The Definitive "VVT swap into 90-97 chassis" Megathread.
#42
Cpt. Slow
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That's what we're finding on our MSM swapped '92. In order to have a tach with '01+ coils, you need to have a tach output pin on the ECU to go to the cluster.
FYI: For those of you running Gen1 MSPNPs, DIYautotune will do the mod for a tach output pin for $75 once you ship it to them. I believe the schematic for a DIY circuit is floating around here somewhere.
I'm fairly certain Gen2 MSPNPs already have a tach output pin.
FYI: For those of you running Gen1 MSPNPs, DIYautotune will do the mod for a tach output pin for $75 once you ship it to them. I believe the schematic for a DIY circuit is floating around here somewhere.
I'm fairly certain Gen2 MSPNPs already have a tach output pin.
#43
Cpt. Slow
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Note: this thread is meant for standalone ECU replacements, such as MS and AEM.
For those of you wanting to use a stock ECU, please keep the discussion in this thread:
https://www.miataturbo.net/engine-pe...athread-80666/
But to sum up: stock ECU won't see a tach signal with '01+ coils, and it'll kill itself within a few seconds.
Remember, DON'T discuss those issues here.
For those of you wanting to use a stock ECU, please keep the discussion in this thread:
https://www.miataturbo.net/engine-pe...athread-80666/
But to sum up: stock ECU won't see a tach signal with '01+ coils, and it'll kill itself within a few seconds.
Remember, DON'T discuss those issues here.
#44
Supporting Vendor
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Example tach circuit for 90-93 Gen 1 is shown here:
MS1/Extra Hardware Manual
In most cases, I'd recommend purchasing an aftermarket tach adapter before sending an ECU in to be modified. Cost would be about the same or less and would eliminate down time.
#45
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In the event that you plan to keep your 94-95 block and simply update to the VVT head, is it still recommended that I update to the crank trigger setup instead of the CAS that is on the original head? I certainly understand that new ignition (in my case I will upgrade to COPS) and VVT actuation will need to be wired in. The throttle body update is suggested, but not a have to. I'm starting to add up the wiring harness needed for the pigtails along with all the sensors and the difference in cost from just getting an entire 01+ engine gets smaller and smaller. Again, this is all assuming the use of MS EM.
#48
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So I might as well just get a complete VVT engine and stop trying to gather the parts to make it work with my 95 block. I'm still educating myself on the differences required to work with VVT. Thanks for the assistance.
#51
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99-00 coils are garbage, you're much better off retaining your stock 1.6/1.8 coils if you are doing a BP4W swap. I specifically left 99-00 coil info off the OP for that reason.
#57
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It does, and the stock VVT coils fit into the VVT holes. The 99-00 has the same holes as the 90-97, so you would just use stock 90-97 coils instead of the 99-00 coils. If you're going to go aftermarket, skip the fab 9 parts and go straight to an LS2 Truck coil setup.
- If you are swapping a BP4W into a 90-97, use stock 90-97 coils and wires (preferably the 94-97 coils)
- If you are swapping a BP6D (VVT) into a 90-97, use VVT coils and wires and wire them per the original post's instructions
#59
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A 3rd party has tested the coils; we have not. The 3rd party test was not flattering. I have no horse in the race, other than the vendor was blaming my ECU for the troubles with his product.
#60
Only 90-93 Gen1 MSPNPs do not have a built in tach output. The Gen 1 94-95 and 96-97 already have it built in, as do all models Gen2 and Pro PNPs.
Example tach circuit for 90-93 Gen 1 is shown here:
MS1/Extra Hardware Manual
In most cases, I'd recommend purchasing an aftermarket tach adapter before sending an ECU in to be modified. Cost would be about the same or less and would eliminate down time.
Example tach circuit for 90-93 Gen 1 is shown here:
MS1/Extra Hardware Manual
In most cases, I'd recommend purchasing an aftermarket tach adapter before sending an ECU in to be modified. Cost would be about the same or less and would eliminate down time.
My 92 is the one curly mentioned, would you happen to have a link to an aftermarket tach adapter that would work for such an application?