This is a discussion on What is the next easy step to get another 40-50rwhp within the F150 Ecoboost Performance forums, part of the F150 Ecoboost Garage category; Originally Posted by 2016BoostedGreyGoose I have no idea what my truck will be making...but here is what ive got so far....GT Turbos, CR big bore ...
My build thread
do downpipes really make that much difference? if so, how? its just a pipe
2017 2.7L Bronze Fire 4x4 3.55 145" | Gearhead Tune | UPR DVCC + CSS | Ford Performance Super 8.8" LSD | Hellwig front/rear sway-bar | 12Volt Solutions Remote Starter | Ford Tri-fold tonneau cover | Line X bed liner | Huskey front/rear mud guards & rear wheel well liners | AVS Aeroskin hood shield | Rear block removed
Of course, this all depends on whether the downpipes and exhaust is a restriction.
Last edited by mass-hole; 02-01-2019 at 03:18 PM.
2014 Lariat Screw, 157", Max Tow, 502A - Gearhead Tuned, AFE Intercooler, RX Catch Can, Bilstein 5100(.8" level), AirLift RideControl bags, 275/60R20 Wrangler Duratracs
2006 Jeep Liberty CRD(diesel) - GDE Tune, Straight piped, AFE filter, 2.5" Lift, ARB bumper
QUOTE="Tune+, post: 1306001, member: 19118"]Actually the car is not blind to reduced back pressure as EGBP(psi) is part of the factory calculations for load, speed density quadratic tables, OE BPV control strategies. It is all inferred as the car does not actually have a way to measure true exhaust backpressure. It uses multiple readings to get a somewhat accurate EGBP measurement. So when you change the downpipe it alters the parameters being read by the ECU and it will automatically try to compensate for it. If the range of EGBP changes there are multipliers in both directions to make the changes.
So the loss of torque "feel" on the factory tune; 1. The factory tune uses the throttle blade angle (ETC) to control TIP/Load, when you install a catless or higher flowing downpipe you increase TIP and LOAD so the ECU has to compensate even more to keep everything in check. How it compensates is by reducing ETC Angle to block out boost and lower load. 2. Turbine Speed is lower initially, but overspeed is possible as long as the throttle is 100% open, if the throttle is not 100% open the charge pressure is always going to be forcing the turbo to slow down as the charge it is producing is not moving with intended velocity. With the factory tune, it is more #1 than #2 but both are possible.[/QUOTE]Another thing about the aftermarket downpipes I see, is that they all seem to use the same size pipe to connect to the turbos as stock, then expand as they get to the catalytic converter if there is one, so basically isn't that the same thing as the 2.5" bottle neck in the factory resonator. Look at the connection at the turbo flange on this picture belowOriginally Posted by Bugasu, post: 1306280, member: 23272
That all sounds a lot like what @Boostking was telling us about how the programming handles turbo upgrades in his oem+ thread. I've been very much so on the fence regarding the merits of bolt on upgrades. I want to know what my intended bolt ons can do *with tuning*, and would like them to behave well on the stock tune if I ever find myself needing to run it.
Was that posted by Adam at Tune+?
Im interested in this too because I am debating on a set of downpipes here soon as well.
2013 FX4 - Black Betty