No, I wont believe ...

150 pulls at 18psi on a stock block ??? With Turbo's??? If with turbo's.... is this some new brand of "VOODOO" motor. Did they run that motor over 3000 rpms

My motor is FULLY built with TT...and even then I am nervous about running my motor at that psi....

Where did you get this info?? Many name brand shops have pushed the limit of the stock motor and posted the results (GTM, MRC...just to name a few) and as far as I can remember...none of them came that close in PSI's.

Please dont reply " Its all in the tune" .... because not even a tune can help the rods at that psi level.


To the OP.....the standard safe high PSI is 8 to 9 psi with the right tune. 10 is pushing it even if tuned correctly.

 

Go to the Mid-Atlantic section on my350z.

 

Why should I go there? No matter where you tell me to look....18psi on stock block aint happening

Read through this thread and you will see the average for Stock Block on boost.
http://www.my350z.com/forum/showthre...on+stock+block

Trust me...If functiontuned could run a STOCK motor with turbo's at 18psi and have it last 150 runs on a dyno.....they would be the only shop in America. They would take out a TV and radio ad and have it on the front page of the Daily News for a year

 

[QUOTE=XKR]Why should I go there? No matter where you tell me to look....18psi on stock block aint happening

I believe that the guy whose car that is may be in that section on my350Z.

 

Many forget to correct for air temperature rise from compresssing air.
11F plenum increase will decrease the density by 1% of gross.

In theory 1.0 psi is 6.8% denser air, if there is ZERO temperature increase so a 62F air temp increase will zero out any gain from a 1.0 psi boost.
A 124F rise will zero out 2.0 PSI.

Even with great intercoolers [without nitrous cooling spray] lose 1 PSi due to flow restriction and never totally bring the air back to ambient temperature in plenum.

Then superchargers need 20-45 HP to turn them [how much boost is used to turn supercharger or overcome increated backpressure from turbos], so the first 2-3 [ even 4] PSI of super/turbocharger outlet boost just fades away, into nothingness, in the system overcoming the new restrictions and parasitics you created.

Always measure PSI in plenum along with plenum air temp to arrive at real world numbers.

http://books.google.com/books?id=0rY...hl=en#PPA36,M1

 

/\ So does Water/meth Injection increase Air Density?

 

I got it directly from Dave at FunctionTuned and from Nowell who owns the car.Now i could be mistaken and all the runs werent on 18psi which is probably the case...........so my fault.Try pming Dave at FunctionTuned to find out how many runs were made at each psi level.

 

I don't agree with the quote about superchargers/turbos taking 20-45 hp to create boost. Maybe superchargers do, but increased backpressure due to a turbo does not mean that the first 3-4 psi is offset. You can definitely feel a difference between an NA engine and a Turbo'd engine at low boost levels. Back pressure does act as a parasitic load but you will only find it robbing that much psi at high boost levels. Plus, with an oversized exhaust, at some point you need that back pressure to reach maximum power output.

 

You said the key word:average. Now don't take me the wrong way, if I was to install my GReddy TT today, I would not go pass 9 PSI.

However I believe the guys that also made this happen.
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AWD 350Z

The only other AWD 350Z I ever seen was the that JUN Auto did, which BTW is in Japan. (http://www.superstreetonline.com/featuredvehicles/130_0705_jun_auto_nissan_350z_r/index.html)Making function:TUNED the first in the US

 

Thank you city as they can do some awesome **** at FunctionTuned.

 

No offence...but I would be more impressed with seeing the 18psi Turbo'ed Stock motor on a dyno.

Making a G/Z into a 4wd with an already developed system that you can buy stock on a sedan does not impress me. To me that's like taking the 19" rims off a newer model and putting it on a older model that comes with 16' rims..... Plus, you are taking a medium weight car and adding weight to it....which will take more of your reserved power to get it going.

Yes its cute to say you have one of the first 4wd Z/Gc....but I am spending my money to take off weight not add weight.

So back to the topic....I will wait for Sharif ( Forged Performance) George ( GTM) Jeremy ( performance Factory ) Julian (MRC) Mark ( SGP) to come on here and explain to me why they were not able to run a Stock Motor at 18 psi with turbo 's for over 150 runs .I am also curious...did they also run it on the street at that psi? Man !!! I would pay to see that !

All the tuners above have tested the limits of the VQ motor and all have come to the same conclusion of its limits. No matter what....there is always someone that will say that they have the secret for going over the norm.....VRT comes to mind !

 

With the AWD 350Z, I was proving the point that function:TUNED has done something that nobody has done before, and they didn't "take out a TV and radio ad and have it on the front page of the Daily News." The fact is not many know about it at all. Fitting a G35X drivetrain into a 350Z is not exactly the most easiest thing to do.

Anyway here's the link to Nowell's Z @ 18 PSI --> Function:TUNED – 563.7 DynoDynamics (REAL) RWHP - STOCK MOTOR!
BTW: Sharif and George already seen video and read the above thread.

Also I think the whole VRT thing is uncalled for. Unlike them, function:TUNED stands behind their work. As you know they ever offer a Written 12 Month Stock Motor FI Warranty. Here's the link. Function:TUNED STOCK MOTOR FI Warranty Program

 

Here is my question......Will FunctionTuned install and warranty a 18 psi stock motor? The answer to that question will set this all straight. All Hype to get your attention. Nothing wrong with that...but some of us know that in the real world....the same thing that happened to GTM's motor would happen to FT motor.

Stillen offers a warranty on their setup also. Do you see the restriction that apply?

GTM took a 500+ TT stock motor to the track and it did not last. With that...we saw the true limits of the stock motor in the REAL WORLD !!

If a stock motor can handle 18psi.....why build the motor? Why not save thousands of dollars and down time and just slap on some turbos? Hell....I can run 19 to 20 psi on mine all day but rearly go over 12 psi....if I could have had a stock motor like this done for me I would have just run it at below15 psi and be happy !!

Come on guy....if this would really last a day on the street.....there would be ZERO built motors after this was proven to work.

BTW: my comment about VRT was in no way to demean FT. I know FT is a great shop who does real work.



LOL....talking about VRT....do you know that they were one of the first to start the 4wd project before going down hill?

Trust me....all it takes to do that project is $$$$. Matter of fact...I just sent my car back to FP to install 12piston fronts 6 piston rear calipers, cosworth, meth and a few other things I wont mention at this point...and what I am spending will exceed the price of installing that 4wd system...so no...its not that other shops cant do it...the interest is not there.

Look what Jeremy at PF is doing !!! G56 Now thats a big deal.

 

The quick answer to you your question in no.

But this started when you said:

All I did is provide you with my info, to show it's not impossible like you making it seen. Now let me clear some things up: 150+ dyno pulls were not all at 18 PSI. From the base line of 364.4 WHP (6 PSI) to 423.1 WHP (9 PSI) there were 50+ pulls. From 423.1 WHP to 490.4 WHP (12 PSI) was about 30 more pulls. From 490.4 WHP to 541.4 WHP (14.1 PSI) there were 40+ pulls. And finally from 541.4 WHP to 563.7 WHP (18.9 PSI) there were 30 or more pulls.

It's to my understanding that function:TUNED only did all of this as a experiment to see what the MAX power output of a stock block was before certain failure. I'm petty sure Juan, Dave and Nowell know it was not going to last long at.


As I told the OP, 10 PSI is the highest average boost level. As for me and my GReddy's I will have no plans to have any tune above 9 PSI.