10000RPM

That is very true, but to make up for my lust for low end torqure I also drive a (Dakota 5.9L R/T regular cab) thats all that baby has is Torque :D a quick snap of the throttel and you got two smoken tire strips 20ft. long :p I hate to say it but my R/T kills my 8 in the strait line department but if the road curves then it's the 8 all the way.

SPD-FC

if he was running 275 nittos 555r (drag radials) he might have, all tracks are different so it is hard to compare

strangelove

because superchargers are belt-driven, they actually bog an engine down at first. most have a minimum required hp/torque number for the engine to even be able to turn them, but once it gets going, the FI kicks in and the supercharger works its magic. on a car with low torque numbers, high-boost superchargers aren't as effective as good turbos are.

RX8-TX

Isn't a SC much more efficient at low rpms, given equal boost levels with a TC on a low TQ engine?

I know SCs have parasitic losses (PL) but, TCs have to wait for exhaust gases to spin up the turbine. Therefore, unless you are already at a high rpm level, the SCs parasitic loss would have to exceed TC lag in order to be a disadvantage.

Damn, now I am confused again: I understand that high boost applications will be a big disadvantage for both (TC & SC) because of the 13B's nature but, at low boost (5~8 PSI) which FI method becomes more effective?

IZoomZoomI

this thread might clear some things up regarding centrifugal sc versus positive displacement sc's...https://www.rx8club.com/showthread.p...t=supercharger

strangelove

turbo "lag" only implies that the turbo is taking along time to spool up. the turbo itself isn't hampering the engine. with a supercharger, the engine has added stress until it reaches a high enough rpm to spool the sc up to the point it's actually adding boost.

RX8-TX

Thanks for the link. I found RG's writeup on the first page. :D


Alright, I just read that Positive Displacement SCs offer full boost from idle to redline. Isn't that a benefit against a centrifugal (TC) FI method?

-8-

Yeah OK, maybe using your GTech Pro....

14s4doorNA

hold the traction control button for 7 seconds....... watch your tachometer

WTF no turbo

**** like this is why i wasnt going to post time.I wouldnt even begin to believe gtech times.This run was done at MIR Maryland International Raceway.I have the slip somewhere,but im in the process of moving so im not in a great hurry to prove anything to anybody.This run cost me a tranny which i also have the receipt for if you dont believe that either.Mods were b&b exhaust, midpipe, green filter and 275 nt555r with about half thier life left.I run nt555s 275 as my street tires.I have since ripped everything off the car and it is now my daily driver.Back to another fd and the 7 forums.Less ******** there.

Xyntax

OT: WTF no turbo, did you have the stock rims to go together with the 275s? Do they bubble out or look fat like some people say? I've seen a 275 on a yellow rx-8 but it had new rims on with it.

Tony Orlando

I was going to unload, but then I saw the post count....

A positive displacement SC application requires the throttle body to be relocated pre-blower. Therefore, you have maximum boost the instant you open the throttle. Superchargers do not "spool-up", and unless a Centrifugal is being used, are not RPM dependant.

This is one advantage of a SC over a turbo, and the reason why many engines with low torque numbers (Miatas, for one) benefit so much from them. The high end is already there, you simply fill in the bottom.

WTF no turbo

275 was on a g-games wolf 19x9

WTF no turbo

Ike

Ito didn't produce a slip either... Lets see if you can and prove me wrong and produce a slip, til then I think you're full of crap. Maybe even some proof that you actually had these mods on your car. The thing I just don't get is why when you made this run you didn't post about it, and why you wouldn't have a slip for what would be the fastest run for an RX-8.

WTF no turbo

Ok assneck im done with you.I have posted pics of all mods done.Call rosenthal and give them my address 11 hidden cove ct 21220 and ask if they sent a flywheel.Have any more problems you can use that address for another reason.Come see me.Said i was moving and i believe i chucked it.Didnt think i would have to prove myself to a snot brat kid.

IZoomZoomI

i'm with ike on this one, if I ran a 14.02 the first thing I do to the slip is frame it

Ike

Blah blah blah, and where's the link to your post with all the pics of your mods? Besides, at best you maybe are getting 10whp out of those mods even if you did have them, that with the drag radials is not going to give you a 14 flat.

WTF no turbo

After you drive a 9second car wtf would i keep 14.02 for.Honestly i didnt think it was a big deal when i did it.Now that this is a daily driver and most mods removed she will never see the track again.Personally Ike i really dont care if you believe me or not.

Omicron

That's enough, folks.

red_rx8_red_int

Yep, might as well close Omi.