And here I was thinking I took forever to finish my build, thank you for making me feel better!!

Glad to see you getting everything sorted out though

 

Well new clutch is in with a freshly resurfaced flywheel. Now for some break in miles and than send it.

 

So got bunch of miles on the new twin disks and they seem to be holding. I have always loved shitty hard to modulate clutches that all my friends hate but this is a new level in a street car....wow. Its grab point is a few millimetres and its on or off. I only hope that the 5lb flywheel is whats keeping my 6 speed alive cuz the thing a beast. Its holding tho!
The car is amazing. I have a 730whp Foxbody and I feel this pulls just as hard (when it hooks). Its so unsuspecting and that has surprised a few (C5 with bolt ons, Few Hemi chargers and challengers, S550 stangs, Built A4, and a 750 bike on the hwy). Got a little more tuning to make the idle correct but the combination of power and handling is unmatched. Thanks everyone for the years of answering stupid questions.

 

 

So after almost 2,000 hard miles at 20+ psi I pulled the plugs to change them and see how things are doing and to my surprise, they look way better than I had expected. Good job on the tune 18PSI!
BMW Trans coming soon!

 

So its been on road all summer and I have been contending with violent wheel hopping issues and traction issues and as the temps came down the power went up and the traction got worse. Went from a 205 660 tire to a 225 AR1 to a 245 AR1 and now to a 225/50/15 ET street. Traction with the ET has got much better. This has never been built to be a drag car but it was plan scary in 1st 2nd and 3rd with tire spinning. Car definitely hurt some feelings on the streets, most dont see it coming as the car looks basically stock other than hood vents. Now with some traction I'm sure I will be finding the next weakest drivetrain link. Any bets? MSM 6-speed or the MSM rear (braces welded on)? I have a BMW 5-speed in garage waiting for the trans to go but it has not yet.... If that pops I'll prob swap trans in and see how long rear lasts, still dont own that replacement yet. Getrag or 8.8? Hmmmm
Picked up a Draggy as that seems to be the go to for testing, here my best 0-60 time in 45* weather on a unprepped street with tires hopping. I'm happy to be in the 3s. I still have to bump up the RPM so I can get to 60 with out a 3rd gear shift, hitting rev limiter right at end. Bet mid 3s are possible...here tesla tesla

 

Love it
I think the hop will likely kill the diff first, but we did manage to shear a 6sp output shaft clean off on a 500whp miata a few years back from doing a rolling burnout lol

 

Congrats on dipping into the 3 second range to 60. That is a pretty good milestone to reach for a miata.

 

car looks great! have been thinking about taking off the Tupperware side skirts on my MSM. Kinda like 'em off!

 

So car sat for August (100*+ here) and now cooler temps have come back and I have been driving it again and it has developed a high RPM miss. Changed plugs and the old ones gaped at 35 looked great but I replaced them and gaped down to 25 and same issue. Could an LS coil be failing?

 

Holy **** *****, you're concerned with the misfire, not running at 12.5 at 240kpa? Also your batt voltage goes to 12.6 at 6000rpm. Might look into that too.

Also, MSM should have VSS at the ECU. Calibrate it, set your gear, and then logs are more useful. Said 12.5 log is possibly due to lower gears ripping through the fuel table quickly, but I can't tell without gear/VSS reference.

Edit: Looking again, you're running 17-18 degrees at peak torque, seems a bit advanced for my liking, the whole table just doesn't decrease with boost very much. I usually decrease 1 degree per psi of boost, or 2 degrees every 14kpa. This has to taper off eventually, but using that math, your timing at 26psi, which is where your table ends at, would be at 4 degrees. I'm not saying run that, but maybe close to 10, I realize you're only running about 20 psi, but if anything happens and you overboost, your timing isn't going to drop almost at all.

 

Most of this is well above my MS expertise. Vladi tuned it 1.5 years ago and I have done nothing but drive it. Love it.
12.6 does not sound bad but could it be low enough to effect coil firing?

 

Anything in the 12s at 18psi is going to be bad for the long term health of your pistons. The bigger problem is your alternator. That'll go up and down the dead time table, wrecking havoc on all Vlad's hard work. Fix that first (belt slip maybe?), then do another log in 5th from a low RPM to redline.

 

So what explains it being over 1pt of the target AF?

 

5th.... I dont want to be in this car at redline in 5th! 3rd is scary enough. Maybe you could talk me into 4th lol

Belt slip.....I'll check it today.
When we were street tuning it I gave up at 15psi in 3rd gear pulls and went to dyno after almost hitting a racoon at 80mph.

 

Checked and old log from April 22 and battery voltage is steady at 14V through the pull. Think you might be onto something.

 

Voltage is stable and AF is better. Maybe just an electrical issue. I hope. Check when I get home. Thanks Bro!

 

If your voltage is 12.5 instead of 14, all your voltage compensations for injectors, idle valve, etc change. Most people don’t do a lot of tuning at 12.5 volts, so I wouldn’t expect it to be perfect. Your fuel pump is also stressed enough at those demands, and then whatever problem you’re having is also giving it 10% less voltage, so your fuel pressure might be dropping too. This is why I like a fuel pressure sensor, and properly set up compensation. As FP drops, the ecu should compensate with more DC.

 

Got your logs, will check them out when I get a chance. The AFR was nowhere near 12.5 when we tuned so stay out of boost until we figure out the culprit. I agree with Curly, either dying fuel pump or voltage drop could be it, among other reasons.

*EDIT: reviewed logs. I stand by the above. Nothing else stands out to me. Let's get a fresh pump in there since you already have one and was planning to drop it in anyway.


1,000% agree with this. TRUTH

 

After 14 months of trying to find the issue with my turbo Miata It has finally been solved. Backstory, in 2023 my 2004 MSM at for the summer and in September I drove the car and had a high RPM miss when over 20psi. On WG pressure (10psi) it ran fine. Tried new plugs coils and closed the gap and found no solution. Was planning on going to E85 so replaced the fuel pump with a 540 and installed a flex fuel sensor and had it returned. Now on E85 had the same miss at high boost on dyno. Tuner noticed on the Dyno that voltage dropped at WOT so chased that down and replaced the 2004 Alt with a 1997 Alt that was internally regulated and then voltage was happy, but still had this miss. Put the car back to 93 and fixed the tune and still had the same miss. Today I replaced the Magnacore spark plug wires a new plugs gapped to .025 and the car finally ran great! It's back to its terrifying self again! Now I need to get the E85 tune back in it and turn it up! Hope this helps someone

Now 18PSI where are you....its tuning time!