...

Go Back   Lateral-g Forums > Technical Discussions > LSX Conversions
User Name
Password



Reply
 
Thread Tools Display Modes
  #11  
Old 07-01-2019, 10:48 AM
carbuff's Avatar
carbuff carbuff is offline
Senior Member
 
Join Date: Dec 2004
Location: Austin, Tx
Posts: 1,306
Thanks: 6
Thanked 19 Times in 13 Posts
Default

Greg,

You also have the advantage of a bigger shaker than Bob and I do. The later 2nd gen shakers have a steeper front edge which may help you out also...

In addition to the Dude Scoop that PTFB makes/sells, he also has a conical filter that may possibly work for you (I'm considering it also). He seems to have a shorter and a taller version of it. If you can get a drop base that it will sit in and clear, and your shaker will sit down over it, then I think that's a good option. With the bigger shaker scoop you have, it might work for you.

The one concern would be the shift to the side. Hard to tell how close the conical filter would be to the hood / shaker if your engine is offset that much.

Just one more think I'm also considering.
Reply With Quote
  #12  
Old 07-01-2019, 03:16 PM
Gscherer78ta's Avatar
Gscherer78ta Gscherer78ta is offline
Senior Member
 
Join Date: Nov 2014
Location: Ft. Worth, TX
Posts: 156
Thanks: 0
Thanked 6 Times in 5 Posts
Default

Quote:
Originally Posted by carbuff View Post
Greg, interesting data point here. When I dynoed a couple of weeks ago, we did so both with and without my current round filter installed. We removed it after a few pulls since we noticed vacuum in the manifold and wanted to see if it was the filter. It made very little difference. So we did the tuning without it installed and then reinstalled for one last pull. We lost 6HP when reinstalled, but it was also heat soaked, so to me it was little to no loss.

The filter I'm using is a 9 3/4" round 3" tall K&N at the moment just to give you an idea...



I look forward to seeing what you come up with. Keep us posted. I'll get back on my own setup here soon...
What explains the vacuum in the manifold if the restriction isn't the filter. I have been also wondering about the opening size of the shaker scoops. In Bob's case I don't think that's an issue because it's open all the way around. If the only air is coming through that opening, does that choke the flow?
__________________
Greg

'78 Trans Am - Y88-R LS3/T56,
Holley EFI, UMI Performance
Reply With Quote
  #13  
Old 07-01-2019, 03:44 PM
SSLance's Avatar
SSLance SSLance is offline
Senior Member
 
Join Date: Oct 2013
Location: Peoria, AZ
Posts: 2,668
Thanks: 72
Thanked 337 Times in 211 Posts
Default

So one of the things I had to deal with on my EFI swap was the air cleaner tilt angle also. The Dual plane intake was tilted so the carb sat level and the single plane intake was not.





I already had a custom spacer to raise my cowl induction air cleaner up to seal against my hood but had to take about 0.600" off of the front of it and 0.200" off of the rear of it to set my air cleaner back against the hood.






I also had to bend about a 3 degree angle into the air cleaner stud so it lined up with the hole in top once again.

That doesn't fix the off to the one side issue but for front to back it worked like a champ.

__________________
Lance
1985 Monte Carlo SS Street Car
Reply With Quote
  #14  
Old 07-01-2019, 03:49 PM
carbuff's Avatar
carbuff carbuff is offline
Senior Member
 
Join Date: Dec 2004
Location: Austin, Tx
Posts: 1,306
Thanks: 6
Thanked 19 Times in 13 Posts
Default

Lance,

Did you use a mill to cut that angle? I've contemplated doing something similar, but as you said, it doesn't solve all of my problem...
Reply With Quote
  #15  
Old 07-01-2019, 03:55 PM
carbuff's Avatar
carbuff carbuff is offline
Senior Member
 
Join Date: Dec 2004
Location: Austin, Tx
Posts: 1,306
Thanks: 6
Thanked 19 Times in 13 Posts
Default

Quote:
Originally Posted by Gscherer78ta View Post
What explains the vacuum in the manifold if the restriction isn't the filter. I have been also wondering about the opening size of the shaker scoops. In Bob's case I don't think that's an issue because it's open all the way around. If the only air is coming through that opening, does that choke the flow?
Greg,

I believe I simply don't have a big enough plenum and throttle body to supply the air flow requirement of the engine. I have the highest-flowing 4150-style throttle body that I could find when I put it all together, but the engine is pulling a lot of air.

When we ran the engine on the engine dyno, we switched from the original intake I was planning to use (a ported Super Victor for the LS7) which also used the 4150 throttle body to a Mast 4500 single plane intake. No other changes. Peak HP increased by about 15HP, but the curve held on amazingly well with the Mast where the 4150 Super Victor started to roll off. The 4500-Mast could flow a lot more air into the engine. The problem is all of the 4500 throttle bodies which I have found are significantly taller than my 4150, which further complicates the problem we are already fighting...

