What stall speed for PT??

[deuce_454]

I am installing an LS1 in my 79 malibu.. the engine is recieving a head/cam package in the form fo a set of patriot CNC ported stage 2.5 5.3L heads and a tourquey cam (224/228 110LS) ive asked the question on ls1tech and they all recomend 3600-4000 rpm stall.. but while that might be great for dragracing doesnt that get OLD quick in a street/pt car??

im considering a yank3200 converter but i still think it might be a bit on the high side??? what to do??

[Steve Chryssos]

Need...
Final drive ratio:
Rear Tire Dia:
Vehicle weight:
Trans Type: 4L60E?
Min cruise RPM:
Max RPM:
Throttle Body size:
Cam Lift:
Will you dyno the engine?
Computer Type (can you adjust lock up control?):

[Steve Chryssos]

Copenhagen altitude is at se level, yes?

[deuce_454]

Final drive ratio: 3.5 or 3.73... advice.. again its a PT car
Rear Tire Dia: 27 inches
Vehicle weight: 3450 wet with driver
Trans Type: 4L60E? yep!
Min cruise RPM: 2200
Max RPM: ?? 6500
Throttle Body size: 78mm stock 2002, (=ls6 IM)
Cam Lift:.580
Will you dyno the engine?.. yep
Computer Type (can you adjust lock up control?): stock 2002.. will have manual override switch
Will install a TCI controller and a shrifter eventually!!
oh yeah.. no road in denmark above 350 ft above sealevel... copenhagen is aprox 20-30 feet in elevation

[Steve Chryssos]

3.50 or 3.73 won't matter much on an FI LS motor with regards to throttle response. Given that it's a 27" tire, I would go 60/40 in favor of the 3.73's.

Will you be drag racing this car at all? If you will only take the car to the drag strip once in its life, I would disregard maximum drag strip performance in favor of part throttle acceleration. Powering out of a corner at part throttle is way more important. To that end, I would suggest a 9.5" 2600 stall converter. Throttle response will be awesome--even at 2000rpm. That's particularly important because at 45 mph with the car in overdrive, you don't want the car to feel soggy. If you feel I am being too conservative, go ahead and choose a 2800 stall converter and be sure to run the 3.73 gears. 3000 is pushing it. There are many circumstances where a pro-touring car needs to work right at 2500-3000 rpm--especially if you choose a 3.50 gear. Also be sure to specify that you will be manually locking up the converter and therefore insist on a heavy duty lock up clutch.

I can build you exactly what you need. Price for this particular MuscleDrive converter is $759.00 including a billet front cover, anti-balloon plate, torrington bearings, machine welding, furnace brazed fins, big ass lock up clutch, and 3 year warranty.

[deuce_454]

I knew it... there had to be some reason for my gut feeling that 4000 or 3600 rpm stall wasnt great for a DD, would there be a wisdome in getting a 2800 stall for the occational (often) stoplight dash.. and then programming the transmission to stay in lockup whenever its in "manual" mode and the paddles are being used to shift??

i just think of my step dads old 325 bmw that would bog at a stoplight and only really take off halfway accross the intersection once the rpm's got up in a range where that straightbanger actually made any power!!

but ill definately give you a call and well spec the converter.. thanx a million for the reply