Finally got the G35 dyno'd after about 1200 miles on the Vortech SC with stock pulley and no other mods. Before any fine tuning, my engine pulled at 360 rwhp and 300 ft lbs torque. After tuning, which required just a bit of leaning out above 5800 RPM or so and minimal other touches (no changes to the factory SS box timing), the engine pulled 372 rwhp with 305 ft lbs torque. Furthermore, the torque curve was amazing flat, peaking out around 5200 but only coming down to 300 at redline. The HP curve was almost a straight line at 45 degrees right up to full power at redline. With the factory stock pulley, the blower made 8.7 lbs of boost at redline (6500).

What blew my mind was the almost perfect tune straight out of the box. Over about 5800 or so the AFR dropped to 10.8 and bringing it up to 11.5 added about 5 HP. I think Vortech has really got it right for the 2003 G35 coupe. My anxieties about having my engine flogged to redline over and over (about 8 pulls total) were needless. The engine happily screamed to redline, absolutely smooth as silk. If nothing else, the dyno'ing showed me I had been driving way too conservatively before.

My car was tested on a new generation Dynapack at Avalon Racing. The dyno was impressive--water cooled, computer controlled and simultaneously monitoring several functions including load at the rear wheel hubs. When the pedal is floored,the Dynapack takes over and controls the rate of RPM increase by varying the wheel resistance to keep everything totally smooth and the load constant. There are two units sitting on the floor that bolt onto the rear wheel hubs through a beefy connection on which the car sits (the car is jacked up a bit and then lowered down once the connections are tight). The readings were highly consistent from pull to pull.

I'll be receiving an e-mail of the charts and will post them when I get them.

Once again, these were amazing numbers with minimal fine tuning and a totally stock system.

 

Congrats!!!!!!!!!!!!!!!

Where are the dyno pics???

 

Hey check out this thread, its about Vortech potential problems.

http://www.350zmotoring.com/forums/s...ad.php?t=24657

 

That guy was running a 10 lb pulley on a stock engine. Is he crazy?

 

Do you have a copy of your map?I have a 03 G also. I just installed mine and the car is fouling plugs cause its soo fuggin rich! Car ran great first 160 miles but after that it started missing under boost. I also have the injen exhaust so I dunno if that fugged it up or not. Im going to dyno soon but would like something to get me by for now!

 

Nice numbers! Congrats! Sure have been a lot of posts shared since you got started. I know you are going to enjoy your G35 with the Vortech.

 

I'll be posting the chart when I receive it by e-mail. I don't have the map but you've really got to have your own unique tune, esp. with your mods. The rich AFR is readily fixable and you'll get gobs more HP by doing that.

 

Great numbers. Just proves how critically important it is to find a knowledgable and experienced tuner when dealing with F/I applications. The guys at Avalon have always impressed me. Congrats on the terrific numbers on an otherwise stock car.

 

My car was tested on a new generation Dynapack at Avalon Racing. The dyno was impressive--water cooled, computer controlled and simultaneously monitoring several functions including load at the rear wheel hubs. When the pedal is floored,the Dynapack takes over and controls the rate of RPM increase by varying the wheel resistance to keep everything totally smooth and the load constant. There are two units sitting on the floor that bolt onto the rear wheel hubs through a beefy connection on which the car sits (the car is jacked up a bit and then lowered down once the connections are tight). The readings were highly consistent from pull to pull.

Gersteinp...Great numbers on a stock set up .A Dynapack sound alot like a mustand dyno .Only allowing a set amount of rpm every second .

 

Thanks to all of you for the thumbs up! A couple of other things I did yesterday at Avalon:

1) Replaced my 1 1/2 year old brake fluid (DOT 3--stock) with DOT 4 for the track. I'll be taking the G to New England Int'l Speedway on 4/11 and 12 for a "driver safety course" through the Audi Club.
2) Had Jeff, Avalon's top level mechanic, fabricate a rectangular hole in the center of my front bumper just under the license plate and right in front of the intercooler for WAY better ventilation. It took him about 10 minutes. I'll post a picture soon.

Once again, I can't say enough good about Avalon Racing in Londonderry, NH. Met Paul Gasparola yesterday for the first time. He's the owner, a race car driver (now does GT-2 and some limited kind of Formula 1), and owner of several Z's. The one I saw yesterday was a very trick-looking track model in a gorgeous deep, dark, metallic purple. It was truly awsome to behold. As nice as the G35 coupe is, I wouldn't park next to him--my car would definitely look ghetto in comparison.

 

WOuld like to see the pics of the bumper . I have 2 openings were the plate should be . Dont have to have a plate on the front , well they dont bother any one about it anyway

 

Here goes.

[IMG]

 

Another view of the bumper slot.

 

first one has 2 holes and second has 1 bigger one . Must have made it bigger . Looks good

 

Think you're mixing me up with someone else. This is the first and only slot in my bumper.

 

The first shot ....LOOKS ....like there is 2 openings....but I relooked at it . Its the intercooler that makes it look that way

 

If you click on the images you can open them up in a larger window with much better detail.

 

All right-- here are the dyno charts. On the standard HP and TQ chart, the dotted lines are before the tune, and the solid after. Notice how close the factory settings were to perfect.

The waviness of the AFR vs boost graph between 5-6K RPM is to some degree an artifact of the spread out y-axis.

Regarding the "flywheel" headings, these are actually rear wheel readings with total equivalency to a roller dyno except for much better repeatability. I had about 8 pulls that were just about identical in their max numbers. Here's some info just sent to me by Giles, the owner of Holyroller Dyno in New Hampshire. They have a Dynapack that, being portable, they can truck to any location:

Hi Paul,
The numbers are wheel horsepower and torque. We used a correction ration of 1:1 instead of 1.21:1 hence giving us actually numbers at the wheel hubs. There is no parasitic loss factors etc. The numbers on the plot is exactly what was delivered to the dyno hubs. This is much more accurate and repeatable a reading since tyres heat, cool, deform and slip. I would say that the folks that are making 360 rwhp have poor tuning since yours is very mildly tuned. My dynapack is one of the latest generation of dynapacks that does not read high. If you check out some of the other plots on the website you will see that they are almost exactly the same as folks have been seeing on a DynoJet under ideal conditions. This number of accurate and repeatable and SAE adjusted on the dynapack.

It was great to meet you and itÃÔ a very nice setup you have.

If you want any more combinations of graph just let me know.

Thanks again,
Giles

 

Asked Giles specifically about the irregular AFR curve between 5-6K RPM. His answer, just received and the attached chart comparing torque and AFR before and after:

Date: Mon, 28 Mar 2005 13:24:42 -0500
To: Giles Gilbert <giles@holyrollerdyno.com>
Subject: Re: Message from G35 owner

Giles-- That's fantastic. Dynapack is definitely the way to go. I'll give you guys a well-deserved plug on the forums.

I've got a question about the AFR--should it have been a bit flatter in the 5-6000 range or do you think the tune was just right?

Thanks--

We hit the same issue with AdamÃÔ 350Z. It appears totally based on the design of the engine. We ended up either really lean or a little rich. The difference between the really lean and a little rich was tiny in the amount of torque so really not worth wasting time and money over .... Attached is a plot showing exactly the difference during your dyno session.

Giles
Holyroller Dyno