Home | Register | Login | Contact Us

 
Auto Math
Classifieds
Forum
Gallery
Games
Garage
Tech Articles
Utilites
 
FAQFAQ    SearchSearch    RegisterRegister    Log inLog in    Log in to check your private messagesLog in to check your private messages    Forum Subscriptions1/4 Mile Table 

Post your chassis dyno HP results compared to 1/4 mi HP calc
Goto page Previous  1, 2, 3, 4
 
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Everything Goes
View previous topic :: View next topic  

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
Harold Sutton
Member


Joined: 30 Nov 2003
Posts: 85

2764.18 points


1970 Chevrolet Chevelle

PostPosted: Fri Apr 09, 2004 2:34 pm    Post subject: Reply with quote

86GN, the turbo cars are definately the most streatable of all the power adders. The best of both worlds, mild enough to drive and fast as hell. I'd like to do one someday. Your only limited by the strength of you parts, fuel injection system, waste gate ( hopefully adjustable ) and common sense. I do know a young man whose boost got too high and split the block in half dumping half the motor and the tranny into the street. It was a stock block and got 26 pounds of boost for a very short time.
Back to top
View user's profile Send private message
cjpp78
Newbie


Joined: 21 Apr 2004
Posts: 1

100.00 points



PostPosted: Thu Apr 22, 2004 2:50 pm    Post subject: Reply with quote

89 supra turbo

weight with driver 3810

dynoed 257 rwhp & 301pft

calculator 240rwhp

quarter 14.1 @ 98mph
Back to top
View user's profile Send private message
korvetkeith
Newbie


Joined: 15 Oct 2005
Posts: 1

127.50 points



PostPosted: Sun Oct 16, 2005 11:13 am    Post subject: Reply with quote

ta88gta wrote:
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.


I seriously doubt your TA weighs 3360 with you in it. Did you weigh it at the track or are you using a number you found.
Back to top
View user's profile Send private message
M-Phibian
Newbie


Joined: 01 Oct 2003
Posts: 1

130.96 points



PostPosted: Tue Mar 21, 2006 8:22 pm    Post subject: Reply with quote

VERY accurate.

My 2001 Porsche Turbo dyno'd at 575rwhp at 1.3 bar (18.8 psi) on a Dyno-Dynamics dyno, and 600rwhp at 1.4 bar (20 psi).

I took the car to the track and ran a 10.65 @ 136 mph at 1.3 bar...and the calculator says I should have 585rwhp. That's only a differnce of 2%. Amazing!
Back to top
View user's profile Send private message
Teruell
Newbie


Joined: 25 Sep 2005
Posts: 9

440.02 points


1993 Mazda RX-7

PostPosted: Thu Oct 12, 2006 7:41 pm    Post subject: The Calculators are damn near perfect. Reply with quote

We use a AWD Mustang 500 DE dyno here at the shop.
We have a DOT weigh scale 5 minutes away to weigh the vehicles.
So far every car I have dyno'd (uncorrected #'s, your timeslips aren't corrected to sea level so why should your dyno results be?) has been spot on with performance @ the track using the calculators @ Smokemup.com.
Car: 1991 Eagle Talon AWD
Dyno results:410 Average four WHP through the powerband the car experiences while racing. 5500-7500 RPM. Peak power of 422 four WHP.
Weight:3140 w/driver in race trim.

Results: 125 MPH.

Calculator says 416.4 whp is needed to achieve that MPH.
Dyno reads an average of 410 through the powerband the car see's on the track with a peak of 422.

"The best calculator on the web bar none" - Cheers.

Blaine B.
Wastegates are for sissies.
www.subracing.com
Back to top
View user's profile Send private message
soros151
Newbie


Joined: 14 Nov 2006
Posts: 1

128.84 points



PostPosted: Thu Dec 14, 2006 12:24 am    Post subject: Reply with quote

Pretty Accurate

My car: Scion tC 06
Dyno Jet: Correction Factor 5
160whp/162wtq
ET 1/4: 15.43 @ 89.96mph
Weight: Around 3066 w/ Driver and weight reduction at back.
15% Drivetrain Loss

_________________
Either u do it or u don't. No regrets.
Back to top
View user's profile Send private message
94ttss
Newbie


Joined: 12 May 2003
Posts: 1

128.00 points



PostPosted: Fri Sep 07, 2007 9:24 pm    Post subject: Reply with quote

Car - 2002 Ford F350 crew cab short bed
Weight - 8050
1/4 mi trap speed - 102.56
Chassis Dyno peak HP - 593
Calculator predicted result - 589
Back to top
View user's profile Send private message
Chunnetter
Newbie


Joined: 20 Jun 2011
Posts: 3

190.06 points



PostPosted: Mon Jun 20, 2011 6:50 am    Post subject: 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.
_________________
*** Sig Removed, see rules ***
Back to top
View user's profile Send private message
Knarley Darley
Member


Joined: 22 Apr 2004
Posts: 1247

540238.26 points



PostPosted: Wed Jun 22, 2011 12:13 am    Post subject: Reply with quote

I calculated from 1/8th mile trap speed
weight 3250
speed 125
calculators estimated power =
862 rear wheel- actual was 864 dynoed
crankshaft estimated 1077.5 actual was 1072 at the crank on the engine dyno. That is pretty dang close.
When I calculated from E.T. and car weight it was almost 100 horsepower to high, but your trap speed calcs are very good. The nice thing about speed, is it is hard (impossible actually) to run faster without more power, but you can run quicker with better traction, higher rpm launch ect. thus the big discrepancy using E.T. and weight. You can actually spin bad have a much slower than normal E.T. and still run almost the exact same speed. Basically when tuning at the track, if the car traps at a higher speed, it had to make more power regardless of E.T. Once tuning doesnt produce any more speed, then you work on getting the car to leave as hard as possible to produce the best E.Ts
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Everything Goes All times are GMT - 5 Hours
Goto page Previous  1, 2, 3, 4
Page 4 of 4

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
Home | Contact Us | Automath | Cam Files | Dyno Search | Forum | Garage | Picture Gallery | Reaction Timer

Copyright 1997-2016 SMOKEmUP.com All rights reserved.
Advertising Info     Disclaimer     Privacy Policy