Ok first it was around 280 hp, then it went down to 250, and now Car & Driver has it listed at 247 hp. Originally it seamed feasible that it would be able to keep up with the 3rd gen rx-7, but now they are posting 1/4 mile times in the high 14's. This poor thing will lose to mustangs! The 350z is up there at 280 hp. What is Mazda thinking?

economy? :squint:

Na, I think it has more to do with emissions and ****.

Maybe leetheslacker has a point. The 350Z doesnt gain much hp when a new exaust is put on.. think of replacing the entire exaust on a RX-8 and the gains it will have https://www.nopistons.com/forums/pub...IR#>/boink.gif



Mazda should tweak up the hp alittle more.. its gotta be able to sell! So it needs to beat rustangs..



Josh

Without a turbo version a exaust wont do much.



MazdaTrix even says on a N/A RX-7 a cat back exaust is only good for like 5hp.



Most tuning magazines will even say a exaust doesnt do much for performance on a N/A car, its more for looks and sound.



Mazda took away the strong periphial ports on the renesis so Im not sure how a aftermarket turbo would work either.

The price goes up, the hp goes down. How's that work?

******* typical is what it is, lol

At this rate it will be 60K and have a tow bar on the front for big hills.

I read 247hp also, but I think they actually dynoed. If Mazda is saying 280, and road and track is saying 247, 33hp loss through the drive rain, is that possible??



I still think the Rx-8 is going to cream any other car in the price range once it hits the twisties. Straight line speed means little or nothing to me. Plus I think the gearing and were the rotary is making the power it will still kill a 350z.



About the exhaust, the number one place to make power on a n/a rotary is in the intake and exhaust. I would like to see the gains from a full exhaust on the new renesis.

What stats do you have to prove this statement?

If you mean to go so far as porting and what not yes, but a bolt on exaust is minimal gain on a N/A rotory, as well these b.s cold air intakes.



Only reason its such a great gain on lets say a otherwise stock TII is because it will let the car boost more.

full exhaust on a n/a adds a shitload of power

it looks like the hp on the rx-8 is going to around 250... they want it to be close to the fd... and if you read anything about the ucoming rx-7 (fe?) youd have seen that it will be between 280-300hp and 200-300 lbs less than the rx-8. think of the rx-8 as an opening act for the (fe) and a reintroductin of the rotary. mazda once again has to prove that the rotary can be reliable and attain proper fuel economy. personally i dont really like the 4 door idea anyway. i just like the rx in the title.. the 8 isnt good though.

now all we have to hope is that enough people buy the 8 for them to produce the 7

https://www.nopistons.com/forums/pub...IR#>/dunno.gif

full exhaust on a n/a adds a shitload of power[/quote]

Um no it doesnt, Racing Beat even says 5-7 hp so If you think thats a **** load of HP then your crazy.



I think people like to THINK it adds alot of HP on a N/A because they try to justify spending the money.



RB cat back exaust

on a brand new car with good cats it probly only adds 5 hp... but when you figure in replacing or just removing clogged cats and or leaking pipes id figure it to be more around 10-15.. although still not comparable to the gains you see on a turbo

Exactly, kinda like when they test a K&N filter, they test the car with the old shitty dirty clogged filter, then they put a K&N in and say it added 6 hp, meanwhile ANY new air cleaner would have added 6hp, lol.



Still 10-15 horsepower is hardly a "shitload of horsepower" as someone called it.



If I didnt have to replace the mufflers on my car because they were rotting out I wouldnt have bothered with my exaust, but of course once I did I always have to go overboard.

I never heard it would be 280HP, where was that? Statside mag?



Anyway, I have been hearing for a while in Japan 250HP, as per Mazda...



Jason

www.jt-imports.com

from what I read (Car and Driver about 5 hrs ago) NO turbo https://www.nopistons.com/forums/pub...O_DIR#>/11.gif Since they changed the ports and all the other crap, with turbo the exhaust gases would be too cool for the catalytic converters to do anything, therefore killing emissions and u know they won't let em get away with that, but still, they brought back the rotary (THANK GOD)

so maybe they can pull another one out of their asses.... just my 2 cents https://www.nopistons.com/forums/pub...IR#>/smile.png

What stats do you have to prove this statement?

If you mean to go so far as porting and what not yes, but a bolt on exaust is minimal gain on a N/A rotory, as well these b.s cold air intakes.



Only reason its such a great gain on lets say a otherwise stock TII is because it will let the car boost more.[/quote]

that 5-7 HP statement, from HERE is not the entire exhaust. This is just cat back. On an NA, exhaust modifications DO give large performance increases, however, cat back is the minority of the OEM exhaust system bottlenecks. First, you have the bathtub style manifold, this needs to be replaced with a header. This particular header also eliminates the other major bottleneck(s), those two pre-cats. Next, if you want more, you get the presilencer. After that, the cat back is a significant bottleneck and you might as well get it.



