first off, my car is stock except free mods and 3in turbo back. everything(bcs, etc etc)

i am knocking and got a decent timing curve from TWDorris on the dsmlink forums, however, i am still knocking up high and would like some input. i thought i was running out of fuel and rewired the fuel pump, still knocking. DSMlink forums thought maf overrun and tried out the fake maf option, still knocking. here are three datalogs. the first two have my stock injectors, the last one has some 450's from a different car just in case my injectors were screwed somehow. i see my IDC's are high, but dont seem high enough to make me knock. either way, please give me some input. my timing cure is horrendous to stop the knock and i just dont see why. maybe someone else will have some good info or suggestions.

http://indystars.org/dsmlinklogs/run08182005-1.dat
http://indystars.org/dsmlinklogs/run08182005-2.dat
http://indystars.org/dsmlinklogs/run08192005-1.dat

Something is going on in your fuel system. I want to say its your fuel pump...are you using a Walboro 255? Your Front o2's indicate that you are running crazy lean for some reason...running out of fuel would seem to be the culprit. How old is the fuel pump in the car?

the fuel pump is a stocker with the rewired mod. it has about 57k on it.


you are a total genius. no one, including myself has noticed that the massive knock doesnt start until i hit .86v. it is the same in all three logs. guess i need a new fuel pump, too bad a dont have any money.

move along, nothing to see here.

Originally posted by Diceman19
the fuel pump is a stocker with the rewired mod. it has about 57k on it. you are a total genius. no one, including myself has noticed that the massive knock doesnt start until i hit .86v. it is the same in all three logs. guess i need a new fuel pump, too bad a dont have any money. move along, nothing to see here.

it would seem that way, either that or you have a issues else where in the fuel system. The Front's o2's definately indicate that.

on my local board, someone posted that due to the fact that i only have a 3 inch exhaust and 02 housing that there is no way it is my pump, that the pump is good for X PSI and i should be able to use it thus without upgrading. he is suggesting fuel filter. possible truth to this? im thinking if it was a clogged fuel filter, it would show in the logs ALL the time and not just when i hit high RPM. the voltages were worse before i rewired the fuel pump, as low as .82v in some places. thoughts? 02 sensor maybe? i have another one sitting here ready to install.

You should be able to use your stock pump, however that does not mean it cannot shit the bed on you. You are running lean in all your logs, a clogged fuel filter can also cause that. Go through and check your whole fuel system. Make sure there are no leaks and all the parts are in good working order. How old is your o2 Sensor?

I would start with either a stock or upgraded fuel pump and checking the system from the fuel filter on.

i have zero leaks whatsoever, the car only has 58k on it(body and engine). the 02 sensor has about....58k on it. ;-) i have a new 02 sensor in a box already waiting for install. with my car being a '90, the 02 sensor reads lower than 1gb cars. my a/fest is at like 9.5:1 so the dsmlink "thinks" i am running rich although i dont have a wideband to confirm this yet. my thought is that the fuel filter would cause me to knock ALL the time since a clog wouldnt change. the pump however will have more stress put on it the higher in rpm i go, thus running out of umph to give the fuel. i could be totally crazy though. i am buying a walbro 255 high pressure, an AFPR, and a new fuel filter and changing it all out shortly. hopefully that will fix whatever issue i am running into. any other thoughts on my thoughts?