View Poll Results: How much time off of 1/4 did you gain with LT's & ORY ?
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Typical gains in 1/4 with LT's ?
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From: Brick N.J. ( Jersey Shore )
Typical gains in 1/4 with LT's ? What is a typical gain to expect on a 98 Z28 with a stock engine in the 1/4 with 1 3/4 long tube headers and 3" ORY ?
I know the 98 -99s had the lowest flowing exhaust manifolds.
I am assuming @ 2 tenths .
My mods are : A4 ,373's ,4000 stall , drag radials ,lid and a magnaflow C/B .
I know the 98 -99s had the lowest flowing exhaust manifolds.
I am assuming @ 2 tenths .
My mods are : A4 ,373's ,4000 stall , drag radials ,lid and a magnaflow C/B .
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From: Brick N.J. ( Jersey Shore )
Kind of hard for people to give you an accurate answer because most people don't pay attention to DA.
You can't run a stock car in 2800+ DA 13.5@105 and then put headers on and run in 500+ DA and run 12.9@109... You did not pick up .6 and 4mph from headers, the majority of that was from the huge help in DA.
You can't say, "Well the weather was about the same." there are many factors that go into determining DA besides heat/cold.
Unless you have the run before/after headers WITH DA calculations, the results mean nothing.
Headers will pick your mph more than your ET. With headers/ORY/cutout I would expect a 3+mph pick up and around .2 ET reduction. If you get a tune it will only help more. Of course this also depends on the rest of the setup of an individual car.
My .02.
You can't run a stock car in 2800+ DA 13.5@105 and then put headers on and run in 500+ DA and run 12.9@109... You did not pick up .6 and 4mph from headers, the majority of that was from the huge help in DA.
You can't say, "Well the weather was about the same." there are many factors that go into determining DA besides heat/cold.
Unless you have the run before/after headers WITH DA calculations, the results mean nothing.
Headers will pick your mph more than your ET. With headers/ORY/cutout I would expect a 3+mph pick up and around .2 ET reduction. If you get a tune it will only help more. Of course this also depends on the rest of the setup of an individual car.
My .02.
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Joined: Jul 2008
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From: Trollin DFW Texas
Kind of hard for people to give you an accurate answer because most people don't pay attention to DA.
You can't run a stock car in 2800+ DA 13.5@105 and then put headers on and run in 500+ DA and run 12.9@109... You did not pick up .6 and 4mph from headers, the majority of that was from the huge help in DA.
You can't say, "Well the weather was about the same." there are many factors that go into determining DA besides heat/cold.
Unless you have the run before/after headers WITH DA calculations, the results mean nothing.
Headers will pick your mph more than your ET. With headers/ORY/cutout I would expect a 3+mph pick up and around .2 ET reduction. If you get a tune it will only help more. Of course this also depends on the rest of the setup of an individual car.
My .02.
You can't run a stock car in 2800+ DA 13.5@105 and then put headers on and run in 500+ DA and run 12.9@109... You did not pick up .6 and 4mph from headers, the majority of that was from the huge help in DA.
You can't say, "Well the weather was about the same." there are many factors that go into determining DA besides heat/cold.
Unless you have the run before/after headers WITH DA calculations, the results mean nothing.
Headers will pick your mph more than your ET. With headers/ORY/cutout I would expect a 3+mph pick up and around .2 ET reduction. If you get a tune it will only help more. Of course this also depends on the rest of the setup of an individual car.
My .02.
Thats is the best reply your gonna get down to the T!But do get a re tune like you said asap.
Never got a chance to go to LTs but I gained quite a bit on my 98 with the Edelbrock shorties:
https://ls1tech.com/forums/generatio...aders-ory.html
I would imagine atleast that with long tubes.
https://ls1tech.com/forums/generatio...aders-ory.html
I would imagine atleast that with long tubes.
In the 1/8th mile on stock manifolds I ran a 9.3@78. With headers and about a 900DA drop I ran an 8.4@87.
I made huge gains because of the DA improvement and because my stock cats were pretty much clogged. Picking up .9sec in the 1/8th mile is HUGE, it just all depends on how much the stock pipes are choking the motor. With a stock internal car, if you're running fast for the mods you have it probably won't help a whole lot. But on the other hand, if you're running a good bit slower (like I was) it could really wake the car up.
I made huge gains because of the DA improvement and because my stock cats were pretty much clogged. Picking up .9sec in the 1/8th mile is HUGE, it just all depends on how much the stock pipes are choking the motor. With a stock internal car, if you're running fast for the mods you have it probably won't help a whole lot. But on the other hand, if you're running a good bit slower (like I was) it could really wake the car up.