PCM control boost + AGP UPPIPE?? Where to put red vac line?? - SRT Forums

sipynsyrup · 10-07-2009, 04:15 PM

As title says. I recently installed the AGP uppipe and my tunes on my diablosport just run really really lean..

After installing the uppipe i reset the ecu and capped the red vac line. Talked to AGP and they told me to tee into a boost only source so I teed into the blue vacuum line. As soon as I punch it the boost gauge pegs out and I have to let out immediately. Does the PCM need to learn it or something now??

Running FM wastegate

sipynsyrup · 10-07-2009, 06:36 PM

as I was about to take a picture... i noticed I left the vacuum line disconnected off the wastegate(I was thinking about teeing into it, but went off the blue line forgetting i took it off)...

About to go do some more test runs and see if that helped...

Did i put it in the right spot??

glenb1991 · 10-07-2009, 07:26 PM

Pretty sure the red line is supposed to be after the intercooler before the tb. It works with the white line to see the pressure difference if im not mistaken. Running it off the wg may not give it the info its supposed to have.

sipynsyrup · 10-07-2009, 08:15 PM

Quote: Originally Posted by glenb1991

Pretty sure the red line is supposed to be after the intercooler before the tb. It works with the white line to see the pressure difference if im not mistaken. Running it off the wg may not give it the info its supposed to have.

hmmm

im running it off the turbo itself (blue vac line)

Without welding a nipple in how can I go about this?

sipynsyrup · 10-07-2009, 09:05 PM

i believe that fixed it

Went for a test drive and reset parameters of the canned tune don got me. Leaving the neighborhood I got in it and it only boosted like 10psi/? WTF after a few times of hitting it, letting out I suppose the pcm learned the wastegate since it's connected once again. Spikes 19ish with 11.7 AFR and afr is 11.7-12.1 by redline...

Just added a bit of fuel up top and am very satisfied.

duster360 · 10-07-2009, 09:27 PM

Be aware that boost is limited by the PCM for low mph and low coolant temp.

sipynsyrup · 10-07-2009, 10:16 PM

well did another run for a datalog and a few pulls

As soon as I hit it it feels a tad sluggish, but boost hits 19psi (believe held 16psi to redline) and afr goes in the mid 11s from 3-4. From 4-6k afr is 12.2-12.6(LEAN) with 1-2 knk so I'm guessing once I add fuel the knock will probably go away.

Here is the datalog. Not sure how to look at everything other than knock and minor things so maybe someone can give me a hand.

Deposit Files

duster360 · 10-07-2009, 10:50 PM

As I said in my pm

Your ACT and Ambient temps are unrealistic. Part of attaining a good tune is giving the PCM as accurate data as possible.

Timing lvls look ok for as hot a the PCM think ACT and AMB is.

A 180 thermostat will help with the knock a bit. Get the A/F under 12.0 too.

btw at the logs highest RPM, 5885rpm, you're only boosting 14.7psi. It did not hold "about 16 to redline" as in your log notes.

sipynsyrup · 10-07-2009, 11:55 PM

I was told the same a while back about the act temps in an old log. Guessing this is due to Texas coast weather? I def need a 180 thermo

as far as the boost... On my cell right now so I can't look.. Thought on my first pull right before I let off at 5400 ish I saw 15.7 by map-baro... Am I reading this wrong?

So I probably have a leak? Or is that the norm?

SRTrent · 10-08-2009, 12:31 AM

damn that looks like a cluster fuck lol. when i did mine i just deleted the red line all together... i'm off of PCM controlled boost though.

duster360 · 10-08-2009, 07:40 AM

Quote: Originally Posted by sipynsyrup

I was told the same a while back about the act temps in an old log. Guessing this is due to Texas coast weather? I def need a 180 thermo

as far as the boost... On my cell right now so I can't look.. Thought on my first pull right before I let off at 5400 ish I saw 15.7 by map-baro... Am I reading this wrong?

So I probably have a leak? Or is that the norm?

You baro looks perfectly normal in this log. 14.71-14.74psi

If the real temps were in the 90s, why is your ambient temp reading 145F?!?

It should be an accurate rep of the air temp going into the air filter. Which should be within 1-2 degrees of the true ambient temp. If the ambient temp is an accurate rep and you have a POS Hot Air Intake(aka "short ram"), throw it in the gulf and use the stock box.

duster360 · 10-08-2009, 07:43 AM

Quote: Originally Posted by SRTrent

i just deleted the red line all together... i'm off of PCM controlled boost though.

Its foolish to run off PCM boost control with a DSP and a stock turbo.

sipynsyrup,,imo aftermarket bov and pos hardpipes are a complete waste of money, but regradless of that fact, leave the TIP connected like you have it.

sipynsyrup · 10-08-2009, 08:28 AM

The temp sensor that is going into the intake is bearly wedged between a rubber grommet when I bought the car. The motor does it pretty damn hot. I'll get a 180 stat and see if that changes things. Could the sensor be f'd?

duster360 · 10-08-2009, 08:54 AM

Quote: Originally Posted by sipynsyrup

The temp sensor that is going into the intake is bearly wedged between a rubber grommet when I bought the car. The motor does it pretty damn hot. I'll get a 180 stat and see if that changes things. Could the sensor be f'd?

The temp may be right if your filter is sucking hot air from the radiator fan. Is it?

glenb1991 · 10-08-2009, 09:02 AM

Like i said in my post, you cant have the red line coming off that turbo source because it will give you the air temps from there, not after the intercooler which is what its looking for.

Using the turbo to source that, as compared to the stock location, the air must run out of the turbo, through the piping, and through the intercooler. The airs temps, density and possibly even psi will change throughout that course, so your pcm is expectign it to be hotter then it really is, causing it to screw up everything else. you must have the red line somewhere between the intercooler and throttle body or it WILL NOT give the information its suppposed to be giving.