djwarner

My son bought me a Dragy module so I could measure 0-60, quarter mile times, etc. One of the features is an internet posting of results that is searchable by make/model etc.

For my first test drive without trying too hard, I managed to record a 0-60 in the 4 second range. I was surprised to see there was no Miatas listed there.

Since I have only a naturally aspirated LFX on stock tires, the 0-60 times were within my expectations. I was wondering how other swapped MX5s were doing and how they measured it.

One feature of the Dragy is that they measure the elevation change doing the run and you need a minimum change to record a valid test.

Rdb138

Fellow LFX swapper here. I tend to live on the MiataTurbo forum because it's a bit more active, but do come over and look at swaps etc. over here from time to time.

I have just started to drive mine in the last two weeks...about 10 miles so far, and haven't even seen redline yet. In other words, I don't have any performance measures to share, but I would love to know more about your car and what numbers you recorded. Mine is more of a track car build, but registered to drive on the street right now. I have an NB and I would guess my car is around 2200lbs, running 3.42 rear end and the M5V 6 speed.

djwarner

I have 6K miles on my swap and going strong. My LFX is coupled to a 6L50 and a 3.23 limited slip differential. The drive train came out of a 2012 Camaro with 22K miles on it when it was totaled. Swapped into a 2011 Touring PRHT.

My intent was to make it a grand touring road car with no serious intent of tracking the car. As such I went the extra mile to install AC PS PB ABS. A third party BCM gave me paddle shifters and cruise control

The 3.23 was matched up with 20 inch wheels in the Camaro, so running stock Miata wheels, this effectively is as if the diff was a 3.86.

The exhaust was an aftermarket unit designed for the 350Z with Helmholtz resonators through racing cats. Engine and transmission were tuned with HP Tuners software. Power is something like 320HP at the wheels. Suspension was upgraded with MeisterR ZetaCRD Coilovers. With the transmission in sport mode, I have no problem running up to red line during hard acceleration.

I haven't tried pushing the 0-60 times yet, just started playing with the Dragy. Starting from the engine at idle rather than revving up and holding with the brakes, I recorded 4.87 seconds in 228 ft and a peak g load of 0.8 Gs. Expect to see improvement on my next outing.

Rdb138

Your car sounds great! Nice job getting all of the "extras" working properly. AC in FL is a must! I know getting all of that working wasn't the easiest.

I'm dealing with all the teething issues of just starting to drive a car you had all apart and just put back together, but she definitely has plenty of torque and power. That's great you can get the power down on the road. That makes me feel better. Mine just wants to spin the tires right now. (I really need an alignment and my tires are 2-3 year old heat cycled out track tires too.) I'm going to buy new tires and go up a size (245/40 R15) when I go to get a proper alignment once its dry / warm enough around here. I'm thinking that will help a bunch.

Thanks for sharing the info. That's already impressive numbers for starting at idle, can't wait to see what you come up with when you are trying!

djwarner

With 245/40R15 and a 3.42 diff this would be equivalent to a 4+ diff in the Camaro with 20 inch wheels. It no wonder you spin the tires in such a light car.
When I was tuning with HP Tuners, I found the output torque was limited by the virtual torque table. In essence, for a given rpm and gas pedal position, the table determined how much torque to let the engine make. Once you got there, the ecu limited the throttle plate opening. At a certain point in my tuning process, from a stop, any throttle opening was spinning the tires and it continued until the engine returned to idle. I had to roll back the VTT below 2800 rpm to get it civil. This was with Cooper 205/45R17s. I have since gone to Michelin 205/45R17 all season tire and they have much better traction. May have to revisit the VTT to take advantage. (BTW VTT tuning is the last step in performance tuning not the first.)

Rdb138

15" tires are pretty much the standard on NA/NB Miatas, especially if you track the car. I know others have been able to make this setup work, so I think it's just teething issues. (They also don't tend to use 1st or 2nd gear on the track either, but with all the torque, there really is no reason. I'm amazed at how the car pulls in down low in 3rd gear in what little driving I've done so far.

I haven't even begun to do any tuning to the car. I'm using the tune that came from Kiesler Automation. I purchased the ECU with a tune on it from him. The Kiesler tune seems fine and I have so many other things I still need to work on, so leaving this alone for now. Additionally, I haven't done enough studying to attempt to try and tune my own car at this point. Very cool that you have taken the time to learn how to do that. That's really interesting about the virtual torque table. Sounds like Chevy was trying to make the car safer /civil for their customers. Can't blame them for doing that, especially with the base model engine.