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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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jjrocks
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Joined: 10 Oct 2003
Posts: 1

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PostPosted: Fri Oct 10, 2003 8:42 am    Post subject: Reply with quote

I have a dybo tune chart 303 rwhp from Pauls High Performance.
I have time slips of 12.91 @108 mph
The calculator was scarry accurate

Jim
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jdaniel
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Joined: 12 May 2003
Posts: 1

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PostPosted: Tue Oct 14, 2003 6:56 pm    Post subject: Reply with quote

I've got a 96 Dodge Ram 1500 fullsize 8' bed 318. Race weight is 4650lbs. The Dyno I got was 11HP higher than your calculator. Probably because my pickup is far less aerodynamic than a typical car. The dyno machine was suppose to be one of the most accurate. They took my tires off and bolted up to it.

Yours was much more accurate than other calculators I've used. Others said I had about 260 to the tires were yours said 226. Since I ended up with 237.4, I'd have to say yours calcs are much more realistic.

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Dodge Ram 1500
4,700 pounds
14.7@91MPH
5.2 (318) 5-Speed Headers, JetChip stage II, MagnaFlow 3" Cat Back, 1.7 Racing Rockers, Jet TB Spacer, MSD6al, BFG 315 Drag Radios, K&N ColdAir, and Electric Fans
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Rascal
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Joined: 04 Jul 2003
Posts: 92
Location: VA
118.00 points



PostPosted: Sat Oct 25, 2003 1:44 pm    Post subject: Reply with quote

Great idea...something I'd been working on but ran into some time issues...lol

I think...with enough data...it may teach us something about how "off" typical chassis dynos are in relation to loads presented under racetrack use...it'll also point to what's important when it comes to power and acceleration...

and...highlight just how much torque it takes to work a chassis/suspension...in order to control torque introduction...Great work...Rascal

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Race the track...not the dyno.....Rascal
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EricTheBald
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Joined: 10 Nov 2003
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PostPosted: Mon Nov 10, 2003 11:46 pm    Post subject: Reply with quote

This calculator was off by 3.4hp compared to a dyno run I did a couple of weeks ago.
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KPersimmon
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Joined: 05 Dec 2003
Posts: 1

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PostPosted: Sun Dec 07, 2003 12:34 am    Post subject: Reply with quote

{Post withdrawn}

Last edited by KPersimmon on Wed Jan 28, 2004 10:20 pm; edited 1 time in total
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Harold Sutton
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Joined: 30 Nov 2003
Posts: 85

2764.18 points


1970 Chevrolet Chevelle

PostPosted: Sun Dec 14, 2003 12:51 am    Post subject: Horsepower from MPH. Reply with quote

We have had my sons 540 Big Block powered Chevelle on the Dynojet several times and the results were very close to your predictors. The car made 642&646 RWHP on one and 636 with no second pull on the other and generally runs 138 MPH trap speeds in average air. Pretty darn close i'd say.
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BowtieNut
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Joined: 26 Jan 2003
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PostPosted: Wed Dec 24, 2003 8:47 am    Post subject: Reply with quote

Motor only:
4050 lbs
104.63 mph
Your calculator: 315 rwhp
Dynojet (Std correction): 309 rwhp
Very accurate, considering my mph was in better than "standard" conditions.

150 shot:
4150 lbs
113.5 mph
Your calculator: 412 rwhp
Dynojet (Std Correction): 425 rwhp
Again, very accurate, considering I shut the juice off during shifts.

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Pat Gish
1996 ImpalaSS with stock cam and heads.
Motor: 12.90 @ 104.6 mph
150 shot: 11.91 @ 113.5 mph
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JoshC
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Joined: 04 Jan 2004
Posts: 1

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PostPosted: Mon Jan 12, 2004 7:11 am    Post subject: HP ??????????????? Reply with quote

I think the reason why the numbers can vary so much especially with the heavier cars is that HP has far less to do with 1/4 mph's and ET's than torque. Heavier cars need alot of torque to get them to accellerate. Just my 22 cents worth.


Josh
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Hellonweelz
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Joined: 30 Oct 2003
Posts: 1

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PostPosted: Thu Jan 22, 2004 6:48 pm    Post subject: Reply with quote

292 actual RWHP on a dynojet. Best ET and trap 13.92 @104. Result from calculator=288.7 rwhp. based on 15% Fbody drive train loss. Pretty damn close.
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CumminsGuy
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Joined: 15 Sep 2003
Posts: 3
Location: Macon, GA
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PostPosted: Fri Jan 30, 2004 5:38 pm    Post subject: Reply with quote

Well I got a 1998 Dodge Ram 2500, Cummins Turbo Diesel. Tips the scales at 6500 and change depending on fuel, random crap in the toolbox, etc. When I dyno'd on a dynojet 248c I put down 447HP and 940ft-lbs. I run a 13.7 @ 101.08, and your calculator puts me at 455. Not too shabby I would say Cool
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powerstroke racer
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Joined: 14 Feb 2004
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PostPosted: Sat Feb 14, 2004 6:19 pm    Post subject: Reply with quote

2000 F 350 Crew Cab single wheel 7200lbs race weight
Track times average 13.50's@101
Dynojet 248c says 477-482 depending on engine oil temp
Calculator Say's 503.7 rwhp
I'd say that's pretty accurate as the intercooler is working at speed
and is not doing much sitting on a dyno with no airflow acrossed it.
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melon
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Joined: 17 Feb 2004
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PostPosted: Tue Feb 17, 2004 6:13 pm    Post subject: Reply with quote

Car
-HOnda Civic NA drag
-160 kw/208 hp @ wheels
-1750 pounds!
-12.9 @ 108 mph
-15% loss (front wheel drive)

calculated at only 160 hp?

Confused
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89tta
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Joined: 08 Feb 2004
Posts: 1

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PostPosted: Wed Feb 25, 2004 10:45 pm    Post subject: dyno Reply with quote

89 turbo Trans am
3500lbs
used a dynojet and made 378.9 at the rear wheels and i run 12.2 at 117.
I used your mile per hour in 1/4 and it came up with 380.1 so thats darn close.. Very Happy
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biggtime
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Joined: 13 Jul 2003
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PostPosted: Sun Mar 28, 2004 9:08 pm    Post subject: Reply with quote

It took me a while since I Dynoed my car, but i finally got to the track. Scary close calculater. I made 435 RWHP on a dynojet. Went to the track today went 11.08/121.14. my car weighs 3650lbs with me in it. the only thing I did since the dyno pull was a xpipe. your calculater said 440.6. I would say dead on! Thanks, Bob

www.bigtimeauto.com/gallery
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86GN
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Joined: 10 Jun 2002
Posts: 290

4042.20 points


1990 Chevrolet Corvette

PostPosted: Sun Mar 28, 2004 11:19 pm    Post subject: Reply with quote

Here's one for ya. Went to the dyno with the T-type today. Best pull was 822 rwhp. The car weighs 3350 and has been 121.5 in the 1/8th and 151.7 in the 1/4. The actual tune that had previously been 149 was only good for 720 hp. I had to seriously lean out the tune to achieve the peak numbers, but the peak numbers fell right in line with with what the 1/8th mi MPH predictor came up with.

A dynojet tune and a track tune are two completely different things. I had to lower the VE numbers on my FAST program by 15% to lean out the tune to where the A/F numbers fell in line with what I tune for on the track. Seems like turbo cars are really bad about this. Not enough load on a dynojet. Same deal with nitrous.

Just food for thought.
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