Yes. Wastegate is supposed to be 6psi, though with the MBC removed and just a straight line to the wastegate, I only hit 4psi. My gauge may be unclocked slightly though, and if it is, then even with the boost controller all the way down, it is still increasing the boost 2psi.
I did it again!
- Thread starter 6speed
- Start date
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- 92 & 16 Meyatas
ya, gottcha...forgot about the wastegate..so you hadn't turned the boost up much at all then?
I had it up to 12psi when tuning, but that is when we were finding that there was a clog somewhere. With the clog gone, the car is so much faster at 6psi than it was at 10-12 before. I don't feel much of a need to turn it up any more right now. I am also not tuned for high rpm over 7psi (where that 12psi was falling off to), so keeping it down is safer.
I'll get tuned up to 12 at some point just for numbers and in case I end up wanting more, but on the street ... eh, it's plenty fast for me. I don't find myself wishing for more right now. I can get rear grip problems at full throttle in 1st or 2nd on any of my tire sets except my track tires, and cruising in 6th at 75mph I can still plant my foot and be into triple digits rather quickly, on-par with that V8 Challenger monday night.
I'll get tuned up to 12 at some point just for numbers and in case I end up wanting more, but on the street ... eh, it's plenty fast for me. I don't find myself wishing for more right now. I can get rear grip problems at full throttle in 1st or 2nd on any of my tire sets except my track tires, and cruising in 6th at 75mph I can still plant my foot and be into triple digits rather quickly, on-par with that V8 Challenger monday night.
Just ordered this.
https://www.amazon.com/dp/ (commissions earned)
I need an AFR gauge, but haven't gotten one because i haven't wanted a million gauges. This one solves that problem by letting me just replace my FM boost gauge with this one, without loosing boost but gaining AFR.
I'll be starting work on building and fitting my splitter this weekend.
https://www.amazon.com/dp/ (commissions earned)
I need an AFR gauge, but haven't gotten one because i haven't wanted a million gauges. This one solves that problem by letting me just replace my FM boost gauge with this one, without loosing boost but gaining AFR.
I'll be starting work on building and fitting my splitter this weekend.
I ended up hurting my knee before the prior weekend, so no splitter yet.
This past weekend I pulled the turbo and upgraded the studs to iconel. No pictures because well, it's just the turbo out, then in again. One more thing I won't have to worry about breaking on track.
Also installed the AEM wideband. It is confirming that I'm still richer than I should be (10s). I suspect I may have pinched the vacuum line to the gauge, so I'll have to be re-running that i think. At first, I was in boost and the gauge was still reading 0, then it finally lurched up to 5psi. That might have been the pressure in the line un-kinking something. Boost is showing 5.7psi at full throttle, but not sure if i can trust that yet if the signal line had a problem with it.
This past weekend I pulled the turbo and upgraded the studs to iconel. No pictures because well, it's just the turbo out, then in again. One more thing I won't have to worry about breaking on track.
Also installed the AEM wideband. It is confirming that I'm still richer than I should be (10s). I suspect I may have pinched the vacuum line to the gauge, so I'll have to be re-running that i think. At first, I was in boost and the gauge was still reading 0, then it finally lurched up to 5psi. That might have been the pressure in the line un-kinking something. Boost is showing 5.7psi at full throttle, but not sure if i can trust that yet if the signal line had a problem with it.
Just got back from an autocross with SCCA Northern NJ Region. The rear gear change put me in SSM, though the car would be more fairly classed in Street Prepared somewhere, so I got rofl-stomped in SSM times. Definitely not set up for autocross, but it was nice to feel out the limits of the Khumho XS tires. Lots of grip limit information, and very controllable when they do let go. Should do really well on track.
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- 92 & 16 Meyatas
well at least you had the car running right!
Yes, there is that 
I spent some time Saturday cleaning up the AFRs from all the other fixes, just "street tuning". Holds a stable 11.0-11.5 AFR in boost. I'll still need to get the 3,000-4,000 vacuum AFRs leaner. The Hydra's interpolation logic often puts me into the 11s while just cruising on the highway, since the turbo start spooling so easily that I am often just barely in low vacuum pre-boost with any sort of slight incline in 6th gear.
