So me and Xmax pretty much have the same mods to our cars. I/Y/E and weight reduction. Spare, jack, passenger and rear seats removed. He also now has a UDP. I have a cold air intake with k & n filter, he has a hybrid with stock resonator and a Tenzo Air filter. He now uses millenia wheels with drag radials, but still pulled a 14.9 on all season tires with 15s and no UDP. He has a 97 GXE vs my 97 SE. Both automatic. He doesnt have leather, sunroof, or spoiler, I have all of the above.

Heres my timeslip

R/T .085
60' 2.286
330 6.429
1/8 9.815
MPH 72.94
1000' 12.755
1/4 15.259 <------PB (was 15.4)
MPH 88.98 PB------>(91.74)

And here is his timeslip

R/T - .143
60' - 2.207
330 - 6.246
1/8 - 9.553
MPH - 74.24
1000 - 12.428
1/4 - 14.861
MPH - 93.58

Both were on the same day, same track. We actually did a head up run together, and he was ahead by a car length plus. I dont get it. Only major differences are he has stock b pipe, i have a custom 2.5" resonated b pipe, i have SE options, he doesnt, and his intake set up is different. What do you guys think?

 

I think Xander is the asian Superman and he makes the car fast by flying inside it and pushing it with his superpowers.

Dude, look at his 60fts.

 

yes, i understand his 60 fts. But lets say i pulled his 60', id still be 15.1-15.0. and look at his 14.9 from last year

R/T - .219
60' - 2.233
330 - N/A
1/8 - 9.568
MPH - 73.95
1000 - 12.460
1/4 - 14.909
MPH - 92.55

.05 difference in 60' time

 

what wheels are you using ? im thinking his car is lighter and so are his wheels and tires. advantage xmax

 

GXE's are usally faster than SE's less weight and same amount of power its quite obvious. Also helps he is a better driver than you apparently.

 

Every car is different. Dmbmaxima2k2 used to have a 96 SE auto with all kinds of mods on it. My car was faster than his when it was stock. We used to race from meet to meet to meet and I used to pull on him slowly. Driving ability plays a big role too.

 

Were these runs made on the same day? There are a million factors that can influence these things even if they were on the same day. lighter wheels/tires, maybe a 10th, better launch, .15-.2, lighter car, maybe another 10th, slightly more powerful engine, maybe .05, etc etc etc. You can't really quantify all these things.

 

I am pretty sure it is the lighter wheels that made the difference. Lighter wheels make a HUGE difference.

 

im using the stock sawblades on all season tires, he used millenia wheels with drag radials, but on his ultra 15 inch wheels with all season tires, he was still getting 14.9 We're going to weigh our rim/tire combo next week i suppose and compare then. Next track meet, we will have to drive each others cars and see if it is driver skills, or just his car being faster. We decided my sunroof and spoiler could be causing some of the difference. Does the spoiler actually increase drag?

 

On 3.0 autos, wheels will allow you to be or vice versa.

 

The DRs are probably making up some of the difference here because not only are they about 7lbs lighter than the sawblade combo, the DRs are also about 2" shorter than the 215/60 which means his gearing has improved by about 8%. The 4 speed autos need all the gearing they can get and those shorter tires seem to make a difference. I tried my DRs on my G35 with the 5AT and my car was actually fractionally slower because it was forcing a shift into 4th about 150' short of the finish line. With the 10lb heavier stock 17s I went 14.49@97.5mph. With the DRs I went 14.51@96.4mph. Gearing plays a huge roll in both trap speed and ET. It can impact it postively or negatively. When it comes to the Nissan 4 speed auto and short tires, it makes a positive difference.

I don't think all his advantage is coming from the DR combo though because they're not going to gain him nearly .4 and 4mph. The weight advantage of the GXE is so minimal compared to you're SE too. You're talking about 50lbs at most and that's mostly your moonroof. Is he a lot smaller person than you? Was you're car really hot and his wasn't? It's also possible that his car is slightly stronger than yours. Look at all your trap speeds and compare yours to his WITHOUT the DRs on various days. That will tell you if his car is really that much stronger. Trap speed indicates available power.

 

Xanders pulled a 14.9 withOUT DR's. How much does a sunroof weigh?

 

The majority is 60', tire/rim weight, tire diameter, and car weight


With the same 60' times you guys are withing .2 of each other. Your not gonna get much closer than that. We don't live in a vacuum, there are just too many other small variances that come into play.

 

we are both about the same size, both weigh about 180. We were talking and we will drive each others cars. If he can hook a low 60' with my car like he can, we'll see what my car can put out. And he did pull consistent 14.9s without the DRs and without the UDP. I now pull consistent 15.2-15.3. Im still working on my launching technique. Also, we've discussed a dyno comparision of our cars on the same day to see where his car is stronger. thanks for the help guys

 

I don't know why your getting so wraped up in his car being a tad faster than his.

 

because, 14.8 with i/y/e is great for an auto, correct me if im wrong. And im auto, im not boosted or anything, so i have to have goals to shoot for. and plus its just fun when we're at the track, i have someone to gun for. Cant gun for the 5 spd guys, wont keep up. I'm not losing sleep over it, just looking for ways to make my car faster, thats all

 

Try it and see what happens.


Mike, I think you meant why is he getting wrapped up with the other guys car being faster than his. If you look at the org, he's not the only one.

 

..............

 

Let's play connect the dots. ________.______.________.

 

I dont get what the ...................... means. And hopefully ill have this problem resolved since the VI should be on Saturday

 

He was probably questioning the validity of the statement that GXEs are faster than SEs.

 

Oh I got it now. If im not equal speed as him with the VI on, I've decided his car is a freak. At Byron, we had identical trap speeds, yet he was still .3 faster than me.

 

What are you both dynoing at?? Your ks could be going out, need tune up, etc.................

 

everything has been tuned up EXCEPT the KS. i just rolled past 125k, but I've checked for the code and havent gotten one. I figured I should replace it while we're doing the VI swap since it's bound to go bad anyways. o2 sensors are fine, and plugs only have 10k on them. With similar 60' times, he just starts pulling on me immediately. Look at the slips, and we'd be like .2 mph apart.

 

How about hooking up an obdII datalogger and see what your ign is doing vs his.

 

I dont have an OBII Datalogger, and dont know where I'd get one from. I plan on dyno'ing once the VI is on. We talked about doing a dyno comparision before, but neither of us had the funds.

 

KS is a wild guess. It could be 5-6 different things I guess. But a bad ks will pull timing and probably kill 10-15 hp.

 

Did you switch cars? It's very possible he is a slightly better driver. It does make a difference....... you may not be able to match his time in his car and he may get a better time in yours....

 

we were going to try that but wanted to leave the racetrack because of how damn hot it was. even with similar 60' times, it didnt matter. at a different track, he was pulling 2.20 60' with drag radials on millenia rims. but even without the radials and on all season tires, he was pulling 14.9 while i was pulling 15.2. And thats with similar 60'. My best 60' was a 2.28 and i got my 15.2

 

Ecko, you should come down and go for an Auterra session with me. Or just try the butt dyno to see if there is a difference with the KS unplugged.