New Years Tech Questions

Reply Subscribe

Thread Tools

Search this Thread

01-07-2012, 09:14 PM

#21

Jake's Performance

FormerVendor

Thread Starter

iTrader: (2)

Join Date: Oct 2010

Posts: 1,774

Likes: 5

Received 23 Likes on 20 Posts

Quote:

Originally Posted by DietCoke

It looks like the optishift is setup to read tps as 0-5v. The issue I have is my WOT voltage is LOW (~0.8v), and idle voltage is high (~3.55v). The optishift wants/expects the opposite (low voltage at idle, high when open). How do I combat this?

That may be a question for Baumann.
If the voltage is correct and "backwards" on the later model cars, we may have to have them reconfigured software wise.

Reply Like

01-07-2012, 09:17 PM

#22

Jake's Performance

FormerVendor

Thread Starter

iTrader: (2)

Join Date: Oct 2010

Posts: 1,774

Likes: 5

Received 23 Likes on 20 Posts

Quote:

Originally Posted by midwestjunk

Here's another quick question for you. With my rmvb race built th400, when i'm cruising around in the pits in 1st gear can you let off to come to a stop or must you shift to 3rd even at 10mph just so you can let off the throttle? or say i back it out of my driveway and drive in around my neighborhood can i let off at low speeds or must you get it into 3rd every time before you lift your foot off the pedal?

You can lift in any gear without worry, you don't want to lift in low or 2nd and then stab the throttle again and allow the engine to " get a run" at the transmission while it is in overrun (freewheel) mode. You want to ease back into the throttle and let it "catch" again.

Reply Like

01-07-2012, 09:33 PM

#23

DietCoke

10 Second Club

iTrader: (18)

Join Date: Mar 2004

Location: Richmond Hill, GA

Posts: 3,869

Likes: 1

Received 55 Likes on 48 Posts

Quote:

Originally Posted by Jake's Performance

That may be a question for Baumann.
If the voltage is correct and "backwards" on the later model cars, we may have to have them reconfigured software wise.

Figured out a solution and just used the potentiometer from the gas pedal (light blue wire out of the six). The resolution isnt as good (0.45 -> 2.8v) as the throttle body sensor, but it seems to work and drive okay.

Reply Like

01-08-2012, 12:40 PM

#24

slow67

Gingervitis Addict

iTrader: (2)

Join Date: Nov 2004

Location: DFW

Posts: 2,399

Likes: 0

Received 2 Likes on 2 Posts

Quote:

Originally Posted by DietCoke

Check the voltage on the other TPS wire, it should be low at 0% and higher at WOT.

Reply Like

01-08-2012, 04:06 PM

#25

DietCoke

10 Second Club

iTrader: (18)

Join Date: Mar 2004

Location: Richmond Hill, GA

Posts: 3,869

Likes: 1

Received 55 Likes on 48 Posts

Quote:

Originally Posted by slow67

Check the voltage on the other TPS wire, it should be low at 0% and higher at WOT.

There is no other wire. It works with the gas pedal (pretty well, actually) so I'm just going to leave it at that.

Reply Like

01-22-2012, 03:42 AM

#26

SnIpEz

TECH Resident

iTrader: (4)

Join Date: Sep 2009

Location: League City, TX

Posts: 979

Likes: 5

Received 13 Likes on 13 Posts

I have a question. In a 4L80E pump, when the boost valve is activated by torque signal fluid pressure from the EPC solenoid, that causes it to move against the pressure regulator spring correct?

What I'm having trouble understanding (and this could very well be because it's very late and my brain is cooked) is how does the solenoid control the fluid pressure leading up to the boost valve? I realize it's controlled by a signal, but I don't understand how a signal changes the pressure. If that makes any sense. Alright I'm going to bed, I hope this information will be more fresh and available in my head in the morning.

Reply Like

Reply Subscribe