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Greetings All.

Im doing a little research into what sorta stuff I'd need and a rough price estimate for each item. But here is my Question . . . Using RPW's twin turbo kit, which do you think would be better?

3" Cat-Back Exhaust
3.5" Cat-Back Exhaust
Twin Independant 2" Exhaust (i.e Two Cat-Converters . . . Two Rear Mufflers, etc.)
What do you guys think? I want the best fuel economy I can possibly get, while still retaining a fairly quick and powerful car. Im also unsure on the turbo config I should use. Mind you, the donk is a 3.0L Mivec, that I wanna get some custom cams done to make the engine more 'turbo friendly'.

Twin GT-28 Garret Ball Bearing Turbos
Sequencial GT-25 Garret Ball Bearing Turbo + (GT-25R Or GT-30R) Garret Ball Bearing Turbo
Any Ideas People? I figured that with the Seqencial turbos I could have them 'switch' over when the cam lobes change. . .fun and technical.

Hmmmm....Food for thought....
Cheers,
--Tonba
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Don't go with sequential. Any manufacturer that has tried it ... has soon ditched it.

Besides if your using the RPW kit its a turbo for each bank ... not the go for sequential.

I would think 3.5 is gonna be the best option long term on the exhaust, especially if your going to crank out insane ponies.

If your up for an RPW kit ... talk to Dave, I am sure he will steer you in the right direction.

Given a choice, I would go for GT28s as they are about the same price as GT25s.

good luck decompressing the mivec engine without loosing all yur money there
ive thought bout doin that, but i think the mivec runs a high compression as it is :confused:
speak to dave bout it i rekon

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Greetings All.

I have tryed to talk to him about it . . . but i cant get enough info at this stage. Dave seems to think that a decompression gasket will fix the high compression. Pair that with the modified 'turbo' camshafts . . . It should in theroy run slightly better then the 3.5L SOHC.

Cheers,
--Tonba
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Sounds a bit like engineering for engineerings sake.

Pair that with the modified 'turbo' camshafts . . . It should in theroy run slightly better then the 3.5L SOHC.
Why would you bother taking away the advantages of the Mivec engine? I mean, it's high compression and you're going to decompress it just for boost. It's got a second set of cams to get greater lift / overlap which is going to cause half your boost to flow right through the cylinder and never get used. Unless you just use the 3.0 as a DOHC and disable the Mivec and run with some turbo cams and take advantage of the DOHC.


Sounds a bit like engineering for engineerings sake.
Agreed.

Where's this engine coming from? How much? Is it here yet?

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Greetings All.

No...It would work like a normal turbo 6g72, BUT with another set of lobes and another set of cams. Now, im planning to get some custom cams done, that will eliminate the overlap, and create them to be a Hybred of the MIVEC and a Turbo. Thus giving the Turbo less power down low (Due to cam profiles, effectivly giving me less power to loss traction with :D ) and more power up high with a second cam profile. Im also doing some research to see if a EVO 7-8 six-speed manual can mesh with the donk.

Either I do that, or I disable the MIVEC and just use it as a DOHC....

Hmmmm....
--Tonba
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[QUOTE=TonbaNo...It would work like a normal turbo 6g72, BUT with another set of lobes and another set of cams. Now, im planning to get some custom cams done, that will eliminate the overlap, and create them to be a Hybred of the MIVEC and a Turbo. Thus giving the Turbo less power down low (Due to cam profiles, effectivly giving me less power to loss traction with :D ) and more power up high with a second cam profile.[/QUOTE]
There are easier and cheaper ways of achieving this. You can electronically control boost levels depending on gear or RPM or whatever you want. The fact that the turbo hasn't fully spooled up will have a greater bearing than cams with power like that.

I know I'd definately rather a TT SOHC than a TT Mivec engine.

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Greetings All.

Hmmmm, but wouldent I be getting more power, out of the modified MIVEC block?

Cheers,
--Tonba
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sounds very experimental, are you sure you want to be the first to do such a thing, or at least the first you know of :confused:

although it does all sound good in theory with the cams stages. no guts no glory! i say try it. worst u can do is have to walk to work

Hmmmm, but wouldent I be getting more power, out of the modified MIVEC block?

Potentially, but the Mivec component could also be what's going to rob you of power. Under a high amount of boost, when the valves overlap in their open / close cycle half of it's just going to blow right on through. Mivec is for N/A tuning and N/A is a different kettle of fish when compared to forced induction. Mivec gets greater overlap to cause the exhaust gasses to suck more air in but if it's being forced in the same situation, the pressure will just head back out before the valves closes and it will be wasted.

I'm not saying don't do it because people have successfully turbocharged VTEC engines but what I'm saying is that it's going to make it harder to achieve a desired result. Even DOHC in N/A trim possibly isn't ideal for forced induction if the seperate timing provides overlap and the camshafts design isn't taken into account and 'turbo' cams fitted.

It's all good and well picking a high power engine to start with as a good bench mark, but if you don't consider how it achieves such a peak and look into it's trickery, they you're going to waste money and time.


sounds very experimental, are you sure you want to be the first to do such a thing, or at least the first you know of :confused:

although it does all sound good in theory with the cams stages. no guts no glory! i say try it. worst u can do is have to walk to work
Hmmm... it could well work and trying is the only way to find out but I'd be talking to those with DOHC, Mivec and VTEC to see what issues and thought processes you have to go through. Check out the forums on MOGWA as there's a thread about supercharging a Mivec in the General section.

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Greetings All.

Well...ive thought long and hard about it, and i think i will put the turbo mivec idea to rest. Although I've come across another problem. To fully work a N/A MIVEC six speed, or to turbo and fully work my current 3.0L donk and drop a manual five-speed in....

Cheers,
--Tonba
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Hey Guys.
Has anybody considered investigating two different sized turbos's for a TT setup? Very similar to the Subaru Liberty B4. They have twin turbos, and as one is smaller than the other, it spools up quicke, producing a low boost at lower revs, and then when the larger turbo spools up, at higher revs, it creates higher boost. I think it would be a good, but expensive setup to develop for a Magna, but quite a good option.
What do you guys think?

Hey Guys.
Has anybody considered investigating two different sized turbos's for a TT setup? Very similar to the Subaru Liberty B4. They have twin turbos, and as one is smaller than the other, it spools up quicke, producing a low boost at lower revs, and then when the larger turbo spools up, at higher revs, it creates higher boost. I think it would be a good, but expensive setup to develop for a Magna, but quite a good option.
What do you guys think?

Kinda like a Sequential setup?

SuFz :rant:

Sequential is not the go. The manufacturers have never got it working 100%,

BUT, I reckon variable pitch turbines would make for a mean turbo!!!!!!

Sequential is not the go. The manufacturers have never got it working 100%,

BUT, I reckon variable pitch turbines would make for a mean turbo!!!!!!
Yeah, look at the B4. Probably the best example / result of why you don't do it. Why do you think the GT did away with it?