Jump to content
SAU Community

RB25 / RX7 Hybrid TURBO ?

Cameron_Datto
 Share

Recommended Posts

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

Link to comment
https://www.sau.com.au/forums/topic/37168-rb25-rx7-hybrid-turbo/
Share on other sites
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...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Murray_Calavera
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By Murray_Calavera · Posted

      @joshuaho96 Hmm considering the drama you've seen/experienced, have you looked into getting a built complete long motor shipped from Australia?  Considering the AUD is basically monopoly money when compared to the USD, at a glance this seems like a good option?
    • Shoota_77
      R32 GTS-t RB30 sedan

      By Shoota_77 · Posted

      Bloody Skylines, they put you through the bloody wringer! Stick at it! Stunning drag strip BTW! Where is it? Can see part of the name on the slip and probably should just Google it!
    • joshuaho96
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By joshuaho96 · Posted

      I mean the other day I had to walk someone through diagnosing why their timing belt was walking off the cam gears. At least one of the issues was a bent tensioner stud. Local mechanics have found runout on the CAS mechanism causing weird failures. I'm also no saint here I've documented some of the things I've had to learn the hard way. Something I discovered recently is that my CA emissions catalytic converters weren't even welded correctly to align the downpipe to the main cat and they tossed the support bracket that goes from the transfer case to the downpipe to support everything there. I spend a lot of time chasing down these decidedly unsexy problems and the net effect is it feels like I never actually get to the original objective (flex fuel, VCAM, oil control, cooling, etc).
    • r32-25t
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By r32-25t · Posted

      At times with how you make everything sound, all I imagine Americans doing when they see a gtr is standing there looking at it and bashing it with a gun like how a caveman would with a club and hoping it fixes itself 
    • joshuaho96
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By joshuaho96 · Posted

      I think this is just a product of how the US market works for this stuff. Shops are expensive and there's no real way of knowing what kind of results you're going to get, people don't really have the institutional knowledge. I have heard too much at this point to really put faith in anybody "full service" except maybe DSport and they aren't really a full service kind of shop. If you go to the right place I have no doubt they'll get it right for you. Some locals have set it up right but the cost really is nuts and even now they're still fighting issues. And you know I'm a crazy person who thinks things like twin scroll, relatively short low-mount cast headers, PCV recirc to intake, recirculating BOV, right-sized for ~400 whp, MAF load, validating all of that to a standard comparable to OEM test programs, etc are relevant. For what it's worth, multiple local owners at this point have been stuck in a perpetual cycle of blowing a motor -> getting someone to rebuild it -> some missed detail causes the bearings to wipe and spin just outside of break-in mileage or drop valves or some other catastrophe -> cycle repeats. I usually only find out about this because I'm perpetually helping random friends with diagnosing car troubles, Skyline or otherwise. The single turbo stuff if I'm honest is mostly secondary, it just doesn't seem to achieve the numbers in the ~2000-3000 rpm region that I would expect given the results I've seen here or in Motive's videos. I don't really know what we're missing here in the US to be causing this. Lots of people like to emphasize the necessity of finishing the project first and foremost, but I'm not made of money and I can't afford to be trashing a 15k+ USD engine build with any regularity. Or spending my relatively limited garage time these days unable to triangulate problems because too much was changed all at once. Also, even if it isn't a catastrophic failure I would consider spending the cost of single turbo conversion with nothing to show for it to be pretty bad. 
×
×
  • Create New...