turborx8

iTrader: (1)

If you don't mind sharing, what did this engine cost?

Flashwing

I'm starting to think it cost Kane his sanity!

olddragger

iTrader: (3)

ltft in the 3's aint that bad right now?
what duty cycle are the injectors/
is your maf scaled?
trying to learn a little about tuning?
dad is having fun?
OD

Kane

iTrader: (1)

No LTFT is 0 (well close enough); STFT bounces a few % points... the OPEN loop area is where I get into my 3% deviation which I'll work to get out tomorrow.

I haven't been warrying about injector duty cycles as I am still only tuning my cruise areas. Once the injectors are right then yes - all this stuff is scaled off the MAF.

I'm documenting this all for a tuning thread in detail.

Kane

iTrader: (1)

I need to sit down and add it all up again; but it was every bit of 5000, and prolly close to 7 by the time I add it all up.

MazdaManiac

iTrader: (3)

Actually, for reasons that are beyond the scope of this thread, an RX-8 with a turbo (and properly tuned) gets better gas mileage than an N/A RX-8.
I seldom get 28 MPG, but I regularly get 25 or 26 on the highway if I stay out of it.
Around town (even getting in it a lot), I see 18 to 20.

Phil's 8

iTrader: (3)

When is the last time you "stayed out of it"? I can equal you on the highway but can't learn how to stay out if it in town.

MazdaManiac

iTrader: (3)

Well, first of all, I said turbo! lol

Because of your particular combination of devices, the demands on the motor at low loads is somewhat higher than it is on my car and the required part-throttle torque for similar acceleration at low-load is higher.

As an additional datapoint, I get mileage as low as 8 MPG on the track, where I spend 80% of the time above 6k RPM and 30% or more of the time at WOT.

MazdaManiac

iTrader: (3)

Purring.
It doesn't like to start in the cold as much (3 or 5 turns as opposed to 1 or 2), but the throttle response is still the best I've had in any motor and the idle vacuum is still climbing instead of dropping, despite my tendency to leave it on the rev limiter in second on my way out of the Safeway parking lot from time to time.

blackenedwings

Hehe, nice... how do you get traction in second? I don't know if its due to the colder temp here and my summer tires, but I break the rear free so easily in second.

MazdaManiac

iTrader: (3)

Wider tires (I'm on my spare set of 245s at the moment until I can get a set of 275s), proper amount of camber in the rear and throttle modulation.
I was heading up the hill from my house the other day and I was at 3000 in 3rd.
I stood on it to pass a minivan and ended up just spinning.

Ahh. That's what you meant by "goad". lol

olddragger

iTrader: (3)

in reference to traction---what spring rates yall running?
OD

maxxdamigz

iTrader: (1)

I run stock springs with about 100 extra pounds on the rear axle, 275 NT-01s. Cold tires, I can pop them loose in third but they don't like the cold much at all. Warmed up, no traction issues on good dry pavement. I do find that the stock suspension (at least mine) has a tendency to wheel hop when they are cold.

I'm very much looking forward to Kane's engine tuning/break-in documentation. That stuff is usually a good read and I sure do like numbers.

MazdaManiac

iTrader: (3)

400 up front, 275/325 progressive in the rear on stiff shocks.

Brettus

iTrader: (2)

/\ get any axle tramp ? That has been a big issue for me - I only have mazdaspeed springs and shocks so not really that stiff ...

shaunv74

Those rates sound like you skipped the RB springs and Bilsteins and went to a set of coilovers. (Except the progressive rear rate)

I don't want to drag Kane's thread off topic. Do you have a thread on your current suspension setup?

MazdaManiac

iTrader: (3)

I have MS coilovers in the front and a customized spring setup in the rear.

Only from a standing start.

SlideWayz

Any fearless predictions on when you'll strap this onto the dyno?

Kane

iTrader: (1)

Based on how fast this spools.... I think I'll set a new torque standard down low - and if I can keep it to red-line it should be something to behold.

05rex8

iTrader: (7)

What's this franken-motor you speak of? I'm kinda out of the loop a bit...

Jedi54

iTrader: (7)

the infamous Franken-Motor was built from parts out of an RX-7 and and RX-8 that Jeff had lying around in the garage.
That motor has been running for a while and is a champ!
Ray: how long did it take you guys to slap that beast together?
Jeff: how many miles on it now?




Actually, that's not ENTIRELY true. Well... all of it IS true minus the RX-7 part

czar

iTrader: (3)

pretty crazy, wish i had the money to build it similar to this, very interested on getting the seals clearance like you did.

get a video while your on the dyno for those of us not privileged to watch the beast on the dyno

Kane

iTrader: (1)

https://www.rx8club.com/series-i-engine-tuning-forum-63/how-kane-tunes-fi-renesis-turbo-ported-ceramic-seals-188514/
https://www.rx8club.com/rx-8-multimedia-photo-gallery-6/now-kanes-2010-photoshoot-my-rx8-188704/

TeamRX8

iTrader: (25)

Then you'll need to dump those low offset wheels with small tires and put some real meat under it

Kane

iTrader: (1)

Yeah I am already running into that problem just putting around. One time I had to goose it to clear oncoming traffic and it was an interesting experience. Once these get worn out It'll be 275 and 245.