Crawford Cast Plenum - Info, pics, links, etc.
01-23-2005, 09:18 AM
#141
Originally posted by BOOFER7
OK but where are the gains? high end or low end?
OK but where are the gains? high end or low end?
01-23-2005, 09:19 AM
#142
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Originally posted by BOOFER7
OK but where are the gains? high end or low end?
OK but where are the gains? high end or low end?
http://www.crawfordz.com/pics/adamdy...ckvsplenum.jpg
01-23-2005, 09:24 AM
#143
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Originally posted by BOOFER7
I just dont see it. Why wouldnt Nissan design that in from the beginning?
I just dont see it. Why wouldnt Nissan design that in from the beginning?
01-23-2005, 10:08 AM
#144
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01-23-2005, 10:54 AM
#145
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Originally posted by BOOFER7
Has anyone ever figured out, if any, the HP gains vs. cost analysis? Where are the gains (if any) at the high end? low end?
Im trying to be positive here...
Seems like alot of work/finacial investment for minimal results...
Has anyone ever figured out, if any, the HP gains vs. cost analysis? Where are the gains (if any) at the high end? low end?
Im trying to be positive here...
Seems like alot of work/finacial investment for minimal results...
http://crawfordz.com/pics/adamdyno-stockvsplenum.jpg
01-23-2005, 02:17 PM
#148
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I've just heard that the 1/4 inch spacer between the upper and lower plenum has been dynoed. The results were based on the same car,same day, same dyno,= 6.5 more hp than the crawford v5 (WOW). He will be posting up the dyno soon on the other 350z forum.. And yes you get to keep the stock strut bar.. Decisions, Decisions..
screaminz
screaminz
01-23-2005, 07:03 PM
#151
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Originally posted by screaminz
The dyno will be posted tomorrow on 350zmotoring so we've been told. I'm going to buy one or the other very soon..
screaminz
The dyno will be posted tomorrow on 350zmotoring so we've been told. I'm going to buy one or the other very soon..
screaminz
Come on dude... welcome to my350, but there is a difference between realism and nonsense.
01-24-2005, 12:23 AM
#152
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no no, this was tested on a G. it will not fit with the stock Z strutbar.
but on the dyno, it seems that at lower rpms, it kept up with the V5, but at higher, it actually exceeded the V5 by 5hp or so. interesting. i wonder what both together would do.
any chance of making a higher plenum crawford?
but on the dyno, it seems that at lower rpms, it kept up with the V5, but at higher, it actually exceeded the V5 by 5hp or so. interesting. i wonder what both together would do.
any chance of making a higher plenum crawford?
01-24-2005, 12:53 AM
#153
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Originally posted by nuttyprof
no no, this was tested on a G. it will not fit with the stock Z strutbar.
but on the dyno, it seems that at lower rpms, it kept up with the V5, but at higher, it actually exceeded the V5 by 5hp or so. interesting. i wonder what both together would do.
any chance of making a higher plenum crawford?
no no, this was tested on a G. it will not fit with the stock Z strutbar.
but on the dyno, it seems that at lower rpms, it kept up with the V5, but at higher, it actually exceeded the V5 by 5hp or so. interesting. i wonder what both together would do.
any chance of making a higher plenum crawford?
01-24-2005, 04:02 AM
#154
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Originally posted by nis350ztt
They are trying the V5 and spacer, it fits so far, I believe they are doing a dyno soon to see if it gains even more.
They are trying the V5 and spacer, it fits so far, I believe they are doing a dyno soon to see if it gains even more.
Do NOT be mislead.
Hell, the version 5 BARELY fits under a Zs hood.
01-24-2005, 04:20 AM
#155
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Originally posted by PhoenixINX
A Crawford v5... with ANY spacer will not clear the stock strut bar.
Do NOT be mislead.
Hell, the version 5 BARELY fits under a Zs hood.
A Crawford v5... with ANY spacer will not clear the stock strut bar.
Do NOT be mislead.
