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HotStreetVw
Samba Member
Joined: October 03, 2004
Posts: 871
Location: Wild West
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 Posted: Sun Jan 28, 2018 5:51 pm Post subject: Re: Freevalve engines |
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Would it need to sense cam position? Couldn't it just know TDC (36-1) and pick it's own cycle every time it's started?
| Max Welton wrote: |
I can see the control electronics being integrated into Megasquirt at some point. Also going to need a way to sense what would have been cam position though.
Max |
_________________
4inBhore
50 Split - 2724cc NA. Haltech injected
62 Notchback - 2542cc Turbo WIP |
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Max Welton
Samba Member
Joined: May 19, 2003
Posts: 10697
Location: Black Forest, CO
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ps2375
Samba Member
Joined: April 24, 2014
Posts: 2471
Location: Meridian,ID
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| Posted: Sun Jan 28, 2018 8:50 pm Post subject: Re: Freevalve engines |
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| nsracing wrote: |
| Can anyone think of any new innovations the Chinese ever done on their own? NO. They have to copy everything. |
I doubt they are "copying" this, I'm sure they are paying a licensing Fee to Koenigsegg. They may be the only ones out there willing to take this on, maybe the others think they can either do w/o or make it better for less. |
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LOWE TECH
Samba Member
Joined: June 22, 2016
Posts: 44
Location: SW Washington
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| Posted: Sun Jan 28, 2018 11:16 pm Post subject: Re: Freevalve engines |
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| I remember thrashing on N 14’s and such in the 90’s and Cummins was going to eliminate the cam. Maybe I was a lot more inspired then but I was following the tech bulletins with interest. Never happened. What the new cars are doing are incredible but the alure is gone. I sniff around this forum because I like the idea of refining a simple platform. “Refining” means different things to different people but having a computer involved with the process is not what I want from an ACVW. |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 12714
Location: Western Canada
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| Posted: Mon Jan 29, 2018 5:36 am Post subject: Re: Freevalve engines |
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| EVfun wrote: |
| When I want to drive a modern engine I'll borrow my wife's MX-5 and put its 6 speed to work. That little 4 goes faster than most street Bugs and offers heated seats, effective abs braking and traction control, and handling my favored classic cannot touch. |
So true!
| EVfun wrote: |
| I'm not all that impressed with it though, I've driven it 3 or 4 times in the past 2 years -- much less charm. |
It's the looks of the things I can't get past, those and the new Subys, look like something left behind by an elephant and styled by a 3 year old with a wooden spoon.
Most of the new generation of cars really...  |
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Max Welton
Samba Member
Joined: May 19, 2003
Posts: 10697
Location: Black Forest, CO
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| Posted: Mon Jan 29, 2018 12:09 pm Post subject: Re: Freevalve engines |
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My type-3 (with my conversion to modern injectors and MS control) looks nearly stock to the ordinary citizen.
I also have a brand-new base Subaru Impreza with 5-speed and I think the engine is a poor match to the manual transmission. In particular when I step off the throttle to shift, the RPMs just hang at 4k (or where ever I left the previous gear) and are still there when I'm ready to let the clutch out in the next gear.
And that takes the smile right off my face. 
I can tell you first hand that getting the MegaSquirt fuel and ignition surfaces to work well for the up-shifts was the hardest part. And a non-issue for an automatic transmission car.
Max
_________________
1967 Type-3 Fastback
Under the Knife https://shoptalkforums.com/viewtopic.php?f=24&t=151582
Home Stretch https://www.thesamba.com/vw/forum/viewtopic.php?t=767836 |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 12714
Location: Western Canada
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| Posted: Mon Jan 29, 2018 7:09 pm Post subject: Re: Freevalve engines |
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| Max Welton wrote: |
My type-3 (with my conversion to modern injectors and MS control) looks nearly stock to the ordinary citizen.
I also have a brand-new base Subaru Impreza with 5-speed and I think the engine is a poor match to the manual transmission. In particular when I step off the throttle to shift, the RPMs just hang at 4k (or where ever I left the previous gear) and are still there when I'm ready to let the clutch out in the next gear.
And that takes the smile right off my face.
I can tell you first hand that getting the MegaSquirt fuel and ignition surfaces to work well for the up-shifts was the hardest part. And a non-issue for an automatic transmission car.
Max |
The transmission should have very little to do with how a turbo-ed engine runs. Take that thing back and make them fix it. That's just not right! My wife's Forester is factory turbo with a 5 speed and does not do that! |
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Max Welton
Samba Member
Joined: May 19, 2003
Posts: 10697
Location: Black Forest, CO
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ps2375
Samba Member
Joined: April 24, 2014
Posts: 2471
Location: Meridian,ID
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| Posted: Mon Jan 29, 2018 9:28 pm Post subject: Re: Freevalve engines |
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| VW's that were DBW did this same thing too, partly due to dual mass FW (I think) and also tuning. Some of the flash tunes would eliminate the hang, I have read. |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 12714
Location: Western Canada
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| Posted: Mon Jan 29, 2018 10:03 pm Post subject: Re: Freevalve engines |
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| The VWs that did that were carbureted and VW added a dashpot to slow down the deceleration of the engine to keep it from going suddenly rich at high engine speed with the throttle closed. It was an emissions thing that made for poor drivability. I see no reason why a modern fuel injected engine should need to do this. I still think it's not supposed to be like that but get another opinion from someone in the Subaru know. |
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Max Welton
Samba Member
Joined: May 19, 2003
Posts: 10697
Location: Black Forest, CO
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modok
Samba Member
Joined: October 30, 2009
Posts: 26785
Location: Colorado Springs
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| Posted: Mon Jan 29, 2018 10:54 pm Post subject: Re: Freevalve engines |
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A brand new subaru.....that's problems we haven't even invented yet. Not going to speculate.
In the era when port injection was, fuel cut over 2500 when throttle closed, but the era is over, whole new can of worms.
Now throttles don't have cables, and ports don't have injectors.
Looking forward to when the electric superchargers hit the junkyards. |
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Max Welton
Samba Member
Joined: May 19, 2003
Posts: 10697
Location: Black Forest, CO
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FreeBug
Samba Member
Joined: March 12, 2012
Posts: 4278
Location: deepest, darkest Switzerland
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| Posted: Tue Jan 30, 2018 1:41 pm Post subject: Re: Freevalve engines |
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| modok wrote: |
A brand new subaru.....that's problems we haven't even invented yet. Not going to speculate.
In the era when port injection was, fuel cut over 2500 when throttle closed, but the era is over, whole new can of worms.
Now throttles don't have cables, and ports don't have injectors.
Looking forward to when the electric superchargers hit the junkyards. |
I'm seeing a lot of fuel cut off on deceleration going down to 1400-1250 rpm on Kia, Dacia and Suzuki, 96-2013 years... port injection, pretty "old" now, I think they're chasing M.P.G. |
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