data log.

[mazdaspeed32007]

i ran a few of them but was still trying out how to figure this ap out. heres 1 and i cant seem to find out why my boost sucks so much dick.




it was something like....40 degrees out and i couldnt get any run to hold boost above that 15.5 mark. i checked all my clamps and such and cant find anything wrong. this was i believe a 4th gear pull. should be full boost. idk.

also what would be considered an unsafe knock. i get a spike upon normal driving once in a while and i did a run from launch-5th gear and had a knock of 5.6. i know some people run near 8 sometimes and im quite sure 5.6 is nothing to worry about esp since it doesnt happen all them time but just wanted to ask. still getting used to learning the ecu s***. thanks.

 

[mazdaspeed32007]

i couldnt run the stage 2 sf 93 map because i hit fuel cut so imrunning the stock map on cobbs site. i have cobb dp. 3" custom tbe 1 cat and muffler. sri. plugs. motor mount.

 

[coyfish]

Have you tried flashing to stock and checking your boost?

 

[dread]

There is nothing wrong with your boost. That is how much you get on the stock map. Why would you expect more if your not running a cobb tune? Get a fuel pump and run the cobb map. Part throttle knock is normal and nothing to worry about. If you get above 2.0 at WOT then its a problem.

 

[mazdaspeed32007]

alright. yea i figured i would be getting something like 16 psi through WOT until the drop off at around 5800. waiting to buy the pump so i can get her purring like a kitten.

as far as the knock is concerned would i expect to see knock consistantly on each run? would now and again be considered acceptable? i know knock is a noise the rods and pistons make upon the fuel ignition at the wrong time. like a preignition before top dead center right? its the resonance of the parts. i know that if its bad it could blow a piston or rod through the block or head yada yada. thats why your timing advances itself to make sure the combustion of the gas is at the perfect point temperature and pressure. i think thats correct. so wouldnt that be consistant if we say the fuel i use is consistant? or does it do it sometimes and not on others? i just dont want to have massive wear and tear on the motor due to knock i miss in my data logs because i recorded them at the "wrong time". i ran a WOT run today without doing a log and i saw my knock was a 5.6 max at one point. i dont know when it happened but thats what the ap said. like i said before...its not terrible if it just sorta happened freakishly but i would only worry about a consistant knock right? or does engine knock not work like that?

sorry to be the student. i really want to get a grasp on all of this so i know what im looking for. i know a lot about cars....and little about the technical s***. im trying to read up on all of this in the process. sometimes reading it isnt like someone telling you.

 

[dread]

part throttle knock retard is caused by the ecu trying to maximize fuel mileage by pulling timing. The 5.6 knock you saw likely occurred when you let off the gas. Spikes are usually false readings. If you were getting consistent knock it would spike and add timing back slowly.

 

[mazdaspeed32007]

ok thats what i thought. i just saw 5.6 and was like eeeek. lol. i wish you could hook up the lap top the the ap when logging and it would run the values and graphs then and there. something to think about cobb? lol.

 

[mazdaspeed32007]

ok so i ran some more data logs this morning on the way to work. 3-4 3rd ger pulls, a 4th gear pull, and cruizing at 75 under light load up small hills. i gotta say....im not a fan of the knock that comes with small hills on several occasions. i was hitting 6.7 and it was bouncing around from 1-6.7 for more than a few seconds about 4-5 times in a 35 mile hike. ill post some of the logs when i get home from work. im not going to say it was the fuel because i shop the same fuel from the same place in a heavy traffic area. 93 shell v power. keep in touch and let me know what you think around 5pm.

 

[coyfish]

Do people running standbacks experience these same knock issues?

 

[RC08MS3]

ok so i ran some more data logs this morning on the way to work. 3-4 3rd ger pulls, a 4th gear pull, and cruizing at 75 under light load up small hills. i gotta say....im not a fan of the knock that comes with small hills on several occasions. i was hitting 6.7 and it was bouncing around from 1-6.7 for more than a few seconds about 4-5 times in a 35 mile hike. ill post some of the logs when i get home from work. im not going to say it was the fuel because i shop the same fuel from the same place in a heavy traffic area. 93 shell v power. keep in touch and let me know what you think around 5pm.

wow im not getting knock like that with my tune, i got occasional but only for about a second, kinda like a spike and then its gone.

 

[dread]

on hills I will get sustained knock retard up to 5.9. If you are running the stock map it has nothing to do with the ap.

 

[mazdaspeed32007]

on hills I will get sustained knock retard up to 5.9. If you are running the stock map it has nothing to do with the ap.

so with the tune that should be corrected for the most part correct?
and does this happen if you bough tthe car off the lot? thats something mazda probably should have looked into am i wrong? im pretty sure a knock of 5-6-7 over 100,000 miles is fatigue galore on pistons n' rods.

 

[mazdaspeed32007]

part throttle knock retard is caused by the ecu trying to maximize fuel mileage by pulling timing. The 5.6 knock you saw likely occurred when you let off the gas. Spikes are usually false readings. If you were getting consistent knock it would spike and add timing back slowly.

commenting on your earlier post that would explain why i got a spike of the 6.7 kncok and it returned over the course of about 3-4 seconds. slowly making sense to me. im going to keep picking your brain dread. your a mountain of knowledge for me. lol.

 

[dread]

Knock retard does not necessarily mean that you are getting detonation. Christian has told me several times that KR at part throttle is normal and nothing to worry about. The ecu pulls timing to conserve fuel while cruising and that is what you are seeing. KR at wot is bad on the other hand. you don't want anything over 2.0

 

[mazdaspeed32007]

I ran some logs today...

3rd gear run

2 gear pull (3rd-4th)

bad cruise knock

 

[PCspeed3]

how did you look at them in graph form?

I click mine on the desktop and its just a bunch of numbers.....

 

[RC08MS3]

i think he made them himself, they are in an excel format so its not to hard to make a graph from the data

 

[mazdaspeed32007]

http://www.mazda----speed--- forums.org/forum/cobb-access-port/16628-how-make-graphs-excel.html

just take out the extra sh*t. dread gave me the link to his how-to. i kinda figured it out myself but his tutorial gave me the knowledge to finish it up.