Erdin

Can someone pleas help me. i want to know what the best way is to measure exaust back presure. Do i just Connect a boost gauge to the mid pipe and take a reading at WOT, or is there more to it what sort of figures am I looking for.



Thanks in advance.



Erdin

BigTurbo74

not that elaborate. find a place to buy pressure senders and a guage. you could also use a pyrometer and look for heat differences.

Erdin

Its cool, I did some more research and found out that the less back pressure there is the better on a turboed car but it is worth saying that a little is good talking from experience, when I use my silencer on the back of my exhaust you can notice that there is more power to a certin point (lower Rev) but then it drops off but with out the silencer (less back pressure) the car is slower to respond but will pull a lot harder and

the power holds to a lot latter in the rev range. Hope that is of some help to any one else that was thinking about the same thing.

tancred

You want some backpressure in your turbo system otherwise you will end up with excessive creep and spiking, because your turbo will just throw out obscene amounts of boost, things like 15lbs on a stock turbo if you dont manage the back pressure.



I am running a 3" Downpipe, to a 3" Magnaflow Hi Flow Cat, to a 3" Single inlet, dual 2.5" Outlet Magnaflow hi-flow muffler to dual racingbeat mufflers, and that is keeping my boost under control. Provides for a good powerband, and with everything heat wrapped until after the muffler my turbo is loving it and keeping those things glowing helps you perform. The hotter a turbine gets the more efficient it will run...So keeping heatshields, using turbo blankets etc, will show some improvements, not only will it keep the rest of the engine bay cooler, but there are gains in keeping that sucker glowing...

1979rx7

about a 3 ich dow pipe to a 3 inch resonator to a 3 ich magna flow and twin 2.5 outlets ?

will tha be good or do i have to go to a 21/2 inch down pipe?

tancred

You should be fine with that setup. The Cat / resonator will keep the pressure. The thing is, sometimes depending on the maker the resonators will burn inside, because most are full of fiberglass and then they dont really do their job.

j200pruf

Less back pressure in a turbo exhaust the better. If you expience(sp) excessive creep or spiking, you need better flowing (IE bigger) waste gate.