parish8

iTrader: (6)

i have a 3rd hand performabuilt level2 4l60e in my car that is probably 3 years old.

car is a is300 with a cam only ls1 and a rear mount china t76 running mid 10's.

right now i am at 12psi(550rwhp) and would like to turn it up. my rear gears are steep and my tires are kinda short meaning i am well into 4th gear during a 1/4 mile run. swapping gears might by on my list of things to do but there is no easy way to do it in this car.

i have a speed based boost controller so i can vary the power per gear. i am looking to turn it up and would like to get as far as i can with this tranny before breaking it. i am looking for info on which gears can handle the most power and which i should hit with less power?

mrvedit

First I think this shows how well built Performabuilt's entry level-2 is. Three different owners and now running mid 10s with 550 rwhp. Sounds well built to me; this should help satisfy the doubters.

Frank from Performabuilt really needs to answer this.
I don't know if it has billet servos, especially the 4th gear billet servo piston needed to prevent slippage in 4th gear. If not, this could be easily added by you.

Part of the answer might depend upon whether you are using torque management to reduce power during the shifts. You can generally get a lot more power through a trans with torque management.

Ted.

performabuilt

iTrader: (25)

The weakest link as always with the 4l60e is the 3-4 clutch pack so i would say during the 2-3 shift if I was gonna cut back. when going to 4th while the 3-4 set is on its fully applied so you should be fine with the sonnax billet servo and wide band and also good on the 1-2

parish8

iTrader: (6)

thanks for your help.

i am not clear on what you are saying above.

lets say i have 7 events to work with. 1st, 1-2 shift, 2nd, 2-3 shift, 3rd, 3-4 shift, 4th.

which of those times would i want to run less power?

i can soften the shifts with some tq management and/or run less power mid gear with speed based boost controller.

mrvedit

Oops, I think Frank and I both overlooked your question.

Be easiest on the 2-3 shift as you don't want the 3-4 clutch slipping as it engages.

I interpret that the trans has a billet servo, and therefore can handle strong 1-2 and 3-4 shifts.
Personally I would tune some torque reduction for the shifts, more for the 2-3.
I'm just quessing here - perhaps 35% for the 2-3 and 25% for the 1-2 and 3-4.

performabuilt

iTrader: (25)

Yes be easiest during the 2-3 shift

parish8

iTrader: (6)

thanks. thats exactly what i was looking for.

i plan on slowly turning it up till something breaks. :-)

mrvedit

Keep us posted when it breaks and at what power or ET.

Sounds like a great car. Do you have pics of the swap?

I see you have been on ls1tech for a long time and almost 10,000 posts! Wow.
Looks like you participate on many topics.
Did you first swap into a 67 Nova? And/or other cars too?

parish8

iTrader: (6)

i will let you know what breaks when.

sure i have pics. http://neufamily.org/images/is300gallery/
i put the turbo on later and dont have any pics of that in the gallery. it is a china 76 mounted at the back. this is how it looks other than i cleaned up the rest of that wiring on the drivers side.





i have been around awhile. most of my posts are from back when i had a turbo truck. since then we/i did a turbo 5.3 fairmont, twin turbo 5.3 nova wagon, twin turbo g8, turbo 6.0 mustang hatch and now my lexus.