Turbo Manifolds 2008
12-09-2007, 06:51 PM
#22
1.0 BAR
Thread Starter
Join Date: Mar 2007
Posts: 247
Re: Turbo Manifolds 2008
Originally Posted by FPV_GTp
Schwitzer can you quote you camshaft specs please ?
Camshaft - Lobe Height
Intake 41.2689 mm
Exhaust 41.2698 mm
Valve Timing - Intake
Opens (BTDC) 8 deg.
Closes (ABDC) 52 deg.
Valve Timing - Exhaust
Opens (BBDC) 52 deg.
Closes (ATDC) 8 deg.
Valve Stem Thickness 6.0 mm
if that doesnt make sense scroll down to engine specifications alpha 1 NA vs turbo
http://www.iformation.co.za/scoupe/gtvset.htm
12-09-2007, 07:08 PM
#24
3.0 BAR
Join Date: Aug 2003
Location: NE-PA
Posts: 4,666
Re: Turbo Manifolds 2008
Originally Posted by Inquisition
Are you suggesting more or less overlap or independent upon the setup? Either way I agree overlap is a key ingredient when picking a manifold. Basically if you are going to run EMP:IMP of 1:1 or close to, lots of overlap with a big cam = big power. This is new fangled turbo theory, but it works. You make a lot more power because you actually end up with some scavenging. Old turbo theory which also works, just not as well is, smaller cam with no overlap for when your EMP>IMP by a great deal. This doesn't really promote scavenging but minimizes reversion. This works, just not as well as new fangled turbo theory seems to.
have a greater tendency to increase exhaust scavenging. Less overlap is required with a ram horn or equal length design. As long as a low pressure ratio is kept on the exhaust side of a log manifold increasing both duration and overlap can be quite beneficial. Exhaust A/R and exhaust size comes in to play as far as pressure is concerned, and it's not uncommon to see 2 to 3 times the amount of exhaust pressure as compared to boost pressure when hitting the limits of a smaller turbo. For example, the last .48/.60 50 trim t3 I ran on my old b16 was reaching around 35-40psi of exhaust pressure when compared to the wimpy 11psi that was being put into the motor. An upgrade to a .63 a/r housing dropped a considerable amount of pressure, as well as a nice smooth straight 3" exhaust (or 3" open dp in that situation
).
12-09-2007, 07:12 PM
#25
1.0 BAR
Thread Starter
Join Date: Mar 2007
Posts: 247
Re: Turbo Manifolds 2008
Originally Posted by Inquisition
Theres no overlap on that cam. EL manifolds won't work well for your application.
So thats why my car pick up so much lag/lost performance?
So should i stick to this manifold and change cam? or go for the loggy/4-2-1?
---- looks like this topic bitt off more than i can chew... But we getting there..
This is the SPec 1 cam stat's im assuming its worse then mine APB
Camshaft - Lobe Height
Intake 41.0837 mm
Exhaust 41.2698 mm
Valve Timing - Intake
Opens (BTDC) 14 deg.
Closes (ABDC) 42 deg.
Valve Timing - Exhaust
Opens (BBDC) 52 deg.
Closes (ATDC) 8 deg.
12-10-2007, 01:51 AM
#29
1.0 BAR
Thread Starter
Join Date: Mar 2007
Posts: 247
Re: Turbo Manifolds 2008
Originally Posted by Schwitzer Turbo
Im assuming Equal Length manifolds is EL/Ramhorn/tubular.
So thats why my car pick up so much lag/lost performance?
So should i stick to this manifold and change cam? or go for the loggy/4-2-1?
---- looks like this topic bitt off more than i can chew... But we getting there..
This is the SPec 1 cam stat's im assuming its worse then mine APB
Camshaft - Lobe Height
Intake 41.0837 mm
Exhaust 41.2698 mm
Valve Timing - Intake
Opens (BTDC) 14 deg.
Closes (ABDC) 42 deg.
Valve Timing - Exhaust
Opens (BBDC) 52 deg.
Closes (ATDC) 8 deg.
So thats why my car pick up so much lag/lost performance?
So should i stick to this manifold and change cam? or go for the loggy/4-2-1?
---- looks like this topic bitt off more than i can chew... But we getting there..
This is the SPec 1 cam stat's im assuming its worse then mine APB
Camshaft - Lobe Height
Intake 41.0837 mm
Exhaust 41.2698 mm
Valve Timing - Intake
Opens (BTDC) 14 deg.
Closes (ABDC) 42 deg.
Valve Timing - Exhaust
Opens (BBDC) 52 deg.
Closes (ATDC) 8 deg.
12-10-2007, 02:03 AM
#30
0.0 BAR
Join Date: Aug 2007
Posts: 44
Re: Turbo Manifolds 2008
Originally Posted by Schwitzer Turbo
can you not have the best of both worlds with a custom manifold? if you can this is the manifold i seek!!!!!!
Anyway as i said before the Fastest Honda im my state runs a Log and he is a gewd 1-2 seconds faster than anyone else!!!
[color=pink]My new concern is, Log Generates more thermal efficency/heat. and your intake temp is directly related to how much you can boost on a given fuel. so is this one of the reason why tubular is said to be more superior? because you would beable to booost more?[/color]
do you need "TOP END POWER/HIGH HP" to run gewd 400m times?
Anyway as i said before the Fastest Honda im my state runs a Log and he is a gewd 1-2 seconds faster than anyone else!!!
[color=pink]My new concern is, Log Generates more thermal efficency/heat. and your intake temp is directly related to how much you can boost on a given fuel. so is this one of the reason why tubular is said to be more superior? because you would beable to booost more?[/color]
do you need "TOP END POWER/HIGH HP" to run gewd 400m times?
