IHI Turbo Range Specs

[dasnoboarder]

Is there anywhere that has the specifications of the IHI Turbo range? VI58, VI95, VI87 etc.

Trying to find comparisons between IHI & Garrett, internal & external wastegate etc.

[Paaji]

On here mate:

www.ihi-turbo.com/products.htm

J

[dasnoboarder]

I can only find this page on that site

www.ihi-turbo.com/turbo_chart.htm

All the models listed there, I've never heard of. Arn't our turbos RHB5 VI__?

I want too see specs like the compressor wheel size and air flow rate of my VI87 compared to a VI95 and then see if there is a ball bearing turbo maybe a little larger that can bolt straight on.

[Paaji]

ahah. I'll see what I can dig up.

As far as I was aware, our model is the RHF5?

J

[Paaji]

From what I've found, VI95 is the short code for RHF5, and VI87 is RHB5.

Still searching, more to come tomorrow.

www.rbracing-rsr.com/turbo/TurboMaps/ihi_specs.gif




I found these specs for RHB5 series:

Warner-ISHI RHB5 Specs:
Air Flow Rate: 1.4 - 10.8m3/min // 49.4 - 381.4ft3/min
Max Pressure Ratio: 2.8
Maximum Speed: 180 x103rpm
Max Allowable Gas Temp: 9500C // 1742oF
Diesel Engine Application: 54-154Ps
Gasoline Engine Application: 73-208Ps

J

[dasnoboarder]

Awesome work man .

So for an upgrade from the VI87 (RHB5), going to a RHF55 or a RHF6 would be a good choice? Where can you buy them?

With an intercooler, exhaust, maybe headers (might be needed?), would there be too much lag? I don't mind a little, in comprimise for top-end power.

My long term goal is 200hp.

[Paaji]

No worries mate. Still trying to find more detailed specs like you asked (wheel size etc).

I guess you could import one (plenty available on the web from the US & A), or talk to your local turbo guys.

Good luck finding replacement headers. AFAIK, there are no OEM replacements for these donks.

200HP sounds like a lofty goal, I hope you get there. Maybe gas injection would help you there?

J

[Paaji]

Found more info on this site. Has lots of great stuff, including "Turbo Calculator Horsepower and Airflow". specs for different brand turbo's etc.

www.rbracing-rsr.com/turbotech.html

Another site:

www.gcg.com.au/Technical%20Data/technicaldata.htm

About all that I can find at the moment. From what I've read on some sites, IHI are very secretive with their specs.

Hope this helps,
J

[dasnoboarder]

I think I'll need custom made headers made up... thinking because of that, I might get an external wastegate.

Is it true you can disable the internal wastegates on a turbo, to make it exactly like a wastegateless turbo?

I'll see how far I get with air filter, headers, turbo, exhaust, intercooler, snorkel, all the usual timing advances, 14+ psi before I look into gas injection.

[Graham]

If you get custom made exhaust manifold, I don't see any reason to stick with IHI turbos. ?

You could put just about any turbo on I assume, and get away from IHI's lack of info.
I remember having a Mitsubish turbo, apparently the turbines spin the opposite direction to most other turbos, which means parts for rebuilding or customising it are pretty much non-existant.

Cheers, G

[dasnoboarder]

Have been looking more at turbos as my VI87 has started to whine.

Keeping stock headers too, lack of spare change.

I have heard that all IHI turbos can be swapped as they use the same exhaust manifold flange.

IHI VF24 and similar turbos are said to have fast spool rates and high air flow. These are also "RHF5" but are rated for 425cfm at 18psi.

Does anyone know what the difference between a "VI95 RHF5" and "VF24 RHF5" would be?

[mudgrip4]

If your turbo is on the way out it might also be idea to get good second hand replacement. Going for 200hp is an ok idea, but in practice you do not need that type of power for offroading - unless you plan to do trials. My 2.8 has 155hp and that is more than enough. You can do real well with a standard 2.8 with 110hp with the right setup - have seen it again and again with clubmates' trucks. Apart from trial tracks, its very rare in offroading that you need huge horsepower - on the other hand you always benefit from good tyres, a reasonable lift, and traction aids like a lsd or lokka. These are the things that actually count. You might get to 200hp, but it would certainly affect engine life and add almost nothing to performance on the tracks we generally do.

Just a thought from a greybearded 4wder, before you part with lots of $$$!!

Cheers Mike.

[dasnoboarder]

I am either going to go for a new VI95, as recommended.

Or look out for something like a second hand VF24/28/29 and have a look at the difference in one of those. Should bolt straight on.

I want the power to replace what will be lost with added weight of tyres, bullbar etc and more, just because I want more for on-road & motorways (I would like to be able to pass people, on all those damn annoying uphill passing lanes).

Around a year ago, I had to decide whether to build a road car (boy racer) or a 4wd. I chose the 4wd, but still have a little bit of boy racer in me.

[Jimmu]

I know how you feel. Off road the power is not needed but onroad it is nice to be able to put your foot down and overtake.

It is a but hard to compare dyno figures between dynos and even harder to compare flywheel horsepower as you are only estimating the drivetrain loss. But I _would_ like to drive a MU with 200HP at Flywheel They go well with the 100HP at the wheels that mine has.

I reckon you could get 130 at the wheels or so out of the 4JB1T with a bigger turbo and decent intercooling.

The standard turbo on mine will not push max boost past about 3000 RPM before dropping back off to 12 or so at redline. If you could get a solid 20PSI into it cool enough (Front Mount or Big Water to Air) and get the fuel pump to push enough diesel into the engine to match I reckon it would just about do it. The dyno guy that tuned mine has done a few and the biggest he had seen from a 4JB1T is 115 at the wheels (With stock turbo, On his Dyno) but that was pushing the EGT limits.

If my turbo pops I will be looking for something from a common Jap import motor such as an RB20 or RB25 to play with...

Keep us updated

Jimmy