I spent some time Saturday cleaning up the AFRs from all the other fixes, just "street tuning". Holds a stable 11.0-11.5 AFR in boost. I'll still need to get the 3,000-4,000 vacuum AFRs leaner. The Hydra's interpolation logic often puts me into the 11s while just cruising on the highway, since the turbo start spooling so easily that I am often just barely in low vacuum pre-boost with any sort of slight incline in 6th gear.
Lots of track prep over the last few weeks. Watkins Glenn this weekend.
Confirmed alignment bolts keep loosening up. I have a full set of OEM replacements in hand, going for another alignment and probable bolt replacement friday morning.
Left rear brake caliper that I replaced last fall probably never worked right to begin with, and trying to swap in the new track pads found that I couldn't adjust the piston at all. Got a replacement in and everything works. I clearly have a lot of rear braking back.
Brand new rotors and pads all around, Carbotech XP12s front, XP10s rear, up from 10s/8s.
Flushed brake fluid again.
Still no splitter or undertray, lots of holdups and issues with getting that done. I won't have my hardtop for this track event too (so I can use my rollbar to carry my track wheels/tires up as well, rather than 10+ hours of street driving my track set), so that will kill a lot of my top speed anyway.
Confirmed alignment bolts keep loosening up. I have a full set of OEM replacements in hand, going for another alignment and probable bolt replacement friday morning.
Left rear brake caliper that I replaced last fall probably never worked right to begin with, and trying to swap in the new track pads found that I couldn't adjust the piston at all. Got a replacement in and everything works. I clearly have a lot of rear braking back.
Brand new rotors and pads all around, Carbotech XP12s front, XP10s rear, up from 10s/8s.
Flushed brake fluid again.
Still no splitter or undertray, lots of holdups and issues with getting that done. I won't have my hardtop for this track event too (so I can use my rollbar to carry my track wheels/tires up as well, rather than 10+ hours of street driving my track set), so that will kill a lot of my top speed anyway.
Back home. Watkin's Glenn is such an awesome track to drive! Lightning was fun, but not thrilling, Summit was ok, just barely 'fun', almost not. Watkin's Glenn is soooo much better than both of those. Great rythmn, suits my car well, fast, lots of elevation changes, lots of cambered turns, etc... The HPDE2 group was very well behaved, and I spent a lot of the time we did get without cars around me. About the only 'encounter' story i have is from a Cobra replica that I caught in 2 laps after giving everyone a 20 second head start out of pit lane, then pulled through the pits again because of the train that the Cobra was on the tail end of, waited 10 seconds, set off again, and caught the Cobra again within a lap. I never got past him though, because he apparently had the attitude "no way this Miata is faster than I am!" Uphill out of the toe of the boot (turn 7) is the only place he was faster. I was faster in every turn, and could hang with him on the straight, in part because of my superior corner exit speed.
I got approved to request a check ride for DE3 (Advanced group) at my next event.
Car held up well. Saturday at 83F and 7.5psi on the FM2, I tripped my 205F coolant temp warning briefly. I bumped the warning light threshhold to 210F, and today, at 80F and 8.5psi, I only tripped it when following a similarly fast car. If they were much slower, I wouldn't be in the gas enough, and if they were faster, they weren't in front of me long enough to disrupt the airflow. I'll need to work on cooling more, some shrouding, a splitter, and/or AC delete would all likely work just fine. So they are probably all going in. The car has great low speed 3rd gear balance, maybe a touch of understeer, but all other high speed corners have too much understeer. Even a small splitter would work wonders, as I expected.
I went without a hard top so i could bring the track tires without risking a street-side puncture ruining my weekend, and that was easily killing my top end speed by ~7-10mph on the back straight before the bus stop.
