Originally Posted by hustler
(Post 938146)
I understand that, but I don't have a TDC reference with the VVT engine like I did the 99 engine.
|
I wonder if limiting air-flow with the cam in the cruise cells can increase fuel economy?
|
1 Attachment(s)
Originally Posted by hustler
(Post 938152)
I wonder if limiting air-flow with the cam in the cruise cells can increase fuel economy?
Running the EGR solenoid should also yield MPG improvements, though controlling it still seems to be uncharted territory. Oh, you had your port welded closed, right? What are you doing for emisssions testing? https://www.miataturbo.net/attachmen...ine=1349938008 |
Originally Posted by Bryce
(Post 938155)
I'm pretty sure there are gains to be had with adjustments in the cruise cells. You're the best candidate to find those gains too. Advancing the can in cruise conditions will produce an EGR-like effect. If we're only advancing 38* out of a possible 44*, there should be possibility for improvement. Now in your arsenal of MPG-improvement tools is VVT, injector timing too. I will be interested in what you come up with for that.
Running the EGR solenoid should also yield MPG improvements, though controlling it still seems to be uncharted territory. Oh, you had your port welded closed, right? What are you doing for emisssions testing? https://www.miataturbo.net/attachmen...ine=1349938008 I plan for this car to legitimately pass emissions...next year. It's due for inspection this month and has severe exhaust leaks. |
Also, praise Satan for VEAL. Maybe I'll just run 75% authority on EGO so I don't have to jack with fuel.
I may drive to Austin tomorrow to eat BBQ while working on fuel economy. |
6 Attachment(s)
So I jacked with VVT adjustments going for max VE value in VEAL and this is the best I could come up with:
https://www.miataturbo.net/attachmen...1&d=1349975175 However you can still see the massive dip: https://www.miataturbo.net/attachmen...1&d=1349975313 I'm guessing that's exhaust cam related. I'll work on cruise later. |
You don't want 10 degrees of advance at idle.
|
Originally Posted by Reverant
(Post 938272)
You don't want 10 degrees if advance at idle.
|
Why is it so hard to find a VVT head for sale? Are the valve covers hard to come by?
|
Originally Posted by hustler
(Post 938446)
Why is it so hard to find a VVT head for sale? Are the valve covers hard to come by?
|
Tom at partsgroup.com had some last time I asked him.
|
Tired of tuning, I need a driver. I still have a weird VVT dip at 3500-4000rpm and I just can't figure it out.
|
Originally Posted by vehicular
(Post 938454)
Tom at partsgroup.com had some last time I asked him.
|
Originally Posted by hustler
(Post 938477)
Tired of tuning, I need a driver. I still have a weird VVT dip at 3500-4000rpm and I just can't figure it out.
|
I have two idle conditions:
Car idles great, even with the AC. It barely idled with the AC previously, I guess that's because the engine was shit. I'm giving it away, lol. 90% of the time idle is great, 10% of the time it whacks out and lopes like it has a big-ass cam. Then, I plug in VVTuner and the chugging/loping stops. What's going on? |
1 Attachment(s)
Originally Posted by emilio700
(Post 938479)
Intake pipe resonant volume and length. Try changing intake pipe length. Either really short, or 21-24". Has nothing to do with VVT, or timing advance.
Does anyone know where I can get one of these with a significantly tighter radius? https://www.miataturbo.net/attachmen...ine=1350023114 |
Post your latest VVTuner map.
|
3 Attachment(s)
https://www.miataturbo.net/attachmen...ine=1350023635
https://www.miataturbo.net/attachmen...ine=1350024009 Attachment 239815 The log is too big to upload. Is this the dreaded sync-loss problem? The car drives fine and it seems the only sync-loss problems are at idle. I've seen none when driving. Should I close the gap on the CKP sensor and if so, how tight is too tight? |
Yes, it does seem like a sync loss there. What do the sync loss counter and sync loss reason say?
Set the advance to 0 on all cells 1000-1500 and below 50kPa. Does idle oscillation stop if you disconnect the VVT valve? |
1 Attachment(s)
Originally Posted by Reverant
(Post 938492)
Yes, it does seem like a sync loss there. What do the sync loss counter and sync loss reason say?
https://www.miataturbo.net/attachmen...ine=1350025028
Originally Posted by Reverant
(Post 938492)
Set the advance to 0 on all cells 1000-1500 and below 50kPa.
Originally Posted by Reverant
(Post 938492)
Does idle oscillation stop if you disconnect the VVT valve?
|
All times are GMT -4. The time now is 11:46 AM. |
© 2024 MH Sub I, LLC dba Internet Brands