TC Not stalling right (cont.)

[SeattleSy#1255]

Here is the deal...stock motor/turbo..

went with a 10.5 3000 stall TC so this summer i could do a turbo upgrade, somehting like a 44...anyway...

Its stalling at 2500....i talked ot Mike Lee, who is always a great help by the way about it...he says he just can't really see it being that far off, espically for a 3000, let alone a 2800...knowing him, i would agree, i doubt its that far off...

So i called the shop that put the TC in who has a very good rep with some of the NWSYTY posse guys and is major buick guy and he assured me its in there...i have no reason to not believe him.

Mike recommened i go to a shop and have the inspection plate pulled and snap pics of the TC and send them to him and he can confirm its his...

my question is this...what other factors could be the culprid here in this thing stalling so far off...i know its not an exact science, but even Mike is surpised its this far off. He suggest its possbile its a clogged cat, but i have no indication of that which i see. Running straight pipes no mufflers, so no probs there...

what other factors may it be?

and lastly, will the stock converter stall it at 2500...Mike and I both found it amazing that it builds the same amount of boost (5psi max) off the line, floored as it did with the stocker.

I am just not seeing any difference here and mike said it sould be night and day with a stock turbo and tc at 3000...i agree!

 

[myclone]

With a 3k stall and a stock turbo you should be able to build as much boost as the brakes will hold without much effort. Ive ridden/driven trucks with high stall TCs using the stock turbo and spool up was insanely fast (for lack of a better term). It was REALLY hard to spool the turbo when launching and not over power the brakes too as you had to really be careful with the amount of throttle you applied.

Are you sure that your WG isnt leaking as that would explain the low spool up boost level? Ignition timing being off will affect it also so you have verified the correct 0 deg adv for base timing? How bout fuel pressure and/or tune? A rich condition can/will affect spool up but if its as bad as youre saying then Im thinking you would be fowling plugs like theres no tomorrow.

To check the actual stall get out on the freeway and get up to ~55mph or so and touch the brake pedal. Not enough to apply the brakes but enough to just turn on the brake lights. This will unlock the TCC and you can look at the tach to get a general idea of where the stall is. If the RPMs are running ~2200 then Id say the TC might have issues but if its 2800 or better then its prolly fine.

Hope that helps ya some.

 

[SeattleSy#1255]

Took her out on freeway to 55 or so...did the brake thing and its 2400-2500 every time...also at a launch, i can't get past 2500 rpm or 5psi, promote zero wheel spin, i can hold it all day long. You have some good thoughts on what else it could be, but looking at the above two things, it would seem to me to be pointing toward the TC or am i missing something?

what ya think?