so would I.... I'm still going with my lack of EGR idea as thats the only thing that currently makes sense....
Mark, I have the same headers as you (TTZed) in my NA and have no problems with detonation. I think Russ (ZedHed) also has the same set-up, and to my knowledge, no detonation problems. The major difference between your engine and ours is the more aggressive cams and headwork you have had done. Is this possibly the cause of your problems? You can't return the heads to stock configuration, but have you tried refitting stock cams (I know it is a bastard of a job, but it may be the solution)?
i don't think its your EGR at all , in any case .. IMO what could have happened is , when they did your timing belt , just one of your cams may be out ,,( on the teeth) and that could cause this problem , and you would not know it , it would just have a small ping on take off acceleration and should go away when you are on cruise but you hit the accelerator again and its back just for a bit the goes again .. mark i don't know if you did the timing belt on that one ,, but i think you should have a proper (PROPER) look at all the teeth at the rite angle ,, i hilly doubt the its the crank setting ,, i more believe its on the cam side .. knowing you, i believe you would have gone over the car like crazy.. just something to look at ... just one more this could you chock be stuck on ???????????... just my 2 cen cheers alex
timing... i'm a bit of a newb with the timing belt as its the one thing I have not yet done myself on the zed.... but if the cam was out by one tooth, wouldnt the whole belt be out by one tooth?? and wouldnt this show up when you check the ignition timing? Also, I thought CAM timing was only adjustable on cars that have adjustable CAM gears. My zed does not. Like I said, total newb, so please explain... If it is a timing belt issue, I'd have to be damned unlucky. Because in the 4 years of pinging drama's, the timing belt has been off 3 times for other reasons. I find it hard to beleive that my mechanic would have installed it incorrectly 3 times in a row.... Cheers
You have worked cams with more lift and duration? Thats ur prob right there...... retard ur timing till the det stops. if retarding the timing has a big affect on ur total power output, then i suspect ur cams HAVE not been dialed in properly Regards, Trev
dougy... I know dougy, thats what annoys me. I know your car and Russ's car dont ping and yet tektrader (when he had his NA) and BigCol have reported pinging in the same area as mine, along with two other NA owners who have sent me PM's asking me if I had a solution........ its really inconsistent in regards to mods..... damn that little man and his hammer... Do a simple test for me dougy, as the pinging is quite hard to hear from within the cabin and may go unnoticed. On a hot day (say 30+), turn the aircon on and drive around for about 30 minutes. Then find a nice road with a wall or some sort of concrete barrier that is very close to the car when driving (i find road works are great for this as they set up those massive concrete barriers right on the edge of the driving lane). While driving next to the wall (turn off stereo and lower window so you can hear engine noise), get the rpm at about 2500rpm and then very lightly accelerate (just touch the pedal) up to about 3200rpm..... if you hear the lovely engine rattle of pinging, then the little man and his hammer has taken up residence in your engine.... For me, this simple test works a treat. The other thing, I dont know if there is a difference in gearing and engine load between the auto and manuals.... for my car (manual), I have to be in third or fourth gear to ping at those rpms... so in third, I'd be doing around 60km / hr and in fourth, it'd be around 80km / hr.. Cheers
u guys do realize if u have aftermarket hotter cams then u can't run the standard amount of timing advance? get the thing on a dyno before u stuff the motor and have the guy tune the thing.......... not only should the base ignition timing be changed but also the curve
cams dougy (red32) was slightly wrong in regards to the mods done to my heads... I am running stock CAMS. Cheers
well maybe he didn't notice it , now that i no its got stock cams I'm more inclined to suggest , that , that's what the problem is ,, it is possible......... i think ( not sure ) but if you change you timing up or down ( depending on witch cam it is ) and if there is not much difference then its a good chance , that's what it is .....
dont know if you know of this forum, dont remember if i ever saw you in there. but if not, try posting about your problem here: http://www.efi101.com/forum/ in the "tuning tips" section. if anyone should be able to wrap their head around this problem of yours it should be them...
just the one tooth needs to be out on one cam ( put on incorrectly ) some mechanics mark the timing belt with a white texter , so if he took it of and mark it like that ,,, well my guess is he put it back the same way .... this may be the reason its been doing it for such a long time ,, it always been put back the same way and not checked against the original markings on the engine. somehting to think about .....
ok.... its possible I guess.. Cant hurt to check, just a pain in the arse to get the timing belt covers off.... so if I count the number of teeth between the markings on the cam sprockets, will that tell me if its out by a tooth? Cheers
no no no ... there is a marking( at about the 4 o'clock position on the oil pump) and there are markning on the black plate that holds the cam gear covers on, ( you will see them ) .......... about 11 12 o'clock
I thought... that the markings on the oil pump and the markings on the rear of the timing belt covers was only a guide..... i could be wrong, but I thought it was the markings on the cam gears and crank sprocket that are important, and thats what you should use as a reference when counting teeth.... Cheers
the markings on the gears and the markings on the black plate should line up .. there not 100% but they are about 98% rite ... no not a estimate , that's were they go ...
Sorry, Mark! I knew you had head work done but I also thought that you had A/M cams (that's my next move!)! As for your "test", no way, until I get an aftermarket temperature gauge fitted (should be the end of this month). Last time I used the aircon (November, last year, on the way home from Adelaide after Berri) the temp went sky-high (103 degrees, according to Jacks PDA software). But I will try this AFTER i have an accurate temperature gauge fitted! The other point you make is that I (not sure about Russ) have an auto... there is a certain amount of "slippage" so the engine may rev higher at a certain speed than a manual, thereby bypassing the low rev/load situation you are experiencing.
Russ has a manual from memory. I did get a small amount of pinging with really light throttle use on a hot day. Not sure lately since having my 100k service done properly. My solution has been to a) ignore it, or b) put my foot down a little harder. Given my zed is stock, with no engine or ECU modification work I believe that Nissan made a best balance decision of not retarding the timing (thus robbing high end power) versus a small window where pinging could occur under light throttle. Hell it could just be that Mark & I have really light feet and are actively listening for pinging.
Accelleration increase fuel 0x7200? Hi Jedi, I am by no means an expert and so am just asking this out of interest, but have you tried adjusting the "Acceleration increase fuel" values at 0x7200 (16 bytes) I only know about these values because I am playing around with NIStune and was wondering if tweaking these would help your acceleration pinging problem.
not sure... I'm not sure what those values are or what to change them to. I was hoping the zed ecu had a throttle enrichment table, but so far, the only information I have found on it is that people know it exists, but no one really knows how to edit it. Do you have any more info on the data at 0x7200? Cheers
some more info.... The software I use to do most of the editing is TunerPro. One of the variables you can change is something called "fuel increase rate initial value".... The address for this variable is at 79FF, and the value that you change in TunerPro is a percentage. Currently, its set at 99.61%. I'd love to know what changing this value would do..... but cant find any info on it... Cheers
