MazdaManiac

iTrader: (3)

Cavitation does not reduce drag, just efficiency. It still isn't all that much until very high RPMs.

The generator continues to ramp up lineraly and the drag grows exponentially. The current output is electronically regulated and has nothing to do with the field strength. The generator is pullied for high RPM already (hence the heavy loading at idle).

High load, not RPM.

Dude, whatever. I've got nothing to sell and there is nothing of which you need to convince me.
I've already gone down this road, did the tests, the drag races, the experiments.
I had pullies on all of my cars until this one.
It just doesn't amount to anything on the RX-8 because we don't have hydraulic power steering.

Brettus

iTrader: (2)

the only reason I feel the need to convince you is because you rubbish everyone that suggests this mod works .........

RX8PDX

Probably because of the reasons mentioned above.....

Been there, dont that..... but I dont believe him until I see his T-shirt

MazdaManiac

iTrader: (3)

I'm not "rubbish"-ing anyone and I'm sorry you feel that way.
Trashing someone's ideas is not the same thing as trashing them.
You need to divorce yourself from the things you believe in.
I am not attached to any ideas.
I simply follow the evidence and the logic. Wherever that takes me is perfectly good in my eyes.

The problem with stuff like this is that we become attached to things we have been sold on - because we want to believe and because we have spent our own cash.

swoope

iTrader: (5)

nice,

the secret that works for me. with stockish tires.... 4.5 to 5k launch and the feathing of the clutch...

that trap speed is very good... what was the temp?

beers

Brettus

iTrader: (2)

[QUOTE=MazdaManiac]I'm not "rubbish"-ing anyone and I'm sorry you feel that way.
[QUOTE]

Not really a problem - I just want to get to the truth .

Brettus

iTrader: (2)

Tires are stock Bridgestones at 32 psi
Ambient was 16deg C (61F)
I'm feathering the clutch at more like 7k - feels like a good launch to me but if experienced drivers are getting the same time as me stock then I'm doing something wrong.

Edit : Oh **** - I just realised that I didn't turn off the DSC (bangs hand against head)
will that make much of a difference ?

rotarygod

I've had an underdrive pulley for my RX-7's for years now. My current RX-7 does not have one installed even though I do own one that is just sitting there. It used to be on my old 2nd gen RX-7. There is no noticable power change with one which is why I haven't installed it. Next time I build an engine, I'll probably do it then but I'm not going through the time and effort to install it now.

Silver_Surfer

****, if pulleys make a differences can you imagine the gains on tire size? Lets say going from 225/45-18 to 225/40-18? A 1" difference plus weight X 4.

Raptor75

The DSC will most likely make a big difference in you times. When it is on it will shut down the power when the rear wheels start to spin. Make sure you completely disable it before you make your runs (hold it in for 8 secs until both dash lights are on constantly.)

swoope

iTrader: (5)

did you turn off the traction control... you must have... the dsc would play little in a straight line..

also start dropping you rear tire pressure... i would start at about 28lbs and go down and see what works best for you..

beers

8at18

Mazda maniac said he likes white belgian stuff. I don't know this thread seems to be getting a little out of hand.

RX8PDX

I dont have the slips, but I have taken my car to PIR a few times.

And for the first few runs I kept forgetting to turn off the DSC.

It made a huge difference. I was launching from around 6K, and you feel just as I was letting the clutch out, the car would just booooog down.

I could be just me and my noobness, but turning it off made a drastic difference.

Silver_Surfer

I guess this thread is split like the syn oil issue.

Moostafa29

I wouldn't really call it split. Its just one person disagreeing with thirty others.

Brettus

iTrader: (2)

Had a real interesting day at the dyno today - learn't heaps .
One thing I learn't is that I will have to shout MM a beer .
In all the pulls we did I saw nothing to suggest that there was any measurable mid range gains from the pulley . In saying that I am sure that even if there was a couple of horsepower there it would be very hard to detect because no two dyno runs were identical.
I did see some small gains at higher rpm but it is too hard to tell if they are from the pulley , the flywheel or the cold air duct .
I was very sure I felt an increase at lower RPM and would just about have bet my left one that it would show on the dyno but like my man at KiwiRE says - "the dyno doesn't lie"
Perhaps what I felt was more related to the flywheel as I only really felt anything in 1st , 2nd & to a lesser extent 3rd where the flywheel has most effect.

Black line is after the tune (3rd gear pull)
Blue line is after mods but ems maps set to zero
Green line is stock

Now for the good news - we found significant gains at high rpm from tuning - will explain more about that in the powermod thread I started.

MazdaManiac

iTrader: (3)

Tuning trumps all.

Brettus

iTrader: (2)

0-60 @ 15deg C ambient

Read em & weep

ca18detsilvia

just another thing to add. I couldn't justify buying an expensive intake. i bought the racing beat ram air duct and cut a piece off the stock duct so the RB unit is sealed to the factory air box. I then bought a 3.5 inlet Cone filter that has a reverse cone at the tip of the filter. I poped off the air horn inside the air box along with one of the screens. Then I installed the filter and it had just enough room to close the box. The reverse cone on the end of the filter is in the direct flow from the racing beat air duct. As you can see in my sig i have a few mods already, but this cone filter mod made it sound alittle deeper and it could just be the butt dyno but it did feel like there was alittle more up in the top end. for such an inexpensive mod i highly suggest it. I would think that the stock air box with a cone filter and the RB air duct would be as good as any expensive intake. try it out and see how you like it, i did

Lasse wankel

So you here also Brettus posting "wink" Just 0.01s seems like an easy task for me but i could be wrong. We will see what happens today!

/Lasse

Brettus

iTrader: (2)

Very cool idea - deserves a DIY !

Razz1

That dyno looks like there is about a 2hp gain from 6 grand on.

Brettus

iTrader: (2)

Just a bit of an update on this . Have spent some time at the track recently and have some good comparisons now with other cars that are normally quicker than an 8.

Stock S2000 - absolutely neck and neck fom about 40 mph - 130 mph
Stock 2006 STI Sabaru - lose about two car lengths from 40 mph - 95 mph
Honda accord Type R - neck & neck 40-100 mph

eviltwinkie

But I like my AP pulley! Its blue! And really makes me feel pimptastic! I'm all like...look vtech boy...I gots a blue pulley...dont make me open a can of pure pwnage on you...

I really like the blue pulley...its blingtastic and add +5HP to my butt dyno..

Brettus

iTrader: (2)

Since starting this thread I've done a couple more things :
Mazsport coils
Trust TI exhaust and custom dual resonated midpipe

A couple of days ago I had the oportunity to run with a practically stock RX8 (K&N version 2 only mod)
2nd gear roll from about 3000rpm right through to 9k in 3rd .

Through 2nd gear there was not a lot in it - perhaps one car length . But in third gear the difference was substantial - maybe 4-5 car lengths . As the speed got up the difference became more marked .