All of these variables are relevant when you mention 'exhaust system', and are probably the MOST significant on an NA short of porting and switching to forced induction.



Personally, I think the fact that they claim the cat-back adds 5-7 HP on an otherwise stock FC is quite surprising, that manifold is designed to quiet things down and is horrible for performance. Those 3 cats don't help either, especially considering most 2nd gens are old and have been burning oil for so long at least the first cat is clogged by now, I wouldnt think the cat-back parts would make any difference at all.



Exhaust mods on an NA are very important if you want to go fast, but if you have an otherwise stock system, you can spend all the money you want on cat-back and the gains will not be significant, because it's not the bottleneck at that state. This does not mean exhaust system mods do not have gains on NA rx-7's, not much could be further from the truth.

full exhaust on a n/a adds a shitload of power[/quote]

Um no it doesnt, Racing Beat even says 5-7 hp so If you think thats a **** load of HP then your crazy.



I think people like to THINK it adds alot of HP on a N/A because they try to justify spending the money.



RB cat back exaust[/quote]

i didnt say CATBACK i said FULL... meaning no cat and a racing DP

The 280hp figure comes from what the RX-EVOLV was said to produce, at 10,000 rpm.



When the RX-8 debuted, Mazda claimed it would produce 250hp. Mazda never claimed 280hp for the 8, so it's only really "lost" 3hp.

i dont know where they saw 247 but ive seen 250 everywhere. and as i said b4 the rx-7 will have closer too 300 as reported by motor trend... and it will weigh 300 lbs less.... in other words 280 hp 2600-2700 lbs

Guys you have to remember cars performcae is not just about Hp but weight also. And the rx-8 is a few hundred pounds little the the new Z. Rx-8 about 3000 lb Right? Get a high flow cat and intake. It will get an extra 10 hp. An Ignition box box might sqeeze a few more and imporve fuel mileage.

Oh sorry 2600 to 2700 LB on 250+Hp sounds like it can kick so ass still





the new Z still floating around 3200..........so do the math





3200-2650=550 lb dawm that like having a sumo wrestler in you car

Car and Driver tested the RX-8, ran a 14.9, the 350z runs a 14.2, and you can mod either car so thats not right to say "add a few mods blah blah"



You forget the 350z has a 100+ft lbs of torque advantage over the RX-8.



And Bigtime- first off its only a downpipe if the car has a turbo.

The most noticable gain that MazdaTrix has gotten on a N/A is to use the header and dual silencer/exaust combo, they did get about 35hp to the wheels, thats if you want to lay out over $1250 for thier system and figure out a way to wire your 6ports and also remove all your converters on the car.

yeah its quite obviuos the rx-8 cant compete with the 350Z. itll run with a audi tt or boxster but thats about it. the 350z is just more performance oriented. mazda went soft on this one.

I head the 350z has liek a superlow emmisions and has no cats whatsoever

I know for a fact that a full exhaust will give more HP for a N/A rotary! I live in Denver, have a GSL-SE, my cousin drove the car up 4k feet to the mountains, we installed headers, replaced cat with test pipe, and ran straight pipe out the back (yes it is obnoxiously loud!) and the car is noticably faster, and far more torqey (sp?) that before, and that is 4000 feet higher in altitude. It will flat outrun my 97 N/A stock Eclipse, and before that was a close race. Also I don't think the Rx8 was really designed to run against the 350Z, the 350 is a 2 seater, the 8 is a 4 seater, it is better matched to cars like the Altima (4 seats, 240hp), IS300 (4 seats 220hp?) It is a 4 seat sports car, if they produce another 7 (please please please) that will be the comp for the 350Z. Just my $.02

Just a quick thought, so feel free to point and laugh...



A few years back, Mazda put an axial-flow turbine in for the turbocharger in one of their sedans. I have no idea which one, I left the article about it back home over the holidays in stead of bringing it to my folks' place. Most cars use a radial-flow turbine hard-mounted to a radial flow compressor, due to size and weight restrictions. Now, I haven't worked enough with radial-flow turbines, given what I do (jet engines for airplanes) to know offhand how that will do with a cat. But wouldn't that be a place to start for looking for a few hp?



And yeah, I know that getting the mechanical power (rotation) from the turbine to the compressor spool will be a bitch-and-a-half. But hey, back then Mazda came up with a solution that can maybe get tweaked by somebody if we can find a manual for that other car.

does anybody realize that the RX8 is just a family "sporty car"

if mazda wanted to make a performance car don't you think they'd make it have more power

I think the best way for Mazda to get forced induction for the next 7 would be a supercharger, I have seen it done to 1st Gens with good results and it helps with both Torque and HP increase, and it is a linear increase in power that is more reliable than turbos.