Is the Series II exhaust manifold flow debate settled? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 04-18-2007, 07:30 PM   #1
Senior Member
Posts like a Corvette
Thread Starter
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default Is the Series II exhaust manifold flow debate settled?

From what I gather, the conventional wisdom is that Series II front exhaust manifold is more restrictive to flow than the rear.
But the only actual numbers I can find are from this old thread...
http://www.bonnevilleclub.com/forum/...ght=A&start=20

...and they completely contradict that idea; however, there are some questions about methodology and the possibility that the numbers were "in the wrong columns."

So, has there been more recent flowbenching (or other verification) done on the front versus rear flow on Series II exhaust manifolds?
agrazela is offline   Reply With Quote
Old 04-18-2007, 08:07 PM   #2
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

This isn't complety off topic but, another alternative for a front mani could be to have a tubular fbody 3800 manifold modified to fit. They came with tubular then switched to cast IIRC.
95naSTA is offline   Reply With Quote
Old 04-19-2007, 11:57 AM   #3
Senior Member
Posts like a Corvette
Thread Starter
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

Quote:
Originally Posted by 95naSTA
This isn't complety off topic but, another alternative for a front mani could be to have a tubular fbody 3800 manifold modified to fit. They came with tubular then switched to cast IIRC.
I guess this gets to the heart of my question...is there a proven need (performance-wise) for an alternative front manifold?

Consensus says "yes."
Data in the thread I linked above says "perhaps not."
Is there any newer data?
agrazela is offline   Reply With Quote
Old 04-19-2007, 12:00 PM   #4
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

I didn't have data logging at the time... all my testing said yes, there is a noticable flow improvement from manifold to PEM and another difference from PEM to header.
BillBoost37 is offline   Reply With Quote
Old 04-19-2007, 01:10 PM   #5
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

I have not heard about any newer data or testing done since that thread last year.

However, I can most certainly speak to the felt improvement using front and back PEMs over stock manifolds. Mine were installed last October with very nice results! Again, I have no data, since I did not do before and after testing, but I can tell you that my scanner doesn't show any issues with lean banks either front or back. And my car runs much stronger through the power band with smoother shifts and throttle response.

A worthy mod for those not wanting or needing to go all the way to headers, IMO.
lash is offline   Reply With Quote
Old 04-19-2007, 01:29 PM   #6
Senior Member
Posts like a Corvette
Thread Starter
 
Join Date: Jan 2007
Location: San Diego, CA
Posts: 1,451
Thanks: 0
Thanked 0 Times in 0 Posts
agrazela is on a distinguished road
Default

Quote:
Originally Posted by lash
A worthy mod for those not wanting or needing to go all the way to headers, IMO.
Or those (like me) living in an urban California county, where headers (or any other exhuast mod) are illegal for street use on most cars.
agrazela is offline   Reply With Quote
Old 04-19-2007, 01:46 PM   #7
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

Slightly off topic...

I could never quite understand the reasoning behind that law in California. I know that in both eprevious vehicles that I've installed headers, I gained both power AND increased gas mileage.

I know, I know, it'* really about total emissions...

But when I think about the better fuel efficiency that can be had using headers, I equate that with lower total emissions for the equivelant amount of power.

That having been said, PEMs would fit your requirement just right. They will look stock but provide a power and efficiency boost.
lash is offline   Reply With Quote
Old 04-19-2007, 01:46 PM   #8
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

I thought TOGs were legal in Cali?
95naSTA is offline   Reply With Quote
Old 04-19-2007, 02:14 PM   #9
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Quote:
Originally Posted by 95naSTA
I thought TOGs were legal in Cali?
but...are they approved for his car?
BillBoost37 is offline   Reply With Quote
Old 04-19-2007, 02:20 PM   #10
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37
Quote:
Originally Posted by 95naSTA
I thought TOGs were legal in Cali?
but...are they approved for his car?
I don't even know for sure if they are still approved in GPs since they aren't made by the same people anymore. Thats what the ? was for.
95naSTA is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Starter Replacement on a Settled Motor... ShastaWriter Oldsmobile 1 06-14-2015 11:41 AM
I.D. on Series II stock rear exhaust manifold primary? agrazela General GM Chat 1 04-26-2007 02:49 PM
Series 1-Series 2 Debate trbomk3 General GM Chat 50 09-21-2006 08:25 AM
I settled with the Prudential Insurance on Friday! NJJeepYJ 1987-1991 6 09-07-2003 03:21 PM
Series 2 Intake manifold for a Series 1(supercharged) S1ofDSS Performance, Brainstorming & Tuning 11 03-02-2003 05:53 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:04 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.