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#1
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Target AFR
Anyone have any suggestions for optimum target AFR for tuning a turbocharged SVX? I'm running water injection above atmospheric pressure, so I doubt I will need enormous amounts of fuel on boost for cooling, but I will have to richen. I've been looking at LAN's numbers but don't want to run 10:1 as a starting point. Any input would be appreciated. I will be looking at the entire fuel curve up top and down low.
Thanks Chuck D.
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#2
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12.3-5:1 @ 8ish lbs would be nice. Im running 12:1across omst of the band and it is happy. Lan runs 12.5-13.0:1 AFR
phil
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~Phil Teal 1992 Subaru SVX Turbo - Sold in May 2011 to peace-frog. |
#3
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I'm with Phil...the EG33 really, really doesn't like running too rich. 12.5 to 13:1 seems to be the sweet spot.
-Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#4
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More on AFR
Quote:
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#5
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Quote:
I'd recommend that range for an n/a or even s/c SVX. Turbocharged motors like to run a bit richer and I'd recommend something in the 11.5-12.3:1 range. Phil, I think LAN's Stage 3 set-up runs richer than 12.5:1 in the upper rpms. He's running a lot of timing advance with boost, and actually think it's somewhere in the 11/10:1 range.
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) Last edited by Chiketkd; 06-15-2006 at 09:41 AM. |
#6
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Quote:
Looking at all of the SVX dyno curves to date, I believe the EG33 actually loses power when it sees AFR in the 11/10:1 range - regardless of whether it's na or s/c. Check out the curve from Tom J's old car when whoever tuned it with the APEX -- I don't believe it ever dropped below 12:1 even in the upper rpms and it cranked out almost 200 Hp at the wheels. -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#7
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Quote:
__________________
"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#8
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Afr
I think you are both right, in that the AFR is much higher than the LAN numbers of 10:1, but don't forget, LAN did this for his high boost curves of 12 psi. I don't think he ran this at lower boost.
I fully expect to have to play with these numbers. I'm just trying to see what successes are out their for different boost levels and different ratios. If someone is running as low as 13.5:1 for an NA SVX then I need to bump up my ratios at that point on the curve. For boost I would really like to see what LAN was doing. It might save me a lot of hunting legwork. Thanks for the input guys.
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
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