My large frame front mount project with two videos
04-17-2009, 03:47 PM
#341
TECH Apprentice
iTrader: (7)
Join Date: Jul 2006
Location: Reno,NV
Posts: 344
Likes: 0
Received 0 Likes
on
0 Posts
Speaking of back pressure, what are you seeing? I was wondering what was going on with the truck, good to see some more progress. Is that a scotchlock I see on the injector pigtail?
04-18-2009, 12:57 AM
#342
How do I change this text
Thread Starter
iTrader: (26)
Join Date: Jan 2005
Location: Behind the TIG welder
Posts: 7,294
Likes: 0
Received 2 Likes
on
2 Posts
I finally was able to log back pressure. the results of the log shows where all the new found power is coming from...
Just a quick run down...
EBP readings with the STS GT-67 .96a/r
Low boost (6 psi)~15-28psi
High boost (10psi)~28 psi
If I roll into it the boost slow, back pressure would be around 20psi
So with the sts I was seeing a 3:1 pressure ratio
EBP readings with custom front mount s475 1.32a/r
Low boost (6psi)~8psi of back pressure
High boost no results yet, although looking threw my logs I show a peak boost creap at almost 10psi and a peak EBP at 14psi.
I can hardly believe the numbers, but 6psi of front mount feels like 12psi of STS.....
I will post a log up tomorrow if anyone is interested..
04-18-2009, 03:48 AM
#344
Wow, I never thought the numbers would be that LOW...ever. Everything I've read hint's at 3:1 or 4:1 on most systems and 2:1 on good systems. This is great info! Thanks, 
Newbs are gonna see that and go ballistic!
You should put a disclaimer on it! 
Newbs are gonna see that and go ballistic!
You should put a disclaimer on it!
04-18-2009, 09:16 PM
#346
14 Second Truck Club
Join Date: Jan 2004
Location: Keller, TX
Posts: 1,429
Likes: 0
Received 0 Likes
on
0 Posts
Thanks I'm not sure if those screen shots are clear... It basically shows the traction (lack there of) at 80 mph...
A video....
S475 front mount Video
A video....
S475 front mount Video
04-18-2009, 09:19 PM
#347
13 Second Truck Club
iTrader: (13)
Join Date: Mar 2008
Location: Arlington (DFW), Texas
Posts: 2,663
Likes: 0
Received 0 Likes
on
0 Posts
04-19-2009, 02:59 AM
#348
How do I change this text
Thread Starter
iTrader: (26)
Join Date: Jan 2005
Location: Behind the TIG welder
Posts: 7,294
Likes: 0
Received 2 Likes
on
2 Posts
You better f-ing call me when you come in...
Thanks!
Well, I got the meth tank fitting in place, just need to mount the tank and pump and run the wires. I also got the second waste gate about 85% done. I'll post pic in the a.m...
04-19-2009, 02:37 PM
#349
TECH Veteran
iTrader: (1)
Join Date: Apr 2004
Location: Arizona Bay
Posts: 4,038
Likes: 0
Received 0 Likes
on
0 Posts
The lower back pressure has more to due with the large T6 housing and BW's better turbine design than moving it up front. To say that moving the turbo to the front will reduce back pressure is misleading. I know you didn't say that, but others will read that.
04-20-2009, 01:38 AM
#350
How do I change this text
Thread Starter
iTrader: (26)
Join Date: Jan 2005
Location: Behind the TIG welder
Posts: 7,294
Likes: 0
Received 2 Likes
on
2 Posts
Got the second waste gate on today as well as my meth set-up done. I did a few low boost runs and it hold pretty stedy at 6 psi. At 10 psi I'm seeing 14ish psi in back pressure. the thing is just nuts at 10 psi.