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MAF vs Speed Density w/no MAF

 
Old Nov 16, 2009, 01:51 PM
  #16  
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Originally Posted by dmoevo View Post
My driveability improved incredibly, I have Tial Q and Kelfod 272's idles rock solid and AFRs are perfect. I think one benefit was quicker spool but its hard to tell especially since im on stock turbo e85 and I struggle to stay out of boost just cruising.
How do you like that Tial Q? Thing is huge!
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Old Nov 16, 2009, 01:59 PM
  #17  
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Its a great BOV once you buy it you wont have purchase any other one, just make sure you get the right spring based on your vacuum at idle.
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Old Nov 16, 2009, 02:32 PM
  #18  
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Originally Posted by scheides View Post
I'm not on SD, but I'm running Tephra v7t5 or t6 96530706.
OK I wasnt sure if you had converted. I too am running a MAF. But when I changed the id my car would want to stall.
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Old Nov 16, 2009, 02:42 PM
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First post updated with boost plot overlay

- Bryan
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Old Nov 16, 2009, 05:36 PM
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Originally Posted by GST Motorsports View Post
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
I am not questioning the results, but i was really surprised since on AEM setups other shops have seen gains by using a larger diameter turbo inlet pipe!

In any event thats an extremely useful thread with direct comparison of the before and after results!
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Old Nov 16, 2009, 06:50 PM
  #21  
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Originally Posted by Chris Moore View Post
How does the car drive out of WOT?
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
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Old Nov 16, 2009, 06:56 PM
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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
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Old Nov 16, 2009, 07:15 PM
  #23  
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Nice. Great job again Bryan.
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Old Nov 16, 2009, 07:32 PM
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Good test bryan. Sounds like at that power level the MAF isn't yet a restriction. Good work.
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Old Nov 17, 2009, 09:12 AM
  #25  
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Originally Posted by jessmanEVO View Post
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
Bump for someones help =\
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Old Nov 17, 2009, 09:26 AM
  #26  
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Originally Posted by jessmanEVO View Post
Bump for someones help =\
I don't want to step on anyone's toes but have you by chance asked Sean what he thought about it?

Good luck figuring out what the issue is
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Old Nov 17, 2009, 09:45 AM
  #27  
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Originally Posted by jessmanEVO View Post
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
Might want to try to play with the asynch vs tpsdelta settings. SD needs more asynch fuel than a maf based tune does to eliminate that brief lean spike when getting on the throttle.
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Old Nov 17, 2009, 10:46 AM
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Originally Posted by jessmanEVO View Post
Bump for someones help =\
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.
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Old Nov 17, 2009, 10:50 AM
  #29  
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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.

Last edited by 94AWDcoupe; Nov 17, 2009 at 10:52 AM.
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Old Nov 17, 2009, 10:50 AM
  #30  
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Originally Posted by Creamo3 View Post
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.
Happens right at WOT and when getting on the gas between WOT gears.

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
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