Ive was talkin to a friend of mine who has a sc3 and i was talking to him about getting sc4 he was telling me that the sc4 tranny pull slow and it takes longer to shift then the sc3 thats why the times on the 1/4 mile are close its more power but takes longer to shift is that true?? Please help

 

yeah the trans are different between the two, i don't quite remember what it is though.

 

are we talking auto vs auto or auto vs manual? And is this pre-98, cause I really dont think a 98+ Sc400 would have any trouble beating and SC300 even a manual one. 5 spd vs 4 spd (manual or not) is a no brainer who's got the advantage tranny wise. As far as I know, the official stats for 1992 were:
SC400: 0-60 = 6.9 sec, 1/4 mile = 15.3 sec
SC300 (man): 0-60 = 7.4 sec, 1/4 mile = 15.6 sec

 

oh wow yeah the 98sc4 has a 5speed-auto and the 93sc3 man...

 

Wrong. Prior to 1998, both cars were offered with the A343E 4-speed auto.


So, JDM, as Brendon posted the 1/4 mile times are not as close as your friend saying. And in a stock for stock match-up between auto trans SC3 vs SC4, the SC4 will be ahead all day long.

 

That's not true, they might be the same series but they are in fact different. I know this cause I wanted to buy the surpastick for my sc4, but it's not supported. I think it's the way it controls line pressure

 

If I'm not mistaken, the SC400 AT (pre 98) is the same trans as the TT Supra. It's not the quickest shifting for sure, but not enough to hold it back against an SC300. Trust me, stock for stock the SC400 will put carlengths between the two.

 

I'll check when I get home tonight. I have the shop manual for the SC3/4. It may shed some light on differences between the 2, if any.

 

They are not the same transmission until I think 98.

The Suprastick can be used on on the SC400 A340e. There are 4 solenoids, no1 shift solenoid, no 2 shift solenoid, tc lockup solenoid, and the no 4 solenoid is for accumulator back pressure control. The Suprastick can control the first three and the no 4 solenoid is not needed, in fact, I'd reccomend to anyone that it be disconnected anyway.

KC

 

The thing about the SC400 is not necessarily the transmission which gets slower shifting times, its that the torque converter limits the transmissions quick shifting at low speeds. First gear is quick its the 2nd gear 15-35 MPH which lags. ince 3rd gear kicks in your around 40 it pulls quicker then first and second gear.

 

head for head, you might think the SC300 manual should be able to hold up against an early SC400. After all, its got the advantage of better gearing, less weight, and less drivetrain loss; however, when it comes to real world, the SC400 wins hands down in a race.

If you ask me, I think the 1UZ's torque is what gives it the edge over the 2JZ. Its putting down 50 more ft-lbs, and at an earlier RPM.

 

REALLY? I called them and they told me it's not supported! I'm like anyone else, I don't want to try something that MIGHT work. Speaking of which why don't you do it? It might fix your rev bounce issue

 

There is no reason why it shouldn't work as long as you don't mind not using the no 4 solenoid. They likely know that the 400 trans has the 4th solenoid, which the Suprastick cannot control, but again, it's not needed.

If the transmission has a cable going to the throttle body, the line pressure is controled by a throttle valve in the valve body of the trans. The throttle valve is actuated by the cable on the throttle body directly affection main line pressure.

If the transmission does not have a cable to the throttle body, then the line pressure is controlled by a solenoid and the Suprastick will not work.

I have thought about the Suprastick many times. It would very likely fix my problem since I could program it to shift say 100rpm earlier. I have not bought one yet because I am poor at the moment. BTW, the rev bounce problem is a million times better since putting in the new trans. I'm hoping that this trans will last since I modified it BEFORE beating on it...fingers crossed.

KC