[Gmecm] TBI - TPI swap ??

[Steve Ravet]

Hi Ake, I wouldn't try to use the megasquirt and factory computer in parallel, that just sounds like a wiring mess.  Both computers are going to want to use lots of the same inputs, but you can't just take the MAP signal and send it to both computers.  Electrically it just doesn't work that way.

This sounds like your first project so you'll want to keep it as simple and close to stock as possible to increase your chance of success.  I think it makes sense to keep the TBI system.  That way most of your changes are just in the tuning, to compensate for the heads, cam, etc.

You'll have to get the part number for your computer off the box and then do some searching (or ask here) to find out if there is any tuning software for it.  A good place to start is tunercat.com.

Keep the TPI for later, if you decide to switch to it then what you've learned from tuning the fuel and ignition will carry over to tuning a TPI system also.  Others can comment on whether the TBI or TPI is more suitable for your truck.

--steve

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of ?ke Georgsson
> Sent: Monday, August 21, 2006 3:45 PM
> To: gmecm at diy-efi.org
> Subject: [Gmecm] TBI - TPI swap ??
> 
> hello my name is ?ke Georgsson and i live in sweden  . i?v 
> been a Subscriber of this list for a loong time now but  it?s 
> alittle bit owerkill for me  but im still reading it and get 
> some small  popups what it?s al about .. but far FAR away 
> from  say that im understund  lots of 
> what u guys are talking about :-)   well it seems in the 
> loong run  that 
> this is a  great list and finaly i?v got the use of it
> 
> i?v got a projekt that  has stoped at  a matter that il think 
> u guys can help me out on  so here it comes  :
>  
> I has got an Old  suburban  (1995  4 x 4 /  350  / Aut  )  and i have 
> rebuild an  ZZZ engine  with new pistons    , this zzz engine (first 
> edition)  has  smaller  combustionchabers then  stock  ( 58 
> cc )  so the compression is gonna be  little higher then 
> stock ( the aprox compression ratio 9.73:1 with a 64cc head 
> according to summit )  but my heads are as smaller  . that 
> wouldent be  bad cause  im planning to run 
> it on E85   and then i need a higher combustion  , well  
> headers  also 
> and a new comb from crane (compucam 2010 ) then to the thing 
> iv know  U can help me out  .. the injectionsystem ,,  i have 
> an  complette  >TPI 
> system  a take of from an  1989 Pontiac GTA   and i have a set of  
> bigger injectors ( accel 36 # ?) That i wanna use instead of 
> the stock 
> oem TBI system   i?v had planned to us an megasquirt system to manage 
> the fuelinjection  in run the  stock ECM  parallel  to get 
> the transmission work right  .. i been mailed around  on the 
> net and  get alot of  persons that says that this  ECM i have 
> in the 95 burb is been hacked down and are able even to run a 
> TPI system  ,, the  question is is this thru ? and if so  
> where do i find any instructions how i shall do  ?  and  the 
> things around that i need to map the chip that  i must 
> customise  to  make it al run ( even on  E85  thats need  
> moore fuel ) is it expensive and where do i find it ?
> 
>  be gentel please   im a good mecanic  and know electrics 
> quite good   
> but as i already  told this is alittle bit to owerrated for me NOW .. 
> but im quick learning and  are not afraid of testing new things  ..
> 
>  best regards   ?ke
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