the y8s one-car dyno day.
#23
2 Props,3 Dildos,& 1 Cat
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ok ok.
http://y8spec.com/nemesis/maps/?C=M;O=A scroll down to the bottom where the date is 7/16 and check out the CSV files. Those are the datalogs from the before and after runs. The dyno data dump is in there too (xls) as well as the maps.
Rob, what do you mean I had another 10hp by 7k? I dont get what you mean...
The two graphs are same day both with the BEGi setup. I'll work on posting the graphs of the datalogs from before and after. they're very similar though.
M
http://y8spec.com/nemesis/maps/?C=M;O=A scroll down to the bottom where the date is 7/16 and check out the CSV files. Those are the datalogs from the before and after runs. The dyno data dump is in there too (xls) as well as the maps.
Rob, what do you mean I had another 10hp by 7k? I dont get what you mean...
The two graphs are same day both with the BEGi setup. I'll work on posting the graphs of the datalogs from before and after. they're very similar though.
M
#24
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Turbo is the standard Greddy/Mitsu 15g
#31
Very very nice.
Looking at 20070714_final002.csv:
1) Why the lean spot around 7150-7200rpm?
2) That's without knock? Wow. In your datalog your knock ramp goes up to 1.18. For my MSM I consider anything over 0.4V to be knock...I may be a bit conservative. I know the FM defaults are over 1V but I just assumed they were being aggressive or had a very noisy car. I went very fast down a hill while not in boost to determine my knock threshold. I also found I could squelch the knock spike after throttle let-off by making my high rpm vacuum load cells richer...which led me to believe I was getting rid of knock.
Looking at 20070714_final002.csv:
1) Why the lean spot around 7150-7200rpm?
2) That's without knock? Wow. In your datalog your knock ramp goes up to 1.18. For my MSM I consider anything over 0.4V to be knock...I may be a bit conservative. I know the FM defaults are over 1V but I just assumed they were being aggressive or had a very noisy car. I went very fast down a hill while not in boost to determine my knock threshold. I also found I could squelch the knock spike after throttle let-off by making my high rpm vacuum load cells richer...which led me to believe I was getting rid of knock.
Last edited by VanMSM; 07-16-2007 at 08:52 PM. Reason: Added attachment.
#32
2 Props,3 Dildos,& 1 Cat
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1) I believe that lean spot is rev limiter. note the spark there is ~14 degrees. Not sure why it's cutting fuel--i didn't think the hydra did that. It could be the backing off the throttle triggered the enleanment there.
2) I didn't think much of it. Everything is so noisy at 7 grand I can't be sure it's knock (or NOT knock?). I was always under the impression that true knock resembles an outlier in the sensor readings. like 2-3x the "noise" level.
Or my engine will die soon.
In any case, FM is not known to be anything but conservative with tuning. So who knows?
Where'd you get the .4V number?
2) I didn't think much of it. Everything is so noisy at 7 grand I can't be sure it's knock (or NOT knock?). I was always under the impression that true knock resembles an outlier in the sensor readings. like 2-3x the "noise" level.
Or my engine will die soon.
In any case, FM is not known to be anything but conservative with tuning. So who knows?
Where'd you get the .4V number?
#34
2 Props,3 Dildos,& 1 Cat
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right around 4200 is where I hit max boost. it depends on the gear of course.
compressor size has a lot to do with top end. boost pressure is a small part. imagine a 10 foot pipe with 2 psi vs. a garden hose with 2 psi flowing into a pool. which supplies more water?
Matt
compressor size has a lot to do with top end. boost pressure is a small part. imagine a 10 foot pipe with 2 psi vs. a garden hose with 2 psi flowing into a pool. which supplies more water?
Matt
#35
1) I believe that lean spot is rev limiter. note the spark there is ~14 degrees. Not sure why it's cutting fuel--i didn't think the hydra did that. It could be the backing off the throttle triggered the enleanment there.
2) I didn't think much of it. Everything is so noisy at 7 grand I can't be sure it's knock (or NOT knock?). I was always under the impression that true knock resembles an outlier in the sensor readings. like 2-3x the "noise" level.
Or my engine will die soon.
In any case, FM is not known to be anything but conservative with tuning. So who knows?
Where'd you get the .4V number?
2) I didn't think much of it. Everything is so noisy at 7 grand I can't be sure it's knock (or NOT knock?). I was always under the impression that true knock resembles an outlier in the sensor readings. like 2-3x the "noise" level.
Or my engine will die soon.
In any case, FM is not known to be anything but conservative with tuning. So who knows?
Where'd you get the .4V number?
Letting off the throttle should actually cause a rich event due to the slight lag in pulling fuel after the throttle closes...I think.
2) Now you've got me wondering. I don't have any experience with detecting knock so I guess I'm being overly careful. I believe some professional tuners actually use something like a stethoscope on the engine block to listen for sub-audible knock.
The 0.4V is just from watching my datalogs when I had things very rich. It also came from loggin while running very high rpms without being in boost. Though I probably don't get above 6500rpm that often...which is where yours really starts getting noisy.
Last edited by VanMSM; 07-17-2007 at 02:40 AM. Reason: typo
#37
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That's right, and getting back on the throttle causes a lean event (drop in pressure causes fuel vapor to momentarially change back to liquid form and vice versa). Hence fuel acceleration and fuel deceleration trim maps based on either delta TPS or delta MAP calculations (in the AEM EMS at least) If these aren't set right you may get knock when you snap your throttle open after a shift on the road even though you may never get knock on a dyno run.
#39
http://www.homemadeturbo.com/forum/i...?topic=78720.0
http://autospeed.drive.com.au/cms/article.html?&A=0353
I get the same rise in my knock curve as the rpm goes up. Then a large step up and have assumed it's all mechanical noise. When I see something that's a spike over 50%, then I examine the other parameters and determine if conditions suit knock.