Miata Mailing List: March 1997, Message #129
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   From: (none)

Subject: Question to Autorotor owners....

   Date: (none)



Like an idiot, I wrote...



> ecently I've played around with even higher off boost fuel pressures.  

> 

> I found a suprisingly high pressure of 60psi to feel very very nice.  No 

> 

> bogging and more low end/midrange torque with marginal decrease in fuel 

> 

> economy.  Needless to say, I'm not going back to the recommended 

> 

> pressures of 45-50psi.





BIG NEWS!!!  Well, for me, at least ;)  I solved the fuel pressure bogging 

problem which has been harrassing me for months. Turned out to be a clogged 

restrictor in the signal tube.  After cleaning it out I had to reduce my 

fuel pressure dramatically.  Base pressure went from 60 psi to what seems 

to 47-52 psi.  Before, I had to run very high base pressure to compensate 

for the clogged tube.  Bogging and other off/on boost oddities are 

completely solved!



It was so clogged, in fact, that my max pressure went from a clogged 110 

psi to a dangerous way-past-150psi when unclogged.  I had to turn the 

needle valve down 3 or 4 times to get the pressures low enough.  Back to a 

max 110psi and it feels great.  Avoiding car fires is a good thing 

(especially when your fire extinguisher is extinguished).



Like a dummy, I suspected/replaced everything (fuel pump/ injectors/ FPR/ 

etc,) while overlooking the obvious.  Oh well, I've learned my lesson.  

However, my one week old new FPR does seem to work smoother than the old 

one.  I think I'll keep it.



Well my turbo/sc friends, if you are experiencing any bogging problems, 

check for clogged restrictors before you overhaul your entire fuel system.  

It's a lot cheaper and less time consuming :)



Regards,



Shiv who is still looking forward to Bill's ECU.