TPS and RPM only?

[sag at msys.net]

Mike,

	I'm in the process of installing a TBI EFI from an S-10 into my '84 Jeep.
Although this is a V6 and not a straight like yours I think you may want to
consider something.

	If you're going to do TBI instead of MPI then I would believe the key
point would be that the TBI could provide per the engine's displacement.
IF this is true, (my theory could be way out in left field on this) then
would ANY TBI that was designed for an engine displacement reasonably close
to the 225 slant 6 work????

	If it would work, then why not go to the junk yard and by a used TBI setup
- get everything; wiring harness, computer, TB, necessary sensors, etc???

	It would be cheaper and the cost per experimental factor would be lower.

	The reason why I'm suggesting this is that I've found the S-10 to Jeep
amazingly easy to work with SO FAR.  I've been able to easily pare down the
wiring harness to be stand alone, in addition, to planning on modifying the
injector output to compensate for the slightly increased engine size. (S-10
was 2.8L mine is a 3.4L)  I would think this could be done in other
similiar situations.

	Now, this is just a theory, so no flames necessary.  EFI technology is
something new for me and hypothisising is non-taxable.

Steve

p.s.  By the way, excellent engine choice.  I had one in a '68 Plymouth
Valiant.  You just can't kill it!


At 09:25 AM 3/25/97 +0100, you wrote:
>     I'm glad this came up. I'v been looking for a first step to adapt an 
>     older engine to EFI and TBI is something to consider although it's not 
>     discussed to often on this list...
>     
>     I've been doing some research on the Holley ProJection, mainly in the 
>     mail archives and at Holleys Website. Holley has a BBS which mainly 
>     seems to work as a department for complaints for more or less 
>     frustrated ProJection users. 
>     
>     I have a 225 slant 6 and thus the 501-2 kit for 258" Jeep is the 
>     obvious choice. This unit can (according to Holley) be adjusted (via 
>     control knobs?) for:       Idle
>                                Accelerator pump
>                                Mid.range
>                                Power
>                                Choke
>     
>     The fuel pump pressure can also be adjusted. As I understand, it uses 
>     only TPS and RPM sensors.
>     
>     Is this the same set-up you use? I'm asking because according to all 
>     the complaints on the mentioned BBS, there are a lot of users that are 
>     extremely unhappy with the system, being unable to adjust it properly 
>     and getting no help from Holley as it seems. I was even offered to buy 
>     a hardly used set-up from a furious user...
>     
>     Have you (or any one else on the list) had any problems to adjust this 
>     system? Can the problems likely be explained by the fact that there is 
>     no MAP sensor (i.e. "load sensor") on the ProJection.
>     
>     Any tips on this are interesting for me and highly appreciated.
>     
>     mike.olsson at eu.pnu.com