Hell, the version 5 BARELY fits under a Zs hood.
Not under the strut bar, I meant if fits under the hood so far. The spacer is 0.25".EDIT:
Pic of it installed...
Quote: "Summary:
I know that we need more data, but the stripped threads put a wrench in our plans. What's probably going on, is that the spacer helps by changing where the air is directed coming from the plenum's neck. In stock form, the air is directed at the "hills" on the lower plenum. With a spacer, the air flows above those hills, and has a less restricted path. I'm now running the Crawford with a 1/4 spacer. There's no clearance problems on the coupe with this configuration. What I'd like to do is get the car back on the dyno in this config, but I have to fix the stripped threads first."
BTW, i'm not trying to say this is a better product. I plan on getting the Crawford cast plenum and this spacer to maximize airflow
.
Last edited by nis350ztt; 01-24-2005 at 04:27 AM.
01-24-2005, 04:49 AM
#156
Cutout pics
Went to the shop yesterday morning to help figure out some particulars on the plenum production. While watching some of the assembly I saw some ideas to help iterate what goes on inside of the plenum.
(Dont try this at home, unless you want to hack up a lower plenum)
Stock:
Cast Crawford:
Stock:
Cast Crawford:
Stock:
Cast Crawford:
Now, keep in mind that the runners were cut off and get even larger and more bottlenecked the further you get from the center. To illustrate this, here are some pictures to compare the cut piece used above in the pictures and a complete piece.
(Dont try this at home, unless you want to hack up a lower plenum)
Stock:
Cast Crawford:
Stock:
Cast Crawford:
Stock:
Cast Crawford:
Now, keep in mind that the runners were cut off and get even larger and more bottlenecked the further you get from the center. To illustrate this, here are some pictures to compare the cut piece used above in the pictures and a complete piece.
01-24-2005, 05:28 AM
#157
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Well, to me it looks like a spacer would do a very similar thing as the plenium. Did you guys try to do any dyno runs or flowbench tests on the lower plenium with top of the runners cut off? That way they would be shorter and help with power at the top of the curve. Something that I'm sure few people would want with cammed engines. Also there would be less distance between the throtle and the cylinders aiding in throtle response. It might also increase the plenium capacity as well.
I think this is something that might have been done to the 2005 Track engine since there is talk about shortening the intake runners.
I think this is something that might have been done to the 2005 Track engine since there is talk about shortening the intake runners.
01-24-2005, 05:46 AM
#158
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Originally posted by nuff
Well, to me it looks like a spacer would do a very similar thing as the plenium. Did you guys try to do any dyno runs or flowbench tests on the lower plenium with top of the runners cut off? That way they would be shorter and help with power at the top of the curve. Something that I'm sure few people would want with cammed engines. Also there would be less distance between the throtle and the cylinders aiding in throtle response. It might also increase the plenium capacity as well.
I think this is something that might have been done to the 2005 Track engine since there is talk about shortening the intake runners.
Well, to me it looks like a spacer would do a very similar thing as the plenium. Did you guys try to do any dyno runs or flowbench tests on the lower plenium with top of the runners cut off? That way they would be shorter and help with power at the top of the curve. Something that I'm sure few people would want with cammed engines. Also there would be less distance between the throtle and the cylinders aiding in throtle response. It might also increase the plenium capacity as well.
I think this is something that might have been done to the 2005 Track engine since there is talk about shortening the intake runners.
01-24-2005, 06:01 AM
#159
Originally posted by nuff
Did you guys try to do any dyno runs or flowbench tests on the lower plenium with top of the runners cut off?
Did you guys try to do any dyno runs or flowbench tests on the lower plenium with top of the runners cut off?
Who makes this spacer you guys talk off?
Thanks!
01-24-2005, 06:18 AM
#160
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Originally posted by VandyZ
Yes . . .trust me, you dont want to modify the lower plenum. It has been tried several ways with undesirable results.
Yes . . .trust me, you dont want to modify the lower plenum. It has been tried several ways with undesirable results.