shadycrew31

iTrader: (6)

If you are trying to compete against super-cars your 8 should have an REW...

Brettus

iTrader: (2)

If I had the same up top as now and could get back what I lost down low - I really think the car would be as good a street weapon as it can possibly be with this engine.

To do that with the Greddy pipework ................... GTX3071

9krpmrx8

iTrader: (46)

That's why an engine swap is the only viable solution.

golde4u

At that power level what is it competitive with?

golde4u

In the D.C metro area I see gtr's, mc clarens, ferraris, lambo's, vette's and gt3's and not to mention the mustangs daily. Though the higher end cars don't engage you normally, aston martin's , porsche's, vette's and mustangs get at you at the drop. The only advantage is they never go hard in the turns. 400whp would be nice, but NO kit maker as of yet has done it.

shadycrew31

iTrader: (6)

Evo's, WRx's, Turbo miatas... Pretty much your average track vehicle.

Also its not so much how much power it makes, its more about where the vehicle makes its power...

But I dont track, so I don't know anything at all. I'm just another dumbass on the RX8club.

skc

The RX8 is very competitive on a tight undulating tracks. On tracks with lots of straights we tend to struggle.

I had a bit of fun with an aston martin last week. I saw him following me for half a km and he was driving aggressively so I knew he was going to floor it at the next set of lights. I had my wife with me in the car and I asked if it was ok to take him on and she approved. So I floored it and left him behind as I headed towards the freeway. I looked over and noticed him gaining on me as I had slowed down soon after reaching the speed limit. Luckily, he was not getting onto the freeway as I did not want to get tempted to exceed the speed limit.

The acceleration in third gear is brutal and you can go from 80 to 120+km/hr within a few seconds.

golde4u

an engine swap with what engine, what's the best option? A mazda3 may be an idea. small size, already capable of good power, reliability and fuel economy. But has anyone done it yet? the ecu should know all the other systems in the car. just a thought, I'm not a mechanic.


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blackenedwings

Power to weight is a huge factor, aero, and overall grip as well. For a street car I feel that an RX-8 with around 300 whp is just about right. My Shinka was 330 whp Dynojet at 12 psi. It's quick enough to have fun without being easy to get into trouble. My current car on street tune is 504 whp and there just aren't many places on public roads you can hit full boost.

On a track though, with equal modified P/W (TT2) I struggle to fight built Corvettes because they have so much better high speed aero (I drive a brick with wheels) and insane torque. They might be running the same or less power than me, but they have 60-80 wtq more. I have to make all of my time back in corner exit by getting on throttle super early. The difficulty for an RX-8 is that it doesn't have the torque of a Corvette, but the same drive wheels, same weight, and similar or worse aero.

In the end though if this isn't built as a race car, for the street 300ish at the wheels and -reliability- is all that matters.

Brettus

iTrader: (2)

Did you have a dyno chart for that with boost shown ? Would like to compare it with mine .

blackenedwings

Hmm, I may have it in my photo gallery on here. My old hard drive fried, so I don't have it there. It's been 4-5 years now though. I broke 300 whp on PFS's Dynojet at 8.5 psi with major tuning problems on the first pass of the 3071R. I ended up having to redo a lot of work on the kit before I could hold 12 psi steady, but I ran that for a bunch of street miles before the manifold cracked, the meth kit shorted out, and the oil return line broke. The only thing I remember about my dyno is the torque was low, like 222-230 wtq. It felt really fast at the time, but I just about pooped myself when I went WOT with my bolt-on Evo the first time. lol

Edit: Here is my first 8.5 psi dyno... dunno why I don't have a 12 psi one.

shadycrew31

iTrader: (6)

Can't really compare it... Boost is meaningless when comparing to completely different turbos.

TeamRX8

iTrader: (25)

The same is true for different dynos

Brettus

iTrader: (2)

You can compare anything with anything - it's all in how you interpret it .

Brettus

iTrader: (2)

We have a saying here in NZ that comes to mind ................. 'Yeah right' !

blackenedwings

Pretty much. One of the main reasons I don't drive the Evo on the road anymore. It's far too easy to get into trouble. Is NZ really bad with traffic enforcement? Where I live is full of cops and speed cameras, which is one of the main reasons I got into tracking.

Brettus

iTrader: (2)

Seems I'm not done yet - just did an experiment/modification that seems to have gained me 30ish whp.
Red line is with the mod.



Maf is maxed out at 4.97v and 410 g/s (up from 380)

Time from 6000rpm to 8000 in 2nd is down by 0.5s

350whp ( true) might be a possibility after all

Anyone want to guess what I did ?

Slidin8

Don't be a tease Brett

TELL US!!!!!!!!

skc

New exhaust maybe

Brettus

iTrader: (2)

Bingo !!!!!

What I actually did was remove the rear part of the exhaust just leaving the stock midpipe in place (with gutted cat ).

Wanted to see what could be gained by going to a 3" system .

skc

Must have been very noisy

Brettus

iTrader: (2)

Yeah - you aint kidding .

wcs

iTrader: (2)

That's awesome Brett!!!!

(looks around for a Brettspeed exhaust pic)

blackenedwings

Hah, I was thinking exhaust when I saw the dip/spike in airflow. Sounds like it was really restrictive before. What does the butt dyno say?

Brettus

iTrader: (2)

Butt dyno says 29.32whp .

Seriously though - soooooooooooooooo much vibration and noise I didn't really get a sense of how fast it was. The rear pipe is only 2.25" so might do a test with it still on but disconnected to muffler to see if restriction is that pipe or the muffler.