my friends 3300 lb fox body mustang that made 480 rwhp through a 5 speed was trapping 130-131 mph. this was also at a crappy track (island dragway in NJ) that is about 600 feet above sea level. I don't know what the DA was.

if you guys think 500 rwhp and 3350 lbs trapping 125 is normal you need to have your heads examined.


hence, advanced deception.

edit:
forgot about another friend of mine with a 2003 cobra. car weighs about 3850-3900 lbs with him in it. it makes 460 rwhp. he is one of the quickest stock blower/IRS cobras in the country. 10.99 @ 123.4. same track as above.

I know these are both ford examples but hp = hp and weight = weight.

 

Your reasoning is faulty and here's a perfect example:
What does putting a slick on have anything to do with your gearing? I assume from this the slick was the same size as your original tire? Are you talking about the slick growing as speed increases? As stated you are oversimplifying this.

 

Had a 265/50/15 street tire 25.8 inches tall

And a 26x9 slick, now just HOW much do you think a 26 inch slick grows at 107 mph?


Putting a slick on has minimal to do with my gearing at 107 mph a 26 inch slick doesnt gow much if any. As evidence of the same mph with both tires.But the old 5.0 would run 13.0 on old school radials and 12.70 on slicks.

The very same car with bolt ons ran 101 mph with a 2.73 gear and a 3.73 gear, but picked up 3.5 tenths with the gear change....14.0 vs 13.66. Same hp, same weight, better 60ft and 330. Same mph, 100-101.

I will not argue this point anymore. I wil continue to give examples to your liking though.

BIG DAVE

 

why do my friends run times that are consistent with their power and weight but this 500 rwhp mega-LT1 does not?

please, answer this question.

 

trust me they trap much higher than that mine is a pig at 3450LBS and I have 451 rwhp and 366 rwtq and I trapped 127mph in 1800 D/A and only 9psi in the slicks

I think with good D/A and a little weight taken out and if I ran on DR`s I could get 131 out of it

 

I know you aren't really looking for an answer and I know you wont except any answer given.

Running 10.8s in a street driven 6spd 355 car puts that car in a pretty elite field. Trapping 126+ mph NA is an elite group. Running 10.8s NA with factory ported parts is no easy task and has been done few times.

Not every run is a persons best. You can reread the original thread in LT1 Tech that describes the DA, bog, headwind, powerband (gearing) and other issues. If you choose not to except those as legitimate reasons for not runing what YOU expect it to run, that is a personal issue.

Should (when) that car run faster in the future, I hope you make the effort to admit you were wrong. See things as you want, but man up when the time comes.

 

I don't really have any argument with that. Looking at your sig might cast doubt on the 450rwhp dyno though. I'm not saying it didn't actually make those numbers, but many of the parts in your sig. indicate a car that has dyno number robbing parts.

A motor setup similar to yours would probably make 6-650hp on an engine dyno which could produce dyno numbers up to 560rwhp in a dyno happy setup. The car in my sig. dynod 341rwhp with a th400 yet has trapped higher in the 1/8th than the car in the original post.

Perhaps our cars are good examples of those other factors that can play into the "equation" of RWHP+Weight = Trap? I believe the things I listed earlier in the thread might be influencing the numbers higher or lower, that isn't accounted for in a basic formula.

Congrats on that fast car! You are hualing ***

 

10.8s and 125+ mph IS impressive on stock heads. I never said it was not. what I said is the car is not making 500 rwhp.

I posted two examples of cars that I know very well. I can show you 10 videos of each car running consistent 10.9-11.0s each. I can also show you the dyno charts from each car as well as dyno videos and have the weight with driver of each car. That is a lot of hard data that backs up my argument that a 500 rwhp 3400 lb car should be trapping 130 mph.
yes, he may be bogging. bogging doesn't take away 5 mph. DA is probably similar to what is at island dragway (which is between 600 and 650 feet above sea level and usually a little humid.) I never read anything about headwind but I didn't scan every single post. gearing also isn't going to take away 5 mph. the 480 rwhp fox went from 2.73s to 3.27s and the trap speed altered by about 1 mph. the 03 cobra runs stock gearing.

all the things you mentioned don't add up to 5+ mph through the quarter.

how about 95bird's car? this is his sig:
95 firebird M6, 355, stock crank, Steve Stumph/SAR2K ported lt4 heads, custom Futral Motorsports solid roller,Moser 9" with 4.71's and a spool. Madman suspension
10.39@131.6 1.42 60' NA 476 rwhp/408 rwtq(pump gas and old lt4 setup..new setup coming soon)
10.93 @ 125.8 1.47 60' Na on old lt1 heads/intake.(428rhwp/407 rwtq)

concentrate hard on the bolded part. that is a car with a little over 3300 lb race weight. 476 rwhp got him 131 mph traps. 428 rwhp got him 125 mph traps.

now, I will say it once more
that 500rwhp car better trap over 130 mph or
1) he sucks at driving
2) it doesn't make the power he claims
3) he is racing on mount everest

good day, sir.

 

Also my car with an auto thru a loose converter made 400rwhp and ran 123mph@ 3400lbs so 500rwhp should trap 130+mph, I agree.

 

did u get ur 4l60e pro race rebuild by cahall performance transmissions in delaware? he has my tranny right now doing it up nice!

 

Examples like that aren't convincing enough to back up just throwing out an arbitrary peak hp number and race weight and being able to determine an accurate trap speed w/in a couple of mph. As I've told you before there is a difference between the output from the several characteristics of different drivetrains and that includes comparing the 1:1 dyno output to going through the gears on the track.