Quicker Decelertaion

[BrazdonW]

I'm not sure if there is already a thread on this (i had no luck finding one) but when you will notice when the car is sitting still or in gear that when you rev the engine the deceleration is very slow compared to most cars. What are some step you can take to change that?

[YarisSedan]

I think its possible due to the drive by wire system electronic throttle. When you snap it on a conventional system the cable snaps open the butterfly and the spring quickly snaps it shut if you take your foot immediately off the gas.

On our system its controlled by a computer and electronic motor. Could be the motor can not react as quickly within a split second and gradually closes back down the butterfly.

[HTM Yaris]

A lightened flywheel will solve that problem , but will create others

[kngrsll]

A lightened flywheel will solve that problem , but will create others

like stalling when you flip it into neutral. my car does this all the time now!

[why?]

like stalling when you flip it into neutral. my car does this all the time now!

really? that stinks.

[kngrsll]

its not a big deal. if rolling, throw it back in gear and if stopped, just start it haha

[thebarber]

i had fidanza in my xrs and never had a stalling problem.....6.5lbs vs 13lb stock....so super light too

but lightweight pulleys and flywheel will help the engine rev up and down more quickly

[BrazdonW]

Are these the only possibilities?

[Doc Zaius]

Hack the signal to the throttle body? :tongue:

[Gideon]

Actually, it would be possible to use a 1ZZ throttle body. My idle went up 200 rpms when I installed mine (and hasn't gone away), which would help.

[BrazdonW]

i have a corolla tb is that what you mean?
the deceleration didnt change when i swapped it.

[BrazdonW]

i had fidanza in my xrs and never had a stalling problem.....6.5lbs vs 13lb stock....so super light too

but lightweight pulleys and flywheel will help the engine rev up and down more quickly

maybe i should do more pulleys?
i have the lightweight crank pulley
would changing the others really help?

[kngrsll]

why do you want to make the engine stop spinning faster??

the only reason i can think of would be because that means it spins more easily while accelerating? thats kind of a backwords way to look at an improvement in throttle response though.

to improve throttle response, in general there are two things you can do. lighten the parts that rotate (ie pulleys, flywheel, remove things like AC) or improve the flow (individual throttle bodies, header). i think timing has a small influence, but its probably minimal.

so if you improve throttle response, you will improve your engine slowing down thing, also increasing your ability to stall the car lol

[thepoche]

why do you want to make the engine stop spinning faster??

More engine brake would help with throttle steering but I don't know if thats what BrazdonW had in mind.

[BrazdonW]

It is more of preference thing than it is a performance thing
i like when it snaps back fast because it is what i'm used to
the other cars i have owned have all snapped back much quicker
and its not as if every car i have owned has been a performance car (geo metro, dodge neon, vw gti mkII)
as an econo car i know it will have some quirks but this is just one i don't like
id like to fix it somehow :)

[jonismyname]

hmm. friction brake on the serp belt? if anyone (other than ctscott, he's busy making yargauges!) has the ability to read the signal to the solenoid that controls the throttle body it coud at least be confirmed it's a bastard child of fancy programming and our econobox.

another option is following in garms footsteps---fancy gas pedals and cable system!

standalone ecu?

i'd say it's in the software...

[MUSKOKA800]

I noticed this back in the day when emission controlled vehicles became the normal and was told that a slower/controlled RPM drop reduced pollution. My guess is that todays cars rev down slowly for the same reason.

[cali yaris]

No problem at all with stalling and a lightweight flywheel here. (and that includes before I added FI). Don't let these guys warn you off of that idea. Excellent way to open up throttle response, both directions.

[BrazdonW]

Good deal :)
Costly?

[Yaris Hilton]

I noticed this back in the day when emission controlled vehicles became the normal and was told that a slower/controlled RPM drop reduced pollution. My guess is that todays cars rev down slowly for the same reason.

Exactly. They used to do it with mechanical dashpots on a carburetor. Now it's the ECU slowly closing the throttle.

[pfahls1]

Exactly. They used to do it with mechanical dashpots on a carburetor. Now it's the ECU slowly closing the throttle.


Yaris Hilton,

"Half a Bubble Off Plumb" - Makes me giggle.. I will remember that one for future use, if you don't mind. Cold in TN yet?:iono:

[winfong]

anyone considered DFCO..... the engine brake doesn't really kick in.....

[ddongbap]

DEFO could make more engine brake if anything.

[yaris2010RS]

i agree with the OP, it does stay at rpm's alot longer then most cars. i find not only using engine break this is a fail but also mostly shifting from 1st to 2nd(in racing or extreme conditions) the car when i push down the clutch would rev up high and the shift was rough. (it wasn't due to my error, amybe once or twice it was but i tried testing it and if my foot isn't off the gas long before i depress the clutch its gonan be a problem, lol) the computer does have a slight delay (same delay as pressing it if u even notice it) but for the most part it reacts quickly. i believe the problem is in the added weight it carries and is spinning. i hope to get my pully kit soon, lol. but i'm keeping my a/c, fuck that, lol too hot in the summer

like stalling when you flip it into neutral. my car does this all the time now!
as for your problem, my moms 2001 Camry had/has the same issue.

i will describe my problem and u follow if it fits or not

it does it sometimes, not always. (the Camry is auto) when u stop at a light or put it in N (depressing the clutch same thing) the motor will die. to turn it back on after it dies you need to give it gas and keep reving it till u drive a bit and it seems to fix its self. if the motor was hot, u turned it off and now its warm is does the same thing and u need to give gas? (this last one i jsut started to realize) when u are due for an oil change it does it more and more.

on the camry this has yet to be fixed, only really seems to die on me. my mom says she has had trouble starting it before but never died. and not gonna lie, on an 01 with over 3xx,xxxKm its not really worth it. this is my thoughts to what it is, i know most of my stuff but not sure exactly. but it could be:
dirty fuel filter (do u know i cant find the darn thing, its not where toyota said they put it)
engine sludge (i'm looking for a good way to flush it out, i know its in there....)
or bad rings/walls (i know worst case but its got over 350xxxKM on it, its old and the V6 is a bitch to work on, it took me 4 hours to change the last 3 spark plugs)

i feel i can say (i dont have the pullys but i have only read good things about them) that maybe u notce it now cuz there is less weight per revolution to keep the motor going but i doubt the issue is due to the pullys.



#2 (shut up, i'm an idiot i know) this did hapen to me while driving/working on an 1981 Jetta (grandfathers car) it was having idle issues that would run between 500rpm and 3000rpm randomly. so i decided to try an italian tune up job..... if u dont know what that is, google it and never ever try it. lol. basically u redline the car into every gear..... well redline an 81 VW engine in 3rd.....ure gonna hear a pop.... and that was it, the second my foot was on the clutch the car would die and i'd have to jump it using the next gear, and at stops i'd have to be in the gas and hold the idle. it would never ever idle no matter what unless i was giving it gas. turnes out the pop i heard was the idle screw that i blew out of the intake..... free fix at the local VW shop cuz they were so amazed to see an 81 jetta in that good of shape (only got 105xxxKm on it.)


u never know what it could be... lol

[yarisugi]

hmmm.. I'm wondering if a throttle controller (Blitz, Pilot, etc) at an aggressive setting would solve your problem.

[supmet]

2010RS, stream of consciousness is not an effective way to communicate on a forum