Why Does It Keep Losing Hp?
12-10-2002, 10:21 PM
#11
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Originally Posted by Rob x-7' date='Dec 10 2002, 05:17 PM
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.
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.
12-10-2002, 10:56 PM
#12
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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
now all we have to hope is that enough people buy the 8 for them to produce the 7
12-11-2002, 04:38 PM
#13
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Originally Posted by bigtime' date='Dec 10 2002, 11:21 PM
[quote name='Rob x-7' date='Dec 10 2002, 05:17 PM']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.
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.
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
12-11-2002, 05:11 PM
#14
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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
12-11-2002, 09:03 PM
#15
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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.
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.
12-11-2002, 10:52 PM
#16
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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
Anyway, I have been hearing for a while in Japan 250HP, as per Mazda...
Jason
www.jt-imports.com
12-12-2002, 02:43 AM
#17
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from what I read (Car and Driver about 5 hrs ago) NO turbo 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
so maybe they can pull another one out of their asses.... just my 2 cents
12-12-2002, 02:48 AM
#18
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Originally Posted by Rob x-7' date='Dec 11 2002, 01:38 AM
[quote name='CSP12a' date='Dec 10 2002, 08:31 PM']
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.
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.
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.
12-12-2002, 09:26 AM
#19
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Originally Posted by Rob x-7' date='Dec 11 2002, 05:38 PM
[quote name='bigtime' date='Dec 10 2002, 11:21 PM'][quote name='Rob x-7' date='Dec 10 2002, 05:17 PM']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.
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.
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
12-12-2002, 12:06 PM
#20
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Originally Posted by JT-Imports' date='Dec 11 2002, 08:52 PM
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
Anyway, I have been hearing for a while in Japan 250HP, as per Mazda...
Jason
www.jt-imports.com
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.