AAM SPEC Plenum Space !DYNO RESULTS!
You are all missing the point.
AAM did NOT have these made in China and they are obviously NOT mass producing them. Sure if they made 10,000 they could get them for cheap as hell... but even if they sold them for only $75 not even 500 of them would sell. You guys are crazy if you think that stuff sells in such mass.
AAM did NOT have these made in China and they are obviously NOT mass producing them. Sure if they made 10,000 they could get them for cheap as hell... but even if they sold them for only $75 not even 500 of them would sell. You guys are crazy if you think that stuff sells in such mass.
Last edited by phunk; Feb 2, 2005 at 04:36 PM.
All this talk about how much things cost to produce is pretty much a waste. Why? It's called SUPPLY AND DEMAND. This especially applies to new products, where there is limited availability and everyone wants one, then they will sell at a premium because the market will support that. It also allows the people that spent time in R&D to recoup some of that cost. Once all the initial hype is over and more companies have similar products, prices end up dropping to more realistic long term levels. Simple economics at work here, nothing more
So stop all the whining and go buy the damn gasket spacer if you can't wait =)
So stop all the whining and go buy the damn gasket spacer if you can't wait =)
Originally posted by phunk
You are all missing the point.
AAM did NOT have these made in China and they are obviously NOT mass producing them. Sure if they made 10,000 they could get them for cheap as hell... but even if they sold them for only $75 not even 500 of them would sell. You guys are crazy if you think that stuff sells in such mass.
You are all missing the point.
AAM did NOT have these made in China and they are obviously NOT mass producing them. Sure if they made 10,000 they could get them for cheap as hell... but even if they sold them for only $75 not even 500 of them would sell. You guys are crazy if you think that stuff sells in such mass.
ya, you guys that need everything now hurry up and buy this damn gasket. that is what i have learned...its always more expensive when something first comes out....see what this thing cost a year from now and you will see quite a difference
Originally posted by phunk
You are all missing the point.
AAM did NOT have these made in China and they are obviously NOT mass producing them. Sure if they made 10,000 they could get them for cheap as hell... but even if they sold them for only $75 not even 500 of them would sell. You guys are crazy if you think that stuff sells in such mass.
You are all missing the point.
AAM did NOT have these made in China and they are obviously NOT mass producing them. Sure if they made 10,000 they could get them for cheap as hell... but even if they sold them for only $75 not even 500 of them would sell. You guys are crazy if you think that stuff sells in such mass.
Originally posted by g35irish
I'm not sure the slope has been clearly proven to be a poor design. Obviously firms like Crawford, Kinetix, and APS have gone with a flat or non-sloped design, but some of the work being done by the "spacer" suppliers suggests the front intake runners simply need more room, not that the plenum needs to be semetrical. Flow bench testing has shown that the forward cylinders are incapable of receiving the same volume of air as the rear cylinders by 5-10%. However, we aren't driving flowbenchs. It is possbile, actually likely, that the flow bench does not adequately represent actual engine running conditions. A 5% airflow increase on a flow bench does not equal a 5% increase in power. If it did the intake runners would be enormous as well as the primary header tubing.
I have a Superflow 600 and have done a lot of induction/exhaust work for drag racing. Gains on the flow bench don't always equal horsepower gains..in fact, sometimes it can be just the opposite. If in fact the front cylinders are restricted under running conditions, it is possible that the problem could be cured by either the spacer (sloped or flat) and/or a plenum (sloped or flat). The trick is to eliminate as much pressure drop as possible under atmospheric conditions. There is a point of diminishing returns however. The rules change a little for FI guys.
I look forward to trying the spacer (both designs).
