TPI on a 6cyl

[peter paul fenske]

Hi Thomas

Well you got a few choices..

If using GM you could use the Sy calibration and a #730
ECM. You might have to tweak the VE tables a bit..

Other wise use the #730 ECM with Map for a 3.1 V6.
bumping the fuel pressure a bit will move the cal up
and CL should enable low rpm operation.. However
the HP is a bit limited..

The Chev V6 also used a frequency based MAF.
Not a good system since the factory upgrade was to MAP
rather than replace the broken MAF. OFten....

The only thing I would worry about is obtaining a distributer
signal for the ECM.

I also though the fuel injection was on the jag 6

Should be able to get that running with the ecm..

GL:peter
>made, and will make to the car.  The L jet system is very restrictive
>,and from what I have read, stops increasing the supply of fuel after
>4000 RPM.  The modifications to my engine so far are:  a freer flowing
>exhaust, gas flowed head, hotter cams and a TH700R4 tranny.
>After following this list for a while, I have decided that making my own
>fuel injection system from scratch is way over my head, and an
>aftermarket system is way over my budget.  Therefore, I would like to
>try and adapt the system from another care to mine.
>I was thinking about a TPI system with an Mass Air Flow meter.  Although
>an MAF may be somewhat restrictive, it's got to be better than the air
>flow meter on my L-Jet, and it would eliminate some of the tuning
>problems I would have trying to adapt a MAP based system.
>I have about a thousand and one questions, but I will limit them to just
>a few, since I have rattled on long enough already.
>Am I right in assuming that if I match a MAF to the right sized
>injectors, then all else aside, It would eliminate most tuning problems
>(from an A/F stand point)?
>It is my understanding that MAF systems are calibrated to a certain max
>HP.  Therefore I would need a system from a 350 V8.  (I estimate my HP
>potential right now to be about 225HP, and more in the future.)  But I
>have a 6cyl.  I figure the 6cyl ignition signal being sent to an ECM
>that thinks it is getting a signal from an 8cyl would throw the
>injection timing off.  Is there a way around this?  (I am not looking to
>control the ignition timing.)  Is there a common MAF system (i.e. not
>Buick GN) for a 6cyl that can handle 200 - 300 HP range?  Late eighties
>Chevy IROCs are easy to come by for salvaging parts, therefore I would
>prefer to adapt one of these V8 systems.
>I have many more specific questions, but I'll just leave it to these
>basic ones, first.
>Thanks
>Tom Wright
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