MAF vs Speed Density w/no MAF
Nov 16, 2009, 05:36 PM
#20
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No a larger K&N was used. I believe it was 4" by 6" but I might be wrong about the length.
MAF was using a 4" induction off the turbo to a reducer to the MAF to a MAF sized filter. No MAF was 4" all the way to 4" filter.
I understand the need to question the results, and I am all for questioning. I just really think the MAF is not a restriction at this boost and power level. We might start seeing the advantage of MAF less with more boost on this turbo, but it won't happen currently on this Evo with stock headstuds and stock cams.
All is not lost however, the car drives great with the VTA Tial BOV and the idle is rock solid with no "clutch-in" dips, etc. I don't think I have ever seen a Evo lock on to target idle RPM so well before.
- Bryan
MAF was using a 4" induction off the turbo to a reducer to the MAF to a MAF sized filter. No MAF was 4" all the way to 4" filter.
I understand the need to question the results, and I am all for questioning. I just really think the MAF is not a restriction at this boost and power level. We might start seeing the advantage of MAF less with more boost on this turbo, but it won't happen currently on this Evo with stock headstuds and stock cams.
All is not lost however, the car drives great with the VTA Tial BOV and the idle is rock solid with no "clutch-in" dips, etc. I don't think I have ever seen a Evo lock on to target idle RPM so well before.
- Bryan
In any event thats an extremely useful thread with direct comparison of the before and after results!
Nov 16, 2009, 06:50 PM
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WOT is good, except for when you roll on it in 1st. When I'm going form a 10-15 mph roll, the car would begin to spool and th RPMs would climb fine. Before it hits full boost, the car would sputter a little bit and the SES light would flash indicating knock. This would only happen for about a second, then all hell would break loose =D.
As I shift into second gear and get back on the throttle, there would be a slight hesitation.
Would anybody know what's wrong? We were trying to figure this out for awhile last night and couldn't come up with anything =\.
I hope some one can chime in with a solution.
-Jesse
As I shift into second gear and get back on the throttle, there would be a slight hesitation.
Would anybody know what's wrong? We were trying to figure this out for awhile last night and couldn't come up with anything =\.
I hope some one can chime in with a solution.
-Jesse
Nov 16, 2009, 06:56 PM
#22
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As far as diveability, it's like day and night. Between shifts, while driving normal, is extremely smooth. A HUGE difference that I noticed is on the freeway. I can build boost for passing and SLOWLY let off the gas, and the car wouldn't buck at all!
Big plus for SD converion if you're running a VTA bov.
-Jesse
Big plus for SD converion if you're running a VTA bov.
-Jesse
Nov 17, 2009, 09:12 AM
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WOT is good, except for when you roll on it in 1st. When I'm going form a 10-15 mph roll, the car would begin to spool and th RPMs would climb fine. Before it hits full boost, the car would sputter a little bit and the SES light would flash indicating knock. This would only happen for about a second, then all hell would break loose =D.
As I shift into second gear and get back on the throttle, there would be a slight hesitation.
Would anybody know what's wrong? We were trying to figure this out for awhile last night and couldn't come up with anything =\.
I hope some one can chime in with a solution.
-Jesse
As I shift into second gear and get back on the throttle, there would be a slight hesitation.
Would anybody know what's wrong? We were trying to figure this out for awhile last night and couldn't come up with anything =\.
I hope some one can chime in with a solution.
-Jesse
Nov 17, 2009, 09:45 AM
#27
WOT is good, except for when you roll on it in 1st. When I'm going form a 10-15 mph roll, the car would begin to spool and th RPMs would climb fine. Before it hits full boost, the car would sputter a little bit and the SES light would flash indicating knock. This would only happen for about a second, then all hell would break loose =D.
As I shift into second gear and get back on the throttle, there would be a slight hesitation.
Would anybody know what's wrong? We were trying to figure this out for awhile last night and couldn't come up with anything =\.
I hope some one can chime in with a solution.
-Jesse
As I shift into second gear and get back on the throttle, there would be a slight hesitation.
Would anybody know what's wrong? We were trying to figure this out for awhile last night and couldn't come up with anything =\.
I hope some one can chime in with a solution.
-Jesse
Nov 17, 2009, 10:46 AM
#28
Does the sputter happen right around 4000 rpm when rolling on the throttle from cruising speeds into boost? Do you experience this when you go WOT at a low rpm?
I had this issue right around 4000rpm and was able to alleviate the sputter by adjusting RPM VE (higher in my case).
Feel free to post up your Map v Load tables or RPM v VE tables.
I had this issue right around 4000rpm and was able to alleviate the sputter by adjusting RPM VE (higher in my case).
Feel free to post up your Map v Load tables or RPM v VE tables.
Nov 17, 2009, 10:50 AM
#29
Just for data sake RyuEvoIX picked up 30whp on the red with the switch to speed density. from 560-590 on TTP dyno. likely around 500 on GST dyno. So I will stay with something else flirted with results here.
My own experience has shown larger turbos are more sensitive to freeing up airflow before the turbo. there are quite a few on here that have shown 50whp gains with switch from 3 to 4 inch intakes with large turbos.
My own experience has shown larger turbos are more sensitive to freeing up airflow before the turbo. there are quite a few on here that have shown 50whp gains with switch from 3 to 4 inch intakes with large turbos.
Last edited by 94AWDcoupe; Nov 17, 2009 at 10:52 AM.
Nov 17, 2009, 10:50 AM
#30
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Does the sputter happen right around 4000 rpm when rolling on the throttle from cruising speeds into boost? Do you experience this when you go WOT at a low rpm?
I had this issue right around 4000rpm and was able to alleviate the sputter by adjusting RPM VE (higher in my case).
Feel free to post up your Map v Load tables or RPM v VE tables.
I had this issue right around 4000rpm and was able to alleviate the sputter by adjusting RPM VE (higher in my case).
Feel free to post up your Map v Load tables or RPM v VE tables.
I played with the RPM VE table but I felt it wasn't helping enough
RPM VE is currently:
94
98
100
103
106
107
109
110
110
110
109
108
107
106
105
103
I'm thinking the asynch vs tpsdelta settings might need some tweaking as I haven't even touched those
- Bryan