What a bad couple of days for performance from my car

[crayzitalian3]

once in a while maybe like once or twice a month i would go to this vacant lot by my house and do some 0-60 runs with my dynolicious app for my itouch. i usually get like mid to high 7's sometimes low low 8's.

recently though, i have been getting high 8's, 9's, and 10's............WTF is that SiHt

do you think something is "going" in my car aka dying.

it's really bothering me because my car used to launch pretty hard and sometimes spin the wheels where it actually would spin for a good strong second or two. now it feels like im in a smart car and it just sucks.

anybody have any idea what is going on with my car?if someone wants, they can come by my house this week and give it a drive with me in it and then let me know, like Fo Sho!

[Mr.Coupe]

Did you change Gas Grade in the last couple tests? That could be one of the reasons. Tires could be going low on thread. Those are the only things I can think of. Well good luck finding the solution dude.

Ricky C.

[1125Altima3.5]

Did you change Gas Grade in the last couple tests? That could be one of the reasons. Tires could be going low on thread. Those are the only things I can think of. Well good luck finding the solution dude.

Ricky C.

I dunno - the Altimas are tuned to run on 87 octane, so gas grade really shouldn't be a factor (unless the OP got a bad tank or something). Worn down tires can actually provide better dry traction (but worse wet traction) because the water channels are gone and you have more rubber on the road. That would depend on how the tire is constructed of course.

It could just be that the ipod accelerometer needs to be calibrated too. I would just give it a couple more tanks of gas and see if anything changes. If not then I would ask a dealer to check the transmission fluid with CONSULT at the next major service.

[marlin29311]

You're basing your performance times on a iTouch....with a free app....that isn't accurate....

Methinks you should stop worrying.

[crayzitalian3]

lol it was 13 dollars thank you and it's pretty dead on, i calibrated it and everything. did you ever see the comparison video with the g-tech and the dynolicious and the dynolicious was much more accurate when it came to quarter mile times!!!! watch the Vid Kid! lol

i actually have just switched from premium to regular two days ago because on my bullydog i had the gas settings set at premium because of the premium gas i have had in it, but now i set it to regular because i just put regular in, so you think i should just stick with regular from now on and how long would it take for my car to get fully adjusted to regular, it has been two days already.

[marlin29311]

There is no substitute for a measured track with real radar guns. You're basing your entire performance on an innacurate instrument (yes, the accelerometer in the iTouch is an innacurate instrument). It may be pretty good...but it's not real and is certianly prone to environmental changes. Humidity, etc...can all affect both your car and the accelerometer in the iTouch.

[dldjros69]

Why did you go back to regular gas?

All the suggestions here seem plausible. How many miles are on your car?

Bald tires do not = slicks. The tire is not constructed to be a slick. If its worn out its not gonna get the traction you desire.

Where the he77 is dear park? ill be over today. lol

[crayzitalian3]

lol its new york

recently i have decided to stick with regular gas since our car is built around it, unlike the 3.5 that requires premium. so i figured if our ecu is programmed for regular and i use the regular tune with the bullydog, maybe i would get more performance out of it.

so i guess ill give it a week and see what happens.

marlin you are right about the dynolicious thing, im not saying your wrong, but if you know G-tech is and when they compared them both (G-tech Pro and the Dynolicious App) the Dynolicious app was more accurate to the time slip then the G-tech was, which was impressing.

im going to do some more runs probably in a couple days to a week to see if there were any changes

[marlin29311]

marlin you are right about the dynolicious thing, im not saying your wrong, but if you know G-tech is and when they compared them both (G-tech Pro and the Dynolicious App) the Dynolicious app was more accurate to the time slip then the G-tech was, which was impressing.

im going to do some more runs probably in a couple days to a week to see if there were any changes

Nah, I get what you're saying bud. I'm just trying to say don't get all bent out of shape because you're times might be a second or two off from using a device that wasn't designed with car performance in mind. There's a lot of factors that could be influencing how the iTouch reads...I mean, you could have it at a small angle off that could be throwing the readings...

I'd say wait until it gets a little cooler/less humid out at see what happens with the fuel tune. And the balding tires don't ever help either...

[crayzitalian3]

sounds good Marlin, thanks man !!!

[Shade Tree]

outside air temp.tire pressure.tire tread.gas grade.parking lot ground temp.full tanlk of gas or 1/4 of a tank - its all weight.not sure if you have the cvt or not, but they feel inconsistent as well.

all variables that effect 0-60

[maxentropy]

I guarentee its the outside temperature since it's getting hotter and hotter still.