I'm not sure the slope has been clearly proven to be a poor design. Obviously firms like Crawford, Kinetix, and APS have gone with a flat or non-sloped design, but some of the work being done by the "spacer" suppliers suggests the front intake runners simply need more room, not that the plenum needs to be semetrical. Flow bench testing has shown that the forward cylinders are incapable of receiving the same volume of air as the rear cylinders by 5-10%. However, we aren't driving flowbenchs. It is possbile, actually likely, that the flow bench does not adequately represent actual engine running conditions. A 5% airflow increase on a flow bench does not equal a 5% increase in power. If it did the intake runners would be enormous as well as the primary header tubing.
I have a Superflow 600 and have done a lot of induction/exhaust work for drag racing. Gains on the flow bench don't always equal horsepower gains..in fact, sometimes it can be just the opposite. If in fact the front cylinders are restricted under running conditions, it is possible that the problem could be cured by either the spacer (sloped or flat) and/or a plenum (sloped or flat). The trick is to eliminate as much pressure drop as possible under atmospheric conditions. There is a point of diminishing returns however. The rules change a little for FI guys.
I look forward to trying the spacer (both designs).
Well, only issue there is that as far as I am aware Nissan ecu does not have individual injector control or knock control...it maps all cylinders at once.
you are right about the flow bench not always netting you gains...the most important thing is minimizing areas of pressure drop (of which there are several in the stock plenum), as well as increasing the velocity of the air as it moves from the plenum to the heads
you are right about the flow bench not always netting you gains...the most important thing is minimizing areas of pressure drop (of which there are several in the stock plenum), as well as increasing the velocity of the air as it moves from the plenum to the heads
How exactly is a $150 wheel more labor intensive than this spacer? The wheel is cast and painted...not hand assembled/welded and polished like some of the very expensive custom made wheels.
From what I gather, this spacer is made in house and NOT mass produced at some minimum wage foreign factory. If you don't want it, don't buy it. Why don't you have a coke and a smile + stop your whining!
From what I gather, this spacer is made in house and NOT mass produced at some minimum wage foreign factory. If you don't want it, don't buy it. Why don't you have a coke and a smile + stop your whining!
Originally posted by karlhungus
This guy is totally on target. I have always disputed the whole Crawford claim of air starved front cylinders. Do we really believe that in this age of extreme environmental and fuel economy regulation that Nissan engineers would intentionally allow 33% of the engine to be running rich? Until someone puts a multi-channel EGA on each exhaust header and maps the O2 content by cylinder over the RPM/load curve, any intake tweaking is pointless. Even if its true that 10% less air is getting to the front, Nissan has probably mapped the fuel to compensate. So if you increase the air to the front without an increase in fuel to those cylinders, you are lean and could be burning valves etc. Since a typical dyno only measures overal O2, the overlean cylinders would be masked over by the others. I would like to see someone do a full A/F analysis by cylinder on a stock motor. If the ratios are balanced (as I suspect it is), then its now a matter of trying to increase overall flow without upsetting the balance. That stock slope is there for a reason and its not to clear the hood.
This guy is totally on target. I have always disputed the whole Crawford claim of air starved front cylinders. Do we really believe that in this age of extreme environmental and fuel economy regulation that Nissan engineers would intentionally allow 33% of the engine to be running rich? Until someone puts a multi-channel EGA on each exhaust header and maps the O2 content by cylinder over the RPM/load curve, any intake tweaking is pointless. Even if its true that 10% less air is getting to the front, Nissan has probably mapped the fuel to compensate. So if you increase the air to the front without an increase in fuel to those cylinders, you are lean and could be burning valves etc. Since a typical dyno only measures overal O2, the overlean cylinders would be masked over by the others. I would like to see someone do a full A/F analysis by cylinder on a stock motor. If the ratios are balanced (as I suspect it is), then its now a matter of trying to increase overall flow without upsetting the balance. That stock slope is there for a reason and its not to clear the hood.
Originally posted by 03daytonablue
I'm feeling this also. If you look at the engine of some high end cars that make good power, they also have the same slope towards the end of the plenum, just more volume.
