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3.4 Setup Issues

Spartan GL

Spartan GL

Specialist Walter US Army
So my Mod list engine wise is as follows

3.4
Speed Daddy headers
Cat Back Exhaust
2 Magnaflow mufflers
Wizaired Cold Air Induction
3800 Performance PCM (3.4 Mail order)
Autolite 104 Sparkplugs
Ported Supercharger, Blower and Throttle boddy
ZZP Supercharger Coupler
180* T-stat
MSD Coils
MSD Wires



Issues I'm getting is I'm getting crappy MPG (14MPG ish) and it doesnt seem to have the Boost it did before i put the new PCM & 3.4 on also the Boost gauge in the DIC only goes to half way

any ideas?

did the 1/8th in like 10.1
 


i have new o2 Sensors, and I'm not getting any Codes from a scan

and i don't have a Cat converter I have headers and a catback with 2 magnaflows
 


Spartangl said:
wouldn't that throw a code?

and i know the "T" fitting under the Supercharger, and the brake booster lines where else to check?
Click to expand...


My GTP had a couple of lines with tiny cracks and the MAP sensor vac line was completely clogged and was throwing no codes.
 


swicthing gears at a higher rpm than normal... under normal driving.. that damn T boot is a culprit for half full boost gauge and if leak is bad enough it will make trans shifts funny.
 
You need to delete your bbv solenoid, i see you have it hooked up in the pic you sent me. Also, 14mpg city is not uncommon when you have your foot on it...
 


BUY A BOOST GAUGE AND STOP GUESSING AT YOUR CAR MAKING BOOST OR NOT!!

jesus christ...got all that money into your interior and you cant buy a $40 boost gauge and hook it up. that will tell you 100% if you have a vacuum leak or if you're not making 'full' boost.
 
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