LB9 with Dyno Don headers and y-pipe. Tuning changes? - Third Generation F-Body Message Boards


DIY PROM Do It Yourself PROM chip burning help. No PROM begging. No PROMs for sale. No commercial exchange. Not a referral service.

LB9 with Dyno Don headers and y-pipe. Tuning changes?

Reply
 
Thread Tools Search this Thread
Old 10-11-2017, 10:04 PM   #1
Senior Member
Thread Starter
 
Join Date: Mar 2017
Posts: 926

LB9 with Dyno Don headers and y-pipe. Tuning changes?

LB9 with 1.6 rockers. I've got 24lb injectors and high volume pump so fueling isn't an issue. I'll be bolting on Don's headers and y-pipe and hooking that up catless to my flowmaster axle back.

What changes am I likely to need to make to my $6E tune when I bolt these on? And what gains am I likely to see?

I've searched but didn't come up with much.

Anyone have rough numbers for performance increase? I keep reading the stock y-pipe is terrible but I don't see any test numbers.

GD

Last edited by GeneralDisorder; 10-11-2017 at 11:29 PM.
GeneralDisorder is offline   Reply With Quote
Old 10-11-2017, 11:18 PM   #2
Supreme Member
 
Join Date: Jan 2003
Posts: 1,990


Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

Id use your BLMs as a gauge. If the headers are doing something requiring fueling changes, it's likely to show up in your BLMs. You'd have to have an accurate baseline ahead of time though.
ULTM8Z is offline   Reply With Quote
Old 10-11-2017, 11:28 PM   #3
Senior Member
Thread Starter
 
Join Date: Mar 2017
Posts: 926

Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

Yes I will do that for sure but I don't expect BLM's to be much affected since those are locked out to 128 in PE mode. I doubt the exhaust is going to result in many changes to the idle and mid range. I'll be using my wideband for PE.

I'm more curious what gains people are seeing from the headers and y-pipe. I keep hearing the y-pipe is terrible, etc. I will do some volumetric efficiency calculations to estimate crank HP after I make the swap and check the tune.

GD
GeneralDisorder is offline   Reply With Quote
Old 10-11-2017, 11:36 PM   #4
Supreme Member
 
Join Date: Jan 2003
Posts: 1,990


Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

Yeah I was referring to part throttle. BLM changes could be an indicator of better scavenging.

Other than that, yeah you'll have to use your WB to play around with PE. If you knew what your AFRs were before, it'd be interesting to see if it gets leaner due to headers.
ULTM8Z is offline   Reply With Quote
Old 10-12-2017, 10:15 AM   #5
Senior Member
Thread Starter
 
Join Date: Mar 2017
Posts: 926

Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

Being a MAF car I'm curious to see if it can basically compensate on its own. They were factory crazy rich. Mine was in the neighborhood of 10.5:1 in PE. I leaned it out but it didn't seem to make more power even at 12.

GD
GeneralDisorder is offline   Reply With Quote
Old 10-12-2017, 11:11 AM   #6
Moderator
iTrader: (1)
 
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 16,595
Car: check
Engine: check
Transmission: check


Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

Quote:
Originally Posted by GeneralDisorder View Post
Being a MAF car I'm curious to see if it can basically compensate on its own. They were factory crazy rich. Mine was in the neighborhood of 10.5:1 in PE. I leaned it out but it didn't seem to make more power even at 12.

GD
That is done on purpose to put out the cat-con. Otherwise they can turn into a blast furnace.

Don't forget to increase the maximum airflow allowed table.

RBob.
RBob is offline   Reply With Quote
Old 10-12-2017, 11:24 AM   #7
Supreme Member
 
Join Date: Jan 2003
Posts: 1,990


Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

Quote:
Originally Posted by GeneralDisorder View Post
Being a MAF car I'm curious to see if it can basically compensate on its own. They were factory crazy rich. Mine was in the neighborhood of 10.5:1 in PE. I leaned it out but it didn't seem to make more power even at 12.

GD
My car seems to like about 12.7:1. I notice something when going from 12 to about 12.7-13:1.
ULTM8Z is offline   Reply With Quote
Old 10-12-2017, 11:39 AM   #8
Senior Member
Thread Starter
 
Join Date: Mar 2017
Posts: 926

Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

I'm so used to tuning turbo cars and I was being careful. Plus I am trying to figure out why I get some knock counts around 4500+ RPM. If certainly seems to be fake knock. When I put the headers on I'll try going leaner.

GD
GeneralDisorder is offline   Reply With Quote
Old 10-12-2017, 01:04 PM   #9
Senior Member
Thread Starter
 
Join Date: Mar 2017
Posts: 926

Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

Quote:
Originally Posted by RBob View Post
That is done on purpose to put out the cat-con. Otherwise they can turn into a blast furnace.

Don't forget to increase the maximum airflow allowed table.

RBob.

So adding more fuel richens the mixture, cooling the exhaust gas temps?

I've seen cats glow red from misfires which is basically a bunch of unburned fuel. And thats why the OBD-II cars will flash the CEL for misfires because it will destroy a cat quickly.... I guess it's a balancing act and they tuned it for a specific target converter temp?

No matter I'm taking the converter out. So I won't have that problem. A procharger 383 (going in later) isn't going to work out with a converter I'm pretty sure.

Doing the headers now for tuning fun and because exhaust needs replaced anyway. Also get the fitment figured out so the 383 install goes that much smoother. Also curious what improvements it will actually make on a stock LB9. I'll be sure to post my numbers.

GD
GeneralDisorder is offline   Reply With Quote
Old 10-12-2017, 01:04 PM   #10
Supreme Member
 
Join Date: Jan 2003
Posts: 1,990


Re: LB9 with Dyno Don headers and y-pipe. Tuning changes?

Quote:
Originally Posted by GeneralDisorder View Post
I'm so used to tuning turbo cars and I was being careful. Plus I am trying to figure out why I get some knock counts around 4500+ RPM. If certainly seems to be fake knock. When I put the headers on I'll try going leaner.

GD
It may lean out by itself a little due to improved scavenging...
ULTM8Z is offline   Reply With Quote
Reply


Go Back   Third Generation F-Body Message Boards >

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


Advertising
Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 06:14 PM.


All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: