Intake Manifold Spacer - Dyno Mule Needed
12-23-2008, 02:13 AM
#31
Race Director
12-23-2008, 02:49 AM
#32
Rennlist Member
IIRC Tom Cloutier and/or the Thomases said that the spacers were only of value with increased breathing. I take that to mean that if those alone gain power on a stock setup, it's too little to be worthwhile.
Lance, some have extrude-honed their spider but after that it's mostly the heads and throttle body holding it back on the intake side. Exhaust and careful tuning can count for a lot... right Brian?
Lance, some have extrude-honed their spider but after that it's mostly the heads and throttle body holding it back on the intake side. Exhaust and careful tuning can count for a lot... right Brian?
12-23-2008, 11:58 AM
#33
Developer
Thread Starter
Todd, Nice fat intake manifold spacers!
I am surprised by how many 928's out there actually have these already installed, yet nobody seems to have an answer as to their before-and-after effect. 928 guys usually dont do stuff on "faith".
On the other hand, the spacers certainly won't hurt, so maybe they thought it was a zero-loss game and they might as well...
Anyway, soon we should have some numbers from Iceman (he has agreed to be one of my dyno testers). If there is a SC car in a warm climate (not mothballed for the winter like mine is) let me know.
I am surprised by how many 928's out there actually have these already installed, yet nobody seems to have an answer as to their before-and-after effect. 928 guys usually dont do stuff on "faith".
On the other hand, the spacers certainly won't hurt, so maybe they thought it was a zero-loss game and they might as well...
Anyway, soon we should have some numbers from Iceman (he has agreed to be one of my dyno testers). If there is a SC car in a warm climate (not mothballed for the winter like mine is) let me know.
12-23-2008, 01:06 PM
#35
Rennlist Member
Let me know, ill try it and dyno it on the stroker as well. I have been a big fan of the spacers ever since i saw what the S4 intake plenum looked like.
mk
mk
Todd, Nice fat intake manifold spacers!
I am surprised by how many 928's out there actually have these already installed, yet nobody seems to have an answer as to their before-and-after effect. 928 guys usually dont do stuff on "faith".
On the other hand, the spacers certainly won't hurt, so maybe they thought it was a zero-loss game and they might as well...
Anyway, soon we should have some numbers from Iceman (he has agreed to be one of my dyno testers). If there is a SC car in a warm climate (not mothballed for the winter like mine is) let me know.
I am surprised by how many 928's out there actually have these already installed, yet nobody seems to have an answer as to their before-and-after effect. 928 guys usually dont do stuff on "faith".
On the other hand, the spacers certainly won't hurt, so maybe they thought it was a zero-loss game and they might as well...
Anyway, soon we should have some numbers from Iceman (he has agreed to be one of my dyno testers). If there is a SC car in a warm climate (not mothballed for the winter like mine is) let me know.
12-23-2008, 01:09 PM
#36
Instructor
Hey Carl!
I really like that you are constantly upgrading and modifying the 928
I have a looooong whishlist of parts from your company 
Not to hijack your thread, but a while back I saw some pictures of spacers that were 2.5" wide. Who`s is it, and how did they work? Anyone know?
I really like that you are constantly upgrading and modifying the 928
I have a looooong whishlist of parts from your company Not to hijack your thread, but a while back I saw some pictures of spacers that were 2.5" wide. Who`s is it, and how did they work? Anyone know?
12-23-2008, 03:03 PM
#37
Race Director
I ordered mine today.......I hope to have some dyno #'s from both 928's in a week or so....one last thing to fix on sharky 1st......the widow is ready to install and test right now!
