Just was wondering........what's the difference from MAF and the speed density system?

 

MAF uses a Mass Air Flow Sensor that measures the amount of air coming in.

and SD uses pressure in the intake manifold (I think) So it'sjust differnet ways to measure the intake air.

Just wondering...Have you driven/rode in any 350 TPI cars? If so how does your TBI 350 Compare? I don't think it would be too much slower...I might be wrong.

 

No i can't say i have riden or drove in a 350 with tbi vs. one with tpi but i put the stock manifold and tbi unit off the 305 and didn't change the injectors. So the car kinda falls on its face around the 4000 rpm range. A friend that i work with had a buddy that had a either 89 or 90 iroc with a 350 tpi set up that he took off and was going to stick it on his S-10 but changed his mind and sold it to me. But imagine there has to be a big difference for me to go to tpi.