alright so i put my 03 5AT to the test against an 03 z 5AT, 1st we were even, 2nd i pulled a fender on him, 3rd i pulled 3/4 of a car on him, have to consider that his z was stock, but mine being rated at 260 and his being rated at 287 i think its kinda funny, dont think its much of a drivers race since both were AT

 

how do you figure that...every pound off of the crank is 2hp gained on a NA engine....if you go force induction it has shown numbers up to 35hp gained......

sry i said lbs on the last post should of been HP.....

stock i ran 14.7 i have a exhaust 5/16 spacer and CAI and im at 14.1 now...so im sure if i knocked off more than a half second with those 3 mods then test pipes will knock off atleast .2

 

I went from a 18.3 to a 13.7 by adding a k&n and crawford cats.

Of course, the first run I stalled at the line, and it took a while for the car to crank again. And it was 100 degrees. And when I ran a 13.7, it was 25 degrees.

What were your traps stock versus now? ETs mean squat.

 

seriously what are you even talking about now? you went from asking....

"Does anyone really think a popcharger, pullies, and pipes are going to deduct more than 1 or 2 tenths from his et?"

to saying ETs mean squat.....where are you going with this? I simply said that by adding pulleys doing the math your going to gain X amount of HP and by adding pipes your going to gain X amount of HP...and yes its going to improve your ET. What does any of that have to do with stalling at the line when you installed k&n and cats?

The answer is yes, by him adding test pipes and pullies he is going to run fast times.....

 

beause it's not a Viper or Ford GT might be two reasons.......

 

Sorry, let me clarify. I didn't stall because I had cats and a k&n. First ever run, stock, I was so nervous that I just talled. That gave me a 18 second run. My best ever run was a 13.7. At the time of the 13.7, I had a k&n and cats. From first run to best run, I didn't gain over 4 seconds because of two cheap bolt-ons. That was to illustrate that ET's are a meaningless way to gauge the value of a mod(except for tires). To get a real indication of a mod, one looks at trap speeds as they typically don't vary too much. When you said you went from a 14.7 to a 14.1 because of breather mods. It just won't happen with this car. Conditions changed, and your skill also changed.

I'll ask again, what were your traps? That will tell us more.

 

Huh? I think it would best for you to take a gander at my350Z.com and take notice that there have been two stock 5AT 350Zs run 13.6s@101mph which matches the best stock time for the 6MTs. 13.6s in stock Z's is a rarity, but it happens. Most guys see 13.9-14.1 though. There is no difference in 1/4 mile time between a 6MT and 5AT, 350Z or G35.

My 250lb heavier G35 sedan 5AT with a Z-pipe has done many a 14.3-14.4@97-98mph at altitude. I'd certainly think that a lighter, shorter wheel-base (very important), and supposedly more powerful 5AT Z would be a bit quicker than my G35.


Concerning this "slow" G35, the answer is simple, the 5AT is far easier to launch and the Z is a quicker car. A low 15-second @95mph 350Z 5AT running in AZ suggests to me the following:

1) High altitude
2) Hot air

Both of these things will absolutely kill performance. It's as simple as that. Find me the city, date, and time of this Z's runs and I can calculate the density altitude.

 

We're not talking about your track. We're talking about the US as a whole. If I based everything on what I saw at my track, then yes, modded Zs would only be seeing low to mid 14s, stock LS1 F-Bodies do 13.5s, stock C5 Z06s and Vipers do low 13s.

 

A 6" diameter pulley mounted directly to the crank shaft is hardly going to free up and power. You must understand the physics at hand. Removing 10lbs of rotational weight from a 26" diameter wheel will have a far more significant effect.


People need to wake up and stop believing what the aftermarket companies tell you. Read and do the research yourself and then you'll see that these claims are unfounded.

 

sorry for the noob question i been around racing for along time so i should know this maybe i use a different word for it but what do you mean traps?

if your talking about the end of the track.....i usually go threw just at the end of 3rd geazr shifting into 4th...6600rpm about

 

US as a whole what are you talking about.....? you cant get a 1/4 mile time by averaging in tracks from the whole US if thats what your talking about (and that made no sence at all) if your talking about just other tracks in the US i was just curious of where was running at and how they are able to run such lower times....obviously because of humidity temperature elavation and what not but what it compares like to here in florida...

 

thats not just from reading on a after market company website....i didnt mean 2hp on every car i ment it as a average, some see more than 2hp some see less than 2hp....and it is true the lighter the pulleys the more HP gained because it is rotational weight that is saved..meaning the crank isnt going to have to work as hard....the less the crank works the faster it movessss....
its the same with rims the lighter/smaller the rim the easier it is to move which means the car will accelerate faster. take it back to the good old bicycle for example you get on a lil sports bicycle and you start pedaling its easier to get to a top speed because the wheels are smaller, you get on a mountain bike start pedaling its going to take you longer to get to that top speed due to the tires bigger in size....enertia basicly

 

When you see a 1/4 or 1/8 mile time posted it's usually in the form of xx.xx@xx.xxmph. The segment after the @ is the trap speed. The trap speed is the average speed your car is travelling over the last 66' of track.

So, a car that traps 100mph is going faster than a car that traps at 95mph. Trap speeds are much more consistent than ET's. Two cars may have wildly different ET's, but identical traps.

Example: a car that traps 100mph but runs a 14.5 ET is spinning early on in the run. A car that traps 100mph but runs a 14.0 hooks off the line(comparitively). Both cars are making similar power, just the one with the better ET has better traction.

 

Altitude is not a concern in Florida seeing that it is the flatest and lowest level state in the country. As for temp, in the winter months, Flordia is one of the best places to race because of the ideal 50-60 degree evening temps. Humidity has little effect on performance, especially is the drier winter air.

 

so say my time slips reads 14.13 at 99.6 MPH the 99.6 mph is going to be my trap speed?