robk
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RE: robk's MR2 Turbo
2013/12/10 23:01:49
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I was back at MRC today and we resolved the high-rpm issue.  MRC can now finalise the tune, now that they can hit the redline every time. Once that's done (maybe even tomorrow if I'm lucky), then I'll finally get my car back!
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just_ace
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RE: robk's MR2 Turbo
2013/12/10 23:19:03
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What was the issue in the end?
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robk
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RE: robk's MR2 Turbo
2013/12/11 00:13:51
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just_ace
What was the issue in the end?
As expected, the issue was the width of the teeth on the 60-2 wheel. I was having trouble getting email responses from RacerX (which is unusual), and I was sick of paying for shipping from the US, so I decided to design my own 36-1 crank trigger wheel in CAD and had it laser-cut locally. The teeth are about 40% wider than those on the 60-2 wheel. The NUMBER of teeth on the 60-2 wheel was never a problem, it was just the WIDTH of the teeth. At high RPM (~6700rpm) they became just marginally too narrow to provide a reliable signal from the hall effect sensor. Actually, I should also mention that the first 1 or 2 dyno runs were always OK to the redline, but then it would always misbehave after that, so it's probably somehow temperature-related too. I could have designed a 60-2 wheel with slightly wider teeth, or it may have been possible to somehow make the existing 60-2 wheel work, but it was easier to reduce the number of teeth so I could make them significantly larger and be confident that the problem would be solved. Besides, 36 teeth is still plenty!
post edited by robk - 2013/12/11 09:05:01
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Mr2gtracer
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RE: robk's MR2 Turbo
2013/12/11 09:51:55
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With the issue resolved, I can't wait to see you crack the 300 mark :D
1990 JDM MR2 GT 145KW at 9 PSI
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robk
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RE: robk's MR2 Turbo
2013/12/14 12:50:23
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It's time for a dyno graph! The result (on 98 premium fuel) is: 300.8rwkw at 24psi, dropping down to no less than 292.5rwkw with higher ambient temperature. The little dip in the power curve at high RPM in the first plot was due to the issue that I previously mentioned, which was resolved when I changed the crank trigger wheel.   I went for a good drive on the way home from MRC, and the car feels so damn good! The GTX3076R sounds ridiculously good, from as low as 2000rpm. I don't know if it's mainly due to the new compressor wheel or the anti-surge housing. The OS Giken R2CD twin plate clutch is much nicer than I expected it to be, which I'm very happy about too. The E85 tune will happen next year.
post edited by robk - 2014/06/19 05:14:27
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Dudeman
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RE: robk's MR2 Turbo
2013/12/14 13:00:26
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You gotta record and post a sound file of the spool, the afterglow we don't want to know...
Looking forwards to your track day smirk!
Congrats for hitting your target Rob - next will be your mrs goals of mortgage and family!!
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dasic1
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RE: robk's MR2 Turbo
2013/12/14 13:01:20
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just_ace
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RE: robk's MR2 Turbo
2013/12/14 13:22:04
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So how does it compare to response than the ol 3082 setup?
Awesome power gain.
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Mrskylighter
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RE: robk's MR2 Turbo
2013/12/14 13:33:51
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robk
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RE: robk's MR2 Turbo
2013/12/14 14:02:19
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Thanks guys! just_ace
So how does it compare to response than the ol 3082 setup?
It passes 20psi of boost at about the same RPM or maybe 100-200rpm sooner than the 3082 did. As expected the 6mm smaller compressor wheel partially makes up for the loss of response from the bigger exhaust A/R. It's hard to tell because I hadn't driven the car for 5 months before today, but it 'feels' more insanely torquey between 3500 and 5000 rpm.
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kojab
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RE: robk's MR2 Turbo
2013/12/14 14:22:42
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Great result. Just keep away from wet roads. How many more KW would you expect with E85?
92' SW20 3SGTE GEN2 GT Hardtop Holden Ls1 ECU 87' AW11 3SGTE Delco EFI ECU & 21 psi boost 71' KE25 3TGTE Delco EFI ECU Standard engine 24 psi boost 78' KE55 L67 Delco EFI ECU
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robk
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RE: robk's MR2 Turbo
2013/12/14 14:30:50
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Thanks Richard.
Yeah wet roads are a no-no. It easily spins the wheels in third above 4500rpm in the dry.
With E85 I'll be able to safely run about 26-28psi with more ignition timing, so there is a lot to gain.
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MIDN1T3
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RE: robk's MR2 Turbo
2013/12/15 12:00:47
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Nice figures Rob, bet you're happy with that!
If you get a chance, I'd (and I'm sure a few other people) love to see a video of it taking off :)
1990 SW20 MR2 N/A with 1994 Gen 3 GTS 3S-GTE swap.
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stuka
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RE: robk's MR2 Turbo
2013/12/15 21:01:44
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great result Rob, will look forward to seeing it in january at last. the w2a performed well?
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robk
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RE: robk's MR2 Turbo
2013/12/15 21:49:11
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stuka
great result Rob, will look forward to seeing it in january at last. the w2a performed well?
I actually just got home from doing the new A2W test tonight. I'm preparing the plots now, I'll post them shortly.
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