I am thinking for my next mod I should swap back in the stock PROM. Hypertechs seem to be expensive run rich sticks. I can do without on of those..Has anyone noticed any gains by putting their old PROM back int?

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• Red '88 IROC 305 TPI T-5 w/3.08
• Accel 300+ Ignition
• Accel 300+ Pro Sleeve Plug Wires
• AC Delco Rapid Fire Plugs
• Dual Friction Stage III Centerforce Clutch
• Energy Suspension Transmission Mount
• Flowmaster Force II 3 Chamber Cat Back Exhaust
• Gutted Airboxes
• Hypertech Stage II PROM
• Hypertech Airfoil
• Throttle Body Coolant Bypass
• Best Maryland (40 degrees) E/T 14.686, 60' 2.205, 1/8th mile 9.461, 1/4 mile MPH 93.91
• Best Florida (80 degrees) E/T 14.88, 60' 2.163, 1/8th mile 9.540, 1/4 mile MPH 92.74
• Best 60' 2.163(Florida)
• TPiS AFPR set to 42psi using Accel Fuel Pressure Gauge (Installed after Maryland run)
• Aluminum Driveshaft (Installed after Maryland run)

 

Should I move this to TPI? The PROM board is smart enough to never have used Hypertech..So I don't think that's a good idea..

 

Yarnboy: actually, post this question on the prom board. You will find a more definite answer with proof to back it up. I am also for sure though that they will tell you to ditch it.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes