neit_jnf

It's already been done on the 350Z (10.1:1 compression) @ 5.5 psi, no water spray, pump gas... yes on the big a$$ IC and don't know about the fuel maps.

wakeech

:p c'mon, if you're gonna do it at all, do it right... 5.5psi is almost a waste of time... why not just go all motor?? if i'm gonna boost the motor, i'd spend the money and do it right.

i'm not raggin on you at all, but i personally think it's a pretty stupid thing how tuners like Greddy make this wimpy little kits for a ton of money that offer so little in increased performance when there are other solutions about... it's almost putting a turbo on your car just to say it's a turbo. poseurism. don't like it.

i sincerely hope that Rikki & Co. go all out and make something serious for the peoples...

blizz81

keech - Id guess for a lot of people it's probably that indecisiveness caught in what you want to do with a daily driver...but I'm with ya, if I was wary like that, I'd stay away from FI altogether if I was going to get the 'boost' of an eBay electronic supercharger in the end :D

Some people just want to hear that BOV no matter what..

Efini 8

no point in paying $4000 for turbo kit that only boosts 5.5 psi - that is lame. our compression ratio is not that hard to work with, but it will take some long hours of r&d.

DijabutiA

isnt the rotary's lack of engine tempature tolerance a bad combination with a turbo? shoulds like a mistake to me
i think you guys are better off looking for NA solutions or just waiting for the rx7

Sputnik

You're way off. The rotaries handle the heat fine (thankfully so, because they create enough of it). The reputation of issues with high underhood heat comes from the 10s of rubber vacuum hoses associated with the sequential twin-turbo setup of the FD RX7. They would fail due to the extra heat, and were very difficult to troubleshoot.

---jps

rx7aggie

my FC TII RX-7 runs at 6 psi stock. did mazda waste their time boosting the '86 FC, pushing power up 40 hp to 186 hp? nope, these cars still blow the doors off new cars, mine does so reguarly :D

and there is no reason mazda can't simply add lower compression rotors to the renesis when turbocharging, that's what they did with the FC

Red Devil

I had a FC TII years ago, I remember it running at something like 8.5 psi stock. Maybe my memory is fading.

If I was to use forced induction in the 8, I would like to see around 10-12psi capability.

neit_jnf

It's not only about boost pressure but air volume flow as well. The Greedy 350Z turbo kit @5.5 psi surely moves lots of air since they got a 90 whp gain with it, using stock exhaust.

By the way, I don't have a Z or plan on getting one or have any connections with Greedy. I'm just saying that a turbo kit when done right can have lots of power gains even at lowish boost pressure levels thus helping with durability and reliability.

I can't wait to see a bolt on turbo kit for the 8!! :D

wakeech

the gain in power is big because it gives the VQ some legs in the upper end, and it's three-and-a-half friggin' litres of engine ("gi-normous" i believe is the correct term), obviously there's going to be some serious torque gains for a small increase in charge density.

the total amount of air you're crushing in, which is best measured by mass (like kg/cc or whatever). the exhaust couldn't have been "stock" otherwise they'd never be able to throw a turbo in there. if you mean from the cat-back it was stock, that's a different story, but it's not stock.

i did write a reply to the post about the TII only having a handful of psi of boost, but it got killed by the server, and it was 12.30am... i didn't want to retype it, so i will now:

the reason that Mazda only put a little bit of boost on the TII's, or really why any manufacturer only puts "a little" boost on anything, is becuase they had to make it clean, economic, drivable, and CHEAP (for enhanced profitability, which is the name of the game).

when a tuner goes to the trouble and cost of changing their car, enhancing some characteristics over others (this case being power), they're quite willing to forego some if not all other attributes for one at (sometimes) a considerable cost. this is why i say spending several THOUSAND dollars for a measly 5.5psi is stupid, where you could spend another thousand or two on top of that, and end up with a much better motor in the end.

in any case, i just dislike "complete" or "comprehensive" kits... to do it right, you gotta do it yourself (or at least know what's being done).

wakeech

one word: cost.

now, i really dont' believe that'll stop them if they're going to make MPS engines turboed from the factory (probably not), but for a kit for RX-8's that're already being made, how is Mazda going to put 9.0 rotors in them??

this supposed kit we're talking about is one for the aftermarket, meaning that unless you're going to rebuild the engine completely to then build it up more (in which case there's no way you're going to buy some kit for the build up).

