Weird (?) Dyno Results, 4-banger, Can this be legit? |
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Weird (?) Dyno Results, 4-banger, Can this be legit? |
MikeInMunich |
Jan 1 2015, 07:48 AM
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#1
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Member Group: Members Posts: 392 Joined: 19-November 13 From: Munich, Germany Member No.: 16,674 Region Association: None |
Can a few of you veterans out there please offer feedback regarding this dynograph?
This is new to me, but I am skeptical here. (IMG:style_emoticons/default/confused24.gif) Thanks! Mike in Munich Attached thumbnail(s) |
a914622 |
Jan 18 2015, 01:51 AM
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#2
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Member Group: Members Posts: 316 Joined: 12-August 10 From: northwest Member No.: 12,048 Region Association: Pacific Northwest |
Are the injectors firing sequential or batch? If sequential I'm thinking 2 might be called out in the wrong order? With the sudden drop in power and still running rich could the engine be sucking puddled fuel? I helped a guy tune the maga squirt on a subaru that dropped power right at 5k , but the a/f was 16.5.
Jcl |
MikeInMunich |
Jan 18 2015, 02:41 AM
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#3
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Member Group: Members Posts: 392 Joined: 19-November 13 From: Munich, Germany Member No.: 16,674 Region Association: None |
Are the injectors firing sequential or batch? If sequential I'm thinking 2 might be called out in the wrong order? With the sudden drop in power and still running rich could the engine be sucking puddled fuel? I helped a guy tune the maga squirt on a subaru that dropped power right at 5k , but the a/f was 16.5. Jcl As may be pretty clear to most, I'm no a car-tech guy nor the one working on this vehicle. I'm learning a lot as I go, but this suggestion sounds pretty odd to me. Without learning more about the possibility suggested here, I'll be bold to just say that I would certainly presume the injectors fire sequentially. (IMG:style_emoticons/default/idea.gif) 16.5 is very lean. I guess that was your point? It's a shame that while the car was going to the dyno shop I wasn't aware that the timing was only advanced 5 degrees when it should be around 27. (IMG:style_emoticons/default/headbang.gif) This, based on what I've been reading, is the most likely cause for loss of power in the higher RPM range, (along with the limitations of the relatively small valves and cam). This, IMO, should have definitely been the first thought and suggestion of the guys at the dyno shop. I've learned a lot since I began this thread and I hope it's not just been educational for myself but many others as well, and will remain so for many in the future. (IMG:style_emoticons/default/beerchug.gif) Next thing to look into and learn more about for me is this notion of the FI firing non-sequentially. (IMG:style_emoticons/default/confused24.gif) M.i.M. |
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