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  #13  
Old 06-04-2012, 02:12 PM
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Re: Throttle body spacer? 4.7 not HO

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Originally Posted by djluski View Post
i am just noticing this post. i recently installed a TB spacer and here are my observations: 1) my 4.7 seems to experience "turbo lag". like i step on the gas and it lags for a second then takes off like a rocket. 2) it recently became hard to start.

with all that said, can someone please explain the transmission mods explained above?
The torque management snip prevents a lag in the engine when the transmission shifts up under 80%+ throttle.

The transo is a shift kit that has some heavy duty springs and accumulator plate for the valve body (can be done without removing the tranmission) and also has some tougher snap rings to go on the pump (requires dropping the tranny, but not necessary to do with the springs). It makes for quicker shifts.

The shift solenoid is known to cause some shifting problems on the older 545rfe transmissions. I have to replace mine soon, it keeps throwing codes and going into limp mode. This device is basically the "muscles" controlled by the "brain" or transmission control module. (or the closest I could get with a metaphor )
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Old 06-04-2012, 09:50 PM
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Re: Throttle body spacer? 4.7 not HO

The timing retard is commanded by engine rpm at time of shift. Shift points are laid out in output shaft speed by TPS voltage. So to supplement the post above, the timing retard command only happens under more aggressive throttle.
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Old 06-05-2012, 09:37 AM
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Re: Throttle body spacer? 4.7 not HO

Quote:
Originally Posted by FlyinRyan View Post
The timing retard is commanded by engine rpm at time of shift. Shift points are laid out in output shaft speed by TPS voltage. So to supplement the post above, the timing retard command only happens under more aggressive throttle.
Thanks for the extra info ryan! You are definitely the go to guy around here on programming/tuning.
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