Julian
Hi guys,
I have the turbo out of my 1996 850R and am gonna be buying a new turbo to throw in (originally planned just to change to the 70mm turbine housing as a future proofing thing for my new exhaust, but half a weekend up to my elbows in my engine bay has made me reassess doing this all again in the future).
I have been looking at kinugawa 19T turbo, since these seem to be a popular upgrade. I see that they offer both billet and cast compressor wheels, and I assume the billet is lighter for better turbo response etc. And slightly more expensive. Given that people say the 19T can experience boost spikes, is an even more responsive turbo what I want? Or is the slightly less responsive cast wheel a good idea for reducing this?
I'd most probably be doing an ecu tune later which may overcome this anyway but it's be good to hear people's thoughts.
Julian
Some pics of the removed turbo and comparison of the original housing and new
Philia_Bear
Rob
my 19t with billet wheel
Julian
Hey Rob, I see you have an ipd turbo. Did you go with their clipped wheel "spool control" or whatever they call it, or just a standard 19T? I figure I'll probably get the billet wheel but thought I'd see what people's pick between the two was
Ex850R
Are you giving me the 70mm exhaust housing then?
Rob
Julian;105917 wroteHey Rob, I see you have an ipd turbo. Did you go with their clipped wheel "spool control" or whatever they call it, or just a standard 19T? I figure I'll probably get the billet wheel but thought I'd see what people's pick between the two was
Mine is an RSI turbo with an ARD 19T 'spool control' wheel. The CBV blockoff plate is IPD.
Julian
Oh ok, how do you find it @Rob ? I am keen to go 19T but have been hesitant up until now because of the boost spiking etc.
Some people say it's a serious problem with the standard 19T, others say that with the larger housing, freer flowing exhaust, use of high octane fuel etc that it isn't really a big issue.
@Ex850R , I reckon this housing was an alright deal for $200 or whatever I paid for it, so if you've got yours apart some time I think it could be a good investment. The casting and finishing looked really good to me, with nice thick flanges etc. Treat yourself!
Just back to the original question also, is billet always the best choice if you can afford the bit extra cash, or is there any reason someone would want the cast wheel version?
Vee_Que
Billet is more about blade design. They can make them a longer tip which will increase flow. The issues with spool is not as big a deal as long as you use bugger injectors with it.
deleted_user_160
I'll do my best to find the billet v's cast thread from a while back.
Though in a nutshell, one does not offer performance gains over the other in flow if they are of then same spec. Where the billet do offer gains is in the heat cycling. Full boost, no boost, full boost, no boost. In short periods of time. The billet wheels handle the constant cycling better than the cast. It a why you see them on a large portion of real truck/bus turbo.
The other pro of the billet wheels is small production and prototype runs you can do.
Frontline the design of the wheel? Make a small change on the next one. And so on.
The other thing you should consider, which is severely overlooked. Turbine wheels.
Inconel wheels are far superior in handling the extreme heat.
And again unless your on the gas 24/7 it's not really of much use.
deleted_user_160
Oh and dont forget you can anodise billet wheels all kinds of pretty colors.
Here's the thread.
https://www.enginebasics.com/Advanced%20Engine%20Tuning/Billet%20vs%20Cast%20Wheels.html
Julian
Ok thanks for the info guys. I suppose for the little bit extra cash I might as well go with one of the billet wheels. Before reading about turbos i didn't even think they'd really cast something as thin as a turbine blade.
Sorry if it's hijacking a cast vs billet thread, but just with that boost spiking of the 19t that some people report, is there any reason not to go an 18T instead? Like, unless i plan to go nuts in the future with running big boost, would the 18T do anything I'd want it to without this boost spike issue?
Just bought some second hand green injectors too, so they'll be going in!
deleted_user_160
Probably where your going to notice the biggest gains other than wank factor. (Which is entirely a good reason to go ahead and do something)
The choice of your blades.
The amount of single blade design and the combination of the X+x wheels make a huge difference in how the boost will come on and perform for your desired application
Vee_Que
Stick with the 19t, especially with the bigger rear housing. I don't see boost spiking as am issue with a good intercooler and a tune though.
Julian
Yeah in the near future I'll be getting a tune (actually i might put up a wanted ad for the m4.4 ecu now whilst i think of it) but not currently planning to do an intercooler upgrade for a while. I guess as long as the car can be driven without risk of having a hand grenade go off in my engine bay before i get the tune sorted it's ok.
Philia_Bear
I near alwaus go with a billet 19t as the cost of having the turbo rebuilt is the same for me if using a stock 16t wheel or using a billet 19t wheel
Julian
Ok, I am probably going to get a whole new kinugawa rather than rebuild my current one and put a new wheel into it, as I wouldn't mind having new wastegate actuator and cbv whilst I'm in there, and would otherwise have to get the whole thing rebalanced.
deleted_user_160
Philia_Bear;106022 wroteI near alwaus go with a billet 19t as the cost of having the turbo rebuilt is the same for me if using a stock 16t wheel or using a billet 19t wheel
Though the OP was cast vs billet
Philia_Bear
Julian;106027 wroteOk, I am probably going to get a whole new kinugawa rather than rebuild my current one and put a new wheel into it, as I wouldn't mind having new wastegate actuator and cbv whilst I'm in there, and would otherwise have to get the whole thing rebalanced.
The cost being the same for getting a new kinagawa one vs rebuilt with a kts wheel and kinagawa housing and mitsubishi bearings
Id go down the path of rebuilt any day of the week
deleted_user_160
I would like tackle the kinugawa unit my self.
Keep your existing unit, as spare or sell off get some money back and spend it on an intercooler or tune. That your holding off on.