Jump to content
SAU Community

Recommended Posts

Guest INASNT

I need some help on how to read the comp flow map for this T04 60-1 Trim i might be buying.

to4-60-1.JPG

It has 0.60 A/R comp and either 0.84 or 0.63 A/R exhaust housing.

How Good will this run on a internally stock RB25DET with adj cam gears. Dont worry about injectors and fuel pump etc coz they r getting done 2.

Link to comment
https://www.sau.com.au/forums/topic/18063-reading-comp-flow-maps/
Share on other sites

Hi INASNT, very quickly .........

At 1.1 bar of boost, it is going to be doing 96,400 shaft rpm and producing 55 lbs of air per minute. I can't tell you the efficiency as it has no calibrations on the islands, but it looks to be around 65% to 70 %, which is good. That's enough air for around 550 bhp.

It has good efficient airflow of 25 lbs per minute using 69,600 rpm at 0.5 bar. Efficiency drops off sharply over 105,500 rpm and using more than 1.5 bar of boost would be waste of time. It is going to need careful tuning and matching of the exhaust turbine and housing to stay above the surge limit.

In summary, a pretty good compressor to use with an RB25DET provided it has at least forged pistons and preferably forged rods as well.

Hope that helps

INASNT - compressor maps arent too difficult to read - airflow along the bottom and bar up the side. thing to remeber is that at sea level you already have 1 bar - so subtract 1.0 from the vertical axis and you will have boost pressure.

With turbine housing size, one theory (the one I am trying:)) is to use a smaller housing with large wastegate - this will build the boost earlier, and keep you away from the surge limit. I am using a 0.61 A/R ratio turbine housing on the 3037 I am fitting - I hope it will be done and tuned in about 2-3 weeks (the wait is killing me) so I will let you know how it goes.

That turbo should be sweet with 0.8 to 1.0 bar on stock internals (and a good tune) - after that start thinking about a head gasket to drop the compression ratio

***ducks for cover waiting for sydneykid to throw something***

Guest INASNT

More info on the turbo.

Exhaust housing has a T03 flange, although A/R .84 housing is to suit an external wastegate. The A/R .63 housing is internally gated which is also available if required.

It is a bush-bearing Garrett T03 turbo which actually has a 360 degree competition (screwed-down) thrust bearing also (forgot to mention).

But it is a design from the 70's and a twin ball bearing would be more efficient and spool up quicker wouldnt it??

damn i dont know what to do!!!

If the bearing was from the 70s, I would definately replace it with a new one before fitting it:p But seriously, bush bearings today are catching up with ball bearings. Subaru use them on the WRX.

If you are not sure - go with what you really want, not what is cheapest - remeber, the glow of a cheaper unit will wear off quickly - the added cost of a better unit will be forgotten when you are driving. I would definately go the smaller A/R ratio as it will make boost quicker, just make sure the internal gate is a good size, which it should be if its designed for use with that turbo. If you are buying it from a shop, ask if they have fitted them to anybody elses car, and if you can get in contact with them to find out how it went?

sidewaymambo - any details on joe's turbo, performance wise and what turbine AR did he use? - that map is just so nice and fat!

