I posted in the wrong section earlier. Oops... My trans is pretty fresh and it currently has a stock converter in it. When going from a dead stop with the car in D, it does fine, just shifts a little early due to wheel spin and I know that is normal. But if I pull it into manual 1 and foot brake at all, it starts in 2nd and then when I come off the line, it'll downshift into 1st. If I go from a 1st gear roll, it shifts into 2nd automatically too early even with the shifter in the 1 position. If I let off after it shifts into 2nd, it'll downshift back into 1st. I can't even do a burn out in the car with it in manual 1. What the hell?!?! I do have a scan tool and the computer is saying that it's in 1 the whole time... Even starting out in D and pulling it into 1 after the launch, it still shifts itself with the scanner reading 1 the whole time. I like to be able to pedal 1st gear out of the hole so it doesn't shift into 2nd too early. Does anyone have any suggestions on what this could be???

 

With what scanner? If this is an LT1 car?.....Take live data with a grain of salt if your not using a Tech 2.

A good tune would most likely fix your issues.

 

It's a 2002 Formula, LS1 car. I've used HPtuners right with the scanner I use and they give the exact same data. The car has a very, very mild tune in it. I wonder if the torque management could play a role in this? A cam/stall is going in during this time next month and it will have a relatively aggressive tune on it (400+whp hopefully cam/headers only) so maybe that will fix the issue. It's just confusing me why the computer is commanding 1st and it's in 2nd... the scanner has never been wrong before. I've diagnosed a **** ton of LS1 cars with it, including my own. It's the reason I found out cylinder #7 was misfiring. Can't feel it at all, so I thought it might be wrong. I checked compression and it's 90psi on #7. All the others are 160psi. I think a ring or valve is bad. I put a snake camera into the cylinder head and the valves looked fine on camera, but who knows. I'm going to have it all replaced when the cam goes in.

 

Interesting, you are the 2nd person in the past month to report strange shifting (into 2nd) while in Manual 1. Don't think the other OP's problem was ever figured out.
I would start by making sure the trans selector is fully in 1st gear when the shifter is in D1.

Since you have HP Tuners there is little reason to ever need Manual-1 as you can tune the desired shift point and different throttle positions.

 

If the scanner says it's in 1st the whole time how can you tell it's going to second or just binding up, or going into a different gear?

 

A common problem is low line pressure. Check it and post it here.

 

97TA , I had the same problem( 4l60e ) . I could put it into first trying to go from a 20 roll and stomp it , but before I got to 20 it would shift into 2nd while I had it in first and if I stomp on it it would down shift into first again and up shift fine after that . I think it also would shift even if I powered hard past 20 while in first .

It has been quite some time and I cant remember the exact details , but there was some perimeters in the tune that fixed mine and has been rock solid . Cant remember if it was looking at rpm or speed . I think it was speed . It was in the HP trans perimeters . Just keep looking in the trans setting . Once we found it we fixed 2 vehicles .

 

Doubt it. Stock trans, stock converter. Should work properly. Might find a bandaid in tuning. Doesn't mean it's right.

 

If I try to power brake it to do a burnout or get on the brake before leaving, it will go into 2nd for sure. As soon as I come off the line and let off a little, it will downshift. It is definitely in 2nd. I know I can change shift points and whatnot but I like to be able to tell it when to go into 2nd due to wheel spin in 1st. At the track, I just leave it in D and take off and it hooks up, but on the street, it will blow the tires off until it goes into 3rd if I leave at WOT. I can't peddle in in 1st with it in D because it will shift too early. I also can't do a burnout in manual 1st because it goes into 2nd. I'm going to have Lane Culver look it towards the end of this month when he puts the cam in and tunes it.

 

I hope that my issue is in the tune. Hopefully it will be straightened out when the cam goes in.

 

I'm just hoping that it isn't in the trans again. I've had 8 rebuilds on the old core and PTC finally gave me a different rebuilt core and the pump broke due to the converter being built wrong after 1,500 miles.. Pulled the trans, swapped pumps, and put a different OEM converter in it and its held up fine other than this issue. It has been doing this for a while now.

 

So did they completely disassemble it and clean it after the pump/converter failure?

I'd get it working properly before going any further.
Putting a cam and converter in something with problems is asking for a serious headache.

 

It works fine with it in D, that's why I am thinking that it's something in the tune that's just funky.

 

Post the tune, I'll tell you what it is. I've done more transmission tuning than engine tuning. You say it's a 2002 right?

Or if you don't want the tune posted, why not put a stock tune in it and try.

Both my cars work fine, they don't do what your talking about.

The difference between D and OD is the overrun clutch being applied.
I don't see that causing your problem though.

 

I would post the tune if I could. I personally do not have HPtuners but I had the guy that tuned it put the stock trans tune back on it when I had all the transmission problems. It was still dropping transmissions even with the stock tune until they gave me a different core. I could see if he can send me the file because I know that he still has it. Yes, it is a 2002.