FAO Porkie/Reyland
#1
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...i was told by a mate your cars were suffering surge at Brands Hatch....is this too much boost being used to extract max power???...I ran 2bar on a GT35 and no surge...but my T4 did but Steve Scott said my ports were too small...LOL...do you run ported shrouds to help surge?
..not a dig a genuine question if you can be mature for once..if my mate heard it everyone did.
ps yes i do have 1 mate ROFL
..not a dig a genuine question if you can be mature for once..if my mate heard it everyone did.
ps yes i do have 1 mate ROFL
#2
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..hope i get a reply as its not good to be ignored..people want to know the reasons...we need to stick together in beating the japs...lots of heads is better than one.
#6
DEYTUKURJERBS
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Ive been at all the other Time Attack rounds and have driven the Sierra quite a lot, and ive never noticed it suffering from surge, so would be suprised if it was at Brands?
Never really been a problem since it had the bigger exhaust housing ages ago IIRC.
Never really been a problem since it had the bigger exhaust housing ages ago IIRC.
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#12
DEYTUKURJERBS
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Well TBH thats what I shouldve said.
If being driven hard id be shocked if the car ever goes anywhere near where it surges at all, which is as Chip said.
The car is at its fastest from about 6k+ to be honest, and I doubt it goes much under that when being driven in Time Attack mode etc.
If being driven hard id be shocked if the car ever goes anywhere near where it surges at all, which is as Chip said.
The car is at its fastest from about 6k+ to be honest, and I doubt it goes much under that when being driven in Time Attack mode etc.
#13
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Originally Posted by Chip-3Door
The sierra surges, it did it when porkie took me out in it at coombe.
Only at about 4K though, not above it, and only on the highest boost setting, so its very easy to avoid by keeping the revs up or dropping the boost a touch.
Only at about 4K though, not above it, and only on the highest boost setting, so its very easy to avoid by keeping the revs up or dropping the boost a touch.
...can anything be done about it?...i know the head would be ported enuff?
#14
*** Sierra RS Custard ***
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Well surge is just the turbo trying to flow more air than the engine can swallow, so you either make the turbo flow less or you make the engine swallow more, or you give the gas an escape route with a ported shroud.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
#15
DEYTUKURJERBS
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Its a viscous circle really, if the head can flow more it will lose low down power and raise the boost threshold, but if you dont you get surge and lose it low down anyhow ![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
Fookin cars
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
Fookin cars
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
#17
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Originally Posted by Chip-3Door
Well surge is just the turbo trying to flow more air than the engine can swallow, so you either make the turbo flow less or you make the engine swallow more, or you give the gas an escape route with a ported shroud.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
![Big Grin](https://passionford.com/forum/images/smilies/icon_biggrin.gif)
I could tell you how to avoid it without capping the boost but where would the fun be in that
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Mark
#22
*** Sierra RS Custard ***
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Originally Posted by Mark Shead
Originally Posted by Chip-3Door
Well surge is just the turbo trying to flow more air than the engine can swallow, so you either make the turbo flow less or you make the engine swallow more, or you give the gas an escape route with a ported shroud.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
![Big Grin](https://passionford.com/forum/images/smilies/icon_biggrin.gif)
I could tell you how to avoid it without capping the boost but where would the fun be in that
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Mark
Oh you tease
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
You refering to cam timing?
More CC will move surge down the rev range typically.
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I'm not expert but changing the standard exhaust manifold on the Sierra would be a great help in reducing or stopping the surge in my view and if the GT35 was staying on I would do just that. But I just don't like the Turbo really. With the 5 speed box I feel the car needs a punchier Turbo so I already have a new GT30 ready and waiting to be fitted. Car will make less power but should be alot quicker on track in my view.
#25
Happily retired
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Originally Posted by Stavros
Ive been at all the other Time Attack rounds and have driven the Sierra quite a lot, and ive never noticed it suffering from surge, so would be suprised if it was at Brands?
Never really been a problem since it had the bigger exhaust housing ages ago IIRC.
Never really been a problem since it had the bigger exhaust housing ages ago IIRC.
