Is there an advantage to using the Holley manifold and Throttle Body vs the side draft Unit? If I went with the side draft I could use my existing manifold.
Thanks,
Ed

 

None that I can see. Theoretically best to worst goes something like dual sidedraft - single side draft (next to engine) - Holley - IDA - curl-over side draft, but in practice it doesn't make that huge of a difference compared to all of the OTHER little things.

 

Thanks, then a 50mm sidedraft it is

 

like PJ says, its sort of bends in intake and runner length vs health and porting of the engine and the exhaust matters, as does the fueling and ignition the flywheel, gearing, the overall weight of the car, plus driving position, brakes, etc etc etc.

as long as you're in the ballpark with the intake, there are bigger fish to fry

 

So here is where I am at. I am going with a dcoe type TB, trying to understand the benefits of TWM vs EFI Hardware. I am going to go with MS3 Pro as an ECU, and since I am running a distributor now I am going to go with a Full Function Engineering Hall Effect Crank Trigger.

Any thoughts on TWM vs EFI Hardware? Also, any thoughts on 2 vs 4 injectors? Finally, I have the six port actuators wired open, does this matter? The car is only 1350lbs and it doesn't seem to make a difference. The engine is street ported with a racing beat header, pre silencer and borla exhaust.

Thanks,
Ed

 

no joy on the TWM vs EFI hardware, no experience here. they SHOULD be just about the same, its just a DCOE shaped hole with a throttle plate and TPS...

2 injectors should be fine, in fact there are a few people only running the two primary injectors in the Mazda rail, 1000cc seems to be about the sweet spot, but 700's might work depending on the power level. if you wanted to use smaller, then you'd need 2 more injectors, which is fine. the inexpensive way would be to run the 4 stock 460 injectors anyways.

the 6 port system does add low end power, but in such a light car you might not need it, its going to be fast enough. the exhaust matters too, if the exhaust isn't right it'll be really weak without the 6 ports.

 

I have seen some majorly POS throttle bodies. Australian? Or maybe Chinese knockoff resold by an Australian company. Either way, that experience is why I'd rather put a TPS on a carburetor.

 

If you went with a TPS on a carb, would you put injectors in the intake, or just use the ones in the housing?

 

My itb's are racinghead.au brand. No issues and the price is pretty damn decent. There were some design issues with bolt accessibility that I discovered. The newer models were re-designed to incorporate a channel for the bolts to fit into easier.

I'm also running 2 id1000 injectors in the stock primary fuel rail. I just tapped the rail for larger fittings to mate to -6an fuel lines

 

I did put a TPS on a carb, and I am using two injectors in the stock position.

I'd kinda sorta like to put injectors over the unit in a shower arrangement, but I'm kinda making too much power now, so it's good enough.