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04-06-2013, 10:51 PM | #1 |
Scooby Specialist
Member#: 236017
Join Date: Jan 2010
Chapter/Region:
South East
Location: Thomasville, NC
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Horsepower and trap speed relation
I understand all dynos are different and read differently. I understand that they are just a tuning tool and some read lower/higher than others. I see a lot of people saying that if you run it at the track the trap speed will tell you what you're making. So, what is the real relation between trap speeds and horsepower?
I ran my car for the first time today at a local 1/8 mile track. 1.78 60ft time, 7.8 et @ 91. I had a run at 92 mph, but the et was higher. I'm just trying to get a realistic idea of what kind of power my car is making. Thanks! |
04-06-2013, 11:44 PM | #2 |
Scooby Newbie
Member#: 294644
Join Date: Sep 2011
Chapter/Region:
MAIC
Location: Washington DC
Vehicle:2011 WRX Agile Auto DGM 440whp 420wtq |
Can you list what you have done to the car and what the rest of your drag info was, like 60ft etc. If you pulled off around a 1.7 60ft. My guess is you would trap around 120mph @ 11.8-11.9 1/4 mile. Power can vary since I have no idea what you drive. If its a 2011 Wrx like my car I would guess like 350-360whp.
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04-07-2013, 09:15 AM | #3 | |
Scooby Specialist
Member#: 236017
Join Date: Jan 2010
Chapter/Region:
South East
Location: Thomasville, NC
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Quote:
I was very happy with the passes I made, just curious as to what my traps tell people on here than know more about them and the correlation they have with HP. Like I said above, hopefully I'll get a tune on some better gas and get to make some 1/4 mile passes! Thanks guys! |
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04-07-2013, 10:21 AM | #4 |
Scooby Guru
Member#: 133146
Join Date: Nov 2006
Location: SC
Vehicle:07 FPgreen 7.37@95 WRX VF39+E85 12.0, 121mph |
The ralationship is power to weight ratio to trap speed... not just power
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04-07-2013, 12:23 PM | #5 |
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Member#: 323379
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Vehicle:1992 Trans Am |
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04-08-2013, 08:41 AM | #6 | ||
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Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:2002 WRX - 750WHP 9.5s @ 150mph |
Quote:
Quote:
http://vexer.com/automotive-tools/1-...MPH-calculator It even shows the distribution curves that it uses to calculate the results. The results on this plot generally seem to line up well with cars that have sticky tires (probably drag radials for the higher powered setups) and good drivers. Probably in the 1.5s 60' range or better. You can definitely have a high powered car that goes a lot slower than this calculator if you're driving or tires aren't up to snuff. |
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04-07-2013, 01:24 PM | #7 | |
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Join Date: Dec 2004
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MWSOC
Location: grove city ohio
Vehicle:04 sti 10.41@141 on e85@ 30psi--spinning |
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04-07-2013, 11:48 PM | #8 |
Scooby Newbie
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Join Date: Aug 2010
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i went 126mph this weekend with 490whp and 440wtq dynojet numbers. 1.67 60ft.
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04-07-2013, 12:09 AM | #9 | |
Scooby Specialist
Member#: 323379
Join Date: Jun 2012
Vehicle:1992 Trans Am |
Quote:
Traps are much better but are not something to gauge off except personal gains... Just like a dyno. Just like the dyno can read low or high, traps speeds are highly dependant on driver and weather. The same car with no alterations can vary 1-5mph easily. The driver can vary it 1-10mph. I've seen both extremes of both variables. With that soapbox spiel over with, yes you are somewhere in the 350-400 range of that is an average wrx on an average day. 91mph 1/8th mile is no slouch. That's at least a 120+ 1/4. |
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04-08-2013, 07:43 PM | #10 | |
Scooby Specialist
Member#: 323379
Join Date: Jun 2012
Vehicle:1992 Trans Am |
Quote:
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04-11-2013, 07:16 PM | #11 |
Scooby Newbie
Member#: 158766
Join Date: Sep 2007
Chapter/Region:
South East
Location: Otown Florida
Vehicle:2002 WRX 2001 GSXR 750 |
Google "Moroso Power-Speed Calculator".
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04-11-2013, 11:00 PM | #12 |
Scooby Specialist
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Join Date: Dec 2007
Chapter/Region:
TXIC
Location: Texas
Vehicle:11 Wrx hatch Dgm |
got a 00rs coupe with 04sti longblock, 06 6mt with a GT3076 .63 rotated, made 380whp/360tq @ 20psi on Precision Tuning Dyno "DynoJet" Reads legal from what i see.
best pass so far 11.9 at 117mph, need to get better at launching, tried 5k-6krpm dumping the clutch and feels like wheel hop in the back, tried slipping the clutch and got slightly better launches, still not a single 1.6x 60f. last year i got a 1.6x with my old engine that ran not this great, same suspension and worst tires, idk... |
04-11-2013, 11:46 PM | #13 | |
Scooby Newbie
Member#: 290896
Join Date: Aug 2011
Location: Phoenix, Az
Vehicle:2004 STi, FOR SALE PSM |
Quote:
The best I got on my '04 was a 1.71 short time, and that was launching on the 2 step. I did a total of 3-4 passes, best was a 13.2 at 103ish. I was all pissed off at the time because it seemed like everyone on here does about the same in a stock STi. Then again, the DA that night was 6500 feet, not to mention it was in the 90's and for 5 minutes, I was sitting in the staging lanes heatsoaking the hell out of the TMIC. I agree with the wheelhop thing, mine only stopped when I lowered the 2-step to 5000 RPM and put slightly more air in the tires so give that a try. This was stage 2/E85 with a broken ringland on cyl #3 I later came to find out. Never went back after that, a timeslip to me isn't worth possibly trashing my drivetrain. |
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04-12-2013, 12:19 AM | #14 |
Former Vendor
Member#: 286950
Join Date: Jun 2011
Chapter/Region:
BAIC
Location: Chico, CA (boostedtuning.com)
Vehicle:335i / WRX EVO 8 RS |
Here is a great spread sheet of horsepower on different dynos, the weight of the car and the ET and trap speed it ran.
Last edited by Boosted Tuning; 04-17-2013 at 12:30 AM. |
04-12-2013, 07:41 PM | #15 |
Scooby Specialist
Member#: 147972
Join Date: May 2007
Chapter/Region:
MAIC
Location: severna park md
Vehicle:2004 wrx hybrid 18g 11.9@117 dd |
I went 7.6@92 in the eighth and Im making 324/372 on a dynojet but my cars light, so you're probably making similar numbers.
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04-18-2013, 09:31 AM | #16 |
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Location: Micro aggression turnt
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If you make sure you aren't having timing pulled with logs, from knock/heat/shift knock/etc. then the hp/trap data should be pretty succinct.
Also, if you aren't keeping yourself in your powerband (this is why road logs and vd are cool) then your hp/traps won't match, either. I remember driving my sti like a noob at the strip, just not critically thinking, wasn't that long ago (gut check, 2006) I was going to redline on the vf in 3rd and 4th when I should've shifted, that hurt the trap, surely, hindsight is 20/20. |
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