Optimal Converter Stall Speed / Shift Ext.
Optimal Converter Stall Speed / Shift Ext. Hey guys,
Im just wondering what my optimal converter stall speed would be given my cam specs and the power it made on the dyno and where. I feel that the 3600 is too small and my shift extension is too great. The car shifts at around 6500 and drops to 5100.
Let me make this clear, i dont care about drivability, i care about performance and that only. So what is the best number for a shift extension? 600-800 RPM?
My car made its peak torque at 5000 RPM and peak horsepower at 6300 RPM.
Once again, from a race car stand point, not a street car.
Im just wondering what my optimal converter stall speed would be given my cam specs and the power it made on the dyno and where. I feel that the 3600 is too small and my shift extension is too great. The car shifts at around 6500 and drops to 5100.
Let me make this clear, i dont care about drivability, i care about performance and that only. So what is the best number for a shift extension? 600-800 RPM?
My car made its peak torque at 5000 RPM and peak horsepower at 6300 RPM.
Once again, from a race car stand point, not a street car.
My last car had a 10 inch 4000 stall, cam peaked at like 6800 or 7,000, shift light pill was a 7,000, shifted then, car flashed to about 4,000. The 4000 was for streetability (I did not build the car). Your 3600 is way to small.
I had a TH-400 and 4.10's with a 28 inch tall tire....... I can't remember RPM drop.... going into second I was doing 75mph on 7 cylinders so I did not need many gear's...
Cam was like a 276/650 in a 468 BBC....... With a few things changed I think it would have loved a 5000 stall or so.
Send the stall in and have it taken up to a 4,000 and see how you like like..... if you had more gear that would help I think. For all out performance you cam is less then great if you ask me.
I would get a different cam and match the new stall speed to that cam and get whatever gears it says to run..... also depends on compression. My cam wanted at least 12.1 and the car had 10.5
I had a TH-400 and 4.10's with a 28 inch tall tire....... I can't remember RPM drop.... going into second I was doing 75mph on 7 cylinders so I did not need many gear's...
Cam was like a 276/650 in a 468 BBC....... With a few things changed I think it would have loved a 5000 stall or so.
Send the stall in and have it taken up to a 4,000 and see how you like like..... if you had more gear that would help I think. For all out performance you cam is less then great if you ask me.
I would get a different cam and match the new stall speed to that cam and get whatever gears it says to run..... also depends on compression. My cam wanted at least 12.1 and the car had 10.5
i understand for "all out" my cam isnt great, but its enough for a stock 103k mile LS1 with stock heads. i rather just get a proper stall to go with my cam if you know what i mean, money is tough.
Then I would get it stalled to what the cam company recomends..
It will run a lot better I bet once you do that.
A local has a 403 with a cam that is close to a T-Rex, I don't THINK the heads are ported, FAST 92 intake and he just ran 10.9 with a 4000 stall, 10 bolt with 3.42's and N/A to give you an idea...
Here is his info
LS2 403 Stroker in it with a 4l60e, Yank ss4000 stall and 3.42's (in the stock 10 bolt.) 10.993 @ 125.61 mph, 60' was a 1.659
It will run a lot better I bet once you do that.
A local has a 403 with a cam that is close to a T-Rex, I don't THINK the heads are ported, FAST 92 intake and he just ran 10.9 with a 4000 stall, 10 bolt with 3.42's and N/A to give you an idea...
Here is his info
LS2 403 Stroker in it with a 4l60e, Yank ss4000 stall and 3.42's (in the stock 10 bolt.) 10.993 @ 125.61 mph, 60' was a 1.659
The folks at PI (Vigilante) generally recommend the stall speed to be 500-900 rpm below the torque peak for a street/strip set up n/a...As yours is more race car I'd say a Vig 4400 would work very well...
--Alan
--Alan
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you need to give FTI a call. Your going to pay for it, but you wont get a better converter. Ide say you need atleast a 4400 stall. The cam peaks pretty high. Give FTI a call and talk to Greg. Give him your setup and he will hook you up with the perfect stall. Wont find any better
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Verdad Gallardo thanks for the help guys, Slowhawk reccomended at least a 4000, 4400 for the best results. i think if i can have someone help me take my converter out ill send it for a restall.
i hear vig's are very underrated, my buddy has a 4200 but it flashes to 4800 or so.
i hear vig's are very underrated, my buddy has a 4200 but it flashes to 4800 or so.
you need to give FTI a call. Your going to pay for it, but you wont get a better converter. Ide say you need atleast a 4400 stall. The cam peaks pretty high. Give FTI a call and talk to Greg. Give him your setup and he will hook you up with the perfect stall. Wont find any better
90% of the people out there will tell you the best out there are Neil Chance and ATI. I don't think he need's one of them honestly... at least not one of their top of the line stall's..
With the mods he has though I think a 4000-4400 would be about right.... 4800-5000 I think would be a little much. It is pretty much a moderate cam only car. I would think he would need more gear and cam to really make a 5000 work.... just my opinion...
What does your dyno graph look like? Other factors to consider include how much power you make at a given rpm.
I'm not 100% decided on the combo in front of the firewall, what you like to see me do?
I'm not 100% decided on the combo in front of the firewall, what you like to see me do?
something nasty thats for sure!
the graph is relitively flat, but the good stuff doesnt come on after 5000 RPM, which is my peak torque, i mean, flooring the car from a dead stop you can actually feel the cam "kick in" also look for a video of my cars 11.96 run, you can hear it there too.
the graph is relitively flat, but the good stuff doesnt come on after 5000 RPM, which is my peak torque, i mean, flooring the car from a dead stop you can actually feel the cam "kick in" also look for a video of my cars 11.96 run, you can hear it there too.
What is your raceweight?
Rear tire size?
Post your best time slip...
If you shift at 6500 you don't want to go lower than 4500 stall for the quickest ET, that's a given. But you need to hook a big stall too.
Rear tire size?
Post your best time slip...
If you shift at 6500 you don't want to go lower than 4500 stall for the quickest ET, that's a given. But you need to hook a big stall too.
race weight is 3430 with me in it but i hope to get it to around 3350
tire size is 26 inch
best time was a 1.69 60 foot, 7.61 at 91 mph in the eigth, and 11.90 at 115 in the quarter
tire size is 26 inch
best time was a 1.69 60 foot, 7.61 at 91 mph in the eigth, and 11.90 at 115 in the quarter
I ran a similar combo to that, as did some friends, back around 2000. Getting into the high 1.4's and running some 11.4-11.5's should be doable before you start looking for ways to make the car quicker (like changing intakes, electric water pumps, more gear). We mostly ran the Yank TP4400. I would run something like that at a minimum if you really want max ET.
I had a Fuddle 8" 4800 (TH400) in the 2000 white Camaro, went 1.48 NA and 1.38 150 shot. This was at 3300 raceweight. That converter was still very streetable. Was going 123mph with an unported LS2 intake, and stock water pump. Car has since gone 10.7@126mph with 5500 converter and ported FAST 90 intake, though probably not launched at full rpms.
I had a Fuddle 8" 4800 (TH400) in the 2000 white Camaro, went 1.48 NA and 1.38 150 shot. This was at 3300 raceweight. That converter was still very streetable. Was going 123mph with an unported LS2 intake, and stock water pump. Car has since gone 10.7@126mph with 5500 converter and ported FAST 90 intake, though probably not launched at full rpms.
I used a 239/242 .649"/.609" 111LSA camshaft with a stock bottom end/stock heads setup, and use an Ultimate Converter Concepts 5000 stall, and switching to 4.56 gears. I loved the setup, before my trans broke.