[crayzitalian3]

it could be because i hit my fastest time during the beginning of spring so it was still kind of cold.

[JeremyMicheal]

Nah, I get what you're saying bud. I'm just trying to say don't get all bent out of shape because you're times might be a second or two off from using a device that wasn't designed with car performance in mind. There's a lot of factors that could be influencing how the iTouch reads...I mean, you could have it at a small angle off that could be throwing the readings...

I'd say wait until it gets a little cooler/less humid out at see what happens with the fuel tune. And the balding tires don't ever help either...

I agree with the humid part. I lived in Deer Park. Your in the middle of the island with no breeze. It gets really humid there. All i can say is thank god i had a basment apartment during the summer...

i'd say eventhough our egine is designed for 87 octane i dont think droping back to regular tune on the on BD is gonna give us more performance. this is just my observation as i dont own a BD yet but will shortly and plan on running the prem..tune. I've always ran 93 in all my cars.

[dldjros69]

i'd say eventhough our egine is designed for 87 octane i dont think droping back to regular tune on the on BD is gonna give us more performance. this is just my observation as i dont own a BD yet but will shortly and plan on running the prem..tune. I've always ran 93 in all my cars.

(for the most part)

Bully Dog makes 2 tunes - the regular and the premium. The reg tune is a little more aggressive than stock. The prem tune is a lot more aggressive than stock, hence the need for prem gas to avoid pining.

Im not with stupid though running 93 in cars that dont require it. But thats a different topic, and not my money.

[PHENOMenalVinyl]

I guarentee its the outside temperature since it's getting hotter and hotter still.

def this

li has been mad hot latly my mom keeps b****ing to me about it lol......but seriously also u changed to reg of course ull get diff numbers i think if u use the premium itll work better idk altimacoupedan could tell u this s*** he knows what it all means lol

[crayzitalian3]

what do you run with the BD, i wanted to see if there was a difference between the premium and the regular and honestly i really couldn't tell a difference. i just want to put my headers in mostly, but im still waiting for that flange to be shipped!

maybe ill just start sticking with premium again since gas will be going down soon most likely!

[maxentropy]

danny runs the premium tune on his BD if I remember correctly-- but he also has the headers and runs premium fuel.

[dldjros69]

danny runs the premium tune on his BD if I remember correctly-- but he also has the headers and runs premium fuel.

^yup

i didnt even try the stock tune and doubt im gonna. im far to lazy to switch it.

(flame on) The premium tune just sounds faster so that is how i roll.

Same with real life. I believe all rumors to be true until proven otherwise. (i work at a grocery store)

[JeremyMicheal]

sorry to hijack your thread crazy..

eventhough everyone says the car is designed for 87 i do get alittle better performance. i commute 90 miles a day and noticed i get 3 miles more per gallon. i know it's not alot more, but in my mind getting better gas mileage and using a cleaner fuel is worth it..plus there's always the butt dyno..

but my question is..did you notice any difference in your avg MPG while running the premimum tune? thats one of the questions i had before i go out and buy it. thanks!

[dldjros69]

Umm to be honest with you i havent really checked my mileage lately.

Since i got the header and the BD tune ive been driving like a real @$$hole.

And i work a mile away from my house so i dont even care.

A few pages back i posted a link to a show on spike "trucks" where they tested the bd tuner (throck linked the episode).

They only tested the regular tune vs. no tune for gas mileage. Im sure with the premium tune gas mileage goes down a little bit.

[fiveliterbeater]

once in a while maybe like once or twice a month i would go to this vacant lot by my house and do some 0-60 runs with my dynolicious app for my itouch. i usually get like mid to high 7's sometimes low low 8's.

like they said....you're going off an application that's supposed to be a ball park figure....not dead on accurate.and besides,,,,may i ask why you're beating up on your poor little nissan? maybe she's trying to tell you that she's tired of you flooring it and she wants you to be gentle now

[Sentientbydesign]

sorry to hijack your thread crazy..

eventhough everyone says the car is designed for 87 i do get alittle better performance. i commute 90 miles a day and noticed i get 3 miles more per gallon. i know it's not alot more, but in my mind getting better gas mileage and using a cleaner fuel is worth it..plus there's always the butt dyno..

Let's not confuse octane with fuel cleanliness. The two are WAY different.

Humidity and Temperature are usually the culprits for varying performance.

I get the same problem on my G. Some days, I make myself queasy from the torque. Other days, I wonder why I bought an expensive "sports car" when my I30 pulled the same (not really, just feels like it).