RX-7 or RX-8???

James31278 · Post by **James31278** » 12 Sep 2005, 23:28

Grez~Supra_RZ-S wrote:
This is true the RX-7 kills the Supra easily
Heh, not quite. You see, the 13B-REW engine almost completely lacks torque, whereas the 2JZ-GTE has buckets of it.This means that the Supras powerband is much lower in the rev range than an RX7, and pulls through the gears stronger.

Thats on paper. In reality, youre looking at these sort of specs:

Supra - 13.6@106mph
RX7 - 13.8 @ 103mph

Which equates to about half a car length on the street/strip. Remember, BHP sells a car, torque makes it go fast.

Lets not forget the Supra is ALOT heavier than the RX-7. The RX-7 is gonna out perform it simply because its a better balanced car. A Turbo'ed or Supercharged RX-8 might kill the Supra too.

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 13 Sep 2005, 00:37

The curb weight of a Supra is 1549kg. The curb weight of an RX7 1310kg. To point out to you that the Supra isnt as heavy as you make it out to be, the weight of a Ferrari 360 is 1450kg.

Now, that ''torque'' thing I was on about. A rotary engine is almost completely torqueless, which means that to get any power out of it, the revs have to be very high. Comparable with a Honda. This means that it enters the powerband later on, and wont pull as strongly through the gears as the Supra.

Meanwhile, the sequential turbos of the Supra spool quite early on, and the buckets of torque help to keep the car keep pulling. This is why Supras are most often raced from a roll.

The 2JZ-GTE is also a much stronger engine, and will respond to modifications much better.

Now, for your turbo/sc RX8 argument.

Price of a Mazda RX8:

We'll go as cheap as we can here, and an 03 will set you back approximately Â£15,000. Thats used, obviously.

Now, for a Blitz Supercharger kit. Thatll set you back a cool Â£3'749. That does include all the trimmings required, except for an ECU upgrade to allow the rotary engine to handle boost. Bearing in mind the approximate power increase of such a kit, itll add somewhere in the region of 50~70bhp depending on boost, and with the supporting ECU.

So, going on its very best results, according to a performance calcluator, a 298bhp RX8 will run a 13.4 @ 104mph. However, lets add the weight of the driver, and it soon jumps up past the 13.6 mark, very similar to what a Supra runs when its completely stock.

So, lets take a look at the Supra.

Right now as Im typing this, you can pick up a UK spec Supra TT for around Â£5'000. Take a look on autotrader if you dont believe me.

Now, thanks to those boys at suprastore.com, I can pick up a nice turbo package for my newly acquired Supra. At this point, I have just over Â£13'000 to play with to macth what was spent on the RX8 to get it to run mid 13s.

What does that buy me? Well, for the handsome sum of $29'000, which is Â£15'000 going by the current exchange rate, thatll buy me the new 1375bhp conversion kit, which includes all the trimmings once again. This even includes stroking the 2JZ to a 3.4L.

Performance wise?

Back to our calculator. It results in a quarter mile time of 8.6 @ 174mph. You might note, thats just ever so slightly quicker than an RX8 with the same money spent on it.

In closing, you can spend Â£5k on a Supra, or treble that to get an RX8 to run the same times. I know Id be angry if I spent all that money to beat a completely standard, and older car.

Kid Cro · Post by **Kid Cro** » 13 Sep 2005, 14:06

Realy impresive proof,calculating,thinking and knowlage! Are you mehanic?

James31278 · Post by **James31278** » 13 Sep 2005, 19:58

Drewb99 · Post by **Drewb99** » 13 Sep 2005, 20:55

Grez~Supra_RZ-S wrote: Now, that ''torque'' thing I was on about. A rotary engine is almost completely torqueless, which means that to get any power out of it, the revs have to be very high.

The solution = launch higher, a Supra person should be familiar with that

20Bs aren't that expensive either, find a Luce or something and you're set to go.

James31278 · Post by **James31278** » 13 Sep 2005, 21:46

Drewb99 wrote:
Grez~Supra_RZ-S wrote: Now, that ''torque'' thing I was on about. A rotary engine is almost completely torqueless, which means that to get any power out of it, the revs have to be very high.
The solution = launch higher, a Supra person should be familiar with that 20Bs aren't that expensive either, find a Luce or something and you're set to go.

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 14 Sep 2005, 02:52

Im not a mechanic, although I do carry out all work on my cars myself.

James31278 wrote:

Intelligent response.

