Which ECM? Obviously this never happened in production, but there should be an ECM capable of handling this combination.. obviously a new MAP sensor (depending on amount of boost of course) is required.

Does anyone have any suggestions?

Would running a '7747 with a 2 bar (under 15PSI boost) be a bad thing?

Ken

 

I was wondering that same thing. It's GOTTA work, but gonna have to PROM change something wicked.

EDIT: ie, to bolt on a cheapo new blower, run less than 10lbs boost and use a 670cfm/454 OEM TBI unit. Good emmissions AND power AND cheap AND easy(?) AND plenty(?) of parts available.

Anyone else???

[This message has been edited by FastBroker (edited March 27, 2001).]

 

Personally I was thinking more along the lines of twin turbo on my '73 Corvette.. but I was also thinking of the guy in TBI that was asking about the B&M (Holley) supercharger as well.

Ken

 

Cool.

 

It seems to me this would be an easier route to take, because the OEM ECM's designed to handle boost are not plug and play with TBI.

With a roots blower the ECM would never read any boost since it is a draw through setup and the MAP is connected between the blower and TBI. I would bet you could use a 7747 to fuel a roots s-charged engine fairly easily.

[This message has been edited by Brent (edited March 27, 2001).]

 

The trouble is that you run out of resolution for tuning when in boost, so you have to setr everything too rich early so you don't run out at the top end.

For oem 2 bar (boosted) systems you have the syclone/tyfons, Turbo Gran prix (91 ish), Turbo Buicks, and the late S/C pontiacs. Notice none of them at TBI. The superchargers can add alot of turbulence, and generate rich lean cylinders. I'd seriously look at doing something TPI wise

 

Any suggestions on an ECM for a V8 with forced induction then? The list you show are all V6's, aren't they?

Ken

 

Grumpy if the map was sourced between the tbi and the blower it would never see boost it would just think the engine is soooo much more efficient / larger cubes.
Would this not work without loosing resolution as the boost the actual engine sees is dependant on the throttle blade position (or vacuum below thottle blades)

 

I think maybe this might be in order for the combination (TBI + forced induction)

Holley Commander 950

Anybody have any experience with these?

Ken

 

Keep in mind that the larger of the TBI injectors (on a 2bbl setup) will only support a max of 400 - 450 hp.

 

One of my friends has single turbo on his tbi truck, and I'm not sure of the particulars but I know it's a stock tbi with the stock ecm and prom and it runs like crazy, for an otherwise stock pickup truck.