I believe he is serious and it sounds like Mr. Master Tech/Nissan Assoc Editor is also serious. WTF...?are you incredulous at the bad news or the question...?if the question, then how about deigning to enlighten the rest of the ill-informed(like me and Mr. Master Tech etc.)

 

FastIntentions; are you still there/here...?would love to hear from you...

 

First of all on just about every gas powered engine, there is a split second where an intake valve and exhaust valve are open at the same time. This is due to the overlap of the cam.

When the exhaust travels back upstream and re-enters the cylinder head, this is known as reversion. Typically this type of reversion is only evident in HIGH BOOSTED applications. For this this reason there are specific grinds for cams on turbocharged vehicles.

If you see any reversion in a NA or Supercharged application, it is typically due to one of two things.

1. A header that does not scavenge properly.

2. A poor flowing or better yet clogged exhaust system.
Ex: If your catalytic converters were clogged shut as the exhaust would escape from one cylinder, it would back up and enter another cylinder while the piston is on one of the downward strokes.

So installing high flow cats will more than likely eliminate reversion.

The oil consumption problem in the older 350/G35 VQ engines has nothing to do with cam timing or reversion. It was most likely due to ring flutter or excessively loose engine tolerances.

Tony

 

yea, i wasn't sure if he was me or the problem or what. not gonna even say anything more bfr this thread goes bad. all good ppl, just tryin to find an answer.

thanks genome, ur allllrriigghttt!

 

Tony; those letters sure are big. I do not mean to annoy you nor suggest that you're clairvoyant - but why do you think Mr. Master Tech/Nissan Assoc Editor would offer such a caution?...seems like he has nothing to gain...WTF...just a DUMBA$$...?

 

Thanks TONY!

I'm gonna email the owner of a local performance shop in my area that specializes in working on the Z's and G's (they also are a sponsor of our local G club) and see what he thinks with all his experience workin on VQs. Just tryin to get a second opinion from someone who DEF won't have a bias on this subject.

(Not to say Tony does in his post, just want one more opinion to feel all warm and safe inside, you know? LOL)

 

I wish the Tech who told me this could post here because i am pretty sure i did not quote him entirely or accurately, but baisically the jist was to stay away from after market HFCs.
I do remember another phrase he used.... "scoring the cylinder walls" ?

I'm sure he has nothing to gain by telling me to stay away since he, himself, has a G with many mods. So maybe just misinformed or a genius!

 

We have been doing this for a long time. Just to give you a rundown of what we specialize in here at Fast Intentions:

300ZX 1990-1996
350Z 2003+
G35 2003+
G35 Sedan 2007+
G37
BMW 335i
BMW Z4
Audi A4
Audi S4- B5,B6,B7 platforms
Porsche 996 TT/NA
Bentley Continental GT
Mitsubishi EVO X

Every one of those cars above, we make production system for. Not to mention the hundreds of cars we have done custom work on as well as the Ultima GTR and Ferrari F430i that we twin turboed. The point I am trying to make is, we have been in the game for a while and not to say this master tech doesn't know what he is talking about, but he might be jumping to conclusions without any factual evidence on the G37...

Tony

 

it's pretty easy to sign up; he's a G owner, after all, and somebody is likely to learn something (well,maybe...I'm sure getting slower every day)

 

Honestly, I would like to hear his theory and if it more then just a theory I would like to see his evidence on the G37 to be specific...

Thanks, Tony

 

^^ yea he is a member over on driver, we give him a hard time cuz his PM box is always full and he never replies anymore.

His family grew, so now his time is spent elsewhere if you know what i mean. He is on AIM tho all day during the week, i'll try to catch him and post back with an update from him AND the owner of the local performance shop here.

 

I'm not at all mechanically-inclined and was feeling like I made a huge mistake when I ordered from your company this week. I had told your salesman about my level of ignorance and asked for assurances that I was not risking voiding my warranty nor risking damage to my already great fun vehicle...and he assured me that I was not risking anything of the kind - not in any way...perhaps you can understand why a mechanical goober like me is a bit freaked...?or not...

 

Of course i can see your level of concern. It is a natural instinct to wonder. However, this master tech I keep hearing about has a G35 not a G37.

I bet he does have an oil consumption issue because a while back there were a few specific years for the G35 and 350Z where they would burn excessive oil. Now correct me if I am wrong, there has been no evidence linking this problem to the HR motor in any way shape or form.

With this said. I know from past experience with the G35 the oil consumption issue was not related to high flow cats. Now since the vehicles were already burning oil by relieving back pressure and installing high flow cats it was becoming more noticeable due to the fact that the high flow cats were less restrictive. So therefore the oil was making its way out of the exhaust tips instead of being trapped in front of the stock catalytic converters.

Once again the oil consumption issue did not increase by installing high flow cats, it only became More noticeable to the human eye...

Tony

 

I sure want you to be right since I just spent a couple of grand on your system...no doubt, huh...?

 

Gotcha, just got more noticeable on a motor which ALREADY had or would have had the consumption issue anyway due to it's manufacture flaw or whatever you wanna call it.

So i guess some could mistakingly attribute HFCs as a contributing factor if they had that installed and then later saw consumption.

In the end, only time will tell.