oner

...rpm launches.

1)If I were to order a 4000 would I be able to stall all the way to 4000 (lock up)? I was told its all based on the weight of your car and mods. But is there a way to make sure you really get a stall that stalls all the way?

2) I was aslo told that a stock minor bolt-on ls1 should stick with a 3600 stall because my torque should peak aroud thereand if thats the case why can M6 guys dump the clutch @ 5k.

Any help would be appreciated I want to only have to buy a converter once and not have to upgrade later.

--thanks

BlackHawk T/A

iTrader: (3)

When you order a Yank its made to perform at its rated specs in your car. It should be very close unless you are quite a bit lighter, or heavier than stock or are using a power adder in which case they would take that into consideration. This is assuming you talk to them instead of ordering a ready-to-go unit.

And don't confuse lockup with flash stall, two different things there.

300bhp/ton

stock LS1's make PEAK torque at about 4400rpm

oner

Whats the difference?

oner

so I could possibly get a stall to 4400rpm!!! I want it!!!

s346k

iTrader: (4)

they do?

all the stock graphs i've seen were closer to 3,200.

possibly a full bolt-on car could peak that high, but not likely.

300bhp/ton

Well the great thing about the LS1 is it has a broad flat torque curve. It makes 90% of it's torque by 1500rpm (which incidently is more than an LT1 makes at PEAK) and will hold it all the way to ~4400rpm where as an LT1 is out by 2500rpm.

And because HP = torque x rpm / 5252 it means the more torque you make higher in the rpm's the more bhp produced

Wilder cams will simply move the torque band up the rpms (as well as an increase in curve profile and PEAK) this is what gives you more bhp with cammed setups, the down side is you end up with less power in the lower rpms until you move further up the torque curve.

300bhp/ton

Here's a dyno graph for a STOCK LS1:


Make sure you note the scale for the torque (lb ft) which is on the left as the scale makes the graph look steep when infact it is actually quite flat.

At 1500rpm the LS1 is making ~330lb ft (LT1 only makes 325lb ft PEAK ).

As you can see the LS1's PEAK torque occurs between 4000-4500rpm (there is a slight spike at 4100rpm, but I think that's all it is - a spike and as the curve should be fairly smooth) if you follow the line you can see the 'real' PEAK is just under 4500rpm which is an impressive 370lb ft