Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
New showcase items
New showcase comments
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Showcase
New items
New comments
Latest content
Latest reviews
Latest updates
Search showcase
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Power Strokes
7.3 Aftermarket
Boost/Drive Pressure numbers with 74+mm turbo's
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
[QUOTE="Charles, post: 25810, member: 103"] It used to make no sense to me that opening up the gate around the 38R and letting the 47 work harder produced [i]worse[/i] boost:drive ratios. I thought maybe all the devious plumbing angles I was forced to use in routing that gate was causing a lot of drag or something. Even though I still didn't quite buy it. I never dreamed that 88mm charger with a 1.32 turbine housing would have been the problem. But after talking to some guys in the gasser world I realized the turbine in the 47 becomes a bottleneck in big displacement applications. And with a second stage charger pumping up the dispalcement, that's exactly what was happening, which is why I decided to up the first stage and leave the 38R with the gate alone. In fact, If you look at it by the numbers, I picked up exactly 89.5rwhp, best gain at 3000rpm. Which is obvioiusly crap, because it should have picked up a bunch on the top, but with the crap my truck is pulling lately it just can't make anything up top, yet that big ass charger still picked up right at 90 wheel at 3000 rpm, where it was barely loafing. And that was starting at a dismally low 538.49rwhp, and pulling it all the way up to 628. In terms of percentage gain, that represents 16.6%. Assuming I had swapped to the 55 back when my truck still worked, and I pulled 644 on the 47 with the 300% nozzles, that same gain would have put me at 751rwhp. Point being..... something like this 55 under the hood of a truck that [i]actually works[/i]... would make some hellacious power for a Heui 7.3 on fuel. These 400's, by the numbers should make 689 on fuel on my old setup, when my truck used to work, and Brian proved it by pulling 687 IIRC on dunbars running them. You slap that 55 on that, and you might be looking at 803rwhp on fuel.... again, [i]by the numbers[/i]. Needless to say, it's killing me to have to see such potential being squandered by some bs problem that keeps plaguing my truck, and I would [i]love[/i] to see some of you guys running similar setups on some of these engines that actually function properly in all other areas. [/QUOTE]
Insert quotes…
Verification
Post reply
Random media
Latest posts
Tuning 101 - Thread Merged with Injector Posts
Latest: Powerstroke Cowboy
Yesterday at 8:39 AM
7.3 Aftermarket
Best aftermarket stock-ish headlights?
Latest: Powerstroke Cowboy
Monday at 7:34 PM
94-97 Aftermarket
T
2023 f350 6.7L
Latest: t.rider.013
Friday at 4:13 PM
6.7 Tech
B-Code VOP
Latest: Powerstroke Cowboy
Thursday at 9:15 AM
7.3 Aftermarket
9
20% TO 40% OFF ON FORD OEM PARTS
Latest: 99fordman18
May 15, 2024
Sunrise Ford Parts
Members online
Patrick Feeley
fastersteve
lincolnlocker
Forums
Power Strokes
7.3 Aftermarket
Boost/Drive Pressure numbers with 74+mm turbo's
Top