ZDCATC

You might as well do spark plugs and diff oil. I would check the maintenance records in case they were already done recently. That won't make your car 1 second faster but it's good peace of mind. Maybe clean your MAF sensor? (plenty about that on clublexus). Make sure the air filter is new? Were you using at least 91 octane fuel? I also like the theory that the ecu needs to figure out that it's now living at a different elevation. Well those are my wild *** guesses.

Damart14

Anything helps. I will definitely look into MAF sensor. I was maybe think the air filter while I was at the track. So I actually took the filter out. It looked new. Even though I took it out the track time did not change.

Gymkata

I would have you car looked over just to be sure, but you were running with a really bad DA that evening. Poor DA, poor launch surface, and inexperience maximizing the ISF on the drag strip could possibly account for a time that slow...but I personally would still check out everything to make sure your ISF is running properly.

I looked the track up on dragtimes.com and calculated your DA for your fastest run at almost +4000 ft! The corrected time for that run is 13.6-13.7 @ approx 109mph. That ET isn't good, but the MPH isn't too bad. I put in an actual mph of 104 in the calculator as a guesstimate, since there was a glitch on that run and your's wasn't printed correctly. I don't know if the DA was the reason for every car launching so poorly or if the track surface sucked. That comes into play as well. A 60 ft time of 2.4 seconds isn't good..so there's a few tenths there as well (if it was track surface related).

Damart14

Gymkata, sorry to ask, but what do you mean by DA? Did you see on the first page what I ran against? 2015 Mustang 5.0 IHE and tune and 2009 Challenger R/T? Keep in mind I am very new to all this.

Gymkata

DA is density altitude...basically the conditions (altitude, temp, humidity, barometric pressure) you were running in were the equivalent of running at almost 4000 ft above sea level and with this your car was making less power and was slower that it would have been at sea level or whatever conditions are that equal a DA of 0 ft. The fastest times that you see posted here are typically in conditions that have a negative DA value (greater air density) when the car is making the most power.

Yes, I saw which cars you were running against. Provided the Mustang had a clean run, a 2015 Mustang GT with full bolt ons and tune running in the low 13s is a good indicator of how bad the conditions were that day.

Damart14

Gymkata, so you're assumption is the altitude? It's mind boggling that it ran that time. The was a 2016 Dodge Ram hemi with intake header and exhaust that was running in the high 14s. I guess I don't really have control of the altitude.

Gymkata

The DA had a big effect on your time, but there were other factors.

JDMV8

iTrader: (6)

That Mustang trapped 750 mph yeesh. He prob had $100 million under the hood, Jesse

tas02

iTrader: (2)

2.299 best 60 foot time on the 3 slips. It appears traction was difficult to find. Are you running all-season tires? Leaving from an idle?

Damart14

There were a couple times I could feel the slippage so I warmed the tires up before which seemed to take care of that. I power brake it and the rpm up to 1,500. And I'm not to sure on the tires. I will have to look. I do know they are Michelin.

mikersoft

iTrader: (1)

jat0223

iTrader: (1)

Usually you'd get better times by not power launching. Just launch from iddle. Also, are you using traction control or turning it off?

Damart14

I'll have to try that next time. And I had traction control turned off.

Damart14

Vervish, during the ecu reset procedure do I need to disconnect the battery? The previous owner just had the battery replaced at Lexus and they told him they had to reprogram the computer once they disconnected the battery? Sound accurate?

lobuxracer

iTrader: (2)

Nope. Sounds like BS. Sounds like your "old man doctor" wasn't exactly what you expected. Or the engine has been run so gingerly that it is glazed and not making power for anything. Have you taken it out and really put a load on it, like fully checked top end speed? Mash the gas to the floor and let it get over 150 mph? If you haven't, it might not be fully broken in, but by the mileage it has now, that's not going to solve it either. You really need to get that done in the first 20 miles after starting the engine for the first time.