What is causing this camel hump (dyno)?
#1
What is causing this camel hump (dyno)?
anyone got any ideas on what is making this camel hump at upper rpms? (strange because green and red lines are within 60 seconds of each other, green taken first - but red and blue almost 2 months apart)
blue and green logs were taking within a minute of each other (literally 60 seconds, and the green one was taken first) - very strange.. any ideas?
NEW LOG
Seems to me like more of the same. very strange boost reading from evoscan. i might have a boost leak maybe; my boost peaks very slightly around 3800 at a little over 25, which i took to be normal of MBCs; and immediately after it starts tapering down until redline
blue and green logs were taking within a minute of each other (literally 60 seconds, and the green one was taken first) - very strange.. any ideas?
NEW LOG
Seems to me like more of the same. very strange boost reading from evoscan. i might have a boost leak maybe; my boost peaks very slightly around 3800 at a little over 25, which i took to be normal of MBCs; and immediately after it starts tapering down until redline
Last edited by kyoo; Oct 10, 2010 at 08:30 PM.
#4
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did u log boost, or knock? Could be u need to dial in the boost in that area, or maybe u knocked, and it pulled timing...
by the looks of it, u need to dial in the tune a lil better... Do u have corrections enabled? Looks like its trying to correct all over the place. post up a log...
Looks like u have one hell of a boost spike there buddy!
by the looks of it, u need to dial in the tune a lil better... Do u have corrections enabled? Looks like its trying to correct all over the place. post up a log...
Looks like u have one hell of a boost spike there buddy!
#5
did u log boost, or knock? Could be u need to dial in the boost in that area, or maybe u knocked, and it pulled timing...
by the looks of it, u need to dial in the tune a lil better... Do u have corrections enabled? Looks like its trying to correct all over the place. post up a log...
Looks like u have one hell of a boost spike there buddy!
by the looks of it, u need to dial in the tune a lil better... Do u have corrections enabled? Looks like its trying to correct all over the place. post up a log...
Looks like u have one hell of a boost spike there buddy!
i didnt log any knock though. afr remained pretty much 'normal'. i wasnt ever logged with a wideband though.. but even so the afrs arent bad. how can i tell if i pulled timing? i only have a mbc so i dont know if i can adjust boost like that.
#6
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yea it is peaking a little right before it settles, turned that down a bit. its weird that things change when its within 60 seconds apart from each other.
i didnt log any knock though. afr remained pretty much 'normal'. i wasnt ever logged with a wideband though.. but even so the afrs arent bad. how can i tell if i pulled timing? i only have a mbc so i dont know if i can adjust boost like that.
i didnt log any knock though. afr remained pretty much 'normal'. i wasnt ever logged with a wideband though.. but even so the afrs arent bad. how can i tell if i pulled timing? i only have a mbc so i dont know if i can adjust boost like that.
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#8
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Since they were 'back to back', I'm guessing you are started to heat your FMIC (heat soak) and timing was being pulled...Just post raw data logs and we'll be able to provide more valuable insight .
#9
clutch is brand new (within 6 months i'd say? an exedy twin) - i would agree about the roads thing but the red and blue lines were 2 months apart, on different roads.
how can i post both logs? i will be getting retuned soon, maybe i should just forget about this until after?
ps, thanks for all the help all
how can i post both logs? i will be getting retuned soon, maybe i should just forget about this until after?
ps, thanks for all the help all
Last edited by kyoo; Oct 10, 2010 at 08:39 AM.
#15
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My dyno graphs were looking the exact same way for a while and it turned out to be a couple of different things. One of the problems was that I did have a small boost leak, however my graphs were still looking like that even after I fixed it. The real problem ended up being the boost tables in my tune. I thought I had them dialed in but apparently they needed more fine tuning. Keep in mind that I'm using ECU controlled boost with a modified stock boost solenoid so I'm not sure how much those tables affect an MBC. I'm sort of a newb in that area cuz I've only been tuning my car for a few months now and ECU controlled boost is all I've ever had. So based on what little I know I'm thinking there could still be an issue in your tune that's causing the problem. Could also be your clutch like someone else suggested.