Just a couple quick questions that may help me out for you guys running boosted setups.

I bought an older vette that once had a vortech, or paxton on it. The car was switched from MAF to SD ecm for the blower. Now, in my inspection of the car, Ive found 30lb injectors, an high end aftermarket fuel pump, the TB looks stock, (who knows) and on the block theres a chrome timing chain cover. That tells me someone was in there. The cars an 87 roller motor tpi. I want to try to run the car NA. I guess my question to you guys would be...

Is it normal to swap to 30lb injectors for boost?
For supercharging tpi is a cam change a must?
Is the ecm/harness swap par for the course when boost is involved? ,
If there possibly is a "blower cam" in there can the engine run decent without the blower?

I know I can work with the larger injectors, fuel pump, and I guess Im hoping they just changed the timing chain while the PO was in there.

What are your thoughts? Thanx ahead of time.

 

1) yes. when adding forced induction your brake specific fuel consumption goes up, from about .5lbs of fuel per hp per hour to about .65.
2) no. a stock cam works well for forced induction. if a cam was swapped, you would choose one with a wide lsa and a little more lift and duration on the intake than the exhaust.
3) usually yes, the ecm needs to know when positive map is present to adjust fuel and timing accordingly.
4) yes

 

Great ! So the previous owner seemed to go after it properly. Good to know.

 

a turbo cam needs about 4degrees less exh. duration than the intake duration!
a blower cam needs about 10 degrees more exhaust duration than the intake duration!
thats what I was told by a top fuel engine builder!