I'm pondering an AC delete and re-mounting the radiator into a V mount, as there is about an inch to drop it down, and maybe 4-5 inches to move the top forward. New brackets would be needed, but would double the hood venting area I can use along with the benefits of any V mounting of the radiator.
Tires and brakes were great. The XS tires have tons of feedback and a nice howl regardless of the speed you are at the limit with, and they are incredibly consistent. There is no appreciable fall off or greasing up of the tires as I put heat into them, and I did plenty of that in back to back to back corners. Turn 5, 6, 7 along should be enough to overheat tires if they don't like heat. They did just fine every lap.
I got video of every session, and there are some pics from a photographer friend that I'll have up.
I got approved to request a check ride for DE3 (Advanced group) at my next event.
Car held up well. Saturday at 83F and 7.5psi on the FM2, I tripped my 205F coolant temp warning briefly. I bumped the warning light threshhold to 210F, and today, at 80F and 8.5psi, I only tripped it when following a similarly fast car. If they were much slower, I wouldn't be in the gas enough, and if they were faster, they weren't in front of me long enough to disrupt the airflow. I'll need to work on cooling more, some shrouding, a splitter, and/or AC delete would all likely work just fine. So they are probably all going in. The car has great low speed 3rd gear balance, maybe a touch of understeer, but all other high speed corners have too much understeer. Even a small splitter would work wonders, as I expected.
I went without a hard top so i could bring the track tires without risking a street-side puncture ruining my weekend, and that was easily killing my top end speed by ~7-10mph on the back straight before the bus stop.
I'm pondering an AC delete and re-mounting the radiator into a V mount, as there is about an inch to drop it down, and maybe 4-5 inches to move the top forward. New brackets would be needed, but would double the hood venting area I can use along with the benefits of any V mounting of the radiator.
Tires and brakes were great. The XS tires have tons of feedback and a nice howl regardless of the speed you are at the limit with, and they are incredibly consistent. There is no appreciable fall off or greasing up of the tires as I put heat into them, and I did plenty of that in back to back to back corners. Turn 5, 6, 7 along should be enough to overheat tires if they don't like heat. They did just fine every lap.
I got video of every session, and there are some pics from a photographer friend that I'll have up.
One of my laps, possibly my best one. I had a lot of clear track all weekend, but despite that, I almost never had a 100% clean lap. Excuse the annotations for friends and family that only have a vague idea of things related to cars
https://www.youtube.com/watch?v=jqPTPO7JPf4
https://www.youtube.com/watch?v=jqPTPO7JPf4
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- 92 & 16 Meyatas
Nice mike! I was waiting to see you catch him!! 
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- 92 & 16 Meyatas
JK.... But it did look like you did better in the corners?
No, i think he was a bit better technically, probably had wider tires of a better compound. I was much faster through turn 10 and 11 than he was, but for both days, every car that I followed through 10 and 11, or 2 and 3, I was much faster through those corners. That's mostly due to not being nearly as nervous about the corners as the others in my run group. Like nearly everyone in my group lifted going through turn 3, where as I only lifted briefly on turn in to 2 to prevent the front from washing left like happened in the video, and then i was at full throttle never lifting until the bus stop. I would gain on every car there significantly, even if they then walked away from me down the back straight. Only the other Miatas weren't lifting, and there I was hauling on them just from the power disparity. 10 is a similar deal, only the other Miatas were taking it with just a bit of a lift and not braking, same as I was, so I'd close up hugely on everyone that braked heavily for it.
A lot of the time in the post-session discussions people would talk about how nervous various corners made them, but none of them really made me nervous. Incredibly fun track.
A lot of the time in the post-session discussions people would talk about how nervous various corners made them, but none of them really made me nervous. Incredibly fun track.
Differential casing arm snapped. And I'm guessing it snapped a month or so ago when I started hear odd rear end noise. Likely snapped from driving over pot-hole-ridden train tracks near where i park for work that I have no options to avoid. Filed a claim with my insurance company to see if they are willing to cover the repair. Yeah, that means I probably did the track weekend with this broken, which is scary.
