The subject pretty much says it all. Would .472"/.496" lift be too much for the stock TPI computer?


------------------
Luke
94 Saturn SL (1.9L)
86 Camaro Berlinetta (5.0L) *TPI 350 In Progress*
Berlinetta Board Mod @3rdgen.org
Non-Tech Mod @LG4 Performance Team

 

It's not the lift that really matters. It has more to do with duration and lobe seperation. So to answer you question, no it would not be too much lift for the stock computer.

 

Plastic is right, if you stay around 210@.050 with a 114 lobe seperation angle your computer shouldn't give you any problems.

------------------
86 Iroc, 383 Ported Sportsman II, Ported RPM Airgap, 750 Holley Vac. Sec., Slp 1 3/4, Comp Cams roller 218 224, 10" 2600 stall, Fairbanks 700r-4 W/superflow pro pump, 9" disk 3.70, 12.969@106.54 1.991 60', new times in spring
87 K30 Chevy P/U 355 TPI TH400, headers and 2 1/2 duals, flowmasters, 8" lift, 36" super swampers, 4.10 detroit lockers, 383 edelbrock heads in progress

 

Ok, thanks guys. It looks like I'll be getting a custom chip anyway.

------------------
Luke
94 Saturn SL (1.9L)
86 Camaro Berlinetta (5.0L) *TPI 350 In Progress*
Berlinetta Board Mod @3rdgen.org
Non-Tech Mod @LG4 Performance Team

 

I bet that even an after market chip like a Performance Resource or Hypertech would do the trick too.

------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Next on the list: LT4 HOT Cam

 

Naah... All they do is increase timing by a couple degrees and lock up the torque convertor like 4-5 mph higher. For they money, they're a ripoff.

------------------
92 Z28 L98 350
---------------
Ported stock heads, XR270HR-10 cam, TES headers, Crane AFPR, Flowmaster catback, MSD ignition components.
Best ET 13.5@105 mph
"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)
Click here to see my car at Truspeed.org

Check out TruSpeed at http://www.truspeed.org
Check out the Bin Archive at http://www.truspeed.org/bins.html

 

I agree with Blade, those "off the shelf" PROMs are not that good and definitely not worth the money you pay. You are far better off getting the equipment to burn your own PROM.

Goto Traxions's article https://www.thirdgen.org/newdesign/tech/promintro.shtml on how to burn a PROM, it really isn't that hard.

 

I am running a 355ci. sportsman 11 heads with major porting, LT4 Hot cam measured at 221/231 duration, and .525/.525 lift, 1.6 Comp cams pro magnum roller rockers, tons of other stuff and I am running the stock computer and stock 305 TPI chip. I have a DFI for the car and know the thing will run better, but I have been on the road this way for about a year and drive it daily. Speed density is not as sensitive as many say. Oh, I am also running a Pete Jackson gear drive...

------------------
91 Camaro TPI, 355ci. Sportsman 11 heads, Hot cam, on,and on, and on... 13.6 @ 102.5 with a 2:73 open rear, no traction, no tuning, no practice.