What the smallest amount of whp that will affect the 1/4 speed of the 350z (3500 lbs)? Will increasing the whp create an linear relationship to increased 1/4 mile run times. i.e. 25 whp = 2/10 sec off of your 1/4 run.

 

Stock Z can run Low 13s 500whp Z can run high 14s.

 

I don't believe there is a linear relationship. If you notice 11 sec cars need to gain a substantial amount of more horsepower to hit 10's. The faster you go the more aerodynamics plays in to the equation. So, no whp isn't linear to 1/4 mile time, my assumption.

 

How you drive determines the time more often than whp. My first 1/4 mile was in a '10sec car', and it took me 13 to get down the strip.

 

Correct. It takes more additional horsepower to go from 13.5 to 13.0 seconds than is does to go from 14.0 to 13.5. And double or triple that to get from 13.0 to 12.5 seconds.

The relationship is exponential. You are working with the law of diminishing marginal returns.

You can add incremental horsepower here and see what happens to ET: http://www.wallaceracing.com/Calculators.htm

 

ha ha good one. I am a 14 second driver in a 13 second car.

 

BTW where is your ET?

https://my350z.com/forum/drag/233840...ons-stock.html

 

maybe it would be better to focus on what whp does in relation to your trap speed. I know alot of 800whp 12 second supras lol. The mph will tell what kind of power a car is making even if there is a poor driver or poor traction.

 

Even then, a $hit driver will trap lower than a good one at ANY power level

So the Supra that runs 12.3 @ 121mph would run 11.4 @123 with me in it...

 

I definitely agree with that lol

 

in theory your hypothesis makes sense. all things equal, the more horse power you can make, the faster your car would go. however in practical application there are way too many variables to calculate this to any degree of precision, let alone accuracy.

variables include
traction (tires, track surface)
driver
weight ( different models weigh different amounts, driver weight)
power delivery
atmospheric conditions (temp, barometric pres, wind, humidity etc.

then you must conscider that the faster you go the greater the ammount of power required to accelerate. a graph of the amount of power that is nessecary to continue to accelerate looks something like a upward opening parabola with the range restricted to only possitive values. it begins at zero and the faster you go, the closer you get to a vertical assymptote. eventually the amount of power that is required to accelerate on mile per hour faster become rediculous

plus like I said more power= more speed if and only if you can put the power to the ground (without wrecking, or creating a huge smokey cloud down the dragstrip).


in other words the answer to you question is: no there is no linear equation where X-hp=Y reduction in 1/4 mile time

if you could marginalize all of the variables then you could perhalps derive a quadratic equation. but not a linear one.

 

So explain this. Why is it that the fastest stock 07 Z we have seen on this site trap a 109, and the fastest bolt on trap the same and run nearly identical times or quicker times with lower mph? Even with a 20-30 whp difference.

 

The launch was better in the lower whp car

I'll post my Dynojet WHP numbers thruout my cars runs, mod levels, you can see its not consistent.

238whp stock = 13.7 @ 101.4

262whp bolt-ons = 13.1 @ 107

380-390whp Turbonetics = 11.9 @ 116mph

525whp Greddy, old setup, JWT S1 cams, 13psi, LETTING OFF BRIEFLY = 11.1 @ 126

600whp WELL DRIVEN is EASY 132mph trap. Many on here require much more power to trap 132mph or higher and well, that just plain sucks

650ish whp is 134mph easy, with a good driver. Unfortunately the norm for most here in the FI section (as most upgrade power before even honing skills at NA levels) is pretty trash.

 

Density altitude. Look at the racers who have been bumped in November and December. These hardcore fools are out there when it is 40 degrees.

Tailwind. Never seen racing cancelled with a tailwind. Crosswind yes. Tailwind no.

 

Exponential relationship. You need a lot more power to keep going faster.

 

and the proper suspension/tires/gearing to put it down efficiently. get a balance and youll see results

 

300hp=14's
400hp=13's
500hp=12's
600hp=11's
700hp=10's

 

If you have palsy, then yes follow the above. 400whp is 11's in a Z. If its not, look at the idiot behind the wheel.

 

Got a buddy who ran 12.1 @ 126 in a nismo hr with gtm stg1 and 10 psi.

I made 408 on a mustang dyno at 8psi and I beat a 123 camaro and a 122 cobra from 60 mph. Down at sea level we go alot faster... I'm currently tuned to 450whp on 10 psi I'm gonna take a stab at a z06 soon. They trap around 126 down here stock.

 

This is exactly why I am concentrating on lightening and stiffening my car this winter rather than more power. Come spring I can take it out with the new wheels and slicks and concentrate on launches and adjusting my setup at under 350whp. Once I get better then I am going to bump it up with some nitrous