1320Chicken

iTrader: (4)

At part throttle it shifts great. I'm back at the track today and wot it won't shift worth a damn. Last pass I dropped the shift point to 5900 and raised the limiter to 6700 and the 1-2 will bounce once and it will not shift from 2-3 unless I let off the throttle. It's leaving the line great. Just cut a 1.57 60.

Any checks I can do while I'm here? I'm starting to suspect the solenoids but I'm not sure. Fluid is clean not burnt by any means.

If anyone can post a pic of their trans tables(only web access is my iPhone) I can plug those in and take a crack at it. From the logs it's hitting both rpm and mph thresholds. I just don't know what else to do.

Mods in sig. 3600 yank and 3.73 gears. Changed from 3.42s when I installed a s60 rear.

mrvedit

Did you remember to set the both the normal and WOT shift tables for mph?

1320Chicken

iTrader: (4)

That's a negative. They just shut down for the day so I'll have to look at it when I get home.

I did notice that on the last 2 passes it would bounce then eventually shift. Meaning by the time I let out of it it had already shifted. Then coming through the traps it was on the limiter again at 6700. Seems really high for a 3.73 26" tire combo. I could understand if I was spraying it but I wasn't.

mrvedit

I think your WOT shift MPH is simply set too high. This is a typical problem when running a high stall with the factory trans shift points.

You probably already know all this, but this Sticky gives a good overview:

https://ls1tech.com/forums/automatic...tm-w-pics.html

It recommends duplicating the 90% values in the partial throttle shift table in the WOT Shift Speed table.

Personally I set my Shift speed tables corresponding to about a 6300 rpm shift, but then set my WOT shift RPM table to anywhere between 6500 and 7000 at the track. Since my shift-MPH values are fairly low, I can control my shift by only change the RPM values.

You said your trap RPM of 6700 seemed high, but didn't specify your speed. Based on tire size and gear ratio, the theoretical value can be calculated; anything over that is converter slippage which should be (well?) below 5%.

1320Chicken

iTrader: (4)

Mph was 117.

I think I just need to start from square one. I got in a hurry after the car not making a pass for over a year. I should have spent the time to do it properly.

It did the same thing last weekend. I was running a tune that I worked with frost via email. It's the same tune I have used for about three years. Only changes to the tune were to correct the speedo for the new gearing.

Mechanically I have installed the rear, a fast 92, and a nick Williams 92 tb. The car needs a tune in general but I was trying to get a baseline to work from. It doesn't appear to have any install issues, like a vaccum leak or cracking the intake. I had found somewhere on here that some of the trans functions are controlled by the same circuit as the o2s and maf. I don't know if there is a relation to my issue or not.

mrvedit

Looking at one of my log files, I hit 119 mph at 5713 rpm with 3.42 rear and 26" tires (275/40R17). A 3.73 would give me 6227 rpm (3.73/3.42x5713).
So your 6700 rpm does sound very high, either your tach is off or your converter or trans is seriously slipping.

Do have HP Tuners or other scanner to log your runs?

1320Chicken

iTrader: (4)

Yes I do and I did log a couple of the runs. I won't be able to post them up. What am I looking for to determine if the trans is slipping? I can't say that it feels like it is.

I am also suspecting that the gears may not be 3.73s. I noticed my speedo is off about 8-10 mph. I drove past one of the radar trailers on the interstate at what my speedo says was 70 and the box showed 60. So I turned on my gps and it said the same thing, cruising at 80 the GPS showed 70-72. I'm not sure how accurate either of those sources are but it's enough for me to check the ratio.

mrvedit

Sounds like you might have a 4.11. What RPM are you turning when your GPS says you are going 60mph? What is your rear tire size?

Here is an online calculator that might help you:
http://www.csgnetwork.com/rpmcalc.html

1320Chicken

iTrader: (4)

I think you're right. I just ran down the interstate with the GPS. At 60 it spun 2250-2300. At 70 2500. I used the calculator in the link and that's dead on the nose for 4.11s. Tire height comes in at 25.8(275/50/15)

I am not a happy camper about this. I'll be needing to get in touch with strange. All of my paper work lists 3.73s. I know exactly what happened too.

I'm going to jack it up, spin the pinion and count tire rotation to confirm, but like I mentioned this is totally possible. If this is the case no wonder I've been chasing my tail.

Seems like 4.11s would be ideal for me at the track as long as I'm n/a. Problem is I already have a wet kit and intend to use it. Might just run a set of 28s when I spray.

Thank you for all your help. I would have driven myself insane trying to sort this out.

1320Chicken

iTrader: (4)

Just confirmed 4.11s. Kind of pissed I wasted two trips to the track because I didn't get what I ordered.

mrvedit

Bummer.
Hopefully they will offer to pay for shipping back and forth to fix the order.
Of course still a big pain for you. My sympathies.

1320Chicken

iTrader: (4)

Eh. I might just see if I can't get them to come off with a little cash for a set of 28s. That way on spray I'll be right around 6400 and still run the 26s for na.

It's not worth it to me to pull the rear and ship it back but at the same time I'm not going to dig into my pocket to swap gears locally. If I can get them to cover the install cost I'll put that toward tires.