TRD04IS

the car finally went over the 1k mark after 2weeks. so i decided to test out the fuel cutoff but as i'm getting ready to open her up i see a blue rex coming fast from behind. i'm going 80 in 4th and he blazes by me so i play a little catch up and d/c rev-match to 3rd get it up to 100mph and i see he's slowing down. i pull up next to him letting of the throttle in 4th and were side by side @82mph. i look over and he gets the jump and i d/c r/m to 3rd again and i'm off where he has 3/4 car lead. 85-86-87-88-89-90-91-92mph i bump the limiter @6400. WHY? shift into 4th and this is where the reeling begins, by 100 i pull nose to nose and by 120mph he's a good 6 to 7 cars back so i take it to cut off again and it stops at 6400rpms looking at the speedo its 125mph. i look back and the scoobie is still there so i let him catch up to get a 2nd run. were side by side again @100mph so i shift back into 4th and i let him get the jump. he puts another 3/4 car lead but again i pull next to him by 110 and by 120 i'm 3 cars ahead. i see my exit about 1/2 mile ahead and i slow down to look at him and he doesn't look back. oh well!

the rex was defintely stock and stock rex's have horrible top end but get enough mods and it'll pull like freight train. anyway i was surprised at 6400 cutoff. i thought i remember seeing a post in is300.net that said that the IS cuts @6700. not only did it take me awhile to get used to shifting early but now it cuts 200rpms past redline. where i was so used to having 600rpms to play with after redline in the gts.

SDuquette

is it manual or auto, since your sig says 5 spd? If it's manual, I'll test it out

TRD04IS

its a manual but judging by my speed in each gear should show its a manual cause the auto doesn't cut out @ 92 in 3rd and 125 in 4th. also, you can't double clutch or rev-match an auto when downshifting.

Turbo'd_Wxman

You were bouncing off the rev limiter. I would not recommend doing that very often or you will be saying bye-bye to the engine and hello to some serious $$.

TRD04IS

don't know about that. i've bounced off the rev-limiter in my gts over a thousand times and never had a problem with it. that's why it was put there to begin with so you don't go past the engine's stress level. mis-shifting is what causes a lot of engine failures and poor maintainance. i've always used mobil 5w30 synthetic oil every 5k and mobil synthetic tranny fluid every 15k. looking at the IS schedule it doesn't say you should change the tranny every 30k.

irv_usc

so you're saying ~120-125 was your top speed?

maybe it's a gearing difference between the manual and autos, but i've taken my car up to 135, it did not hit the limiter yet, but i was a bit scared so i let off the gas.

Turbo'd_Wxman

Its cool if you don't believe me, but it is a fact. The IS300 will rev out at 6500 rpm. You mustang probably had a governor which is completely different. The IS300 can back off timing or play with the fuel on rev limiter.

TRD04IS

125mph was 4th gear. fastest i've gone in 5th was 145mph.

TRD04IS

6500rpms. it looked more like 6400 but whats's 100rpms between IS owners.

didn't have mustang but a 00 gts 6spd that had a redline of 7800 and didn't cutoff till 8400. god knows how many times i've bumped the limiter and 4yrs and 53k never had a problem. with the IS is the fuel being cut or is it engine ignition or both?

Turbo'd_Wxman

Not positive, but I think it severely retards the timing. Again, don't quote me on this one. lol

teton

Thanks for the post. Very enjoyable to read.

-Teton

TRD04IS

tried posting the story at is300.net but the site is acting up again.

glad you enjoyed my story.

SDuquette

Looking at the tach, 6400-6500 sounds about right, just a hair past the little red line.

flipside909

I think you're forgetting a big factor here. The 2ZZ-GE was designed by Yamaha and was allowed to be a high revving motor to reach its powerband. The 2JZ-GE on the other hand wasn't designed to be buried past it's redline. You have totally disregarded the idea that the I6 in your IS is not a torqueless motor that needs variable lift to gain power. The 2JZ wasn't designed, engineered or built to rev high. Period. The IS is in a different league than the Celica is. Drive it more responsibly or you'll be asking for a rebuild or engine swap sooner than you know it.

flipside909

IS' rev limiter is ignition controlled. The speed limiter is fuel cut.

BTW, the powerband of the 2JZ is not near redline unlike the 2ZZ.