12-23-2008, 03:44 PM
#38
Nordschleife Master
they look nice, i would love to know what kind of results you get in back to back dyno's
I also dont think you could have these made yourself for less then what Carl is charging. The principal is sound, wether or not they work is another story. It is tight around those front and rear air horns though. I imagine they probably do produce some extra power at high RPM. If nothing more they do increase plenum volume a bit, again, wether or not that means anything.......dyno's dont lie
I also dont think you could have these made yourself for less then what Carl is charging. The principal is sound, wether or not they work is another story. It is tight around those front and rear air horns though. I imagine they probably do produce some extra power at high RPM. If nothing more they do increase plenum volume a bit, again, wether or not that means anything.......dyno's dont lie
12-23-2008, 05:55 PM
#39
Developer
Thread Starter
V8 Man - I like that hood! Is it f'glass, or is it a modified OEM hood?
Ryan - I tried to keep costs down, thats why we used water jetting instead of milling them. I originally profiled them with a laser cutter, but the machine tops out at about 1/4" thickness... the water jet can cut thicker materials. One cost I am absorbing is the profiling and engineering time here. The cost to us to write the CNC program for those shapes is already covered by us for you.
Ryan - I tried to keep costs down, thats why we used water jetting instead of milling them. I originally profiled them with a laser cutter, but the machine tops out at about 1/4" thickness... the water jet can cut thicker materials. One cost I am absorbing is the profiling and engineering time here. The cost to us to write the CNC program for those shapes is already covered by us for you.
12-24-2008, 05:24 PM
#41
Rennlist Member
its a low pressure zone as i had mentioned before, it is actually the lowest pressure zone in the hood area. if you put some tufts on it, you will say that the air is venting out, rather than "raming" in. You may have well have an intake inlet in the rear tail lights!! 
they look cool though!
the high pressure zone is in the nose of the car. ive put a very senstive pressure sensor in all areas of the nose and intake inlets. It is in fact the highest pressure zone, besides the base of the windshield. I get my air from both!
mk
they look cool though!the high pressure zone is in the nose of the car. ive put a very senstive pressure sensor in all areas of the nose and intake inlets. It is in fact the highest pressure zone, besides the base of the windshield. I get my air from both!
mk
12-24-2008, 05:32 PM
#42
Race Director
its a low pressure zone as i had mentioned before, it is actually the lowest pressure zone in the hood area. if you put some tufts on it, you will say that the air is venting out, rather than "raming" in. You may have well have an intake inlet in the rear tail lights!! they look cool though!
the high pressure zone is in the nose of the car. ive put a very senstive pressure sensor in all areas of the nose and intake inlets. It is in fact the highest pressure zone, besides the base of the windshield. I get my air from both!
mk
they look cool though!the high pressure zone is in the nose of the car. ive put a very senstive pressure sensor in all areas of the nose and intake inlets. It is in fact the highest pressure zone, besides the base of the windshield. I get my air from both!
mk
Do you have this graph for an S4? I wonder if it is much different?
12-24-2008, 07:11 PM
#44
Rennlist Member
its going to be pretty much the same. here is the graphical representation of the same areas with the S4. it basically shows, anything around the hood is in a low pressure zone compared to the nose and base of windshield. anything cut in the hood is basically going to be a vent outward for air entering from the nose.
Mk
Mk
12-24-2008, 11:36 PM
#45
Developer
Thread Starter
Mark, I disagree with your evaluation of his hood scoop. I'm treating it like a NACA duct in my mind.
Yes, it WAS a high-velocity, low pressure area before. But not any more - he has effectively added frontal area to his car and placed the air intakes right in it.
I cannot see from the pictures, but if it has a floor, sidewalls, and is sealed to the hood, it will work. Sure, of no value at most street speeds, but if his envelope is sealed, it should develop a positive pressure at speed.
Yes, it WAS a high-velocity, low pressure area before. But not any more - he has effectively added frontal area to his car and placed the air intakes right in it.
I cannot see from the pictures, but if it has a floor, sidewalls, and is sealed to the hood, it will work. Sure, of no value at most street speeds, but if his envelope is sealed, it should develop a positive pressure at speed.
Last edited by Carl Fausett; 12-25-2008 at 12:10 AM.