Jetpilot

Actually TQ should be the same or higher for a given rpm with a tighter TC. The speed at which you obtain a a given rpm will change though..... Choosing the proper TC is very important when upgrading a tranny its not "one size fits all". The TC needs to be matched to the engines HP output and customers intended use.

Doug

RowJ

Thanks Doug! That finally explains one of the big differences I noticed when I installed my DTT. My low end torque felt noticably stronger....but I was reasoning it backwards.....knew I liked the results but could not figure out the why?

RJ

Mcmopar

I just ordered a pile of DG parts for my tranny, I will install them this weekend and install the tranny over the Holiday!!

RickCJ

OK but with a stock engine the tighter tc will make it bog until the rpm and boost get higher.

I quess that's why you have them set-up for the hp level you are at!

When I turn the comp box off the truck will bog at low rpms' with the comp on the truck has enough power to pull at low rpms.

Jetpilot

Rick,

Is the bog you describe with your 5 speed truck? An automatic truck has totally different driving characteristics than a manual..... Both have their plus' and minus'. But normally speaking even the tightest TC will come up onto rpm quicker than a manual if conditions are equal. Also you comp box changes a lot more than just adding fuel there is timing of the injection event etc.

Doug

RickCJ

Doug,
I'm talking auto trucks, a stock truck with an 89 DTT will bog really bad at low rpm's, under 1600, where a stock tc will be so loose it will never be below 2000 rpm. Yes a DTT tc is night and day better than stock!!
Rick

Fred Swanson

By turning the Comp off, you did away with the timing advance, which will make it seem slower off the line, until the boost hits. Like Doug has been stating, you have to match the TC to the power. What's why timing is critical, on 12 and 24V trucks.

It may seem slower, but in actuality, the truck starts moving sooner than with a stock TC, especially with a load.