Is my STR hurting me???
Jun 11, 2007 | 12:29 AM
#1
Is my STR hurting me???
wats up guys...ever since I put my cam, I havent managed to get under a 13.3 at the track. I was expecting alot better times than that. 
...anyways, my launch is really crappy and dont know wat it is. I have a performance built tranny wit a 3400 TCI stall (the older better ones) My best 60ft. has been a 1.88 and this past wednesday I hit a 13.3 with a 1.94 60ft. 
My stall is a 2.5 STR and I was wondering if that is too much for a truck. I read somewhere 2.2 is the best for a truck, but i dont know. Could my STR be affecting my truck's launch??
...anyways, my launch is really crappy and dont know wat it is. I have a performance built tranny wit a 3400 TCI stall (the older better ones) My best 60ft. has been a 1.88 and this past wednesday I hit a 13.3 with a 1.94 60ft. My stall is a 2.5 STR and I was wondering if that is too much for a truck. I read somewhere 2.2 is the best for a truck, but i dont know. Could my STR be affecting my truck's launch??
Jun 11, 2007 | 12:42 AM
#2
yep, i ran a 12.4 with a 1.6 60ft N/A with my 3000 stall and after i switched converters to one with a tighter stator i ran a 12.9 with a 1.9x 60ft. The 12.4 was in cooler weather but that shouldnt have had a huge impact on my 60ft, I am about to switch converters. BTW my new tight one is a 3200, im going with a yank 3600.
Jun 11, 2007 | 01:34 AM
#4
that 2.5 is perfect for you. that's what i'm running with a 9.5" converter.
have you ever logged any runs at the track. with the hot weather now my truck dead hooks but only pulls in the 1.8's b/c of it going lean so it pulls timing down to 14*.
just a thought.
have you ever logged any runs at the track. with the hot weather now my truck dead hooks but only pulls in the 1.8's b/c of it going lean so it pulls timing down to 14*.
just a thought.
Jun 11, 2007 | 01:45 AM
#5
Originally Posted by bluecajun5.3
that 2.5 is perfect for you. that's what i'm running with a 9.5" converter.
have you ever logged any runs at the track. with the hot weather now my truck dead hooks but only pulls in the 1.8's b/c of it going lean so it pulls timing down to 14*.
just a thought.
have you ever logged any runs at the track. with the hot weather now my truck dead hooks but only pulls in the 1.8's b/c of it going lean so it pulls timing down to 14*.
just a thought.
Jun 16, 2007 | 09:31 AM
#6
Originally Posted by performabuilt
*Lower stall torque ratio is gentler on the tires at the initial launch, but it will pull harder for the remaining 1,305 ft. of the 1/4 mile. Less races will be lost at the starting line from excessive wheelspin.
Lower stall torque ratio will be more efficient and transmit more torque and horsepower to the tires. This translates into lower ETs and higher trap speeds!
Lower stall torque ratio will be more efficient and transmit more torque and horsepower to the tires. This translates into lower ETs and higher trap speeds!
Okay but... Being fair in comparisons here's what PI has to say about that:
"Some car enthusiasts put all kinds of money in the engine, transmission, torque converter, NOS, rear end gears, etc. then want to cripple the torque converter by lowering the STR to try and prevent wheel spin on take off. This is as foolish as pulling off one of the plug wires. Why don’t they finish the project and work on the rear suspension? Trying to tune your car by using STR is probably not very smart seeing how our competitors don’t have a clue about what STR their converters have, after all the stock torque converter you took out of your car has a STR of 1.9-1.94. "
So I would have to agree w/ PI in that if you start with performance in mind, finish the project. just my .02
Jun 16, 2007 | 09:43 AM
#7
Originally Posted by RedHot04
Okay but... Being fair in comparisons here's what PI has to say about that:
"Some car enthusiasts put all kinds of money in the engine, transmission, torque converter, NOS, rear end gears, etc. then want to cripple the torque converter by lowering the STR to try and prevent wheel spin on take off. This is as foolish as pulling off one of the plug wires. Why don’t they finish the project and work on the rear suspension? Trying to tune your car by using STR is probably not very smart seeing how our competitors don’t have a clue about what STR their converters have, after all the stock torque converter you took out of your car has a STR of 1.9-1.94. "
So I would have to agree w/ PI in that if you start with performance in mind, finish the project. just my .02
"Some car enthusiasts put all kinds of money in the engine, transmission, torque converter, NOS, rear end gears, etc. then want to cripple the torque converter by lowering the STR to try and prevent wheel spin on take off. This is as foolish as pulling off one of the plug wires. Why don’t they finish the project and work on the rear suspension? Trying to tune your car by using STR is probably not very smart seeing how our competitors don’t have a clue about what STR their converters have, after all the stock torque converter you took out of your car has a STR of 1.9-1.94. "
So I would have to agree w/ PI in that if you start with performance in mind, finish the project. just my .02
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Jun 16, 2007 | 11:45 AM
#8
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From: From Houma La. Living n Ellisville Miss.
Originally Posted by performabuilt
While I do understand the logic in finishing the suspension tires etc. But at the same time there are certain situations where using the lower STR would be the best choice, For instance you allready have the best tires your willing to put under your street car and the suspension have been setup right yet your low end torque still exceeds your ability to put it on the asphalt. There would be three options lower the power of the vehcle, Launch at a lower throttle both of which would result in wasting power or keep the ability to use the power by using a lower STR converter and spread that torque across a longer time period down the track. There is a logic to both ideologies.
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i agree with you on some things but with our trucks we have to get it rolling a race car are street car don't weight what we do on our best day at the scales.
i do know and under stand what you are saying tho and that is why alot of guys do wrok to their truck and when they put a stall in they pit up but run the same mph this is why it is sliping more on the bigger end of the track.
glad to see you coming on our side of the world
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