Turbo header length
#1
Turbo header length
I noticed looking trough alot of posts that most people are running fairly long primary tubes on their custom turbo headers. Is there a reason for this other than space/clearance problems. You would think that the closer you could get the turbo to the motor the better, at least that is the way I built mine. Also what is the norm for the id of the tube? Thanks guys!
#4
Laying Down Rotary Law
Some people think close is better cause its closer to the exhuast pulse
WRONG!!!!!!!!!!
its about pressure!
you want long runners to keep the flow pressurized
Think of a garden hose
ever notice that with a long garden hose
when you turn off the water
and hold the gun sprayer
it still comes out strong
and the water takes longer to run out
then with a short water hose
get my drift?...hehe
WRONG!!!!!!!!!!
its about pressure!
you want long runners to keep the flow pressurized
Think of a garden hose
ever notice that with a long garden hose
when you turn off the water
and hold the gun sprayer
it still comes out strong
and the water takes longer to run out
then with a short water hose
get my drift?...hehe
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#10
Laying Down Rotary Law
looks Nice!
you'll still be able to make decent power
but you could make more with a nice "header" turbo manifold
that turbo can come much further
lke this one
you'll still be able to make decent power
but you could make more with a nice "header" turbo manifold
that turbo can come much further
lke this one
#13
Hey, where did my $$$ go?
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Like ZeroR said, its not going to be THAT big of an issue. I wouldnt scrap it. At least finish the car and see how it feels. If you are happy with the car then leave it alone.
#14
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At least I have someone that agrees with me. I have been saying this for at least 3 yrs ever since my first turbo kit became available to the public.
Originally Posted by kabooski
Some people think close is better cause its closer to the exhuast pulse
WRONG!!!!!!!!!!
its about pressure!
you want long runners to keep the flow pressurized
Think of a garden hose
ever notice that with a long garden hose
when you turn off the water
and hold the gun sprayer
it still comes out strong
and the water takes longer to run out
then with a short water hose
get my drift?...hehe
WRONG!!!!!!!!!!
its about pressure!
you want long runners to keep the flow pressurized
Think of a garden hose
ever notice that with a long garden hose
when you turn off the water
and hold the gun sprayer
it still comes out strong
and the water takes longer to run out
then with a short water hose
get my drift?...hehe
#15
I slept on it last night and I think that is what I will do. Then mabe try a longer primary and dyno the car again to see the diff.
Thanks everyone
And pluto, I had a little setback on the progress of my car but it should be ready for you to tune before the end of the year.
Thanks everyone
And pluto, I had a little setback on the progress of my car but it should be ready for you to tune before the end of the year.
#16
Need more sleep
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LOL ... that water hose analogy ain't doing it for me. No offense meant, but I don't think our manifold runners are storing energy due to dilation under pressure. Maybe it has something to do with the mixture accelerating to a higher velocity as it has more time to expand in a longer runner or perhaps there is some pressure wave phasing that works. Either way I can by a longer runner length being superior but the hose analogy ain't doing it for me, still LOL
#17
Read another thread that talked about positive and negative pressure waves. I'll buy that theory BUT it did not say that it was a restriction but a way to tune the power curve. By running shorter or longer pri. you shift the power curve up and down just like intake runer length does. Now that sounds very beliveable.
#18
Laying Down Rotary Law
blah lol
I know its not a technical explanation
but the basic pricinple is there
I know I had way less lag
(time when it hits positive pressure)
with a 16" tubular manifold
compared to the HKS cast manifold I got now
thats a FACT
I'm working on a 100% new setup
going back to a nice 2" OD long runners tubular manifold
I know its not a technical explanation
but the basic pricinple is there
I know I had way less lag
(time when it hits positive pressure)
with a 16" tubular manifold
compared to the HKS cast manifold I got now
thats a FACT
I'm working on a 100% new setup
going back to a nice 2" OD long runners tubular manifold
Last edited by kabooski; 10-28-05 at 09:54 PM.
#21
It is a gen 1 cover. I hate to be a pic ***** but I have all the pics of my car in the other rotary section under RX3 street/race check it out.
Do you think that going from a cast manifold to a true tube header had anything to do with it regardless to length?
Do you think that going from a cast manifold to a true tube header had anything to do with it regardless to length?
#22
Laying Down Rotary Law
well all I know
if your looking for the best design
a tubular manifold can't be beat
after attending NMRA, NHRA, NDRA and World Street nationals events
I've seen some crazy long turbo headers
in mustangs they put 101mm turbos all the way to the front of the car righ in the middle
there has to be some reason
why people with very large turbos run...very long turbo manifold
John shepard's Talon has a GT42R/T4 with a Long *** turbo header that runs sideways
to the passenger sde
and he has run 7.9's
if your looking for the best design
a tubular manifold can't be beat
after attending NMRA, NHRA, NDRA and World Street nationals events
I've seen some crazy long turbo headers
in mustangs they put 101mm turbos all the way to the front of the car righ in the middle
there has to be some reason
why people with very large turbos run...very long turbo manifold
John shepard's Talon has a GT42R/T4 with a Long *** turbo header that runs sideways
to the passenger sde
and he has run 7.9's
#25
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Originally Posted by 13B-RX3
It is a gen 1 cover. I hate to be a pic ***** but I have all the pics of my car in the other rotary section under RX3 street/race check it out.
Do you think that going from a cast manifold to a true tube header had anything to do with it regardless to length?
Do you think that going from a cast manifold to a true tube header had anything to do with it regardless to length?