I have to choke my engine to an extent with an even more odd-ball setup of intake to get things to fit. I'm using the LS3 version of the Victor Jr with adapters to mate to my heads. That dropped things down about an inch to get me where I am currently at. It was a painful thing to do, but I haven't found another good option yet.

One last thing... With the previous engine in the car and my previous shaker setup, removing the shaker (but leaving the air filter in place) didn't change the HP at all. I was using a 2.5" tall 14" round K&N with the K&N Extreme top in that case. So the shaker was flowing enough air to keep that fed which surprised me.
Reply With Quote
  #16  
Old 07-01-2019, 05:32 PM
SSLance's Avatar
SSLance SSLance is offline
Senior Member
 
Join Date: Oct 2013
Location: Peoria, AZ
Posts: 2,668
Thanks: 72
Thanked 337 Times in 211 Posts
Default

Quote:
Originally Posted by carbuff View Post
Lance,

Did you use a mill to cut that angle? I've contemplated doing something similar, but as you said, it doesn't solve all of my problem...
Yes, a friend chucked it up on a mill he has access too and shaved it down. Its funky looking for sure but solved the issue perfectly.
__________________
Lance
1985 Monte Carlo SS Street Car
Reply With Quote
  #17  
Old 07-02-2019, 08:03 AM
Gscherer78ta's Avatar
Gscherer78ta Gscherer78ta is offline
Senior Member
 
Join Date: Nov 2014
Location: Ft. Worth, TX
Posts: 156
Thanks: 0
Thanked 6 Times in 5 Posts
Default

Quote:
Originally Posted by carbuff View Post
Greg,

I believe I simply don't have a big enough plenum and throttle body to supply the air flow requirement of the engine. I have the highest-flowing 4150-style throttle body that I could find when I put it all together, but the engine is pulling a lot of air.

When we ran the engine on the engine dyno, we switched from the original intake I was planning to use (a ported Super Victor for the LS7) which also used the 4150 throttle body to a Mast 4500 single plane intake. No other changes. Peak HP increased by about 15HP, but the curve held on amazingly well with the Mast where the 4150 Super Victor started to roll off. The 4500-Mast could flow a lot more air into the engine. The problem is all of the 4500 throttle bodies which I have found are significantly taller than my 4150, which further complicates the problem we are already fighting...

I have to choke my engine to an extent with an even more odd-ball setup of intake to get things to fit. I'm using the LS3 version of the Victor Jr with adapters to mate to my heads. That dropped things down about an inch to get me where I am currently at. It was a painful thing to do, but I haven't found another good option yet.

One last thing... With the previous engine in the car and my previous shaker setup, removing the shaker (but leaving the air filter in place) didn't change the HP at all. I was using a 2.5" tall 14" round K&N with the K&N Extreme top in that case. So the shaker was flowing enough air to keep that fed which surprised me.

Great stuff there Bryan! I too have the LS3 version of the victor Jr intake. I haven't run it yet with the shaker scoop on it yet and, It's not learned enough for that to even matter yet.
__________________
Greg

'78 Trans Am - Y88-R LS3/T56,
Holley EFI, UMI Performance
Reply With Quote
  #18  
Old 07-02-2019, 08:04 AM
Gscherer78ta's Avatar
Gscherer78ta Gscherer78ta is offline
Senior Member
 
Join Date: Nov 2014
Location: Ft. Worth, TX
Posts: 156
Thanks: 0
Thanked 6 Times in 5 Posts
Default

Lance - I will have tilt to deal with as well.
__________________
Greg

'78 Trans Am - Y88-R LS3/T56,
Holley EFI, UMI Performance
Reply With Quote
  #19  
Old 07-03-2019, 08:30 AM
Josh@Ridetech's Avatar
Josh@Ridetech Josh@Ridetech is offline
Lateral-g Supporting Vendor
 
Join Date: Apr 2013
Posts: 381
Thanks: 17
Thanked 21 Times in 13 Posts
Default

Definitely some good ideas here. I've been trying to figure out how I'm going to do mine with my LS3 intake.
__________________
Reply With Quote
  #20  
Old 07-18-2019, 11:00 PM
Panteracer's Avatar
Panteracer Panteracer is offline
Senior Member
 
Join Date: Oct 2013
Location: SF bay area
Posts: 1,127
Thanks: 1
Thanked 138 Times in 76 Posts
Default 78ta with Holley

Greg
A couple of shots of my setup

Bob
Attached Images
 
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:02 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright Lateral-g.net