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RB25 / RX7 Hybrid TURBO ?

Cameron_Datto
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Cameron_Datto Contributor

Cameron_Datto

Posted
Posted

Hi Hot4`s/ JapanesseMotorsport , did a write up years back on using a Mazda RX7 turbo Core and exhaust wheel and To4 compressor wheel .. Has any one used this turbo set up .. as it seemed a good stage 1 up grade from the Std RB ceramic Turbo.. If any one has a good stage 1 turbo up grade for the RB25 around 200kw at the wheels .. let me know .. Cheers cameron

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https://www.sau.com.au/forums/topic/37168-rb25-rx7-hybrid-turbo/
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Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

ive just built this turbo for myself.. Funny this.. I was going to ask but didnt bother.

I got a rx7 turbo given to me with hitachi core... and i got a t04 60 front cover with backing plate with i believe is a 60mm ??? not too sure... its 6.0ar or something...

Anyway i stumbled across a 300zx rear housing single turbo vg30 and sent the turbo down to a guy in sydney who put new size bearings in it and machined out the rear housing and cropped the rear wheel and fit the t04 front.. all this for around $700

This turbo should flow lots of HP as apparently the rear is supposed to be a .84 which is a decent size rear....

Anyone have an idea on what HP it would run on a rb25det pfc frmc etc etc

lukits01 Experienced

lukits01

Posted
Posted

So you'll be using VG30DET turbine housing and stock RB25DET compressor housing?

would this upgrade be possible using the standard RB25DET rear housing?

Just wondering which RX7 turbo would you use?

Isnt the series VI and above twin turbo?

Im guessing its the ones before that?

matlowth Proficient

matlowth

Posted
Posted

I did this to my Skyline about 2 years ago... Response is only marginally worse, and the car made an extra 20-25rwkw (this was with cooler,pfc,exhaust,etc). Peak power was 206 rwkw from memory.

IMO - If you're pulling the turbo off yourself (like I did) then it's a worthwhile thing to do, however if you're paying someone to do it, save a bit more and buy a turbo that gives you more room to grow.

When you have 200rwkw - 200rwkw isn't enough! :(

Cheers,

matt

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

I actually changed the front housing to a T4 60 a/r front with t4 wheel it looks massive.

rear is a large 300zx vg30 single turbo housing machined out to suit the rx7 rear wheel.

my old turbo was a small vl with a t4 front wheel machined into it and it mate 213 rwkw so im sure this upgrade with the larger rear housing and rear wheel and larger front housing would bag allot more RWKW ???

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted
So you'll be using VG30DET turbine housing and stock RB25DET compressor housing?

would this upgrade be possible using the standard RB25DET rear housing?

Just wondering which RX7 turbo would you use?

Isnt the series VI and above twin turbo?

Im guessing its the ones before that?

Yeah I am using the larger 300zx vg30 rear housing.. but you can use the RB25DET housing if you want. There are 2 types of rb25det housings one is bigger then the other. If you got the big one then it would be good you just got to get it machined out to suit (not 100% sure if the housing is big enough to fit the rx7 rear wheel.)

so really this turbo of mine is a 60 front and .84 rear.. i think...

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

the water lines fit fine.. the oil in on the turbo needs an adapter put on it that will allow you to use a banjo fitting oil line then it fit without any hassles.

after a cooler upgrade and this turbo the car has more power on 5psi then it had on 10psi

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted
so both Series 4 or 5 core would work?

would the oil and waterlines need to be modified?

What kind of compressor wheel are you using? and how's the response with the turbo?

I dont know what the compressor wheel is the front is a garret t04 6.0A/R it would have a 55mm wheel? 60mm?.. but it looked really big compared to the old rx7 front wheel....

The rx7 rear wheel is massive, compared to the vg30 rear wheel it looks over twice the size... It was also cropped

you could easily build this turbo for under $900

post your email adress's i can send photos of the turbo

S3_Girl Enthusiast

S3_Girl

Posted
Posted

My partner built this turbo for a friends vl a couple of years ago.

Vg30 exhaust housing, Rx7 core and exhaust wheel, T04E compressor, .60 comp cover. it made 237rwkw on a standard vl turbo motor on 15psi. Mods were 550cc injectors cooler,computer etc. Using the V-trim compressor would be better again. i'm probally going to use this on my R31.

autObarn Enthusiast

autObarn

Posted
Posted
I did this to my Skyline about 2 years ago...  Response is only marginally worse, and the car made an extra 20-25rwkw (this was with cooler,pfc,exhaust,etc).  Peak power was 206 rwkw from memory.  

 

IMO - If you're pulling the turbo off yourself (like I did) then it's a worthwhile thing to do, however if you're paying someone to do it, save a bit more and buy a turbo that gives you more room to grow.

 

When you have 200rwkw - 200rwkw isn't enough! :P

 

Cheers,

 

matt

i too agree, i alll too often see these hybrids on customers/friends cars and they are usually dissapointing, especially as $900-1100 on some bittsa turbo is a fair chunk out of the price second hand hks gt seriesor a new proven package. prices on tried and proven products are much better now than they were a couple of yrs ago. 400-450hp bolt on turbos kits such as the trust TD05SH-18g and hks equivs are selling new from around $2900- $3000 but its not just the power they make, more imortantly its the spread of power and the area under this power line which more than makes up the difference in price. all i can say is score a ride in a few different cars with differrent setups. (shops like JMS, d1GARAGE and ourselves usually have customers more than willing to show off their toys). if 210kw is where you want to stop a hybrid may well be worth it.

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted
i too agree, i alll too often see these hybrids on customers/friends cars and they are usually dissapointing, especially as $900-1100 on some bittsa turbo is a fair chunk out of the price second hand hks gt seriesor a new proven package. prices on tried and proven products are much better now than they were a couple of yrs ago. 400-450hp bolt on turbos kits such as the trust TD05SH-18g and hks equivs are selling new from around $2900- $3000 but its not just the power they make, more imortantly its the spread of power and the area under this power line which more than makes up the difference in price. all i can say is score a ride in a few different cars with differrent setups. (shops like JMS, d1GARAGE and ourselves usually have customers more than willing to show off their toys). if 210kw is where you want to stop a hybrid may well be worth it.

With a VL turbo with t4 front wheel on my rb25 i made 213rwkw with a supra intercooler.. upgraded the cooler and upgraded to this turbo for a total cost of $2000 for a front mount and turbo to get around 250rwkw as apposed to spending $3000 on a kit then you still got no intercooler...

I just want street performance and a few runs down the strip..

Once i get the motor fixed and get it tuned we will see what she makes...

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