NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)
-   2nd Generation Specific (https://www.nopistons.com/2nd-generation-specific-17/)
-   -   Low Rpm Ping... (https://www.nopistons.com/2nd-generation-specific-17/low-rpm-ping-27250/)

J-Rat 10-21-2003 08:14 PM
Originally Posted by Apex13B' date='Oct 21 2003, 04:53 PM
I honestly think that its a secondary lazy injector. Its knocking at the transition point
Had the same problem when I was running 550/550s. I swapped to the 720s (secondaries) and the problem remained. I think that rules out the lazy secondary.



Jarrett

J-Rat 10-21-2003 08:16 PM
Originally Posted by vosko' date='Oct 21 2003, 04:57 PM
i do have an idea..... maybe your staging is off your running out of primaries ????



sandors car did that and was going lean he was using 550/1000's



i think he went to 800/1000 and it fixed the problem
I considered this too... Possible that the PSI range in the primary area (before 3800) is too high for the pressure (10 PSI).



I am currently looking for an acceptible replacement. Possibly the greddy 720s. Anyone have experience with them?



Jarrett

Apex13B 10-21-2003 08:26 PM
now i'm guessing





FCD faulty?

J-Rat 10-21-2003 09:13 PM
Well, for one ping only? I dont think so. Although I can re-adjust it if you think that could be a culprit. I am kinda grabbing at straws right now.



I was always under the assumption that the primaries could supply enough fuel for 10 PSI, but from what Vosko is saying, maybe not. I wish I could get to a dyno, but even if I replicate the problem on the dyno, I am still risking the possibility of another ping. And that one might be my last.... https://www.nopistons.com/forums/pub..._DIR#>/sad.png





Thanks all for your advice so far! I appreciate you taking the time to help me with this!



Jarrett

turborotor 10-22-2003 03:42 AM
OK this is complete random. I don't see on your sig what kind of clutch you are running.



THis may sound weird but I had a problem like you in which i would hear a ping. I thought i was going to break the engine.



Now, are you running that crappy centerforce piece of crap as a clutch???



LOL



This was my case for the ping that wasn't engine related but it sound like it was from the engine. As soon as I upgraded the clutch, the problem was gone.



C

J-Rat 10-22-2003 04:11 AM
The clutch is the ACT street/strip.



As of right now, I am going to replace the primaries with larger injectors. I dont necessarily think that fuel is a problem so much as I think I have a bad/lazy primary. Whatever I come up with, I will post.



Again, thanks all for taking the time to help me through this.



Jarret

turborotor 10-22-2003 04:39 AM
Ok there goes that hunch

BigTurbo74 10-22-2003 12:45 PM
haha

j9fd3s 10-22-2003 01:09 PM
Originally Posted by J-Rat' date='Oct 21 2003, 06:13 PM
I was always under the assumption that the primaries could supply enough fuel for 10 PSI, but from what Vosko is saying, maybe not. I wish I could get to a dyno, but even if I replicate the problem on the dyno, I am still risking the possibility of another ping. And that one might be my last.... https://www.nopistons.com/forums/pub..._DIR#>/sad.png







Jarrett
up to what rpm? maybe you should run 720/550 instead of 550/720



mike

FrestyleFC3S 10-22-2003 01:15 PM
not that this is the cure or anything...but if your gonna upgrade your fuel system a lot like that....its not the best idea to run them off of the stock ecu with a controller.....



upgrade to a standalone, ditch the fuel controllers, and the fcd....and theres 2 things outta the way?


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