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Old 06-26-2001, 12:08 AM   #1
Patrick Olsen
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Question Anyone know where I could find a DOHC 2.5L dyno graph?

I'm fiddling around with shift points that would (theoretically) be optimum on the track. Unfortunately, the only dyno graphs I have are from SOHC cars, which have a considerably different power curve, and a lower rev limit. Anyone have a DOHC dyno graph?

Thanks,
Pat Olsen
'97 Legacy 2.5GT sedan
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Old 06-26-2001, 09:24 AM   #2
2.5GT
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I asked this question a couple of weeks ago but to no avail. I'm also looking for a graph of the power curve for the phase I engines for optimal shift points as well. If you have any luck finding it on the web, let me know.

Thanks,

Jason
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Old 06-26-2001, 02:14 PM   #3
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Cool You mean like this:

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Old 06-26-2001, 03:05 PM   #4
8Complex

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Keep in mind the gear ratios when you go to figure it out. You could shift into peak torque on the next gear, but your multiplied torque at the previous gear may have been higher for quite a while still after shifting.
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Old 06-26-2001, 04:06 PM   #5
Patrick Olsen
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Thanks, dscottf, that's perfect!!

You are correct, 8, but you can actually figure this out without having to actually calculate torque to the wheels. Check out this thread http://www.corner-carvers.com/forum/...ML/000353.html , in particular the second post. In that post is a link to http://www.boostaholic.com/supra/shiftpoints.html , which is an example of how to work out the shift points the easy way.

Looks like I've got a project to fiddle around with this evening.

Pat
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Old 06-26-2001, 04:22 PM   #6
Ru fan
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Does that go for the 99' Legacy's with the DOHC, and the phase 2 block? My fathers car has one, boy would that make one cool engine build! Yummmmm....big N/A power!

Later,
Seth E.
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Old 08-22-2001, 11:49 PM   #7
m750
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pat, did you find the proper shift points, and how did you find them?
AO
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Old 08-24-2001, 08:14 PM   #8
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I would like to know aswell...

-justin
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Old 08-25-2001, 12:34 AM   #9
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Well, based on the graph that dscottf posted, for the DOHC motors the proper shift point is....drumroll please....redline! For every shift. I guess it's due to the narrower torque band (relative to the SOHC's torque band).

Pat Olsen
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Old 08-26-2001, 12:13 PM   #10
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As far as I knew the torque curve was about the same. And what is even stranger, why is the SOHC rated @ higher torque output?

-justin
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Old 08-26-2001, 10:28 PM   #11
Patrick Olsen
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It's rated at a higher torque output because....uh....it has a higher torque output. Not only does it have a higher torque output, but it has a broader torque band. I worked out shift points using the dyno graphs that Cobb Tuning had posted last year, and for the SOHC engine you only need to redline it for the 1-2 shift. After that each shift drops a bit more in RPM.

I'd be interested in seeing the SOHC and DOHC dyno graphs laid over each other to more clearly show the difference.

Pat
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Old 08-27-2001, 03:01 PM   #12
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This seems sooo odd to me...I always thought that DOHC engines were inherently better than their SOHC counterparts (ie: d16 series hondas vs b16 series engines).

-justin
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Old 08-27-2001, 06:00 PM   #13
m750
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thanks pat, I completly forgot to 1. check this post again, and 2 to ask you face to face.... Doh'
I'm not a huge drag fan, but I do want my car to be as fast as possbile.
AO
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