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Old 07-16-2002, 01:36 PM   #1
odyss3y
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Default dyno to 1/4 guesstimates

I recently was dynoed at 200tq and 195hp. What would be a fair time/speed for a 1/4 mile time (factoring out that I'm a 1/4 mile virgin)?
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Old 07-16-2002, 02:56 PM   #2
SGOSWRX
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Default Re: dyno to 1/4 guesstimates

Quote:
Originally posted by odyss3y
I recently was dynoed at 200tq and 195hp. What would be a fair time/speed for a 1/4 mile time (factoring out that I'm a 1/4 mile virgin)?
Its going to depend on your driving skill. I see guys with stage 1 setups that can barely run 14s in the 1/4 mile. They are afraid to drop the hammer and let her rip. On the other hand there are guys that can pull low 14s in a stock WRX.

If you know how to get a clean 5K launch 1.80 60' time - which is the most important thing to running a good time in a WRX (Besides HP/Torque) you should run high 13s - low 14s @ 96 mph or so with 195 wheep hp.

Like I said before it totally depends on your skill as a driver. You could run 13.8 or 14.8 - It all up to you. Just practice your launch before going to the track. The track is stickier than the street and its easier to bogg. So get the revs up and drop the clutch and floor it. Make all your shifts are clean around 7k and you should be in the high 13s or low 14s.

I know G-Tech aren't the most accurate things in the world but they are great for practice. I used one when I had my stage 2 setup before I started going to the track. My G-Tech times where in the mid 13s and when I finally went to the track I ran mid 13s. It was right on the money. They work suprizingly well for a $159 tool.
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Old 07-16-2002, 03:04 PM   #3
odyss3y
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Default

cool thanks for the info ive looked at a g-tech before and liked the idea but i need engine management first. would a link ecu be able to help me with my 1/4 estimates? again thanks for the info.
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Old 07-16-2002, 06:08 PM   #4
V6TurboTA
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Bench racing is an important part of tuning

Sorry, I forgot.

~v6

Last edited by V6TurboTA; 07-16-2002 at 09:39 PM.
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Old 07-16-2002, 06:22 PM   #5
odyss3y
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Default

thanks for your constructive input. surely helped me a lot. next time you might think before posting and realize im trying to see what to expect when i do go to a track and get a 1/4 mile time.

"am i slow? am i fast? who knows? im an ass w/o a baseline for comparison"

i dont live my life 1/4 at a time, but i'd consider using a 1/4 time as a form of tuning instead of **** waving. surely if you are as cool as you think you are, you could see my point, right?
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Old 07-17-2002, 12:58 AM   #6
hotrod
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Default looks like high 13's

If you make a perfect run with a weight of 3250 lbs and 229 flywheel HP ( taking your 195, and figuring it is 85% of the flywheel value.) You get a computed run of about 13.94 @ 97.2.

Here's a link to the calculator I used.

http://www.slowgt.com/Calc1.htm#PerfHPWt

Larry
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Old 07-17-2002, 01:10 AM   #7
Sordid Philosopher
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Default Re: looks like high 13's

Quote:
Originally posted by hotrod
If you make a perfect run with a weight of 3250 lbs and 229 flywheel HP ( taking your 195, and figuring it is 85% of the flywheel value.) You get a computed run of about 13.94 @ 97.2.

Here's a link to the calculator I used.

http://www.slowgt.com/Calc1.htm#PerfHPWt

Larry
I guess that works - standard loss in a 2 wheel drive car is 18%. Loss in our AWD is about 26% (I use 25% because I can do it in my head), but the calculator is for two wheel drive cars. The problem is that we can do a better 60' than a 2 wheel drive car with the same HP...I would take 13.94 as the worst case mechanical number.

Just my rumblings.
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Old 07-17-2002, 04:53 AM   #8
hotrod
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Default choices choices

Yeah I wish there was a good reliable power loss number for our drive train derived from people who have actually run an engine on a true engine dyno, followed by an as installed in the car on a chassis dyno.

I have finally decided that given the variablity of chassis dyno numbers to just take 85% as a ball park number and stick with that.

On the issue of the two wheel vs four wheel launch advantage, folks need to remember that that is only valid if the 2WD car has inadequate tires.

There are a lot of high power well setup 2WD cars that can pull 60' times down in the sub 1.6 second range.

I ran a couple of cars a few weeks ago at test and tune nights here and one a 1966 chevell with a 383 block and pulling 10 inch slicks had a 1.978 60' on a 13.074 ET,time and the other a hi po VW pulled a 1.706 60' time on a 11.285 ET.

With big slicks and lots of rear end gear, a 2WD can get down to the physically achievable limit of 60' acceleration for their power level.

Larry

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Old 07-17-2002, 11:36 AM   #9
odyss3y
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Default

Quote:
Originally posted by V6TurboTA
Bench racing is an important part of tuning

Sorry, I forgot.

~v6
You've completely missed the point... but I don't think I'll bother explaining it anymore.
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