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Bellengineering - Miata Accessories Ordering and General Information Stephanie Turner 830-438-2890 ext. 103 [email protected]

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Old 06-06-2009, 05:10 PM   #1
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Default Finally some good results (1.6L IM)

Finally got brad on the dyno to see what his 1.6L BEGi IM did.

It lost a little on the low-end during spool, but everything above 5.5K was an improvement. You can see the boost plots for each pull so you can see even with slightly less boost it's making a bunch more top-end.

Its running around 20-24* spark angle at 17psi which slowly drops to 16psi at redline, no matter what we couldn't cure this, he needs a new wastegate actuator.

His final numbers were 261rwhp and 221rwtq @ 16.1psi, not bad for a 1.6L with just a built block.

Setup = 2871, log manifold, 3" turbo back exhaust, BEGi IM, 70mm TB, .020" overbore, 8.8:1 CR pistons.




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Old 06-06-2009, 05:14 PM   #2
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Sweet! Is this roughly the same as your setup?
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Old 06-06-2009, 05:22 PM   #3
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Sweet! Is this roughly the same as your setup?
Mine has a larger plenum, slightly shorter runners (without the step change) and stock TB. I was hoping to run today as well and redo it, but I didn't receive a part I was waiting for.

This is the one on Brad's car:

It's 100% fabricated, unlike mine.
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Old 06-06-2009, 07:11 PM   #4
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For starting at less than 250whp, that is pretty good. What do you think the torque loss was due to?
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Old 06-06-2009, 07:29 PM   #5
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That is freakin awesome. Steph, I need one!
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Old 06-06-2009, 07:32 PM   #6
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For starting at less than 250whp, that is pretty good. What do you think the torque loss was due to?
Stephanie
That's the before/after of the IM/TB combo. You can see it held torque a lot better than before, it only lost 20 tq from peak, compared to 60 tq from before. With a little more timing and if his wastegate could maintain the boost past 6300RPM, I'm sure he could hit closer to 280.

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Old 06-06-2009, 07:44 PM   #7
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here's the log file:
Attached Files
File Type: xls moore - run 13 boost.xls (112.2 KB, 128 views)
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Old 06-06-2009, 09:41 PM   #8
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The boost pressure is forcing the flapper open just after 5500rpm. Get an adjustable wastegate and tighten it to like 13+ psi and it will hold all day long. Then he can finally push it up to like 20psi or whatever the max will be on pump.
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Old 06-06-2009, 10:44 PM   #9
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I'm using a begi 15 psi actuator, with my hallman it holds at 16 psi all the way to red line. Did the same when I tried 19.
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