Bolt on VVT swap dyno
07-08-2015, 08:04 PM
#1
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Bolt on VVT swap dyno
Well I put the Miata up on the dyno today. Mustang dyno in Greenville SC.
Quite a bit more than I was expecting honestly, and it makes me wonder if the dyno wasn't reading a bit high. It's a brand new Mustang dyno, though, and when they were calibrating last week it read exactly 10% lower than the Dynojet across town, which is the NASA-advertised amount. 139hp uncorrected, but it was about 95 degrees today. Car details:
95 chassis
MS3 Basic ECU
02 junkyard engine (52k miles)
UK square top manifold
3d printed air intake (Cold Air Intake)
racing beat header + no cat
used borla catback
Spent about 2 hours fiddling with the tuning and was able to pull about 2 extra HP out of it through increasing VVT target on the high end a couple degrees but that's about it. Ignition timing was spot on from the Reverent base map - any more or less and it lost power. VE settings were pretty spot on from using VEAnalyze on the road.
Car feels great! Cheers, and thanks all for the help!
And a video:
Quite a bit more than I was expecting honestly, and it makes me wonder if the dyno wasn't reading a bit high. It's a brand new Mustang dyno, though, and when they were calibrating last week it read exactly 10% lower than the Dynojet across town, which is the NASA-advertised amount. 139hp uncorrected, but it was about 95 degrees today. Car details:
95 chassis
MS3 Basic ECU
02 junkyard engine (52k miles)
UK square top manifold
3d printed air intake (Cold Air Intake)
racing beat header + no cat
used borla catback
Spent about 2 hours fiddling with the tuning and was able to pull about 2 extra HP out of it through increasing VVT target on the high end a couple degrees but that's about it. Ignition timing was spot on from the Reverent base map - any more or less and it lost power. VE settings were pretty spot on from using VEAnalyze on the road.
Car feels great! Cheers, and thanks all for the help!
And a video:
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Last edited by Morello; 07-09-2015 at 09:54 PM.
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07-10-2015, 09:46 AM
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Oh, what I would have given to have a garage like when swapping mine. I had to do mine in a single car apartment garage.. Fitting a Miata, extra engine and trans, cherry picker, all my tools and spare parts in a one car garage was a challenge in itself.
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07-10-2015, 10:28 AM
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Take a look at the link in the OP. I drilled a hole in my maf sensor and installed the iat sensor there. It heat soaks a little but it runs fine after about 30 seconds. I bought the hoses, clamps and filters off amazon for about $80 altogether and got the 3d printed part in one piece from makexyz for $82.
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07-10-2015, 10:49 AM
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07-23-2015, 09:11 PM
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Nice dyno numbers... Torque curve looks fairly flat without the typical mid-rpm dip that stock Miata's tend to have.
I am surprised to see 9 degrees of intake cam advance on the top end. Did you try lower values like 5 or 0 degrees? Most tgreads on this forum covering VVT tuning suggest reducing advance to 0-5 degrees above 5500rpm. Assuming that you did try less advance and the dyno showed less power, any idea why your setup likes the additional high RPM advance? (It does go against the theory of adjustable intake cams, not just forum posts...)
Thanks
I am surprised to see 9 degrees of intake cam advance on the top end. Did you try lower values like 5 or 0 degrees? Most tgreads on this forum covering VVT tuning suggest reducing advance to 0-5 degrees above 5500rpm. Assuming that you did try less advance and the dyno showed less power, any idea why your setup likes the additional high RPM advance? (It does go against the theory of adjustable intake cams, not just forum posts...)
Thanks
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07-23-2015, 10:01 PM
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<p>You have 2 rows in your ignition table set at 100kpa load. Set your top ignition load row over 100kpa.</p><p> </p><p>I'm super jealous of your power. I think we need some drag times to substantiate. 
My very similar build makes <120whp on our dynapack. </p>
My very similar build makes <120whp on our dynapack. </p>
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