are bigger?)... the program says 389 at the crankshaft.Not too far off.I'm looking for a chassis dyno,and will post my results.For those that need to know,my best ET so far is 13.6...pathetic 60' times...and the car is stock.
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analyte
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Joined: 13 May 2003
Posts: 1

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PostPosted: Sun Jun 08, 2003 9:40 pm    Post subject: Reply with quote

okay here are my numbers:

66 Chevelle BB
weight 3841 lbs.
12.893 @ 110.44 mph (60fts suck at 2.32!)
25% drivetrain loss with Th400 and 12 bolt


Chassis Dyno #'s:
344.8 rwhp at 5000rpm
465.1 rwtq at 3600rpm


Calc shows:
351.3 rwhp using mph
468.4 hp at crank

354.2 rwhp using et
472.3 hp at crank using et


Is the correct way to determine hp at crank is to determine what number minus 25%, in my case, equals the rwhp number? I have been taking 25% of the rwhp number and adding that with the rwhp number to determine crank power. Have I been doing it backwards? Also, does torque work the same way in figuring at crank?

Thanks, awesome calc. Feel it should have more in it with more tuning so I hope I get closer to the calc's numbers. Very Happy

Kerry
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Unlawfl
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Joined: 14 Jun 2003
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PostPosted: Thu Jul 31, 2003 1:39 pm    Post subject: Reply with quote

Definately spot on.. I have a 73 Dodge Challenger with a 10.7:1 Edelbrock headed 440. Pump gas car, no power adders.

Last year on a Mustang chassis dyno, it made 420 rwhp and generally went in the 120+ mph range. I did some changes this year and pulled an 11.10 @ 121.4 pass last weekend in bad air. The calculator using trap mph and race weight of 3530 (car is 3300 empty, I'm 230) said 428hp. I believe its darn close if not spot on.
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ta88gta
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Joined: 23 Aug 2003
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PostPosted: Sat Aug 23, 2003 7:19 pm    Post subject: Reply with quote

car: 1988 TransAm GTA
time slip: 12.33@114 (on blad street tires)
weight: 3360lb
Prediction: 343.6rwhp using mph
dynoed : 401.6rwhp

This calculater doesnt seem to be very accurate with my car, but this could be due to the fact that ive never ran the car on slicks or drag radials so i dont really have an accurate time slip. It does run consistant 12.3s on street tires though.
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LG Svensson
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Joined: 26 Aug 2003
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Location: Sweden
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PostPosted: Tue Aug 26, 2003 3:33 am    Post subject: Reply with quote

Here is my numbers

Car Volvo 244 -87 16v turbo

Engine power in Superflow dynotest 529.3 hp


Time slip

ET 10.815
speed 210.69 kmh = 130,94 mph
Weight on raceday 2962 lbs

Smoke m up: Crank 531,9 hp (15% drivline loss)
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DIRep972
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Joined: 08 Sep 2003
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PostPosted: Mon Sep 08, 2003 11:14 pm    Post subject: Re: Post your chassis dyno HP results compared to 1/4 mi HP Reply with quote

i did the calculator and it was way off for me.

Car: 95 Acura Integra Turbo

Time Slip
-12.9 @ 109mph (street tires/fwd)
-2750lbs wieght on raceday
-274whp/237ftlbs @ the wheels on a DynoJet dyno

Smokeemup Calculator:

@ Drivetrain Loss - 20 (%)
-Rear Wheel HP - 241.8
-Crankshaft HP - 302.3
-Power to Weight (rwhp) - 11.4 (lower is better)
-Power to Weight (crank hp) - 9.1 (lower is better)

It looks to me that the hp/trap speed calculator is more accurate on cars that make alot more tq. then hp.
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wrathchild
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Joined: 01 Oct 2003
Posts: 1

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PostPosted: Wed Oct 01, 2003 9:45 pm    Post subject: Reply with quote

New here so hi to everyone.

Now. When i first got my motor together i ran 103 mph traps and i had the car dynoed and it was 272 rwhp. Since then i have got the car to 109 traps.

Now if where i weighed my car is correct (3190 with me in it) I am still dynoing close to my original numbers.

So do you think my wieght isnt right? It was a tractor trailer scale at a truck stop.
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osmiumfoot
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Joined: 11 Jun 2002
Posts: 299

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PostPosted: Thu Oct 02, 2003 1:49 pm    Post subject: Reply with quote

Chassis dyno - 307.6 hp
Auto math using trap speed - 329.6 hp

As discussed in other posts, either the 20% dt loss isn't valid or the shop where I dynoed isn't valid.
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87Fake
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Location: S.A. Texas
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PostPosted: Sun Oct 05, 2003 5:51 pm    Post subject: Reply with quote

Pretty darn close!

Car info: 3560# race weight, 106.68 mph, 25% loss

Calculator= 293.5 rwhp

Actual= 294.8 rwhp

Very Happy

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