Semopar Forum

ORT · 03-12-2011, 02:13 PM

Well, I was going to put it on today but then got wrapped up in changing the oil in the wife's jeep and changing out my egr. Maybe this week I will get a chance to put it on and see what it does.

**Redtruck-VA** · 04-13-2011, 06:21 PM

IMO, a LP booster of either brand works good on a 03 especially if you have a high stall TC which softens the shifts. I have no issues with mine.

**Redtruck-VA** · 06-12-2011, 06:16 PM

While playing with LP monitoring I finally bought a Sonnax and got good measurement off of it, the resistance that is used is 380 ohms. This goes in series on the signal wire. IMO, if you are tuning you need a LP booster. My LP sensor I got from AeroForce crapped out after a month. I don't think it could handle the constant pressure fluctuation. I'm not going to use a sensor again, but a analog gage. It'll be temporary setup just to see where I am at with the current tune and LP.

**truckin** · 06-15-2011, 01:00 AM

I can tell you with the DSP that all they do is drop the TM and do nothing to the line pressure. The sonnax is a good mod, just be sure to reset everything otherwise the the hard shifts you encounter at first turn to crap the firt time yu really get on it. Almost feels like it blew out 3rd. Reset the PCM and all was good again

**Redtruck-VA** · 06-15-2011, 08:04 AM

Before the LP sensor gave up I was ready 40-45 psi at cruise, with the transgo booster 4.7k ohm resistor wired parrallel to the sensor I got 125 psi. I expect pretty close to the same with Sonnax. This was before tuning. Manipulating the MAP voltage diffinitely alters trans settings and without having real numbers to back up what I'm saying. I wouldn't tune without having a LP booster installed. Tuning I suspect may be lowering the LP uncontrollably. I'll post my findings when I find a good gage.