big cc engine turbo application

[clorox]

just curious.

i see that in US, many Supra 2JZ or Skyline RB26DETT guys go for Trust/Greddy single big turbos like T-78 or T-88.i always heard that ball bearing turbo is better,and as i know the Trust T series turbos r non b.bearing(sourced from mitsubishi turbos). so why they don't go for ball bearing big single like HKS T series (Garrett sourced)?any good explaination?pros and cons on ball bearing and non ball bearing?

for big cc, 6 cylinders engines like Supra 2JZ and Skyline RB26DETT,if the goal is to get high bhp/top end power, which turbo configurations are better? twin turbos or single big turbo ? im very confused.some use twin turbos like 2JZ with twin HKS GT 3037 or twin GT2835 for big bhp.and some prefer big single turbo like HKS T-04R, T-04Z,T-51 or Trust/Greddy T-78 and T-88 to get the big bhp.

and if twin turbos configuration is chosen,and if external wastegate is required,must use to external wastegates or use only one external wastegate?

thank u.

 

[f8.]

jun japan always uses trust/greddy turbos simply because they get it for free. without offending anyone, it is generally acknowledged that reliability wise, garrett and kkk are pretty much the top names for car turbos. for response, the king is ihi especially with their ball bearings but reliability is down compared to garrett.

actually, hks is a very very big company in japan, and definitely the most cash rich in terms of all japanese tuning companies. there is a reason why they chose garrett over ihi, kkk and mitsubishi when they wanted to release their own turbos. quite frankly, there are some things hks do where they are not really restrained by budget simply because they have the backing. if you look at some of their project cars like the altezza and drag gtr's, you will see what i mean. no other japanese tuners do it the scale hks does and also, as far as i know, hks is the only tuner who has ever gone into f1 and came up with their own f1 engine. i'm not saying i agree with a lot of their tactics but simply, technically speaking, they are very good at what they do. and there is a technical reason why they stuck with garrett all along.

for inline 6's, people use single turbo if they are restrained by cost. going twin usually means more money in terms of manifold, crossover pipes, wastegates(2), load sensing, twin entry intercooler and tuning/engine management. however, the most powerful inline 6's in the world are twin turbo. the single turbo ones do get big figures, but never as much as what 2 gt3245's can do for example.

 

[clorox]

thank u f8 for your reply.

so what's the difference between ball bearing turbo and non ball bearing in making mega bhp?which one is better?to say that ball bearing is superior than non ball bearing type, in US many 2JZ owners prefer Greddy T78 and T88.i did asked many ppl about ball bearing pro...the first and only answer is fast response i.e. less lag.

am i right that Trust/Greddy turbos are non ball bearing?and Trust/greddy must have their logical reason for developing and choosing non b.bearing turbos.what do u think the reason?

 

[f8.]

yes, trust/greddy uses mitsubishi turbos and i have yet to see a ball bearing mitsubishi turbo. i don't know why though, pehaps they will release a ball bearing turbo soon. yes, the major advantage is response, but perhaps other forumers can chip in their views too on this matter. thanks! it also appears to me that generally, trust/greddy turbos are cheaper than hks turbos, perhaps this is why many people use them.

 

[clorox]

coincidently, in latest local EVO magazine,featured cars r GTR33 and GTR32.both r using Greddy massive T-88.the dyno results r impressive.the GTR33 hits 800bhp on wheels...and i think the car belongs to this zth active forum member.

i wonder how's the ride in a 800bhp car...

i dont know what's the bhp of my 4G63T at 1.7bar, but for me,it's already fast.it's must be a great rides on that GTRs.

 

[edgar_raphael]

Yea, I can't understand the concept either. Most fwd cars with tight engine compartment tends to choose ball bearing turbos because of their size. But 6 cyl with massive horsepower uses T67 T77 T88 , all big ones, they looks like they belong to trucks engine.

 

[SDF]

actually latest trends in US are inclined towards Garrett GT ball bearing turbos for Drag races...

the Massive GT 42/45 which can easily pump 1000hp alone is a favourite...the toyota guys are runninig twin GT42 !! :o