[Diy_efi] Some problems with my FI conversion

[Torbjörn Forsman]

One possibility might be that the distributor is rotating in the wrong 
direction (the opposite direction against what the GM part was intended 
for). In that case, interchange the leads from the inductive pickup.

Furthermore, it might be a good idea to use a ignition module that is 
intended for a 4-cylinder engine.

I have bad experience of using anything other than the original types of 
ignition coils for the HEI ignition systems. Those ignition modules 
differ from all other ones in that they have no transient protection for 
the switch transistor, they rely on that the original ignition coil is 
designed so that it can never give voltage spikes above ca. 350 V across 
the primary even if the secondary is disconnected.

Some years ago, i converted an old Volvo (engine B20A, 4-cyl, 2.0 l) 
from carb to GM TBI, i used a TBI system from an Opel with 4-cyl 1.6 l 
engine. The distributor was assembled of part from several old Bosch 
distributors, in order to get an inductive pickup in a casing that fits 
the Volvo engine.

I have not changed the bin at all, just increased the fuel pressure to 
about 1.9 bars by using an adjustable pressure regulator in the return 
line, in order to adapt the system to the larger engine.

Best regards

Torbj?rn Forsman


Steve Ravet wrote:
>  
> 
> 
>>-----Original Message-----
>>From: diy_efi-bounces at diy-efi.org 
>>[mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Jens Jensen
>>Sent: Tuesday, July 18, 2006 1:44 PM
>>To: diy_efi at diy-efi.org
>>Subject: RE: [Diy_efi] Some problems with my FI conversion
>>
>>Well - I would not say that I had got the motor to 2000 RPM, 
>>but this does sound like what I saw.  The jump from 0 to 20 
>>is instant - as is the jump from 20 back to 0 when I close 
>>the throttle.  
>>
>>Chance this could happen at lower RPM than 2000?
> 
> 
> Maybe, if you have noise or pickup line the module might think the RPM
> is higher than it really is.
> 
> 
>>If my issue is because of the module's built in timing - and 
>>I am having the same problem with the bypass both plugged in 
>>and unplugged - What would that mean?
> 
> 
> It would mean the module is in bypass mode all the time.  Check the
> manual to see what voltage should be on the bypass line with the
> connector both connected and disconnected, and then check if that's what
> you have.
> 
> --steve
> 
> 
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