Will a downpipe help with BP?

Shipmate · Aug 23, 2011

I am at sea level here in GA. I have the KEM 310 tune loaded up and I had a itch today after seeing Mikes burnouts and the others Burn out thread. I took my 11 year old son out to a abandon parking lot to show him about burn outs. Just like any good old dad would right! So we proceed to smoke the living crap out of the tires I slung it around a few times and he is just a giggling. Anyways I was looking at the Dash Daq and I was seeing EBP at 77.5 in red so I got off of it. I was less than half throttle went I saw it. I have a 4" downpipe back. If I was to put a downpipe on the truck will it reduce a little back pressure? I also still have the EGRs on the truck but soon they will be deleted.

Jeff@Spartan · Aug 23, 2011

You will need a wastegate to reduce back pressure.

Or a single turbo with a large exhaust housing.

Dzchey21 · Aug 23, 2011

no, the turbine on the turbos are the restriction not the exhaust system.

77 isnt that bad, at sea level thats only 63psi of back pressure, and if your near 50 lbs of boost thats not that bad of a ratio, i wouldnt worry about it honestly, if you were creeping to 85psi absolute back pressure i could see that starting to become a problem

Shipmate · Aug 23, 2011

Thank you for the quick answers.

Rmartin-97 · Aug 23, 2011

Not trying to hijack your thread but on an h&s mini mAx ebp is that drive pressure? Also do I subtract anything from that number.

Jeff@Spartan · Aug 23, 2011

Yes and no. I was helping a guy the other day and we realized his Black Maxx was reading back pressure without barometric pressure added in.

bigrpowr · Aug 23, 2011

08stroker250 said:
Yes and no. I was helping a guy the other day and we realized his Black Maxx was reading back pressure without barometric pressure added in.

thats great!! doing subtraction sucks!

Danbonzo · Aug 23, 2011

bigrpowr said:
thats great!! doing subtraction sucks!

LMAO LOL Tell me about it, by the time I get the numbers put in the calculator I have to let off the throttle and I then have to start all over again.