Guess my new dyno results

[Chummel]

How much boost?

The shop didn't have a boost gauge, so I still have to go on what my boost gauge says. Around 12 psi at @7,300.

I am on a 5.00" pulley so I shouldn't be making that much boost.

Sponsored

 

[Chummel]

Pretty conservative timing for E70. Being safe at that power level and on the stock engine I get it.

Looking at this log you got knock very early in the pull. Knock on E85 especially on just conservative timing is usually caused by one thing. That is inconsistent lambda. at the start of the pull its very inconsistent which probably caused the knock. After that the knock sensors were happy, but the fuel was still pretty inconsistent. You see long drawn out fluctuations in lambda and short term fuel trims. My guess is the transport delay was increased too much. I would not be happy with this tune.

That is good to know, I can't read logs as well as I would like so I thought everything was good. That's what the tuner has been telling me at least. I have datalogged quite a few times doing wot pulls on e70, I think this is the only pull I have that shows positive knock.

Still though, I want my tune to be near perfect.

Can anyone else confirm that my log should look cleaner? Thanks

 

[whatsup62]

The shop didn't have a boost gauge, so I still have to go on what my boost gauge says. Around 12 psi at @7,300.

I am on a 5.00" pulley so I shouldn't be making that much boost.

1 hp different than me. Same set-up pretty much..Im at 10psi

 

[markmurfie]

That is good to know, I can't read logs as well as I would like so I thought everything was good. That's what the tuner has been telling me at least. I have datalogged quite a few times doing wot pulls on e70, I think this is the only pull I have that shows positive knock.

Still though, I want my tune to be near perfect.

Can anyone else confirm that my log should look cleaner? Thanks

Well heres your File you posted on datazap. It makes it easier to see the data.

http://www.datazap.me/u/markmurfe/log-1500454597?log=0&data=10-11-13-14-15-18&solo=4-10-11-14-15-18

I have your measures lambda and short term fuel trims selected. You can see at idle your mesured lambda is a wave with length of about 6 seconds. It should be going up and down a lot faster and not get so far away from lambda 1.

In the zoomed out view, during the pull, fuel looks good, but go to this link with it zoomed in on the pull and you see how much the measured lambda is moving around. .72 to .79 to .77 to .79 to .74 to .77 to .75..... bank two is a bit better but still moves around.

http://www.datazap.me/u/markmurfe/l...8&solo=4-10-11-14-15-18&zoom=2188-2612&mark=5

you may need to click on the lines to rescale.

 

[Tommy V]

ip

Well heres your File you posted on datazap. It makes it easier to see the data.

http://www.datazme/u/markmurfe/log-1500454597?log=0&data=10-11-13-14-15-18&solo=4-10-11-14-15-18

I have your measures lambda and short term fuel trims selected. You can see at idle your mesured lambda is a wave with length of about 6 seconds. It should be going up and down a lot faster and not get so far away from lambda 1.

In the zoomed out view, during the pull, fuel looks good, but go to this link with it zoomed in on the pull and you see how much the measured lambda is moving around. .72 to .79 to .77 to .79 to .74 to .77 to .75..... bank two is a bit better but still moves around.

http://www.datazap.me/u/markmurfe/l...8&solo=4-10-11-14-15-18&zoom=2188-2612&mark=5

you may need to click on the lines to rescale.

I think .72 to .79 is a bit of a difference,but the rest are pretty normal.I have not seen many wheir measured a/f were identical on both banks.

 

[Chummel]

How does this log look? I took this last night after having lund add in an extra degree of timing.

The car feels really good and pulls hard.

Sorry I don't know how to use the data zip thing.

 

[markmurfie]

ip

I think .72 to .79 is a bit of a difference,but the rest are pretty normal.I have not seen many wheir measured a/f were identical on both banks.

Im not talking about bank vs bank. This is the fluctuations in measured AFR on one bank. bank vs bank they are very close.

10.7* .72= an AFR of 7.7
10.7* .79= an AFR of 8.45

Thats moving around alot for ethanol. Because it needs to be so rich it makes it more sensative to fluctuations when it comes to knock.

 

[markmurfie]

How does this log look? I took this last night after having lund add in an extra degree of timing.

The car feels really good and pulls hard.

Sorry I don't know how to use the data zip thing.

That pull it didn't knock, but measured afr was still moving around a bit not as much as the first log. Your timing is conservative for E85 which give it a bit of saftey.

http://www.datazap.me/u/markmurfe/l...13-18&solo=4-10-11-14-15-16-18&zoom=1748-2115

I took a snip and marked it so you can see how much its moving. bank to bank they follow each other ok.

 

[markmurfie]

just want to be clear, this could be an exhaust leak as you did a exhaust modification. Your tuner may not be able to fix it. They should have pointed it out.

 

[Chummel]

just want to be clear, this could be an exhaust leak as you did a exhaust modification. Your tuner may not be able to fix it. They should have pointed it out.

Well... I don't like the sound of that..

How do I check for exhaust leak?

 

[Tommy V]

Im not talking about bank vs bank. This is the fluctuations in measured AFR on one bank. bank vs bank they are very close.

10.7* .72= an AFR of 7.7
10.7* .79= an AFR of 8.45

Thats moving around alot for ethanol. Because it needs to be so rich it makes it more sensative to fluctuations when it comes to knock.

Gotchs i couldnt see the log,yes thats a big difference for one bank,i had an issue similar to this wheir my car was not getting into fuel inrichment fast enough,bought it up to jon and he made some changes,i was not getting any knock though.

 

[markmurfie]

Well... I don't like the sound of that..

How do I check for exhaust leak?

Usually a spot of black soot can be seen. Check where headers meet heads and around O2 sensors.

Sponsored