The solution = launch higher, a Supra person should be familiar with that 20Bs aren't that expensive either, find a Luce or something and you're set to go.

You forget, I also own a Del Sol VTi. I know the meaning of launching higher in the rpm range, and I can tell you from experience that anything over 3.5k rpm results in tremendous wheelspin. The 20B is surprisingly expensive, and its probably easier to sort out the 13B.

James31278 · Post by **James31278** » 14 Sep 2005, 03:00

Grez~Supra_RZ-S wrote:Im not a mechanic, although I do carry out all work on my cars myself.

James31278 wrote:
Intelligent response.

The solution = launch higher, a Supra person should be familiar with that 20Bs aren't that expensive either, find a Luce or something and you're set to go.
You forget, I also own a Del Sol VTi. I know the meaning of launching higher in the rpm range, and I can tell you from experience that anything over 3.5k rpm results in tremendous wheelspin. The 20B is surprisingly expensive, and its probably easier to sort out the 13B.

Everything out of your alligator mouth to me has been anything but intelligent.

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 14 Sep 2005, 03:02

Im sorry if truth is a currency that you dont accept, but meh, Ive met enough of your type in my lifetime not to care.

boganbusman · Post by **boganbusman** » 14 Sep 2005, 13:39

James31278 wrote:Everything out of your alligator mouth to me has been anything but intelligent.

I'm sorry . . . what?
Are you trying to say that Jon here is talking out his bumbum?

I'll bet money that he knows a f***load more than you.

And I could also say it's like the pot calling the kettle black

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 14 Sep 2005, 14:11

Any form of proof you require, Ill get. The Del Sol currently isnt running b/c the distributor crank seized.

Kid Cro · Post by **Kid Cro** » 14 Sep 2005, 16:02

boganbusman wrote: I'm sorry . . . what?
Are you trying to say that Jon here is talking out his bumbum?

I'll bet money that he knows a f***load more than you.

And I could also say it's like the pot calling the kettle black

Man who is JON?

Dude · Post by **Dude** » 14 Sep 2005, 16:40

I heard that the new RX-7 not the 1995 or 1999 will have better performance because of bigger rotary engine

Drewb99 · Post by **Drewb99** » 14 Sep 2005, 20:56

Supposedly it's still using the 13B-MSP like the RX8, but with a supercharger. It's still speculation if they'll even make it though, I just want a lighter RX8.

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 15 Sep 2005, 01:10

With 2 doors.

Drewb99 · Post by **Drewb99** » 15 Sep 2005, 04:52

But then it can't hug you <3

Kid Cro · Post by **Kid Cro** » 15 Sep 2005, 16:19

And he cant hug you either!

Cpt.Razkit · Post by **Cpt.Razkit** » 16 Sep 2005, 03:55

I would choose RX-7 for performance and awesome looks. I love the RX-7, but the RX-8 is awesome too!

DeSantos_MKII · Post by **DeSantos_MKII** » 18 Sep 2005, 12:17

IMO I think RX-8 is better than RX-7

Erikjef_24 · Post by **Erikjef_24** » 18 Sep 2005, 21:56

I luv them both but I prefer RX8

Kid Cro · Post by **Kid Cro** » 19 Sep 2005, 08:41

Yes ,yes,yes RX-8 wins!

SkeeteRX7 · Post by **SkeeteRX7** » 22 Sep 2005, 03:12

now im an expert, and i kno 8's are better because they made the engine more reliable, and yu gotta respect them- the last N/A rotary had 146 hp, while the 13BMSP renesis has 238-247 hp, with better reliability and parts., It is my favorite car.

James31278 · Post by **James31278** » 22 Sep 2005, 09:47

SkeeteRX7 wrote:now im an expert, and i kno 8's are better because they made the engine more reliable, and yu gotta respect them- the last N/A rotary had 146 hp, while the 13BMSP renesis has 238-247 hp, with better reliability and parts., It is my favorite car.

I know they made it more reliable, or else I would see 8's on the side of the road all the time. I love the RX-8. I like the RX-7 too but I currently like the 8 better because its modern and less problematic.

Grez~Supra_RZ-S · Post by **Grez~Supra_RZ-S** » 22 Sep 2005, 15:04

SkeeteRX7 wrote:now im an expert, and i kno 8's are better.

Better is a relative term. If you mean more reliable, slower, and more economical, then yes youre correct. But then a Civic is better than an RX8.

Kid Cro · Post by **Kid Cro** » 22 Sep 2005, 18:32

Ummmm... No! Civic cant be better than an RX8!