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


  • Similar Content

  • Latest Posts

    • My goals for it atm are to get it registered, respray and some mild power gains eventually... I picked up the car from an elderly gentleman near the border of NSW and VIC, its honestly a bit rough and looks like its been driven on a farm (because there was so much dirt underneath). Last week I dropped the subframe and emptied the old fuel out + added a new fuel pump (think the old one went bad from old fuel). Now I'm onto fixing a coolant leak at the rear of the engine + adding a new radiator as the old one is corroded. After that i have a new bumper, coils (as the old were leaking) and lots more
    • Welcome buddy! Plenty on here and YouTube. What are your plans for it? Good luck with the Rwc and Rego bud!
    • Love this so much! Please post a photo when you have a bike on the trailer.  I was a little bit worried about having a tow bar on the Skyline, but having it hidden behind the number plate is genius
    • Came here to say, put all the wiring from the new motor and gearbox in that you can, then throw the stock ECUs in the bin, and get an aftermarket ECU. Should be pretty easy if you can use a multimeter and read a wiring diagram to then use a PNP aftermarket ECU to suit the motors wiring loom, and make the minimal changes you will to get it to work in with the body loom (If any). This will mean you can very easily circumvent/bypass the Park/Neutral start disable switch, and get everything running really easy!
    • If the roof is dual skinned the whole way, IE, there's a "top" metal piece, and a "bottom" metal piece, to slow it down as much as you practically can, you should be able to get an attachment for a spray can/your spray gun, where it is a long, thin flexible hose, and when you're "spraying" it is spraying it in every direction possible. The I'd get that, and feed it through the roof as much and as far as you can. It's basically like fish oiling the car, but you're soaking it in rust converter. Then do the fix like Murray has described having cleaned up the existing metal as much as you humanly can. I'd also throw as much rust converter on that exposed metal before putting the fibreglass/metal filler over everything.   As for welding a replacement in. I've owned my own MIG welder for about 10 years. I've also worked in an industry doing MIG welding for a job for about 3 months dead straight, and we were doing 11.5 hour work days 5 days a week, plus a Saturday 6 hour day. (I then moved over to running the massive CNC plasma as I could understand the technology, and work with the main guy out there). I also f**k around with my welders a bit at home. So what I'm saying here is, I've probably got more hours on a MIG gun than you'll manage to get under your sleeve doing home sorts of jobs over the next 5 years. I also have an ACDC TIG that I got myself a year or two back. I've got a short amount of experience on the TIG only. My home MIG is also presently setup for doing thin sheet metal. Unless I didn't care about how that roof looked, and I just wanted a functional metal roof, and it being out of alignment, warped, and bowed, I would NOT attempt a roof replacement UNLESS I could do it as a whole panel like Murray described where the spot welds were.  Welding has this REALLY annoying thing, where if you want something to be perfectly square, unless you can clamp that thing to damn perfection (Welding fixture table), it is NOT going to be square, so you start to learn, the type of metal you're working with, how thick it is etc, and weld in VERY specific ways, and by knowing how YOU are as a welder, so that as the welds cool, the metal work pulls itself into place. If you want to see some cool tricky shit done, Bennets Customs is an Aussie guy, and he mentions a guy a lot call "Kyle", who is from "Make It Kustom". Watch some of their welding videos, especially on sheet metal. You can use the welder to shrink the steel in, and you can also use the welder to stretch the panel out. When you have the skill level that I have, you can shrink the metal in and out... But never on purpose like those two guys do. You just manage to f**k it all up. Then I smack it around with a hammer till it sits lower than I will want it too, then I shove filler on top and then pray to deitys that I can sand it into some form of sane shape that doesn't look like a dog has taken a shit, after eating a tonne of pumice stone... I'm all for DIY, and for learning, and please, feel free to give it a go, but be aware, you need to live with the consequences of how time consuming it is to do, AND that it's going to look no where near as good as what you can make it look with just some filler now. Oh AND, even once you replace it, it's like to still rust away again eventually, because you'll have missed putting primer and paint on some part of the newly welded in sheet metal, or against part of the existing metal you couldn't get to...   Oh, and to weld all that in, you will need to pull the window out, and strip at least the roof and A Pillars of interior trim and wiring. You'll then need things like the big fire proof/weld spatter proof mats to lay down, OR you'll end up needing to strip the ENTIRE interior to avoid sending it all up in a ball of flames. If you want to see how annoying sheet metal is to weld, head to bunnings, buy there 600x600 1.6mm mild steel (Not GAL!) sheet, and cut a few pieces, and try and weld them together. Then understand, 1.6mm sheet is nearly 50 to 100% THICKER than the cars sheet metal.   The photos I posted before, I'm replacing with 1.2mm thick mild sheet, and it's very easy to blow through both the original steel (Especially if I hit an area that should have probably been cut out a bit more) or straight through the new sheet metal. And I'm doing the floor, which can be hidden easily, and doesn't matter how pretty I make it, as long as it's damn strong! I'm also doing it in a 4WD, that has seen many off road trails, and doesn't need to look that pretty ever
×
×
  • Create New...