Iam gonna get my PCM custom tuned. Iam not sure which time/gear is best to lock the converter. I've heared that under WOT it is best to lock the converter in 3rd & during normal driving the converter should lock at ~40mph. Can anyone confirm this? Also is there any reason for why these settings are the best? I have 3.73 gears & SuperYank 3500 converter.

Thanks

<small>[ April 05, 2002, 05:40 AM: Message edited by: xxxhp ]</small>

 

It is a personal preference and will depend upon your cam.

Some people like to leave the car in 3rd around town and lock it up at 25 mph because it gets rid of looseness. this is ok with a stock cam or a small afermarket cam.

I have a 226 cam and prefer lock-up around 35 - 40 mph. First it avoids cam surge, and second it allows the motor to spin up if I get on it. In 4th gear I use 40 mph.

Locking up at WOT is hard on the converter and will not provide a lot of gain with the SY 3500. If you lock-up, I would wait untill you hit at least 110 mph, and maybe as high as 115 mph assuming a stock cam. For an aftermarket cam, 115 - 125 would be the range, depending on where peak HP is.

 

Mine is locking up around 45mph and it's good. Too low and the car will buck... I think I could handle 40mph but I'll try it since I have a manual lock up switch in my car.

At WOT that would be a different story, I'm not sure what is best.

 

TA, I've been in some cars when the converter is locking up to early like 30mph and the car bucks, shudders because it's too low.

The converter should lock up under WOT, I'm not sure what mph it locks at stock, but I think with my tranny we were gonna lock it at 95mph. I don't remember for sure.

 

PSJ, my car is shuddering with the converter locking at 40 in 4th. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

Nobody I have spoke to seems to have ever had this problem. Ragtop99 seems to think my IAC might be to high. I don't see how this would cause this shuddering I am feeling.

Jim

 

John, when you say buck what do you mean? I have been experiencing a shuddering effect around 40-45 mph when I am not on the gas. Is this what you are talking about? I was thinking of having Ed raise my lock-up mph to around 45-48 range?

Later

Jim

 

I will be having MTI 422 engine along with the S1 cam (244/244 @610 114LS). I thought that the stock converter does lock under WOT, right?

 

ttt