N20SA22C

I was under the impression that the Rx-8 was only 9.2:1 compression ratio? I am looking now for where i read that but i will be back to be for sure.

N20SA22C

I'll be dammed, nope its 10:1 sorry i appoligize

Efini 8

also you have to consider comparing the greddy 350z turbo kit is that they also used electronic management with various electronics and also have bolt on modifications, surely they can do better than that. Power a company in Japan has already made a considerable twin turbo kit that surpasses Greddy's performance gain figures. Which goes to show, many companies choose to go different directions in which they think people will buy. Greddy typically makes bolt on kits which do not require much tuning, they aim for the DIYers that are not too familiar with the technical aspects of turbocharging a vehicle. Simply said, I believe I would spend my money on the most bang for my buck. There is still hope though...

rx-8club.co.uk

I have read a lot about it, but have not seen/heard any evidence of it actually happening as yet.

Be great if someone knows out there?

j-apex rx

i own a rx7 twin turbo and i will never get a turbo car again .only if i win lotto or make more money because if you guys didn't know is alot of work to keep a turbo car running perfect. better of with a supercharger . i have a millenia s and never had a problem with it .

rx7aggie

6.56 psi on a stock S4, ~8.25 psi on a stock S5

rx7aggie

it runs off the miller cycle, NOT the otto cycle. the intake valves remain open during part of the compression cycle. you cannot compare a miller cycle supercharged piston engine to a sequential twin-turbo otto cycle rotary engine!

that's like comparing deseil to a two-stoke otto cycle.

dcfc3s

I'll put it this way - somewhere in Japan someone is feverishly working on one. Japanese *LOVE* turbos, and they love the RX-8. It's just a matter of time.

One thing that's weird for the Japanese - domestically, the RX-8 is the first non-turbo rotary since the 1st gen RX-7, and even then they had a turbo 1st gen at the end of the production run. All 2nd gens sold in Japan were turbo, as were 3rd gens, as was the Cosmo.

I also wouldn't doubt that HKS and/or Greddy will come out with a conservative turbo kit at some point.

Dale

wakeech

wow, really?? neato. i s'pose that's why there're so many JDM engines available for cheap.

wakeech

"here" meaning Peter Farrel Supercars.

dcfc3s

Yep. Takes some people time to get their heads around that...

It's funny - in the US, the 2nd gen turbo was fully loaded - power everything, nice 16" wheels, nice stereo, you name it. In Japan, since all cars were turbo, they had a turbo base model. I've got an '87 Japanese dealer brochure (took me a while to get my hands on that sucker! ) that outlines all the models.

The base was the GT. Steel wheels, no hubcaps, no sunroof, cheap seats, crank windows, manual mirrors, you name it. SUPER basic. But, it did have a turbo .

Anyhow, getting WAY off topic...

Speaking of, I remember watching an Option video soon after the new Toyota MR-2 Spider was released. They were driving around in one with a Blitz turbo kit - that car was still way new at the time. There's probably other examples, but the Japanese aftermarket industry is *HUGE*. Just take a look at Eastmoon's group meeting photos - pretty much every RX-8 is modified at least a little. It's VERY hard to find a sport/sporty car in Japan used that isn't already modified at least a little - wheels and exhaust at least.

I predict that in one year, there will be at least 3 turbo kits available for the RX-8 in Japan. Some may or may not be over here or commonly available by that point, but they WILL be made, trust me .

Dale

Digisan

Yup

twifosp

Hey Americans *LOVE* turbos too!

Snails rule!

(Unless they happen to be working in a twin-sequential configuration with ~70 some odd vacuum hoses, restrictor pills, check valves, solenoids and other crap. ) :D

RedLineAt9

do u think that u wud be able to supercharge or turbocharge the 8? want feedbak!!!!!