Auto GT-S fuel cut-off at lower RPM than 6-speed GT-S. Why?

[Erik00AutoGT-S]

If I'm right, the fuel cut-off on a 6-speed GTS is around 8300 RPM when it's at around 7800 on an Auto GT-S. Anyone knows why? Since both cars share the same engine, would it be wrong to change the fuel cut-off from 7800 to 8300 RPM on the Auto GT-S? If not, how can I do that?

Thanks for your answers/comments.

[larryd]

i dont know the answer but the fuel cut on the 02 6spd is 7700..

[lnux-rhat]

why would you need the fuel cut off be at 8300? To land on the second cam? :)
It would be possible, if auto GTS had 6speed, but with a 4-speed transmission there's no even a single chance

The computer knows better when to shift or cut fuel.

[Erik00AutoGT-S]

Originally posted by lnux-rhat
why would you need the fuel cut off be at 8300? To land on the second cam? :)
It would be possible, if auto GTS had 6speed, but with a 4-speed transmission there's no even a single chance

The computer knows better when to shift or cut fuel.

For the sound of the engine! The sound!! And probably for the same reasons why those who have a 02 GT-S would like to have a higher fuel cut-off besides landing on the big cam. Also, to land at 5000 higher RPM when up-shifting would certainly make a difference. I know it is impossible with a 4-speed transmission to land on the big cam when up-shifting, but I certainly would appreciate landing 4000/5000 RPM higher, especially with nitrous oxyde.

I don't totally agree with that. For fuel economy, the computer knows better when to shift. But for sport driving on a twisting road, the computer would up-shift when I would want to stay, for example, in 2nd gear entering or exiting a curve. Same thing for down-shifting; it has to be done manually in the sequential shifting mode.

[00RedGTS]

mine use to redline at 8300 but when my CEL came on i noticed toyota dealership knocked it down to 8000.

[Erik00AutoGT-S]

Originally posted by 00RedGTS
mine use to redline at 8300 but when my CEL came on i noticed toyota dealership knocked it down to 8000.

What year is your car? Auto or 6-speed? Then, the dealer would probably be able to put it back to 8300!

[00RedGTS]

it's an auto. i'm not worried about it getting back to 8300 because i always shifted at 8000 anyway. i hardly ever drive it anymore anyway. i've got a company car.

[Erik00AutoGT-S]

Originally posted by 00RedGTS
it's an auto. i'm not worried about it getting back to 8300 because i always shifted at 8000 anyway. i hardly ever drive it anymore anyway. i've got a company car.

And also, the peak HP is below fuel cut-off. Around 7500 RPM if I remember well. You hardly drive it anymore! Do you miss it?

[larryd]

on a manual with Injen intake the peak hp is actually at 8300..

[Erik00AutoGT-S]

Originally posted by larryd
on a manual with Injen intake the peak hp is actually at 8300..

Here's another good reason to have the fuel cut-off at 8300! I want to put an Injen CAI. What about peak torque? A bit lower than peak HP, I assume.

[t2000gts]

the higher fuel cut would definitely help an auto GTS...specifically in it pulling harder at 7800-8300 in a lower gear than it does at 4900-5200 in a higher gear (where it drops on shifts). a LOT harder. that's almost 500 extra rpm of vvtl-i!

and you would ALMOST just barely be able to make the 3-4 shift at around mid 130s mph and stay in vvtl-i. just for reference. not that i recommend trying it ;)

like when 2nd hits fuel cutoff at 7800rpm, that's about 82mph. the 6-speed winds 3rd out to like 85-88mph...that little extra oomph right at the end of the gears would make a huge difference in trap speeds for one thing.

also 3rd hits 6000rpm at 97mph, and hits 7800rpm cutoff at 123-124mph. the gearing of 3rd is weaker than a 6-speed's 4th (which runs to low 110s) but is stronger than a 6-speed's 5th which is what it uses for anything over 115mph...with a 8300rpm cutoff, the auto GTS would have a significant gearing advantage over 115mph all the way to 135mph. almost 137-140 with 8500-8600rpm cutoff. plus the fact that it doesn't shift at 115mph and has peak torque at 110mph helps make up for the weaker gearing at 100-110.

also with a 8500rpm cutoff, first would hit lift from around 35ish to almost 47 mph (44-45 at stock limiter at 7800rpm). it still pulls hard right during and after the shift, but runs out of steam as it approaches high 50s to 60mph, and that extra delay from 60-65 (5800-6200) is madenning.

[t2000gts]

oh yeah. peak torque is usually around 6700-7000rpm :D

[hollywood]

my 2000 auto gts is at about 7913. thats as high as i have seen so far.

[t2000gts]

uh...do you have an SAFC or just really good eyes? :D

[Erik00AutoGT-S]

Originally posted by t2000gts
uh...do you have an SAFC or just really good eyes? :D

Or good ears! ;-)

[Pure Racer]

If you hit the rev limiter in Sportshifts, you can get a little higher then 8k rpm :)

[hollywood]

haha i have s-afc

[t2000gts]

when i bounce off it for a while it runs around from 7800-7900, but never makes it to 8000 :)

[Jake_VVTL-i]

My limiter don't kick in until a little past 8200. I don't usually even hit the up shift button until 7900 rpms. I hit the limiter a couple of times though and it was up around 8200. Maybe even a little over.

Jake