cosworth plenum spacers any gains on using one
20-03-2006, 09:31 PM
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cosworth plenum spacers any gains on using one
the plenum spacers that gets put on cossy are they worth it do you gain any thing or is it for show 
any one put it under any test for results
any one put it under any test for results
20-03-2006, 09:52 PM
#7
A good alternative IMHO is the Zoo / A1 Rally Sport/ Mike Rainbird Swedish style plenums - that get rid of the restrictive inlet elbow of the standard plenums.
I sold one on ebay the other day and have another to go up soon.
Doug Stirling's car runs 564 bhp using the Stainless one my friend made, so seem to work okay.
Although saying that AFAIK Rod's car doesn't use a Swedish plenum, and that also runs / ran ok!
Simon
I sold one on ebay the other day and have another to go up soon.
Doug Stirling's car runs 564 bhp using the Stainless one my friend made, so seem to work okay.
Although saying that AFAIK Rod's car doesn't use a Swedish plenum, and that also runs / ran ok!
Simon
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20-03-2006, 09:53 PM
#8
Originally Posted by abdr500
what about if your not running 600 bhp would ther be any gain
20-03-2006, 10:42 PM
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...its the distance between trumpet and cover
Thats right - the inlet trumpets are ridiculously close to the cover! Considering the cost of 10mm spacers I don't think you can go far wrong with them.
As mentioned the Swedish style plenums are a good alternative but don't really see the point unless you're going for big(ish) HP when you compare the two options pound for pound.
21-03-2006, 04:54 AM
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Originally Posted by Genesis Engineering
...its the distance between trumpet and cover
As mentioned the Swedish style plenums are a good alternative but don't really see the point unless you're going for big(ish) HP when you compare the two options pound for pound.
21-03-2006, 05:21 AM
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think thomas have done some testing on the manifolds.think he said it was 4-6% difference between the worst and best cylinder.
it was about the same as a MIS inlet iirc
it was about the same as a MIS inlet iirc
21-03-2006, 06:10 AM
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Originally Posted by capri-rs
think thomas have done some testing on the manifolds.think he said it was 4-6% difference between the worst and best cylinder.
it was about the same as a MIS inlet iirc
it was about the same as a MIS inlet iirc
21-03-2006, 08:05 AM
#14
We have flow tested the Swedish items 
. : http://www.randbmotorsport.co.uk/sho...sp?ProductID=5
These particular ones have been subjected to extensive engine dyno research. Obviously I cannot vouch for any other items.
. : http://www.randbmotorsport.co.uk/sho...sp?ProductID=5These particular ones have been subjected to extensive engine dyno research. Obviously I cannot vouch for any other items
.
21-03-2006, 08:59 AM
#17
Originally Posted by bud-weis
the swedish ones are a bit overkill though aren't they?? (for 90% of cossies)
and from what i've seen throttle response is shite on them
and from what i've seen throttle response is shite on them
. I can't understand people's obsession with buying things they DON'T need .
21-03-2006, 09:02 AM
#18
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Originally Posted by bud-weis
the swedish ones are a bit overkill though aren't they?? (for 90% of cossies)
and from what i've seen throttle response is shite on them
and from what i've seen throttle response is shite on them
21-03-2006, 09:11 AM
#19
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Originally Posted by Mike Rainbird
I can't understand people's obsession with buying things they DON'T need .
.
21-03-2006, 09:14 AM
#20
Norris Motorsport
Gareth, throttle response is not the same as TFC mapping.
Throttle respsonse refers to the time from throttle opening to engine response, and allthough correct TFC mapping is vital for smooth operation, it cannot change the laws of physics. (i.e. huge plenum volumes)
Throttle respsonse refers to the time from throttle opening to engine response, and allthough correct TFC mapping is vital for smooth operation, it cannot change the laws of physics. (i.e. huge plenum volumes)
21-03-2006, 09:21 AM
#21
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Originally Posted by Karl
Gareth, throttle response is not the same as TFC mapping.
Throttle respsonse refers to the time from throttle opening to engine response, and allthough correct TFC mapping is vital for smooth operation, it cannot change the laws of physics. (i.e. huge plenum volumes)
Throttle respsonse refers to the time from throttle opening to engine response, and allthough correct TFC mapping is vital for smooth operation, it cannot change the laws of physics. (i.e. huge plenum volumes)
21-03-2006, 09:29 AM
#22
Norris Motorsport
Hi Gareth,
Indeed I agree, fitting a larger plenum without remapping the TFC is a recipe for flat spots and hesitation!!
However even when mapped correctly there is a noticeable suggish response in the engine when fitted with large volume plenums, especially when pressing the throttle from idle conditions when the engine VE is at its lowest and the plenum volume at its relative largest compared to engine air consumption.
Indeed I agree, fitting a larger plenum without remapping the TFC is a recipe for flat spots and hesitation!!
However even when mapped correctly there is a noticeable suggish response in the engine when fitted with large volume plenums, especially when pressing the throttle from idle conditions when the engine VE is at its lowest and the plenum volume at its relative largest compared to engine air consumption.
21-03-2006, 09:35 AM
#23
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ahh thanks karl
would you class a swedish style plenum large in volume? i havent measured one, but they dont look like they have a massive volume
would you class a swedish style plenum large in volume? i havent measured one, but they dont look like they have a massive volume
21-03-2006, 09:48 AM
#24
Originally Posted by RS500/104
Originally Posted by Mike Rainbird
I can't understand people's obsession with buying things they DON'T need .
..
21-03-2006, 10:50 AM
#27
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Its kinda a T4 but not like that on yours LOL - its much better
Yeah as noble's stated i have 9bhp more than the saff at the wheels and going on RW's rst and nobles RR i reckon ure well down the line - 420ATW i reckon on AVA's
Yeah as noble's stated i have 9bhp more than the saff at the wheels and going on RW's rst and nobles RR i reckon ure well down the line - 420ATW i reckon on AVA's
21-03-2006, 10:55 AM
#28
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Originally Posted by Mike Rainbird
Originally Posted by bud-weis
the swedish ones are a bit overkill though aren't they?? (for 90% of cossies)
and from what i've seen throttle response is shite on them
and from what i've seen throttle response is shite on them
. I can't understand people's obsession with buying things they DON'T need .Mike have you connected up the water supply on your front brakes yet
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