I'm feeling this also. If you look at the engine of some high end cars that make good power, they also have the same slope towards the end of the plenum, just more volume.
Hm, an engine builder was telling me, that the more and more a dynojet is used in a day, the higher the dyno numbers will read, because the hotter everything gets, the easier it is to spin the roller.
Example... Apex Motor sports has a dyno day, and a Cobra dynos... I do not remember the exact numbers, but the owner came out dissapointed with the results. he walked over to the engine builder who told me this, and he told the cobra owner to let some other people make some runs, and to jump on the dyno again. So he did this, and gains 20-30rwhp on the same exact day, not to much later. He just let the dyno get some use.
Just made me wonder if this could be the cause of you gaining HP after doing so many runs like that.
Just a thought is all..
Example... Apex Motor sports has a dyno day, and a Cobra dynos... I do not remember the exact numbers, but the owner came out dissapointed with the results. he walked over to the engine builder who told me this, and he told the cobra owner to let some other people make some runs, and to jump on the dyno again. So he did this, and gains 20-30rwhp on the same exact day, not to much later. He just let the dyno get some use.
Just made me wonder if this could be the cause of you gaining HP after doing so many runs like that.
Just a thought is all..
Regardless, it looks like a nice alternative to a whole new plenum.
Also wondering, the spacer would raise the point at which the throttle body inlet sits, could this cause issues with aftermarket intake fitment? maybe it is not enough of a raise to make a difference.
Also wondering, the spacer would raise the point at which the throttle body inlet sits, could this cause issues with aftermarket intake fitment? maybe it is not enough of a raise to make a difference.
This is true to an extent with my experience... the dyno will read higher and higher until its up to operating temp, and from there it appears to be very solid and consistent. Before running a car I will drive on the dyno for a few minutes at high speed to warm up the machine and then I get consistent results.
The 03 Cobras are very inconsistent run to run as they are very sensitive to temperature and heat soak... with proper cooling between the runs and lots of airflow over the engine you can get consistent runs with the higher numbers they produce... we typically go 3-4 min between each run with 4 massive fans on the engine.
Dynojets can also be suspect to operator error in which the car is mounted to the dyno, which can reduce HP from excessive drag and friction at the tires.
-Charles
The 03 Cobras are very inconsistent run to run as they are very sensitive to temperature and heat soak... with proper cooling between the runs and lots of airflow over the engine you can get consistent runs with the higher numbers they produce... we typically go 3-4 min between each run with 4 massive fans on the engine.
Dynojets can also be suspect to operator error in which the car is mounted to the dyno, which can reduce HP from excessive drag and friction at the tires.
-Charles
Originally posted by Jsn350Z
Hm, an engine builder was telling me, that the more and more a dynojet is used in a day, the higher the dyno numbers will read, because the hotter everything gets, the easier it is to spin the roller.
Example... Apex Motor sports has a dyno day, and a Cobra dynos... I do not remember the exact numbers, but the owner came out dissapointed with the results. he walked over to the engine builder who told me this, and he told the cobra owner to let some other people make some runs, and to jump on the dyno again. So he did this, and gains 20-30rwhp on the same exact day, not to much later. He just let the dyno get some use.
Just made me wonder if this could be the cause of you gaining HP after doing so many runs like that.
Just a thought is all..
Hm, an engine builder was telling me, that the more and more a dynojet is used in a day, the higher the dyno numbers will read, because the hotter everything gets, the easier it is to spin the roller.
Example... Apex Motor sports has a dyno day, and a Cobra dynos... I do not remember the exact numbers, but the owner came out dissapointed with the results. he walked over to the engine builder who told me this, and he told the cobra owner to let some other people make some runs, and to jump on the dyno again. So he did this, and gains 20-30rwhp on the same exact day, not to much later. He just let the dyno get some use.
Just made me wonder if this could be the cause of you gaining HP after doing so many runs like that.
Just a thought is all..


