Header Theory: Confirmed.

I guess well have to see what happens at the strip :wink:

My dad went 12.27 on the stock pulley, just Revo stage 1, awe Catback and roc intake everything else 100% stock.

Yup, and I went 12.206 with the exact same mods, in the “slower” B8.5 at that.

Maybe my car was an outlier outside the mean.

Probably because people don’t care about that “record” they just want to go after the fastest time, not the stock pulley 34psi in the tires, 5% window tint records.

Most of the guys interested in the strip were probably stage 2 as soon as it was available and therefore moved on from chasing any certain record “classification”

Not taking anything away from your time though…I have the fastest NA B7 S4 record…lol

I agree, that’s impressive def not taking away from your run. Impressive because you did it on less boost also. Who knows maybe ill break 11’s on the strip…

http://www.audizine.com/forum/showthread.php/566953-The-Header-Theory-Now-confirmed-again

S5 guy here, but been following this site for a bit. Obviously I’m mostly on AZ, but love honest and clear threads like these. Sorry I’m not adding anything helpful, but just giving a thumbs up and glad For not spending money after really wanting these headers when they first came out. Only mod I have is an X-Pipe, so I’m really a bang for the buck kind of guy, which I think this site is what I should be trusting.

Welcome to the forum!

welcome to AR

make an intro thread in General Discussion with some pics. We always like seeing the S5. Is it Imola?

stock pulley B8 S4 fastest list:

El Romano Manual 100 REVO stock/Stasis TVSr1320 12.06 117.07 1.82
1fasts4@GIAC Auto 116 GIAC AWE/AWE TVSr1320 12.08 114.98 1.79
not_armed/well_armed Auto 105 GIAC Eurocode headers/Milltek TVSr1320 12.15 114.18 1.78

You’re actually third fastest ET and third fastest MPH. Second fastest GIAC stage 1. Second fastest DSG too.

Comprae you to 1fast. Both ran at great DA. Both ran GIAC on race gas. Both ran DSG. Both had stock pulley. He had test pipes, you had headers. He was faster and quicker.

Not sure it matters, as I’m with Euro on this but I went 12.06 on stock pulley…

DA 450 Dragtimes - 3000 miles - intake, tune, exhaust, 100 octane - ESP/ASR off
1.7470 60ft
5.0713 330ft
7.7848 1/8 mile
91.36 1/8 mph
??.??? 1000 foot et
12.0694 1/4 time
116.82 mph

One thing I noticed in the AZ thread.

You also changed the catback from AWE to Milltek. Someone is going to metion that soon as a variable. Since the fastest cars run milltek, that’s tough to argue, but someone will try.

Also, people are noticing that the pbox 1/4 mile trap speeds were better on the headers. You may want to find other 1/4 mile b8.5 times you ran with the pbox at that location in similar DA to the DA you ran in last night, if you have them. Or just point to your ACTUAL 1/4 mile time from 2 weeks ago that trapped 115+ and that was using proper trap speed. The PBOX uses the final speed at the finish line, while the strip uses the 66 foot average before the finish. PBOX reads a bit higher.

Any idea why they use the average over such a random distance at the track?

No idea. Same goes for 1/8 mile trap speed (594 to 660)

Prob the same guy who decided a random measurement like 1320 feet will be the benchmark measurement of racing lol

Sorry, I was talking pump gas.

And my race gas runs on stage 1 were in +1000 DA. So almost a 2500 swing from pump to race on the same car…

the 1320 isn’t so bad. It’s 1/4 of a standard unit of measure. I’m sure space constraints and the older cars is why it’s 1/4 rather than half or a full mile. It’s just weird that they are so specific about everything into the 1000ths of a sec but then take an average for speed.

Using a predetermined distance and calculation will be more reliable than tracks using a radar gun or something, which would be the only other way to determine actual speed at a specific moment. I guess they could set sensors at like 5ft and get a closer to exact MPH at the finish, but what is the real point if everyone is being timed the same way? That is the beauty of certified tracks that should be somewhat standardized.

http://wediditforlove.com/trapspeeds.html

[quote]Just to clarify the trap setups…the old system utilized a speed trap of 132 ft., positioned 66 ft. before and 66 ft. after the quarter mile finish line. This in theory would give you an accurate speed at the finish line. The new system utilized only the 66 ft. distance before the finish line, so that both the e.t. and speed clocks would be stopped when the car crossed the finish line. In theory this setup would give you the vehicle’s speed at 33 ft. before the finish line. We obviously realized that there would be some mph loss. From a purist’s standpoint, this was a bad deal…but the benefits were undeniable.
[/quote]

The reason it’s only a quarter mile is mostly because of space…but don’t forget relevance and safety. At 1 mile cars are really moving. They’re also tripling the speed limit, so who cares what they’re doing up there.

The reason it’s a trap speed is because it’s easy to calculate trap speed using timing equipment. Time at point A vs time at point B = an easily discernable average speed. Much easier and more reliable than a radar gun of sorts.

It used to be 132 feet…66 feet before and 66 feet after the 1320 foot mark

That was 10% of the 1320 foot quarter mile, with the 1320 mark dead smack in the middle. That is how they used to calculate trap speed.

They changed it to eliminate the 66 feet after the line for safety, so now it’s just the 66 feet feet before up to the finish line.

Makes sense, I knew there was a reason.

This is my hypothesis on the effectiveness of the headers as you move up the ladder:

http://farm3.staticflickr.com/2823/10713913284_c3eceb97a9_o.png

Time will tell.