mazymus

graphs are now up, the bmp files were too big, so had to use png.

tylerxfire

iTrader: (15)

the graphs look better except for the power falling off at about 5700 rpm hard to tell what the actual a/f is but seems 11's then 10's..was it tuned from a bung pre cat?

did u get your cog belt fixed up..squeak stop?

mazymus

no, was tuned from the exhaust.
i have to re-eval the wideband numbers at various rpms. im not sure why the pre-cat numbers are higher (and not lower) than the exhaust. i thought the exhaust usually runs leaner.

i'll just video tape it and look at it later, don't want to stare at the wideband and drive.

tylerxfire

iTrader: (15)

do u have cats on the car?

it should be tuned pre cat as most do but if it is tuned at the tailpipe then the tailpipe number is gonna be about a point higher or little more id say than a pre cat reading and the tuner should know this and tune for it..

A pre cat number should be lower than tailpipe reading because the exhaust gases are filtered then read at the tailpipe which will make a leaner reading vs being read before being filtered in the cat and getting a pre cat reading..

example 11.7-11.8 range is what you would want pre cat reading and at the tailpipe would be about a point or so higher

also with the vortech it can start out a little leaner unlike a turbo setup, say start out into the 12's wot as it isnt making its full boost on the hit prolly about 4-5 psi and will be building boost and gradually richening up as it builds more boost and rpm's and steady off into the 11's (again pre cat a/f numbers)..this will give more power down low

tylerxfire

iTrader: (15)

oldmanz is a good one to discuss ur graphs..better than me..and im sure tim will chime in and tell about it and clear things up

mazymus

We talked about it briefly over the phone, and he mentioned that the numbers maybe a bit off due to heat. It was noisy in the car, so I couldn't hear all that was said.

I'll check out my numbers again tomorrow, I maybe off about them (I may have been looking at numbers at little or no boost at low RPM's), so I'll confirm w/ the video. From what I remember, the higher RPM AFRS were all spot on. Which is probably were it counts the most anyways??

TurboTim

iTrader: (11)

Oh and those were two back to back runs with no changes to the tune.Notice the difference in the AFRs? LOL

tylerxfire

iTrader: (15)

so was the car tuned from a reading at the tailpipe? He has cats on the car so that is going to lean out the reading quite a bit at the tailpipe correct?...The dyno sheet says it is in the 11's correct? so that would mean the car is actually really rich and would be in the 10's or 9's on a pre cat a/f reading where it should be in the 11's taking into consideration if this graph shows a reading from the tailpipe like i think maz is saying..Am i not looking at this right or is it tuned from a pre cat reading on this graph?

going by maz saying you tuned it from the tailpipe and not a pre cat reading

do u have a graph like oldmanz posted up that lists the actual a/f numbers in cells?