jibe

I'm in engine break in period. But it feels smooth... except the triple clutch! It's a nightmare for the left leg. But I wanted it. Yesterday I let the engine go to 200g of boost and 4000RPM. It's really well breathing and the car feels light. I don't know how many tanks I will have to empty before I can go 1bar and 7500 RPM but It's hard to wait for it!

Finished and on the road:

Digging this old thread. I'm about to finish my build and now I'm close to first start. I made measurement of the compressor and turbine wheels and imprecise measurement/calculation of turbine A/R and what I found seems a bit crazy! Compressor wheel is effectively 82 exducer, but is 63mm inducer instead of 57!!! So that makes the compressor side a good monster though it becomes bigger than a GT3582R and closer to a T04R/Z compressor. And the second kisscool effect is on the turbine side: the wheel is effectively some Ptrim whith 74mm inducer and 63mm exducer (same as T04R/Z), but my rough measurement of A/R on the T4 housing gave me 0.40!!!!!!! Totally retarded A/R on a RB26! I think I now understand the "HKS N°40" written on it. Thinking about what it will look like when used, it should be a spooling monster but clearly a power and boost killer at high rev, with enormous backpressure and heat. Looking at the turbine entry, the T4 inlet becomes sooooo small inside regarding the amount of gas that are going to try to pass through it!!!!!! So I think I'm going to try it at 1bar to see how it behaves, but I really must find an other bigger standard RHC7 housing for a more realistic use of this turbo. Works 510, do you maybe know where I could find one?

Thanks, but I'm living in France, maybe it's not included in your mobile phone contract and would be expensive? I can wait, it's not a problem. If you still prefer I will send you my number by PM.

Thanks for the help. Good to see I'm not the only one using a RHC7. Do you have pics of your exhaust housing?

Impressive Machine. Back to my thread, is there a turbo guru here that could help finding more information about my weird hybrid turbo? Thanks!

Digging out this thread. I have been looking for weeks for information about the exhaust housing of this hybrid turbo. It looks sooooo small! And nothing is written on it. And it's still a real T04 flange! it's smaller than all T04R turbine housing I have seen and way smaller than RHC7 stock turbine housing. In one hand the spool must be sooo quick!! In the other hand there is a risk of early choke. Luckily, the exhaust wheel is damn big, 74/63mm 72trim. The only info Y have is it's stabilo written "HKS N°=40" on it. It has real T4 flange and 3" 4 bolt outlet. Have you already seen this kind of turbine housing?

Haha! Excavator Turbo...

Thanks. When looking at the numbers, particularly trim numbers, it should be a big but responsive turbo. So it should have a slightly lower top end than T04R. Anyway, it's quite enough for what I want.

Do pics help?

No one?

Has anyone heard about mounting a IHI RHC7 turbo on a RB26? I'm searching some information like RPM for boost peak at different boost levels, maximum bhp output, feedbacks from owners... I just finished rebuilding one and it just came back from balancing. I'm going to mount it on my forged bottom RB26. Mine is a bit king of hybrid because using a HKS T04R turbine housing. Here is some information found on internet: Compressor wheel inducer= 57.15mm exducer=81.91mm 57.15mm^2/81.91mm^2*100 = 49 trim Turbine wheel exducer =62.61mm, inducer =73.66 62.61mm^2 /73.66 mm^2*100 = 72 trim Compressor housing 2.27 inches of area / 3.31 radius = .69 ar T04R turbine housing is T4 inlet .81 undivided RHC7 seems to be given for 62LB/min It has very near dimensions with power enterprise PE2220, so it could probably flow 22M3/min. A bit less than 62lb/min. I have seen 1JZ dynos with that turbo at 550RWHP. If some of you used this turbo or have information, please let me know.

Yes, stock ports and stock valves. 455kw would be OK for me. Not sure the turbo can build more anyway.

Some pics before I put the engine in:

Looks like I will shift at 8000RPM (if there is still power at that rev) and set the limiter at 8200RPM Thanks everybody

Yes, GTR engine Yes, ARP bolts Yes, head cleaned, tested and new uprated bronze valve guides (can't remember brand) Must ask for balancing.

I'm about to finish my rebuild and here is the setup I will now use: r32 block. 1,1mm mhg pistons JE 87mm eagle h beam ACL RACE (calico coated) bearings cranckshaft full polished and balanced ,with longer oil pump drive collar n1 oil pump OS GIKEN TB2 twin plates clutch and flywheel stock ECU mapped by myself full stock head n1 water pump Turbo IHI RHC7 with T04R turbine housing 6 runners manifold Z32 AFMX2 800cc injectors greddy timing belt adjustable pulleys twin 255lph pumps Basically, it's a fully forged block (I'm planning for 500/600bhp) and stock head (aiming for perfect idle, perfect engine start, low consumption when cruising and good driveability when off boost). So my question is, what max RPM can I run with this setup? I suppose stock valvetrain will be the limiting factor but dont know when the limit will happend. Thanks