first test drive after ls longtubes
09-04-2011 | 10:33 PM
#1
Thread Starter
Joined: Dec 1999
Posts: 3,532
Likes: 18
From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
first test drive after ls longtubes
I had a pretty bad rasp with the manifolds and after seeing countless longtube installs on ls1tech ending with unbearable rasp I was planning for the worst. well Im surprised and glade its gone
guess my merge I made worked very well 
guess my merge I made worked very well
09-05-2011 | 08:51 AM
#2
Joined: Sep 2002
Posts: 3,685
Likes: 10
From: PA
Car: 86 Trans AM
Engine: LS1 (not stock...)
Transmission: Built T56
Axle/Gears: Strange 12-bolt w/ 3.73
Re: first test drive after ls longtubes
So what is your whole set up now? I have LT's, a custom merge, and magnaflow. The ypipe flows about as smooth as you can get, and the merge is a flowmaster 2.5-3. So it should be pretty decent too. But I still get more rasp than I like. Was thinking about fighting it with some high flow cats someday.
J.
J.
09-05-2011 | 06:28 PM
#5
Supreme Member
iTrader: (2)
Joined: Dec 2006
Posts: 5,538
Likes: 0
From: Hou. TX
Car: 86 TA, 91 B4C
Engine: 5.3, 4.8
Transmission: 4L80 4000, T56
Axle/Gears: 4.30 M12, 23.42 10 bolt
Re: first test drive after ls longtubes
Manifolds...i have a pile of those, never used them. Rasp wise, my RS has 1 chambers, so you can imagine it is load, but it is deep, but the 86 TA with the 3 inch into a 3 inch Y with shortys has the bullet muffler and only really has raspieness at a given rpm slightly accelerating:
http://www.youtube.com/watch?v=QrMMhDP1EJY
http://www.youtube.com/watch?v=QrMMhDP1EJY
09-05-2011 | 07:10 PM
#6
Thread Starter
Joined: Dec 1999
Posts: 3,532
Likes: 18
From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
Re: first test drive after ls longtubes
its the hawks knock off long tubes and then its 3" SS mandrel bends to make up my y-pipe and I made my own merge and then the rest is the old slp catback 2 on the left
the only real difference is I went from the cast manifolds and changed the way I had the two pipes merge.
the only real difference is I went from the cast manifolds and changed the way I had the two pipes merge.
09-05-2011 | 10:41 PM
#7
Senior Member
iTrader: (8)
Joined: Sep 2010
Posts: 732
Likes: 0
From: Cincinnati, Ohio
Car: '89 GTA
Engine: 5.7L LS1
Transmission: 4L60E
Axle/Gears: 9 bolt 3.27
Re: first test drive after ls longtubes
Define rasp?
I dig the sound my car has with the manifolds, 2 1/2" Ypipe, flowmaster merge into SLP 2OTL catback.
I dig the sound my car has with the manifolds, 2 1/2" Ypipe, flowmaster merge into SLP 2OTL catback.
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09-06-2011 | 09:52 PM
#8
Thread Starter
Joined: Dec 1999
Posts: 3,532
Likes: 18
From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
Re: first test drive after ls longtubes
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