Since its a twin turbo and no actuation is required does it still require a back pressure to open up something... I always thought that a FD might need it for some reason...

 

nope

 

Backpressure helps control boost with a stock/un-ported wastegate. However, if you have an aftermarket or ported wastegate, then backpressure really isn't an issue.

 

No back pressure == faster than dirt , or faster than the speed of water . Second gen 6 port motor needs alittle to open the ports when stock .

 

as long as you can control boost, the turbos should give you plenty of back pressure

 

yep, no backpressure is required!

 

back pressure is the enemy

 

in an automatic fd is important backpressure???
i think is good for better boost response or lag???
thanks

 

Less backpressure= less low and midrange but more high end power.

 

on an NA motor

on a *typical* turbo motor, you are going to see less low end, but improved turbo response, improved mid, and improved high end power.

 

Stick your finger up your butt. Like it? Neither does the FD.

 

http://www.efini.net/tqcomparo.htm

 

what happens if I like it??? Oh...Did I just type that out loud????

 

Then you are a SICK person

 

look at this link. It shows some info on backpressure and it's relationship to hp and torque.

http://www.efini.net/tqcomparo.htm

 

Then I have a couple of questions:
-How much work is it to remove the WG and have it ported?
-Is it possible to buy a lager wastegate for the stock turbos? One that just bolts on in without major modifications?

 

wael had ign problems with that midpipe run, between transition and 6k rpm.

better to compare the hi-flo cat run to his old dyno run, with midpipe and no misfire.

 

did he? i notice that little extra hump in the graph but the hi flo cat run had that too. i was there when he did it and he didn't mention anything then. what kind of problems?

 

The graphs were discussed extensively on the 'big list' when he 1st posted them .... mid pipe = no torque, bla, bla.... Having seen many dyno sheets for mid pipes, I posted that his mid-pipe run was not typical, and obviously had an engine problem between transition and 6k. Don't recall exactly, but he acknowleded either a plug or ignition problem had occured there.

just look at the "333 ft-lb" link on that page, for what a midpipe run should look like.