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Simon
Current Cars:
-1966 Lotus Elan
-1986 German Car
-2006 Volkswagen Jetta TDI
Make R3V Great Again -2020 -
Yes, standard Dynojet whp. With Schrick cams and M50 intake it's configured to make power up to 7000 so if the rev limiter hadn't kicked in, who knows?...
As an aside, I tore down the old engine when the swap was all done. This was the engine that I essentially bought for scrap because it had overheated when it lost coolant. I had to Timecert the block and heat-straighten the head. It was in amazingly good shape. I expected to see upper ring damage or piston scuffing but none.Comment
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Any plots that you can share? I'm very curious about what the torque curve looks like. As you may remember, I am planning a dual Vanos converison on my 3.0 single Vanos build. I want more area under the curve to the left of the graph.Comment
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Here's the plot. I'll let everyone digest this and then post the old motor superimposed with this plot.
Keep in mind, intake cam static timing is off by 6 degrees (more retarded), VANOS seals are weak so the cams aren't tracking that great, ignition timing is probably Ok but not optimized. Fuel seems fine.
Of course, the 6000 rpm rev limit ghost in the software.
Still 232 at 6000 isn't a bad start...Attached FilesComment
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if anything, a bit of mechanical retard is helping your top end power - assuming it's the intake cam.Comment
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Giving up DISA and /or the new exhaust seems to have cost a lot of torque below 4000rpm?
Looking back at your earlier dynos this change definitely takes you over to the Dark Side! - Top end high revving power gained at the expense of torque below 4k rpm.
It would be interesting to see this dyno compared to a stock M50B25, not for absolute figures, but for how the power is delivered. I suspect you've gone a long way to achieving your objective of performance like the M50B25 with a rising crescendo as it comes on song over 4000rpm?Last edited by mike25; 09-30-2016, 02:59 AM.Comment
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Those headers/close collector are KILLING your low end power and you're probably gaining nothing up top for it.E92 MsportComment
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Compared to the original motor with ZHP cams and DISA intake....Attached FilesComment
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not 100% tuned yet, but them headers and collector......probably never going to provide as broad a power bandLast edited by digger; 10-09-2016, 02:32 PM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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I expected it to be down a little where DISA is most effective because, seriously, DISA kicks-ass where it's effective. The stock M54 is really great in that band. The stock M54 is a good motor, period.
That said, my tuning and configuration isn't as strong as it should be. I'll be going back to stock OBD2 headers primarily because they're more civil, but they'll probably be better than my current headers. That will help.
I'll re-time the cams and replace the VANOS seals, which have been very bad at maintaining cam position.
It'll be better.Comment
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As a scientific experiment it will be interesting to see what just the header change makes?
What do your stock OBD2 headers look like?
Here in UK we have two quite different versions - the simple early version, which is the same as our M52TU,
and had a Secondary Air Pump for emission control, then the later ones have CATs built into the header, which eliminated the SAP?
Last edited by mike25; 10-10-2016, 01:21 AM.Comment
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