Hey, I would like to see it too. If we can get enough people, we're planning another dyno day for May 7th. We'll have several stock cars there for baselines then we'll have modded vehicles to attempt to compare the gains of the mods. It's not 100% exact but it will give you a good idea of what mods work and what mods don't.

Now back to this cool spacer thread...

 

Id also be interested in seeing dyno #'s for the crawford package, from a region outside of FL G club (where crawford parts are sponsored). One of the highest HP NA G's i have seen is rugratcoupe's. Here is his list of complete mods thus far...

Polished CRAWFORD"Z"Plenum, R.T.Cats, NISMO Flywheel, NISMO Perf.Clutch, NISMO P.Plate, STILLEN Exhaust w/X-Pipe, INJEN Polished CAI, HYPER GROUND Wires, EIBACH PRO-KIT, NISMO SwayBars, JDM NISMO/RAYS/S-Tune 19" LMGT-4's, BRIDGESTONE S-03's. Cut Down Engine Cover, R.E.Short Shifter, PENNZOIL/LUCAS Synth.Oil, Snow/Aqua-Mist Water-Methanol Injection, U.R.Crank Pully, TechnoSquare ECU...
268.3whp/251.6tq. 1/4 13.86@101.38/60' 2.126 all #'s before W/M Inj.

With his mods he has almost 40 HP (assuming stock #'s to be ~230) but we can see this is mainly due to his 'stillen exhaust' which has been shown to have the highest HP increase of exhausts, Z tube/UR pulley are other mods included... now back to the thread!

 

guys you have to look at the detail.... 40WRHP at REDLINE is not 40WRHP at Peak.

The stock at Peak say puts 230 to the wheels, but at redline it is lower. The curve is falling off.

Breathing mods tend to extend the power curve at the high end / redline.
So as a simple (not claiming accurate) example....

A stock car puts 230 to the wheels at peak, but at redline it has fallen to 220
With the mods (assuming it supports the 40 at redline) it would be something like
say 260RWHP at peak, and still 260 at Redline... so you gained 30HP, but the redline isn't falling off so at that poiint you gained 40 over stock...

My SAE corrected dyno showed 252 RWHP (262 actual RWHP that day) and that is an AT, prior to me doing headers or pulley set (pulley set is on now and made a big diff - headers will wait till I have time) Based on other Dynojet SAE corrected numbers for the AT 220 - 224 is the expected stock RWHP, so I got 30 RWHP with Z-tube/Stillen Intake/3/8" Motordyne Spacer/Kinetix Cats, and Stillen X pipe exhuast. The pulleys should add a soild 6 - 8, and header at leaset that much again.

 

Hey sickone,

Just for kicks, take a look at the horsepower curve on a NA modded car. With the right mods they make power PAST the rev limiter. This was the ONLY reason that Doug got the TS ECU for his 350Z, at least that's what he told me. He wanted another 500 rpm to continue climbing in horsepower. I think you mean that torque falls off before redline, no?

Also, how often do you hear people talking about PEAK horsepower when talking about dynos? NEVER. People like to brag and say "look at me" so they ALWAYS give Maximum gains (where ever they occur). The numbers I was throwing around were the best possible gains at redline and according to my last dyno with just intake, plenum and cats I was increasing in horsepower up to the rev limiter. If you search for the thread "Central Florida Dyno Day Results Are In" you'll see what I'm talking about. PEACE!

Also, I've heard that Pulleys, Pressure Plates, Lightened Flywheels and Heavy Duty Clutches do not show gains on the dyno. Not claiming this is 100% accurate, but that's what I've heard. Are you planning on doing a Post Pulley Dyno?

 

When you reduce rotational mass with mods like a lightweight pulley, flywheel, and/or clutch, you benefit from having less unsprung weight and the engine is allowed to rev faster because it has less mass to get moving in order to turn the crank. There is only going to be a real difference in 1st, 2nd and maybe 3rd gear depending on the car. Once the car is moving faster and the rate of acceleration decreases the effects are minimal. This is why you see no gains on the dynos in 4th or 5th gears.

While they do make some power, do realize that these crank mods will also decrease usable torque down low in 1st and 2nd gears, and yes you can actually see the power gains and torque losses on a dyno. If interested in more details here is a thread with links to an excellent article that does an analysis of a lightweight flywheel/clutch on an M3:

http://my350z.com/forum/showthread.php?t=112956

IMO the G35 has VERY heavy pulley/flywheel/clutch components mostly to dampen vibration and sound, so I believe you can go a bit lighter without sacrificing much low end torque or street manners.

 

Neff: no I am absolutely talking about HP....
Look at some of the dyno sheets, the actual PEAK HP on a stock it is fading off at like 6200 (I am looking at Ian and Dennis polts from your glub)
At 6500 it is down 10HP from Peak

This tends to happen at high rpm with no breathing mods, as you add breathing mods
the engine is able to keep making power to a higher RPM (assuming your valve springs and such can keep up)

So PEAK is the highest HP number you achieved - redline may or may not be the same.

But breathing mods extend that high HP in the RPM range...

Otherwise, why would Crawford post things like (9 hp at Peak and as much as 20 at redline ???? )

The only number that matters in this sickness we have is the highest HP point i.e. Peak

It may be at Redline, or it may be some number of Revs prior to redline

The higher rev provided by say TS reflash, extends the usable power curve by keeping you from bouncing of the limiter.

Since the max power is made between 6 - 7.x RPM even if at 7.x RPm you are down say 10HP from peak, you are still better off as you hit the next gear at say 5.8k RPM, rather than 5.4K you would without the extended rev limit.

 

I forgot my bolts @ home, what size washers do the bolts use?

 

M6 washers.

As an alternative, you could 1/4" ID washers.

 

In the new groupbuy in my350z.com, seems like most of the G35 Coupe guys are going for 3/8" instead of 1/2" size spacer. Whats the reason to it? I read somewhere that seems like 3/8" spacer ran smoother than 1/2". Is that true?

 

That is not true. I just purchased the 1/2 spacer and it runs fine. In fact, I had Nissan install a set of JWT Cams and they really liked the Motordyne spacer. The salesguys and the mechanic wanted one for their 350Z's.

 

I picked the 3/8" so I could keep the stock look with the engine cover.

 

what about last groupbuy on g35driver.com? What did most people went for?

 

Etang789,

You can't even get into the groupbuy on g35driver.com unless you're a premier member. There is a group buy going on at my350z.com: http://www.my350z.com/forum/showthre...0&page=9&pp=20

The group buy should go on for another week or so. Or until they run out of parts ~100.

3/8 IN spacer $160+13.95 shipping + tax (for CA residents) (retail price $215 @ www.motordyneengineering.com)

 

Just pm or email Tony @ Motordyne. You can contact him here or on MY350Z.

 

Sorry my mistake!