Converter ineffeciency
Converter ineffeciency I have a 98 Camaro with a 4L60e and a torque converter with 3600rpm stall. I'm wondering if a worsening 60' while increased horsepower is a sign of a poor torque converter efficiency.
My car with stock ls1 and bolt-ons made 305rwhp got 1.796 60' times
I added a ms3 cam, bumped the hp up to 357whp and got 1.821 60'
Now I have a fully build forged bottom end and heads/ nitrous cam/intake I'm at 425whp and just got 1.886 60'
The only part that is still in the car from 305hp setup to the 425 setup is the torque converter. I'm just looking for what could me causing the poor 60'. It's not losing traction, the car did the 1.796 with completely stock suspension and now the car suspension has improve with adjustable shocks. The car makes 100rwhp more and weights 400lbs less but has a worst 60' and is only .7 and 8mph quicker.
I'm at a loss and would like others thoughts and opinions.
My car with stock ls1 and bolt-ons made 305rwhp got 1.796 60' times
I added a ms3 cam, bumped the hp up to 357whp and got 1.821 60'
Now I have a fully build forged bottom end and heads/ nitrous cam/intake I'm at 425whp and just got 1.886 60'
The only part that is still in the car from 305hp setup to the 425 setup is the torque converter. I'm just looking for what could me causing the poor 60'. It's not losing traction, the car did the 1.796 with completely stock suspension and now the car suspension has improve with adjustable shocks. The car makes 100rwhp more and weights 400lbs less but has a worst 60' and is only .7 and 8mph quicker.
I'm at a loss and would like others thoughts and opinions.
The converter is a Edge Racing Pro series w/3600 stall
The rear end is a 9" with 3.70 gear, but I'm on a 28" tire now versus the 26" tire and 3.23 gear that was in the 10 bolt.
The rear end is a 9" with 3.70 gear, but I'm on a 28" tire now versus the 26" tire and 3.23 gear that was in the 10 bolt.
TECH Resident
Joined: May 2006
Posts: 969
Likes: 119
What are the camshaft specs at .050" lift? The duration and the lobe separation? Assuming these times are the combined average for each event, and not drastic changes in the weather, then the main reason that I see here for the slight loss is the Ford 9" eats a lot more horsepower than the 7.5" rear end. I have seen this a few times over the years. The camshaft specs might tell us something.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
It does show power loss due to rotating mass but not much. The main problem with the 9 inch is the gear mesh. The relationship of the pinion and ring gear cause more drag then other designs.
I agree on the mesh but again most of the people who worry about it, are mentally masturbating. It doesn't matter on the typical street/strip car.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Hot rod did a test between the 12, s60, and 9 inch. It IS worth something on a dyno. While this amount probably doesnt matter to most people for some it does. I recently swapped a 28lb truetrac for a LW 8lb spool. I did it only for the weight/drag savings, no other reason. But I realize im not the norm. I bring it up because its a mentality, if you approach all your mods with the thought of weight, drag, etc and you put it all together at the end of the day it all adds up and gives your car an advantage over the next guy who didnt think that way.