Various interesting things ...
But deffective rods can also break on NA cars, although less but I friend of mine broke a rod on an NA 350Z with just intake and exhaust, he has done a lot of autox over the last 1 1/2 years.
Originally posted by Lorca@Z1
Thats a great idea and it would be a tremendous help to us if you coulod locate a facility that would do an analysis that was not cost prohibitive.
Thats a great idea and it would be a tremendous help to us if you coulod locate a facility that would do an analysis that was not cost prohibitive.
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Joined: Nov 2002
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From: asdf
Originally posted by gq_626
Is that manifold cracked through? Or just a surface crack. I am really surprised to see a crack in a cast iron manifold. You normally dont see that.
Either way, is the manifold repairable? Or do you need to get a new one from Greddy?
Is that manifold cracked through? Or just a surface crack. I am really surprised to see a crack in a cast iron manifold. You normally dont see that.
Either way, is the manifold repairable? Or do you need to get a new one from Greddy?
Originally posted by 350z_taquito
you obviously haven't seen any high mileage cast iron turbo manifolds. they crack all the time.
you obviously haven't seen any high mileage cast iron turbo manifolds. they crack all the time.
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Joined: May 2002
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From: Atlanta
Originally posted by gq_626
<snip>
One thing Lorca. I had the opportunity to dyno my car before and after my Crawford plenum installation. No other changes to A/F ratios were made. With the Crawford plenum, my car was running roughly .5-1.0 A/F points LEANER than with the stock plenum. If no changes were made after installating the Crawford plenum, its possible that a lean condition would exist. <snip>
<snip>
One thing Lorca. I had the opportunity to dyno my car before and after my Crawford plenum installation. No other changes to A/F ratios were made. With the Crawford plenum, my car was running roughly .5-1.0 A/F points LEANER than with the stock plenum. If no changes were made after installating the Crawford plenum, its possible that a lean condition would exist. <snip>
I figure that the Nissan engineers are aware of the fact that the front cylinders get less air than the others. For emmissions, it seems likely that the front cylinders would get less gasoline relative to the other cylinders for any given throttle position/RPM.
Now, suppose you fix the air flow problem with a new plenum. The ECU will still be sending less fuel to the front cylinders. There is no way for the MAF to figure out that the air flow has been balanced. This results in a lean condition.
Again this is just a theory. It should be easy for someone with the right tools to check if the injectors are being held open for different durations.
--
Jeff
cast ones tend to crack if you run gobs of boost or if you run lean...you can always tell the lean ones by the white spots
as for the plenum, I have never seen a flowbench chart showing what has been accepted as fact about the front cylinders. Im , not dismissing it, as it's obvious the upper plenum slops, but I don't know how big a deal it truly is
as for the plenum, I have never seen a flowbench chart showing what has been accepted as fact about the front cylinders. Im , not dismissing it, as it's obvious the upper plenum slops, but I don't know how big a deal it truly is
lol.. the quality of greddy products.. just like when when my greddy evo rusted from the inside out.. and my 2 weeks old profec B spec II solenoid broke and my greddy boost gauge that was completely off.. and on top of that crappy customer service.
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