98-99 Manifolds

***CPWire*** · 09-03-2008, 11:41 AM

Okay, as the debate goes on about manifolds vs. headers, we decided to check something out.
With our coming 1-3/4" headers, we wanted to see what the stock F-body manifolds would do on a modified engine, so when we bolt up the headers, we can see what difference it gets.
Engine is a '99 LS1 with 90mm Throttle body, FAST intake, Dart 225 heads, and a custom cam.

The manifolds choke the engine around 5400 RPM. Now, in the next few weeks, we will have a dyno pull of the 1-3/4" long tube headers coming soon.

I wish we had time to bolt up the Sanderson Shorty's, but that's just not going to happen this time around.

***philntx*** · 09-03-2008, 11:45 AM

Wow! Was this on a chassis dyno? Even with stock exhaust manifolds, this little motor makes some great HP/Torque numbers!

Keep up the great work/research!

***CPWire*** · 09-03-2008, 11:47 AM

Quote: Originally Posted by philntx

Wow! Was this on a chassis dyno? Even with stock exhaust manifolds, this little motor makes some great HP/Torque numbers!

Keep up the great work/research!

Yup, chassis dyno.

Those are SAE numbers which by most accounts are low. STD numbers are higher, so most people like those better.

denali_on_26's · 09-03-2008, 02:00 PM

well my buddy has a 99 t/a with a ok cam and a ls6 intake and stock t-body and long tubes everything else is stock and his sae numbers were 367rwhp and 345rwtq on a dynojet dyno if that helps any..

also that was through a broke convertor (would not stay in lock up)

jinusow · 09-03-2008, 04:09 PM

This is why I want tubes before I do internals to my ls1. Thanks can't wait to see numbers on the tubes.

denali_on_26's · 09-22-2008, 05:14 PM

have you had time to slap a set of shorties on the dyno yet?

bitchin sonoma · 09-23-2008, 11:55 AM

when is this 1 3/4 will be done and how much?

***CPWire*** · 09-23-2008, 12:31 PM

Well... I just got off the phone with the people who are making the tubes for me. They are going to try and have them done by next week. So Hopefully it won't be too much longer.

Still shooting for around $750. We will see once we get a few sets all done though.

denali_on_26's · 09-23-2008, 12:43 PM

Quote: Originally Posted by 97 SS 350

Well... I just got off the phone with the people who are making the tubes for me. They are going to try and have them done by next week. So Hopefully it won't be too much longer.

Still shooting for around $750. We will see once we get a few sets all done though.

RazorS10 · 09-25-2008, 02:09 PM

Awesome jared keep up the good work.

91sonomast · 09-25-2008, 08:42 PM

i dont have any plans of putting a LSx in my truck in the very near future, but these 1.75 long tubes even excite me lol

***SweetS10V8*** · 09-25-2008, 10:56 PM

Why arent you doing these on an engine dyno? That way you can do the testing on the same day, which makes results much more accurate.

***SweetS10V8*** · 09-26-2008, 09:35 PM

If I had a set I would do it for you tommorow morning.

***CPWire*** · 09-27-2008, 09:09 AM

Quote: Originally Posted by SweetS10V8

Why arent you doing these on an engine dyno? That way you can do the testing on the same day, which makes results much more accurate.

Because I don't have access to an engine dyno.

Yogi · 09-27-2008, 11:15 AM

Quote: Originally Posted by 97 SS 350

Because I don't have access to an engine dyno.

Good reason!

