boost overshoot going uphill
I'm getting boost overshoot when under high load, i.e. going up a hill. Is there any way to calm that down? I'm thinking removing the bottleneck in my exhaust might help...thoughts?
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I can't imagine I'm the only person experiencing this. Bueller?
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this is with Ebc?
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Yup, EBC.
Basically, I hit rock solid 9-10 psi on a flat road, and a fairly solid 12 psi going uphill, or any other time there is excessive load on the engine. |
There have been two other threads on this recently. Both determined that the 16G either doesn't like little exhausts and/or low boost pressure.
Your wastegate is probably experiencing too much backpressure from the exhaust to work efficiently. If the larger exhaust doesn't fully eliminate your issue the wastegate opening is possibly too small to bleed off the exhaust efficiently. It can be ported and a larger flapper installed. Not likely that this will be a problem after you open up your exhaust system. Someone else said that they had no problem with creep, but they had a lot higher boost setting and probably had other factors in their favor. |
crush bends ftl ;)
You need to update to the new MS ebc code for closed loop. :bigtu: Do you make less boost going downhill (less load)? It would seem to me that open loop bc is the problem. |
Where are you getting your wg signal from?
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No hills here in FL, sorry. :dunno:
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Originally Posted by m2cupcar
(Post 383559)
crush bends ftl ;)
You need to update to the new MS ebc code for closed loop. :bigtu: Do you make less boost going downhill (less load)? It would seem to me that open loop bc is the problem. they come out with it yet? ive hit a boost cut uphill once, i was in 4th and didnt feel like downshifting. the solution for me raising the boost cut :P |
Originally Posted by levnubhin
(Post 383568)
No hills here in FL, sorry. :dunno:
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Originally Posted by sixshooter
(Post 383555)
There have been two other threads on this recently. Both determined that the 16G either doesn't like little exhausts and/or low boost pressure.
Your wastegate is probably experiencing too much backpressure from the exhaust to work efficiently. Someone else said that they had no problem with creep... It's not creep per se, just hitting a higher boost and sticking there.
Originally Posted by m2cupcar
(Post 383559)
crush bends ftl ;)
You need to update to the new MS ebc code for closed loop. :bigtu: Do you make less boost going downhill (less load)? It would seem to me that open loop bc is the problem.
Originally Posted by Braineack
(Post 383574)
they come out with it yet?
Originally Posted by Braineack
(Post 383574)
ive hit a boost cut uphill once, i was in 4th and didnt feel like downshifting. the solution for me raising the boost cut :P
Funny that this didn't happen with my old IC... |
Originally Posted by sixshooter
(Post 383561)
Where are you getting your wg signal from?
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Originally Posted by Atlanta93LE
(Post 383582)
...Funny that this didn't happen with my old IC...
You've disturbed the balance. Raise the boost limit and where will it end? http://i158.photobucket.com/albums/t...ttacontrol.gif |
In another recent thread it was discussed that the hot side of the intercooler should never be the source for your wastegate signal or boost gauge lines. Disregard the factory outlet nipple. Use a source between the IC and the throttle body. Much more reliable signal. The hotside will give you strange behaviors.
I'll hunt for the posts. EDIT: Found one. Pay particular attention to Professor Joe Perez's dissertations as the thread progresses. https://www.miataturbo.net/forum/t32479/ |
Originally Posted by sixshooter
(Post 383579)
A hill is like a naturally occurring overpass with dirt filling underneath it. I saw one once as a kid.
:eek5: You lie! __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Originally Posted by m2cupcar
(Post 383559)
You need to update to the new MS ebc code for closed loop.
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Originally Posted by sixshooter
(Post 383608)
In another recent thread it was discussed that the hot side of the intercooler should never be the source for your wastegate signal or boost gauge lines. Disregard the factory outlet nipple. Use a source between the IC and the throttle body. Much more reliable signal. The hotside will give you strange behaviors.
I'll hunt for the posts. EDIT: Found one. Pay particular attention to Professor Joe Perez's dissertations as the thread progresses. https://www.miataturbo.net/forum/t32479/ |
Originally Posted by m2cupcar
(Post 383559)
You need to update to the new MS ebc code for closed loop. :bigtu:
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Whoa - sorry guys - I was just BS'ing. :gtfo: I do have some working closed loop code. Though it's over ten years old... and in my LINK. ;)
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Originally Posted by m2cupcar
(Post 383714)
Whoa - sorry guys - I was just BS'ing. :gtfo: I do have some working closed loop code. Though it's over ten years old... and in my LINK. ;)
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