Which do you guys think would be better for my engine a cfi unit or the stock tbi unit i have both avaliable to me. My drivetrain specs are as follows: stock 5.0 tbi bottom end with alum. L98 heads, L98 cam.1.6 rr's. 1 5/8 shorty headers.true duals. 5 speed and 3.08 posi rearend

 

it depends if you want the easy way out or the most potential performance. the stock tbi will be an easier bolt on but cfi has shown signs of being able to make more power(torque) and get better mileage.
the heads will help and the cam woudl be good. would you happen to know what the lift will be using the 1.6rockers though? with a 305 once you get past the .465-.470lift you start getting into that fuzzy airflow area.
sounds like it would be a good combo though, especially if you have some head work done(port and polish) before the install.

later
tim

 

With the L98 cam that i have it works out441/.457 with the 1.6's btw the seperation is 114.5 .

 

sounds like a good choice then. do you know what the duration at .050 is with the 1.6's?

later
tim

 

The duration is 207/207

 

adding 1.6's add duration?? I though they only added lift...

 

As far as i know it doesnt, that is the numbers i found for this camshaft via tech articles

 

the total duration will stay the same(the time from when the valve is totally closed before opening to the time it is fully closed after opening) but the duration at .050 will change because the higher rocker ratio is lifting it to that point faster and holding it there longer.

later
tim

 

Is your car regular TBI now? If so, a CFI swap is not that tough. I am in the process of doing this swap right now. I'll tell you a little about this in case you go this route. CFI is TBI, so it wouldn't be too tough to "fool" the stock computer. CFI uses only two injectors, and one TPS. It has 2 IAC valves, but you can just wire them in parallel in place of the one. CFI intakes use the old intake bolt pattern, so to use them on 86' (?)-newer heads means you have to re-angle the center bolt holes. You may have to fab one small bracket for the A/C compressor, and move the heater valve and coil. Porting the CFI intake isn't to tough ( I'm just an 18 year-old college kid and doing just fine ), start out with a dremel tool, don't go nuts with a die grinder, the aluminum is softer than you might think. BTW, their is some CFI stuff on eBay right now. Good luck.

 

Yeah my car is tbi right now i dint figure it would be hard to adapt the ecm and wiring harness, i got the complete cfi system from an 83 camaro off ebay a year or so ago and i figured it would be neat to put on my camaro, but i dont wanna waste my time if it wont at least performas well as the tbi thats on it now.And as far as porting the intake and all that stuff i was gonna do that before i put it on. been checking out the xfire forum for all that stuff.I'm just looking for opinions on which induction would work the best with my combo.

 

I think it can perform better. I said can, if you put the stock CFI manifold on I doubt you see any real gains. You might pick up a little low end torque, but it would be choked to death on the top end. Porting and polishing the manifold helps a bunch. Have been to the CFI vault? Thats were the Crossfire guys are now, since the old forum crashed. The CFI guys help out the newbies to Crossfire Injection. If you want, I'll email you a pic of my manifold that is partially finished.