My dyno day
2 Attachment(s)
So I finally got the car to the dyno! :)
Started off bad running into problems with a choke when we went into boost. I had no idea about the overboost protection setting so it took awhile before we found out that was the problem, but it was all uphill from there. We ran out of time tonight and the owner told me to come back tomorrow and we'll finish it up. I'm lucky I was hooked up with this guy through a buddy cause he's letting me stick around and help out tuning the car so I can learn. Basically he's doing the driving and I'm doing the computer work. I'm actually liking it. At first I was like fuck megasquirt and tuning, but I'm starting to learn so its alot of fun. Tomorrow the plan is to finish the tune we're on now, then do a emissions tune, and then a high boost tune. Right now as it sits I'm making 221hp and 200tq, and that's on the wastegate only, no MBC hooked up. Sits right around 8psi but spikes to 10psi or at least it seems. Tomorrow we are going to hook up his boost gauge to verify. *Does anyone else have an issue with a hiccup right around 3800-4200rpms? It seems like no matter what we do (lean or rich) it still hesitates right at the same spot. Any advice? |
Strange that the hesitation wouldnt tune out. How is your plug gap and what plugs are you using?
Great numbers, I bet its fun.. I cant wait to see what it makes on high boost. |
Originally Posted by Fireindc
(Post 483380)
Strange that the hesitation wouldnt tune out. How is your plug gap and what plugs are you using?
Great numbers, I bet its fun.. I cant wait to see what it makes on high boost. Thanks man, I cant wait to see what it'll make closer to 15psi. :) Cant say if its fun though, not yet at least. Its still up on the machine, I'm leaving it overnight. Right when we were closing up his shop a guy dropped off a 427 cobra that is fucking MINT. I will be sure to take an assload of pictures tomorrow. |
o.0 haven't driven it yet!?! Holy shit tomorrow should be a fun day for you indeed. As for your misfire, i wish i had more insight. GL tomorrow.
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It's a long shot... but on my MS-II, I had it switching VICS at 5,000 rpm, and I had a hickup which wouldn't go away. Turned out, when it turned off the coil (at 5k), it would send a back-emf which would momentarily wig out the board. Putting a "flyback" diode on the valve helped.
Perhaps there's some inductive load you need to tweak, too? |
My car apparently had the same issue...here is the thread my car's PO started about the problem...
https://www.miataturbo.net/forum/t19690/
Originally Posted by Braineack
(Post 251744)
Yep, everywhere you see that freak out, TPSacc is kicking in.
you can see the green Accel:N box go red and show Accel:Y and you can see it when you turn TPSacc to show up in the log. go to accel wizard and tune your enrichments....in the least turn it all to 0ms and it wont kick in at all. this will cause lean spikes before you hammer it, but it's surely better than now. |
Huh, oh yeah. Is there software averaging? Perhaps turning it up...
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Originally Posted by Cspence
(Post 483397)
My car apparently had the same issue...here is the thread my car's PO started about the problem...
https://www.miataturbo.net/forum/t19690/ |
221/200 so far? Oh man you will be grinning tomorrow:D
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Those are good numbers for 8-10 psi how much spark are you running up top?
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Not sure what you're running, but I had similar hesitation issues with bad plug wires. Don't rule out the easy/stupid answer.
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Originally Posted by 18psi
(Post 483416)
221/200 so far? Oh man you will be grinning tomorrow:D
Originally Posted by miataspeed2005
(Post 483451)
Those are good numbers for 8-10 psi how much spark are you running up top?
Originally Posted by curly
(Post 483454)
Not sure what you're running, but I had similar hesitation issues with bad plug wires. Don't rule out the easy/stupid answer.
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It'd be weird since they're brand new, but it'd be the first thing I'd replace and check. I've had too many wild goose chases trying to track down a stumble only to find out it was my plug wires.
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Glad to see you around Vash :) Car is looking good.
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In the car at the dyno right now :)
We just changed the accel settings to all 0's and re-tuned the fuel table. No more hiccup. I love this forum! :bigtu: As the car sits its making 224hp and 205tq. Only change from yesterday was the accel wizard stuff and a little on the fuel table. Going to do some more runs now :) |
this time, post a real plot!
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Just turned up the MBC to 13psi :)
Made 250hp and 231tq Now going to play with the 10psi map some more. So I was incorrect before, I was actually at 9-10psi making 221. We are going to try and bring that number up now. |
Holy shit man...good stuff.
Waiting for a real plot of your target psi now. |
Make sure you don't bump your timing more than 20 up top. Can you do me a favor and ask him how much he would charge me for like 3-4 pulls. And doing my own tuning. Pm me a price
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Originally Posted by Vashthestampede
(Post 483672)
Just turned up the MBC to 13psi :)
Made 250hp and 231tq Now going to play with the 10psi map some more. So I was incorrect before, I was actually at 9-10psi making 221. We are going to try and bring that number up now. __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
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