Turbo car acceptable back pressure ?
#1
Turbo car acceptable back pressure ?
I have TT C5z06 with all supporting mods
now running 10 PSI and want to up the boost to 18-20 PSI
but i want to keep an eye on exhaust back pressure as my axel back is 2.5" ( all the pipes after turbos including x pipe are 3" )
I want to know what is the acceptable ratio between back pressure and boost
Thanks in advance
now running 10 PSI and want to up the boost to 18-20 PSI
but i want to keep an eye on exhaust back pressure as my axel back is 2.5" ( all the pipes after turbos including x pipe are 3" )
I want to know what is the acceptable ratio between back pressure and boost
Thanks in advance
#4
#5
8 Second Club
iTrader: (4)
There is no magic acceptable BP number. 1:1 or better may make the most power and choose the most radical cam. It also won't spool up near as fast. Most find a happy place int he middle.
With a twin setup you should have great BP ratios anyway. (I'd guess under 2:1) I wouldn't worry about it.
I ran as high as 2.8:1 at 25psi. The less overlap you have on the cam the better for high back pressure setups. What are your cam specs?
With a twin setup you should have great BP ratios anyway. (I'd guess under 2:1) I wouldn't worry about it.
I ran as high as 2.8:1 at 25psi. The less overlap you have on the cam the better for high back pressure setups. What are your cam specs?
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wisdom_23 (05-28-2020)
#7
8 Second Club
iTrader: (4)
Not really... If you have known high back pressure, neg overlaps cams tend to work better IMO. (like my setup) I doubt you have high back pressure. Since your setup is already together it doesn't really matter. Put a gauge on your setup and report back what you find.
TT setups generally have less back pressure than singles. (one of the reasons they tend to make more power) So you can usually go with a more radical/higher overlap cam. Depends what your looking for.
TT setups generally have less back pressure than singles. (one of the reasons they tend to make more power) So you can usually go with a more radical/higher overlap cam. Depends what your looking for.
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#10
TECH Senior Member
iTrader: (8)
Yes sir, shouldnt be an issue whatsoever. Lots of guys go over 2:1 but at that point there factors that cause it.
As forceded mentioned, a cam and downpipes have alot to do with this.
I know quite some ppl when they have these BP issues they throw in cutouts to relief the BP. Then again theres no point of a true dual system and running with cutouts open all the time soo thats when changing things around are a must if the BP is bad.
As forceded mentioned, a cam and downpipes have alot to do with this.
I know quite some ppl when they have these BP issues they throw in cutouts to relief the BP. Then again theres no point of a true dual system and running with cutouts open all the time soo thats when changing things around are a must if the BP is bad.
Last edited by Blackpanther99; 07-16-2014 at 12:41 PM.