vosko

ran 14.5 with 2.1 60 FT. next run got a 1.9x 60 ft and messed up 3-4 shift so he ran 14.6! he believes the car can do 14.3!

Judge Ito

here is the runs.

R/T .358
60. 2.17
330. 6.07
1/8. 9.35
MPH 75.64
1000. 12.17
1/4. 14.57
MPH. 94.07


R/T. .455
60.1.98
330. 5.98
1/8. 9.29
MPH. 76.03
1000. 12..09
1/4. 14.66
MPH. 93.33
In this last run I missed the fourth gear shift really bad. to the point where the engine hit the rev limiter 2 times and still pulled a 14.6 I feel this run would have landed a 14.3 run. to be continue. My Rx8 is still bone stock.

Genom

watch out! I am sure someone will come by and let us know how it's impossible and that the track needs to calibrate or something :D

Anyway, have fun!

Ike

Nice runs! Lets see some slips, and is the car still stock?

RussellP

yes he said the car is still "bone-stock". HOW DO YOU LIKE THAT, IKE?

Judge Ito

bone stock. the only modification was my 4 year old daughters barbie doll in the rear seat.

Ike

Good job, was this on race gas, and how they hell did you manage a 1.9 60ft., that's a great launch. You were on street tires correct (guessing bone-stock would include that), and what RPMs were you dropping the clutch at?

MazdaManiac

iTrader: (3)

Better work on those reaction times. You are coming out of the box too soon. :p
Great times!
I had to drop a little bit of change into both of my cars to get them into that range from stock (MX-3 and Miata). A little more change knocked another second and a half off of that. Maybe I can expect the same from the Renesis.
I am inspired. Maybe I'll go pick up an RX-8 this week.

downshift

That's why! I heard those things add +40 hp to the car! :p

Congrats on the run. If you could post a scan of the slip, it will shut those trolls' mouth once an for all. Nice run, and congrats again.

Judge Ito

you noticed I red lighted every run. Most of the times I have a reaction in the .530 to .540's

Judge Ito

I'll give Vosko the time slips and he could post them for me. right now I don't have a scanner.

Judge Ito

100 octane unleaded race fuel. 1.9 60 FT. took a little bit of practice. yes on the factory street tires and launched @8,000 rpms...the rest is up to the power shifting. Ill be test and tunning soon again. Maybe a 14.2 next time out.

downshift

Well, this is a bit of a disappointment. I thought the 14.5 was from normal gas. Since you're pretty good at this, can you run it on 91 or 93 octane and let us know how far off the performance is compared to 100 octane?

Haris

This shouldn't be anything that great. I was happy and all, and then read it was on race gas. Well, I guess I'll have to wait for happiness when somebody runs 14.5 sec. on 91 octane.

MazdaManiac

iTrader: (3)

Hate to burst anyone's "hater" bubble, but higher octane doesn't contain any more power than running the specified rated fuel.
If there is a problem with preignition or such, the higher octane will raise the knock threshold at the expense of a later flame front - this will protect the motor at a cost of LOWER power.
Unless the track conditions were conducive to preignition (high altitude, high temperatures, blended fuel, etc...), his times can only get better with lower octane.

RussellP

why did he have to put higher octane. Gonna have to wait longer for proof to shut the trolls up.

Judge Ito

because this Rx8 runs alot of ignition timing advance(I checked it with my timing light) over 30 degrees of timing for the leading spark plugs, in top of that the engine has a huge intake port, to that you add higher compression rotors. All this combination off large intake ports, higher compression rotors and alot of timimg advance creates a MENU for detonation. that is why I use the higher octane to prevent detonation. Ill be test and tunning again and Ill make a run with the regular 93 octane first.

Blue 350z

A 14.57 (14.6) with 100 octane and powershifting is pretty good, and if he really did powershift (not letting off the gas when shifting) thats a very advanced and damaging shift technique that will usually net you .1-.2 lower ET's vs normal shifting. I still find it odd the MPHs are still so low, even with 100 octane and powershifting. But overall i'm sure the 100 octane and powershifting combo was good for a .3-.4 better ET, expecially since people have already posted dynos showing that higher octane gas on the Renesis yields quite a bit more HP.

I wish I could learn to powershift, but I am not sure i'd want to make a habit of it unless I want to make a habit of getting my tranny and clutch replaced.

But good runs!

BTW RussellP, 1 guy running a good time in an rx8 really doesn't mean much. There will always be a handful of cars that are concidered factory freak. I wish I got one of the 350z's running 13.6@103 right out the factory doors bone stock!

Judge Ito

my power shifts are super flawless. almost sounds like the car has a air shifted gear box. first miss shift I had into fourth gear. I guess I was a bit anxious to run faster then the 14.5 previous run. but in the world of drag racing the clock is your enemy and shifting is the name of the game.

Blue 350z

How much practice did it take you to learn powershifting? Have you done it on past cars? I would love to learn but I am too scared to try it on my Z because of the damange I might and probably will do.

I seen video of it and it looks like a blast to do!

Judge Ito

I've been drag racing for over 15 years. I started to power shift with my first gen Rx7 I owned back in 1988. If your going to learn, try to find a car that is old and has little value and start to learn the fundamentals there. Your going to have to be aggressive with your hand that is shifting. grab the shirter firm and hard. There is no playing around when your power shifting(especially with a car that has some serious power. over 400rwhp) When you launch get ready to power shift into second gear, At this point mash that clutch pedal really fast with out letting that gas pedal come up and shift firm and fast then release that clutch pedal. repeat the procedure into the rest of the gears. The trick is to shift smooth and fast with out releasing the gas pedal. once you get the hang of it you will never regular shift again.

CraziFuzzy

The RENESIS advances the timing as much as it CAN without detonation. This is why the car will still run fine on lower octane gas, just with reduced performance (I.E. doesn't advance as far). I would imagine if it was running with a certain advance with 91, it could probably run higher with 100. (though I'm sure there is a timing limit) Someone would have to check the timing with varying gas grades to determine just how high taking the octane will get you... I mean, if it's already as advanced as it will go on 93, why spend the HUGE extra cash for the racing gas.. y'know? Anyways, I'd love to try it out, but i lack a source of racing gas up here...

CraziFuzzy

I learned to power shift on me 87 Chevy Corsica... yeah baby that beast was quick!

Blue 350z

Thanks for the info, I am running thru the logistics of it in my head, there is VERY little room for error and I would imagine the smallist miss-que will result in a bad grind and a ruined run. Maybe i'll take my bro's mid 90's accord and give it a try :D

MazdaManiac

iTrader: (3)

Wrong.

The Renesis will advance timing as far as its timing tables say it should. It has no way to predict detonation because it has no idea how detonation resistant your gas is going to be.
After your engine experiences preignition, the knock sensor will indicate this to the ECU that will tthen pull a significant amount of timing. The ECU will then use an indexed value for timing from then on.
The ECU doesn't really care what ocatane gas you use because it has no way of knowing this and, therefore, timing retard is reactive not proactive.

To review, let me CLEARLY point out these facts:

1) Lower octane gasoline will produce more power than higher octane gasoline. Octane IS NOT POWER.

2) The ECU does NOT prevent detonation, it attempts to eliminate detonation AFTER it is detected and will then attempt to avoid the conditions (with some limitations) that led to detonation.

BTW - Ignition advance is based on load, not just RPM; you can't check total ignition advance while sitting on the driveway.
You can check you static timing on the driveway with an ignition light and that is all.
It is likely that the Renesis uses even more advance than 30° - it may be as high as 42°. It all depends on load and sensor variables.