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Originally Posted by Rick
Was surging like mad at Nat day, i was going to ask why, but forgot about it.
It was because the track was FUCKING slippery... and there was a big fucking wall. So I had to keep the revs down a bit to stop me crashing.... below 4.5k revs the Turbo does surge its tits off.... but above 6k revs my ASS was surging it tits off
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#29
*** Sierra RS Custard ***
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Originally Posted by Porkie
I'm not expert but changing the standard exhaust manifold on the Sierra would be a great help in reducing or stopping the surge in my view and if the GT35 was staying on I would do just that. But I just don't like the Turbo really. With the 5 speed box I feel the car needs a punchier Turbo so I already have a new GT30 ready and waiting to be fitted. Car will make less power but should be alot quicker on track in my view.
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#31
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Originally Posted by Mark B
could someone explain surge in a easy non complicated way?
#32
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Originally Posted by NORTH YORKS RS SPARES
It sounds like your vacume cleaner is full but you only have a bit left to do and you cant be arsed to empty it
you can hear it trying but you know its just to full ![Top](https://passionford.com/forum/images/smilies/smile011.gif)
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#33
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Originally Posted by Andreas
Originally Posted by Mark B
could someone explain surge in a easy non complicated way?
Thanks
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#34
PassionFord Post Whore!!
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Originally Posted by Chip-3Door
Originally Posted by Mark Shead
Originally Posted by Chip-3Door
Well surge is just the turbo trying to flow more air than the engine can swallow, so you either make the turbo flow less or you make the engine swallow more, or you give the gas an escape route with a ported shroud.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
![Big Grin](https://passionford.com/forum/images/smilies/icon_biggrin.gif)
I could tell you how to avoid it without capping the boost but where would the fun be in that
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Mark
Oh you tease
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
You refering to cam timing?
More CC will move surge down the rev range typically.
Porkie the exhaust manifold has very little to do with it.
Mark
#35
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Originally Posted by Mark Shead
Originally Posted by Chip-3Door
Originally Posted by Mark Shead
Originally Posted by Chip-3Door
Well surge is just the turbo trying to flow more air than the engine can swallow, so you either make the turbo flow less or you make the engine swallow more, or you give the gas an escape route with a ported shroud.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
![Big Grin](https://passionford.com/forum/images/smilies/icon_biggrin.gif)
I could tell you how to avoid it without capping the boost but where would the fun be in that
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Mark
Oh you tease
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
You refering to cam timing?
More CC will move surge down the rev range typically.
Porkie the exhaust manifold has very little to do with it.
Mark
#37
PassionFord Post Troll
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Originally Posted by Bosch_Dealer
..no reply just means there is a problem...we can all help.
Lets sort the YB out..we can beat it
Lets sort the YB out..we can beat it
#38
PassionFord Post Whore!!
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Originally Posted by EsCosRacer
Originally Posted by Mark Shead
Originally Posted by Chip-3Door
Originally Posted by Mark Shead
Originally Posted by Chip-3Door
Well surge is just the turbo trying to flow more air than the engine can swallow, so you either make the turbo flow less or you make the engine swallow more, or you give the gas an escape route with a ported shroud.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
Easiest way to fix it on porkies car without losing any of the performance (in fact you would gain some) would be to increase the capacity.
Yours didnt surge I suspect purely cause you never ran enough boost in the midrange to make it do so.
![Big Grin](https://passionford.com/forum/images/smilies/icon_biggrin.gif)
I could tell you how to avoid it without capping the boost but where would the fun be in that
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
Mark
Oh you tease
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
You refering to cam timing?
More CC will move surge down the rev range typically.
Porkie the exhaust manifold has very little to do with it.
Mark
A problem shared is a problem halved very true but every bit of knowledge surely has some commercial value
Mike
#39
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Originally Posted by Andreas
Originally Posted by Mark B
could someone explain surge in a easy non complicated way?
Excuse my lack of knowledge about surge
![Red Faced](https://passionford.com/forum/images/smilies/icon_redface.gif)
![Red Faced](https://passionford.com/forum/images/smilies/icon_redface.gif)
So how dangerous to the engine is it if left untreated so to speak...
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