Adamrotor

Why are all the tunning companies scared to put on a bigger better stronger turbo on the car with more psi, why cant they try and see what happens? Maybe even go twin turbo why?

Tigster

I vote engine management

rotarygod

Up to very recently the engine management systems couldn't do a very good job of controlling even small boost. If you can't tune small, you can't tune big. It's obvious what will happen if you go for more at that point. We are only just now seeing full ecu control being realized so you will see power numbers climb. It's not that anyone is scared.

zoom44

what would be the point exactly of twins?

Aoshi Shinomori

Uhh two is better than one Zoom...duhhhhh! :p

Edit: What would be so bad about a sequential setup? Something sized similarly to the greddy and then another sized closer to what SSR is using? I'd assume it would be tough to fit, but it would be a pretty fun setup, no?

DARKMAZ8

quicker spool up.

Adamrotor

The 3rd gen was a twin why not this something to look forward to.
thanks for the posts.

zoom44

nahh it wouldnt be hard to fit you just wouldnt make any mor epower any quicker than you could with one and complexity negatively affects reliability. ask scotty.

zoom44

you can get just as quick of spool up from a good single nowadays ad you could with twins when they stuck them on the 3rd gen. so there isnt any point really. check the amount of 3gen ownes that have gone to single setups.

Aoshi Shinomori

I was under the impression they went to single just to get bigger gains. I was just thinking you could tune the one turbo for lower rpm and the other for higher rpm power. I'm definitely no expert just thought I would ask. Thanks

rotarygod

The 3rd gen twins were a very unreliable and problematic pain to deal with. They were over complicated and gave Mazda a very bad reputation. When they worked good they were just wonderful to drive. I seriously doubt Mazda will attempt to do something like that again. With forced induction technology the way it is now, there really isn't much of a point in doing twins on a car anymore. Mazda even admitted that the twin system doubled the price of the engine on the 3rd gen. Overly expensive and unreliable do not add up to a combination that we will see again. Twins are over rated anyways. It's more bragging rights than anything but it does drive nice when it works properly.

Aoshi Shinomori

The man has spoken. Thank you sir, I can always rely on you for answers like this.

rotarygod

Damn it Aoshi, I'm not THE god. It's not all gospel.




I'm just A god!

Aoshi Shinomori

Dude! You're omniscient and you wail on your axe!! Teh godness. :p
Anyway, so twin turbos wil probably never be seen from the factory again? So what are the advantages or say, the twin turbo kit from Greddy on the 350Z? Just bragging rights?

zoom44

hey since i said it first doesnt that make me greater than him?

greddy is using 2 to run 1 from each side of the v yes? not for spool time or anything like that and its only 5-6 psi of boost. probably for heat or packaging . and bragging rights :D

Aoshi Shinomori

You're a god too Zoom I forgot about the whole two banks of a V6, whoops Anyway thanks for answering all my questions guys

mike1324a

So how high do you think those numbers might go?

mikeschaefer

This is no definitive answer but:

I don't see why the numbers can't get as high as they were with RX-7s. It's basically the same engine except that now both intake and exhaust ports are on the side. It's still extremely strong as far as I know so why couldn't someone just turn the boost way up and dump in a crapload of fuel?

tuj

Because of our compression ratio.

zoom44

that just means you cant pump the same psi. but that is no reason to assume you cant reach teh same HP numbers

tuj

Stock FD-like hp numbers are attainable with the Greddy or other smallish turbo and good tuning. I thought he was referring to the large amounts of hp that the FC's and FD's could make (think 350+). Its not uncommon to hear of FD's running 500 hp. I don't think that will happen on the Renesis without lower compression rotors.

Static compression limits the amount of boost. Less advance will only help so much. The zero-overlap of the Renesis is a BENEFIT to FI, but the CR isn't.

DreamWarrior

Twin and twin sequential are different, yes? The twins on the 350Z are not sequential, right?

I'd guess they used them on the 350Z for better flow exhaust flow; collect after the two turbos rather than collect before a single turbo. No?

mike1324a

The 350z is also a v6. It has 2 banks of 3 cylinders so its just easier to have 2 turbos. There is a single turbo for the z but the piping is complicated so twin turbos are just easier.

mikeschaefer

Doesn't higher compression mean that you are compressing the mixture more? Therefore does it matter if the rotors are compressing the mixture or if the turbo is compressing the mixture? You're still getting compressed mixture. I mean there is still a certain pressure point where you'll get detonation.

I don't know the equation or anything and I didn't pay attention in college physics but for some reason I would assume that rotor (or piston in the case of a reg. engine) compression and turbo compression affect detonation equally.

zoom44

yes exactly mike. compression is compression doesnt matter whether its an SC or the rotor.