[Supras] Lexus AFM + 550cc injector head scratcher

[jjcorbat at uwm.edu]

I'm pretty certain that we've discussed this topic previously but I'll weigh in
nonetheless.

I have been using the Lex/550/AFPR setup with no additional electronics for
maybe 4~5 years to 15psi without any negative affects.  I am certainly not drag
racing or the like but the car operates wonderfully and passes WI dyno emission
testing.  I only monitor with a dual probe EGT setup & boost gauge mounted in
the cockpit.  I suppose it would be better to use a wideband but I've not found
the need to do so.

Regards,
Jeff
www.afprkit.com

Quoting berniek at technicaldevelop.com:

> Hi list.
>
>     The original Reg information about the AFM-injector modification painted
> a pretty simple picture.  Some list members I've exchanged information with
> have done the mod without additional electronics by setting the AFM bypass
> screw and pressure of a replacement FPR.
>
>     However, in reading some old tech postings, the point was made that the
> ECU calculates spark retard values under boost by reading the Karman vortex
> frequency.  Since it will be about 20% less for a given air flow with the
> Lex-550cc modification, the ECU will not retard the spark as much as with the
> standard setup.
>
>     Of course, the knock sensors will cause the spark to retard, but should
> not be relied upon in the normal course of operation.  I'm curious if anyone
> has considered this point or has had any problems in running the Lex mod
> without electronic add-ons.
>
>     Thanks.
>
>         BernieK
> _______________________________________________
> Supras mailing list
> Supras at supras.com
> http://supras.com/mailman/listinfo/supras_supras.com
>