cjkim

that's got to be the funniest post ever

invasion08

iTrader: (7)

how so, rich rx8 is saying he wants the torque he gets at 5000rpms that he does at 2000rpms. i do not know what is funny about that

helldorado

Hey guys, I'm not sure if this is my first post or not, normally I just lurk and lookup info about the car since I bought it for my GF and rarely get to drive it. I was browsing this thread since I have the 4AT for her and she's always telling me she wishes it was as fast as my G35.


Anyway, I wanted to try and clear up some of the confusion I'm reading here. Gearing aside, meaning all things being equal, torque is what you want to increase on the engine. I know you're all saying HP because its a rotary, but HP is a made up number. Seriously, HP is nothing more than an arbitrary rating about a horse pulling 330 lbs of coal 100 feet in a minute. That number is derived off ft-lbs of torque. This is why torque matters and not HP. HP = torque * rpm / 5252

I haven't had a chance to dyno the car yet, but from what I saw in the dyno sticky, the torque curve is extremely flat compared to most other engines. So your "big HP gains" are only if your torque increases are strictly in the high end. If your torque gains are in the low end of the power band, it'll appear like you haven't gained any HP.

With a Lysholm twin screw charger, they develop full boost pretty much off idle and keep that boost level consistent up to redline. I'm not talking about roots, they get too hot to keep boost levels up at higher rpm's. But if you can pump an even 6 psi from 2000-7500 rpm, you'll see an even increase in torque, which will translate to much better HP gains on the high end as well.

So in the end, you want torque, both low and high because it means more HP overall. An extra 40-50 ft-lbs of torque throughout the entire power curve would do nicely. If you're going to take a baseline of 100 ft-lbs at 7000 rpm, which would be 133 whp, at 150 ft-lbs at 7000 rpm, you're up to 200 whp. That's what you want and its good for any kind of gearing, wide or narrow.

I'm going to keep an eye on this thread. With a little luck, something will be available for the 4 porters by the time I'm done modding the suspension and exterior on this bad boy for her.

My only consideration is... will the stock tranny be ok with the extra power? Or will it need to be rebuilt by somebody like Lentech?

snizzle

I have this same concern. Hymee, any idea what the stock tranny is rated at? I understand it was the same one used in the FD. A new tranny would significantly increase the cost of a project like this.

Rich Rx-8

Why is it funny ?? I want more torque, and I want it in low RPM's, what don't you understand punk ??

Rich Rx-8

I thought the FD tranny was pretty strong. Wouldn't it be strong enough, if not I agree it will definetly be more $$$. More $$$ sucks.

yiksing

I second that, I think he would enjoy a diesel truck.... hahhaaaaa

therm8

How many diesel trucks do you know of that only put 125-130lb-ft of torque to the ground at 2000rpm...

In all reality the twin-screw supercharger will allow for more than that out of the 4 port at low rpm.

So, again, what's so funny?

Rich Rx-8

Again, why is this funny ??

Rich Rx-8

This is what I said, why is it funny/funniest post ever, I guess I don't get the joke, I want more low end torque ??

invasion08

iTrader: (7)

So Hymee any updates?????

DOMINION

Yeah let us AT's know what the good word is

DOMINION

Dam. Big bump!~

snizzle

Sorry if I missed this but.... what engine management is Hymee using for this project?

Hymee

iTrader: (1)

For the development and initial prototypes we are using MoTeC as it is a proven reliable system that gives us complete control of fuelling and ignition. It is race proven and survives the heat of battle, has incredible logging and analysis capabilities, and gives infintely finer grain control than other systems.

However, we are not wedded to one management solution, and further down the track there is definate possibility of using other "cheaper" systems, including our own research into reflashing.

Cheers,
Hymee.

invasion08

iTrader: (7)

Will we see the supercharger for the 8 by the end of the yr?

DOMINION

I hope so

cjkim

eh, the only thing correct about that would be the equation
you can apply force and do no work

okay, so in the end... you can just say you want HP -_-

you wanting more low end torque wasn't funny. wanting torque you currently get at 5000 in the lower range is funny. that would yield and increase of ohhh, what, maybe 15 ft/lb?
i just would expect someone who seems to be so torque hungry to want a bit more torque than a stock 8's peak. you make it seem like the 8 turns into a torque monster at 5000 rpm. in reality, this car's power delivery is very linear.
ride blindfolded with ear plugs and let's see how different it really *feels*. you might feel it, but it won't be much


SORRY FOR THE HIJACK!! let's see some automatic work now. I've got a manual, but I'd still like to see some automatic aftermarket support.

Rich Rx-8

My car really does jump foward at 5k rpm's, it definetly doesn't feel linear at all in regards to the power delivery. There's literally nothing off the line then it takes off. I have an '05 AT.

MazdaRX8er

is the supercharger on sale yet??

DOMINION

You know. My car was strong after the brake in period. Now that my Engine has been re-built its even slower off the line. But I have hope after my brake in period it will come back to life

Sadly its not.

RichardK

I'm looking forward to this being finished; the UK market 190s could do with a boost. Plus, unless things are changed, I think the simpler plumbing for the 4 port engine and lower rev limit might actually make this a really pleasant GT to drive day to day.

DOMINION

I hope so. Man I cant wait.

SlayerRX8

It's so frustrating waiting for this thing. I want it so much more than any other FI....and I'd get something else for my AT 8, but wait - there aren't any other options.

grrr

Wish there were something we could all do to help Hymee out and speed this stuff up.

Hymee

iTrader: (1)

I'm open to creative suggestions!

Cheers,
Hymee.