Looks like really good boost from 3K+ and full boost right b4 5K.....not bad



I dont have an rx-8....but ur free reving seemed slower than what i thought rotaries should be....am i just ignorant of how they are orrrrr?????

Actually at that time I had the boost controller setup to slowly move the wastegate. On a quick setting, you'll see full boost by 2800 rpm or so, but then you can easily spin your tires from a dead stop.

mysql.. just a comment.. lol.. the sound of your BOV drives me nuts every time i watch one of your videos. That thing is obnoxious!
Otherwise, your car is hawt! Lol.

the bov doesn't sound too bad normally, in the videos the camera is right up at the bumper or with the hood open.

I've been thinking about getting a tidal or type-RS, but it's not high on my list since it doesn't do anything besides change the sound. I can always set it to recirculate and completely remove any noise (pipes already setup for it)

1.) What are you doing owning an RX-8 is the majority of your driving time is spent belwo 3500 rpms?

2.) You do realize the RX-8 is a total dog below 4k rpms right now in stock form, right? Would it really make a difference if the turbo didn't spool til 4k rpms?

3.) If you're talking 250-400whp on the large majority of cars that's not a "large" turbo. There are road race and time attack guys that use GT35-37R turbos, and they need good powerbands, not big power. Yet even with that turbo some cars can make over 700whp.

Not on a 13B.

And sizing smaller to get boost below 4K would be ideal so the car isn't as much of a "dog".

Wow. Someone woke up on the wrong side of the bed. Mad props for deteriorating this thread.

1. Yes, most of my time is spent around 3500rpm as it's my daily driver now -- I totaled my motorcycle in a really bad crash recently. I've slowed down a lot ever since gas started +$3/gal! However, that doesn't mean that I don't drive this puppy balls to the wall. :)

2. I brought this up, so I don't see how your question is relevant.

3. We're not talking about 'the large majority of cars'; we're talking about Rx8. This thread is about twin-turbos. Therefore, we're not talking about pure racing applications, but moreso street applications.

-jc

I shift by 3000 rpm's daily driving a Civic! It's easier to drive like that in an RX-8 so i don't see what the issue is.

I think the more important point is, if you are driving at 3500 rpms, what do you need boost for? At 3500 rpms, if you want to accelerate quick you are going to down shift if not one then 2 gears. At the lower gear, your RPMS would be way over 3500. If you look at the dyno comparison thread, you'll see the different power bands people are getting with different kits. A twin tc is not going to alter the fundamentals of the engine so you are going to get similar characterstics as the other kits but possibly a different combination than they do.


The general mechanics of air + fuel -> power apply to all engines which why someone can claim a turbo to be a "400 hp" turbo without knowing what engine it might go on. It'll flow a high enough mass of air to produce 400 hp at a generic bsfc to get to 400 hp. The point is is that the goals and properties of what used to be a twin turbo system can now be accomplished with a single turbo system in many cases. The additional cost and complexity of a twin turbo then becomes moot unless your application specifically demands it.

And yes, sometimes Ike is a touch unfriendly. Watch your fingers. He does bite.

HERE IN PUERTO RICO SOME RACE CARS ON 13B REACH 1100 RWHP AND 7.20 @180 MPH IN 1/4 mile:fingersx:

They probably also get 4 gallons to the mile and will never go more than about 10 miles in their entire life (if they are lucky!) before they need to be rebuilt or replaced.

I meant on a GT35 for the 700whp mark, which is why I put it in bold when I quoted Ike.

I don't tend to bite unless I'm provoked, but then again, I do have my days. :)