Mods are in my sig, anyway, got some free dyno time today and wanted to see what it put down before I go turbo, and they said my car was pulling timing up top, and the power curve was really jagged looking. Anyway, could this be my fuel filter or fuel pump not supplying enougn gas?? My car has 85k, probably stock filter and pump. I already got a filter to replace the stock one, but I am wondering if there are any other parts I should look at.

Thanks

 

you should change the pump cuz you gonna have to anyways and check the stock fuel pressure regulator.

 

its supposed to pull timing up top. im guessing he meant too much. check your base timing. why would you assume its a fuel issue.

and by the way, an upgraded fuel pump isnt required for most D series boost builds.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">its supposed to pull timing up top. im guessing he meant too much. check your base timing. why would you assume its a fuel issue. </TD></TR></TABLE>

The dyno curve was super jagged, even after they smoothed it out, and it really flattened out up top compared to most honda dyno graphs I have seen.

I would assume it is a fuel issure because the timing has never been messed around with, and its got relatively fresh plugs and wires, compared to the fuel filter which has 85k on it.

Anyway, I replaced the filter and it feels a lot smoother during acceleration, not necessarily any faster, but it could be up a couple HP, but nothing really noticable on the butt dyno.

 

well, was this a sniffer run, or just base HP. do an o2 pull and see if its leaning out. a flat curve could be a number of things, check valve adjustment, ignition timing, etc. as for the spikes in the curve thats most likely gonna be ignition related, a stock honda isnt going need much fuel adjustments.