Interesting discussion on "millerizing" a turbo setup
|
cliffs:
mazda millernia miller cycle uses a supercharger to do the hard compression work and leaves intake valves open during the first part of the compression stroke when the crank has no leverage on the rod/piston. same ish could be done on a turbo, but not quite so much at light throttle where there's no boosts. super doesn't have to wait for exh gas to do its job. big question: can you set up the VVT to close the intake valve so late that you gain efficiency with a turbo? |
Damn I miss Pat
|
Originally Posted by y8s
(Post 439385)
same ish could be done on a turbo, but not quite so much at light throttle where there's no boosts. super doesn't have to wait for exh gas to do its job.
|
Cool thread, thanks for the link.
|
Originally Posted by JasonC SBB
(Post 439823)
Light throttle means vacuum in intake mani. No need for boostin'.
|
That was very interesting
|
Originally Posted by y8s
(Post 439905)
intake valve open late means air pushin' back into the intake and less vacuum
|
Originally Posted by 18psi
(Post 439388)
damn i miss pat
|
yes, but basically having that retarded closing intake valve it would mean less probability to knock but A LOT of torque/power loss until the turbo will be able to fully spool, right?
|
Originally Posted by 18psi
(Post 439388)
Damn I miss Pat
Originally Posted by naarleven
(Post 440276)
+1
|
So the 99/00 intake cam has the same duration and lift / ramps as the '01+?
If so how retarded is the 01 in full retard compared to the 99/00? |
you'd have to degree both and compare I guess.
|
Why does the stock 01' need to move its intake cam around to match the 99 torque curve? Lack of VICS?
|
Originally Posted by JasonC SBB
(Post 441631)
Why does the stock 01' need to move its intake cam around to match the 99 torque curve? Lack of VICS?
|
Originally Posted by y8s
(Post 441701)
does it? do you ahve a stock 99 dyno plot?
|
From FM:
VICS on a 99. Here's our '99 with 600 miles on stock engine, FM single n/a exhaust. If you look at the chart, Run 29 is with hose disconnected and plugged for the VICS actuator. Major drop in midrange torque. Run 30 is with VICS hooked up normally. Run 31 is with VICS locked in the low rpm position, you can see that peak hp is the same, but hp plummets after about 6k rpm. http://flyinmiata.com/tech/dyno_runs/99_050400.pdf VVT on a 2003 Run 4 is VVT unplugged http://flyinmiata.com/tech/dyno_runs...sconnected.pdf 99 vs 2001 2001 is Run 3 http://flyinmiata.com/tech/dyno_runs...ell_112700.pdf |
All times are GMT -4. The time now is 09:43 PM. |
© 2024 MH Sub I, LLC dba Internet Brands