Jump to content
SAU Community

Effect Of Smaller Comp Housing.

Daboss

By Daboss,
in Engines & Forced Induction

 Share

Recommended Posts

Daboss Experienced

Daboss

Posted
Posted

Hey forum just a general knowledge question here. I used the search function, but found no topics on the subject. I just would like to know what effect what a machined 3076r comp housing have on a gt35r?

Faster spool, slower spool, same spool, less horsepower at same boost or same horsepower at same boost?

Link to comment
https://www.sau.com.au/forums/topic/340336-effect-of-smaller-comp-housing/
Share on other sites
VB- Veteran

VB-

Posted
Posted

think i read a while ago from someone of the xr6t persuasian that swapping from .5 to .7 on a gt35 is worth 20 or 40 kw in the top end or someting, not a massive amount... i'd imagine spool would be effected relatively proportional to power

Daboss Experienced

Daboss

Posted
  • Author
Posted
think i read a while ago from someone of the xr6t persuasian that swapping from .5 to .7 on a gt35 is worth 20 or 40 kw in the top end or someting, not a massive amount... i'd imagine spool would be effected relatively proportional to power

Hmmm so where would the .6 get you? Would you still have the top end capability of a 35r with a somewhat quicker spool time? Or would the effect be negligible? Would it still make more power than a 3076r of the same specs?

StealthX Veteran

StealthX

Posted
Posted

That hybrid 35r would prob make better powar than a 3076r, purely because it's got the larger rear, and less exhaust restriction.

I'd say response would be the same, the comp. wheel's inertia is the same, and the hot side is unchanged.

However you'd probably make more/better power at lower boost levels, and I'd imagine less power at higher boost levels.

i.e. it would move the efficiency range of the turbo down a tad.

think of it like installing a smaller profile camshaft, just makes different power at different revs.

that's my $0.02...

discopotato03 Grand Master

discopotato03

Posted
Posted (edited)

It wouldn't work because the inducer diameter of the 82mm GT40 56T compressor wheel is larger than the 76.2mm GT37 56T wheel . From memory the GT40's inducer is ~ 61mm where the GT37's is ~ 57mm . The compressor housing on a real GT3076R is port shrouded and the radial surge slot is positioned to match the height of the GT37 wheels lower or splitter blades . It wouldn't be right for the GT40 wheel and I'm not sure if there is enough material in the inner shroud to take a GT40 compressor .

The early XR6 turbos used a 0.50 A/R plain snouted T04E compressor housing and I can't see why you couldn't fit the plain snouted 0.60 A/R version of that housing if it was profile machined to suit the compressor wheel .

To me it sounded like Ford only wanted to run low boost on the early XR6's and having a GT3582R with the largest turbine housing and the small ratio T04E comp housing would have given them low hot side pressure and reasonable gas speed on the cold side with low boost pressure .

It really shouldn't be too hard to get good torque out of a twin cam 24v 4L turbo engine but as usual you can't choke it up on the hot side if you want a reasonable rev range - and reliability .

Personally I think a GT35 based turbo is a bit marginal on a four litre engine and a T04Z or GT4088R would have been better , trouble is they don't have a "T3" mounting flange or an integral waste gate .

Garrett do make a port shrouded version of the 0.70 A/R T04S compressor housing , the generic GT3582R usually gets the plain snouted bell mouthed version of it .

http://www.turbobygarrett.com/turbobygarre...R_714568_10.htm

A .

Edited by discopotato03

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

    • The Bogan
      NC MX5

      By The Bogan · Posted

      Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • Dose Pipe Sutututu
      new 1.5 LSD issues/concerns

      By Dose Pipe Sutututu · Posted

      This everytime 
    • DraftySquash
      Looking for someone with a R34 front bar

      By DraftySquash · Posted

      hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • MBS206
      new 1.5 LSD issues/concerns

      By MBS206 · Posted

      Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • MBS206
      Most women will agree that parking is the most taxing part of driving

      By MBS206 · Posted

      You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...