not shifting at WOT, hard shifts and now SES

[DeathBuzzz]

ok... i have had gears in for over a year with a Jet SCU2000. Last night my speedo stopped working. I turned off the car and set the SCU to stock gear 0 and modified 0 and it went alright. I then noticed i was hitting rev limiter at WOT. today i noticed that the shifts were REALLY hard and jerky. Now my SES light just came on. What up with this? Any suggestions?

~Brian

[DominusEtDeusNatus]

Find out what the SES light is for.

[DeathBuzzz]

I just reset the SCU back to stock 3 mod 5 and the shifts are back to normal. i am on my lunch break right now and dont have time to reset the PCM. I will do that tonight and see if the code comes back. If it does I will get it scanned.

~Brian

[strobhen]

I betcha that SES light was for a slipping transmission.

Do this, drive at about 40-60 mph, slow down to about 20, then slam the gas.

Do the rpms shoot up and the car not go anywhere? Then suddenly *BANG* you shift?

You have a slipping transmission my friend.

Have you ever shifted so hard the car has thrown you a little? That's a slipping transmission.

Does any shift last almost a second? That's a slipping transmission.

My first piece of advice is to get rid of the SCU2000, they are known to grenade transmissions.

After that, pray that you haven't hurt it too much and if the problems persist w/ out the scu, go have it serviced.

[DeathBuzzz]

<blockquote>quote:</font><hr>Originally posted by strobhen:
[QB]
My first piece of advice is to get rid of the SCU2000, they are known to grenade transmissions.
QB]<hr></blockquote>

I have never heard that anywhere. Where did you get that info?

Anyway...
i reset the PCM and the SCU2000 back to stock 3 mod 5 and everything is good now... I wonder what happened...

~Brian

[Magnus]

It's not a slipping tranny.. the problem is the Jet SCU..

it corrects speedo but does not fix shift points..

Say with 3.08 gears you shift at 42mph around 5900 RPM's.... if you put in 3.42 gears and make your speedo accurate with the Jet SCU, your PCM will wait for that 42mph to shift... but for you to reach 42mph with a 3.42 gear you have to do around 6100 RPM's or so.. but you'll hit the rev limiter at 6000 or so..

Catch my drift?

[DeathBuzzz]

Yea... I know that that is true. That is why with the SCU I dont have it set completely accurately so that I shift before redline. I set the stock gear ratio to 3 and modded ratio to 5 and the same thing with the tire size. By pushing the tire size off a little it can let the car shift off of redline. SO my speedo is now about 1-2% off ( give or take... I had a friend drive next to me at 50 mph and it was just a little off, no where near as much as without it.

Anyway, everything is all good now...

~Brian