402/408 Plenum Volume for FI
10-19-2005, 07:26 PM
#1
Launching!
Thread Starter
iTrader: (1)
Join Date: Feb 2003
Location: Huntsville, AL
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
402/408 Plenum Volume for FI Still researching my 402/408 FI buildup. Anyone have any comments on plenum volume? I'd like to stick with a plastic LSx style manifold, however, I'm not sure if any variant will have enough volume to be optimal.
Any comments? The only thing I seem to have discovered is that intake volume isn't as important in an FI application as it is in an NA application.
Any comments? The only thing I seem to have discovered is that intake volume isn't as important in an FI application as it is in an NA application.
10-19-2005, 07:52 PM
#2
Street or race? The only problem with the stock style manifold in FI is the increase is air speed and volume. More air will be crammed into the back of the stock-style intake and cause your cylinders to go lean unless you tune well for that problem. However for a street application, the stock style intake has very good streetability and will help keep a touchy pedal..
10-19-2005, 08:22 PM
#3
Launching!
Thread Starter
iTrader: (1)
Join Date: Feb 2003
Location: Huntsville, AL
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
Both, mostly race.
If such a phenomenon indeed exists, I don't understand how anyone could "tune" specifically for it. In addition, I don't understand how intake design can cause a (touchy) change in throttle response.
Can you elaborate on these points?
If such a phenomenon indeed exists, I don't understand how anyone could "tune" specifically for it. In addition, I don't understand how intake design can cause a (touchy) change in throttle response.
Can you elaborate on these points?
10-20-2005, 08:57 AM
#4
TECH Enthusiast
iTrader: (2)
Join Date: Apr 2005
Location: Gold Country California
Posts: 572
Likes: 0
Received 2 Likes
on
2 Posts
I have read a lot on the subject. Building a custom manifold. When it comes to FI plenum volume the general consensus is the bigger the better. Any stock style manifold with a bottom plenum and overhead runners limits the volume to only "so big". But they seem to make pretty serious power either way.
10-20-2005, 09:46 AM
#5
Launching!
Thread Starter
iTrader: (1)
Join Date: Feb 2003
Location: Huntsville, AL
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
So, any ideas on what my best bet would be? I'm seriously considering picking up a 6.0 intake, then I can test it and my stock LS6 and see which one works best where I need it to.
10-20-2005, 10:33 AM
#6
TECH Enthusiast
iTrader: (2)
Join Date: Apr 2005
Location: Gold Country California
Posts: 572
Likes: 0
Received 2 Likes
on
2 Posts
Originally Posted by Drake
So, any ideas on what my best bet would be? I'm seriously considering picking up a 6.0 intake, then I can test it and my stock LS6 and see which one works best where I need it to.
Trending Topics
10-20-2005, 12:41 PM
#8
LS1TECH Sponsor
Join Date: Nov 2004
Location: Michigan
Posts: 344
Likes: 0
Received 0 Likes
on
0 Posts
Perhaps if you added more information as to the combo you want to run and your goals you may receive a better response. "Moslty race" doesn't give us that much to go on.
Runners that tend to lean on like the rear cylinders on the LS engine in FI applications can be tuned with SEFI like the BS3 unit due to individual cylinder trims.
Runners that tend to lean on like the rear cylinders on the LS engine in FI applications can be tuned with SEFI like the BS3 unit due to individual cylinder trims.
10-20-2005, 01:45 PM
#9
Launching!
Thread Starter
iTrader: (1)
Join Date: Feb 2003
Location: Huntsville, AL
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
Runners that tend to lean on like the rear cylinders on the LS engine in FI applications can be tuned with SEFI like the BS3 unit due to individual cylinder trims.
10-20-2005, 06:32 PM
#11
Launching!
Thread Starter
iTrader: (1)
Join Date: Feb 2003
Location: Huntsville, AL
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
Yep, I was thinking of something along those lines... It's going to be a bit before I'm ready to build up the cold side, though, so I've got plenty of time to decide.