09-03-2008, 11:45 AM	#2
*philntx* Build them right....Mod Age: 54 Join Date: Jul 2006 Posts: 2,284 Location: Plano TX User is: OffLine	Re: 98-99 Manifolds Wow! Was this on a chassis dyno? Even with stock exhaust manifolds, this little motor makes some great HP/Torque numbers! Keep up the great work/research!
	[Reply w/Quote]

09-03-2008, 11:47 AM	#3
*CPWire* Makin Sparks Age: 31 Join Date: Jun 2002 Posts: 1,265 Location: Hudson, Florida User is: OffLine	Re: 98-99 Manifolds Quote: Originally Posted by philntx Wow! Was this on a chassis dyno? Even with stock exhaust manifolds, this little motor makes some great HP/Torque numbers! Keep up the great work/research! Yup, chassis dyno. Those are SAE numbers which by most accounts are low. STD numbers are higher, so most people like those better.
	[Reply w/Quote]

09-03-2008, 02:00 PM	#4
denali_on_26's i like (.)(.) & \'/ Join Date: Aug 2008 Posts: 652 Location: hattiesburg, MS User is: OffLine	Re: 98-99 Manifolds well my buddy has a 99 t/a with a ok cam and a ls6 intake and stock t-body and long tubes everything else is stock and his sae numbers were 367rwhp and 345rwtq on a dynojet dyno if that helps any.. also that was through a broke convertor (would not stay in lock up)
	[Reply w/Quote]

09-03-2008, 04:09 PM	#5
jinusow Registered User Age: 26 Join Date: Sep 2005 Posts: 152 Location: User is: OffLine	Re: 98-99 Manifolds This is why I want tubes before I do internals to my ls1. Thanks can't wait to see numbers on the tubes.
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09-22-2008, 05:14 PM	#6
denali_on_26's i like (.)(.) & \'/ Join Date: Aug 2008 Posts: 652 Location: hattiesburg, MS User is: OffLine	Re: 98-99 Manifolds have you had time to slap a set of shorties on the dyno yet?
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09-23-2008, 11:55 AM	#7
bitchin sonoma he,he,he project over kil Age: 25 Join Date: Jul 2003 Posts: 1,589 Location: Benton harbor, Michigan User is: OffLine	Re: 98-99 Manifolds when is this 1 3/4 will be done and how much?
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09-23-2008, 12:31 PM	#8
*CPWire* Makin Sparks Age: 31 Join Date: Jun 2002 Posts: 1,265 Location: Hudson, Florida User is: OffLine	Re: 98-99 Manifolds Well... I just got off the phone with the people who are making the tubes for me. They are going to try and have them done by next week. So Hopefully it won't be too much longer. Still shooting for around $750. We will see once we get a few sets all done though.
	[Reply w/Quote]

09-23-2008, 12:43 PM	#9
denali_on_26's i like (.)(.) & \'/ Join Date: Aug 2008 Posts: 652 Location: hattiesburg, MS User is: OffLine	Re: 98-99 Manifolds Quote: Originally Posted by 97 SS 350 Well... I just got off the phone with the people who are making the tubes for me. They are going to try and have them done by next week. So Hopefully it won't be too much longer. Still shooting for around $750. We will see once we get a few sets all done though.
	[Reply w/Quote]

09-25-2008, 02:09 PM	#10
RazorS10 Registered User Join Date: Mar 2007 Posts: 406 Location: User is: OffLine	Re: 98-99 Manifolds Awesome jared keep up the good work.
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09-25-2008, 08:42 PM	#11
91sonomast Good Bye SonomaST Age: 25 Join Date: Sep 2005 Posts: 6,193 Location: Murray, KY User is: OffLine	Re: 98-99 Manifolds i dont have any plans of putting a LSx in my truck in the very near future, but these 1.75 long tubes even excite me lol
	[Reply w/Quote]

09-27-2008, 09:09 AM	#14
*CPWire* Makin Sparks Age: 31 Join Date: Jun 2002 Posts: 1,265 Location: Hudson, Florida User is: OffLine	Re: 98-99 Manifolds Quote: Originally Posted by SweetS10V8 Why arent you doing these on an engine dyno? That way you can do the testing on the same day, which makes results much more accurate. Because I don't have access to an engine dyno.
	[Reply w/Quote]

09-27-2008, 11:15 AM	#15
Yogi Registered (Ab) User Join Date: Feb 2008 Posts: 4,107 Location: League City, TX (Houston) User is: OffLine	Re: 98-99 Manifolds Quote: Originally Posted by 97 SS 350 Because I don't have access to an engine dyno. Good reason!
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