yeah, 2:1 is pretty good, but 3:1 is pretty high.

R

 

It shouldn't matter where the back pressure sensor is.....
Mine will be done today, althou my truck wont be ready for a few days.....

 

What is the back
pressure of a
Synergy twin kit?

 

To be honest, never tested it on my truck. I prefer to just work with it and you can see by power, boost levels and other things how the pressure is being affected. I dropped it big time from the last setup. I never had boost creep on the old manifolds, now I have a good amount of it. Which is a result of too good an exhaust. If you are trying to solve a problem with the system, then I can see why you would want to do it. You will see when you do yours on you STS kit, and how fast you will rip it off the truck after that. hehe

R

 

sounds like you need a bigger waste gate to me....

 

This whole boost to back pressure talk helps me understand why blowers can run alittle tighter lobe sep.I wouldn't want that much back pressure to even come close to trying to re-enter the cylinder.
If someone could add more please do.

 

if you just want to log it from time to time you can weld a o2 sensor bung in the exhaust before or aft cat,turbo, muffler... wherever you want to measure pressure. you will need a back pressure test adaptor avalable from most tool truck i got min from snap on for 30 bucks. its basicly a 5/16 nipple on a bung with 14mm threads(o2 size) it also cam with one high tem orange silcaon hose 24". then you can run the hose with an extension into the vehicle to a boost gauge of old style carberator fuel test gauge. this is not perminant though. it is useful for testing. i also use it for testing pressure drop accross intercoolers at diffent boost levals to test eficiancy.

 

I know that captain obvious.

I was simply pointing out the other methods for testing pressure. IF you have two setups, both same sized turbos, exhaust housings, ect. The only changes are the headers, and external gates, which are bigger than internal gates, and the old setup was dropping boost up top and the new is climbing, then you can see the efficentcy difference.

No way in hell am I going to spring 800 for two new gates. Yuck.

R

 

Some people have a 4th sense about these things, I think Rick has made some very good points in this thread. I work with hot/cold air and liquids every day, so visualizing the flow, volume, pressure drops, and turbulent spots are second nature to me. Its awesome once it "clicks" - although, kind of odd when trying to explain it to someone else.

Corky Bells book is a good one, I highly recommend it. There are a few others that are geared more toward industrial applications that IMO are also worth the price, I'll see if i can hunt them down.

 

That's funny you say people don't get it I work in hvac and try all the time to get people to understand that air is a substance that has mass.