Rear mount guys: Header wrap?
On The Tree
Joined: Dec 2004
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http://www.grandamgt.com/forum/showthread.php?t=75497
Don't forget to get a turbo blanket also! Big difference in spool time!
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
Back to front is best because you hide the leading edge of the wrap from the wind. It will help your wrap stay tight and not fray for much longer.
My first build with dual exhaust I did one front to back and the other rear to front. The one I did front to rear needed re-doing after 2 years while the other was nice and tight.
Latest duals with a layer of ceramic batting under the wrap:
Jim
My first build with dual exhaust I did one front to back and the other rear to front. The one I did front to rear needed re-doing after 2 years while the other was nice and tight.
Latest duals with a layer of ceramic batting under the wrap:
Jim
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Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
Back to front is best because you hide the leading edge of the wrap from the wind. It will help your wrap stay tight and not fray for much longer.
My first build with dual exhaust I did one front to back and the other rear to front. The one I did front to rear needed re-doing after 2 years while the other was nice and tight.
Jim
My first build with dual exhaust I did one front to back and the other rear to front. The one I did front to rear needed re-doing after 2 years while the other was nice and tight.
Jim
Just my $0.02
The wind thing is a valid point 
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Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
the bigger the ratio, IE 1.05 - the laggier the turbo will be (but ull see more power). Heat wrapping vs non - i have not really seen any solid evidence but its just going by how turbos work.. heat = good. spend the extra cash for a couple rolls of heat wrap and ur good.
the bigger the ratio, IE 1.05 - the laggier the turbo will be (but ull see more power). Heat wrapping vs non - i have not really seen any solid evidence but its just going by how turbos work.. heat = good. spend the extra cash for a couple rolls of heat wrap and ur good.
irun4cops,
the a/r you decide on has many factors. With a rear mount one of the biggest factors i've seen is in the transmission type. Stick shifts tend to make less usable power on the larger turbos with rear mounts so i'd personally stick with the smaller a/r like .81 for the 600 rwhp range.
You DEFINATELY want to wrap or coat the exhaust, it makes a VERY big difference in how the car drives.
I personally just upgraded my 1.00 a/r 83mm turbine 80mm compressor wheel to a 1.25 a/r 87mm turbine with the same 80mm and the higher flowing race cover. I'll be doing a write up on my findings in a few weeks after I get it installed next week. My current setup works very good and has just enough lag to get traction on the street.
Thread Starter
TECH Apprentice
Joined: Jan 2007
Posts: 396
Likes: 0
thanks for all the input guys
do you have anymore pics of your setup DeltaT? is it single or twin turbo? did you notice much of a difference with the balance pipe?
Zombie: is you 6 liter completely forged or just pistons and rods, i forgot.
thanks again, Mark
do you have anymore pics of your setup DeltaT? is it single or twin turbo? did you notice much of a difference with the balance pipe?
Zombie: is you 6 liter completely forged or just pistons and rods, i forgot.
thanks again, Mark
I'm expecting more lag, have to wait until next week to see if I notice it. One of the nice things about stalled autos is they mask lag. When I went from a .81 a/r on my t76 to a .96 a/r I never noticed the lag difference, just extra top end power.
i was referring to actual RPM #s (sounded like thats what he was looking to see). I am sure it would vary based on location, elevation, temp, all that good stuff is all i meant lol
Last edited by sujomatt; Feb 6, 2009 at 09:02 AM.
