Good info, thank you. I read up on the BBK full and BBK B. I'm really sold on this 1.0, but it sounds like I might need to go with the 2.0 due to back pressure issues I may have at the race track, while running higher boost.
I am a little bummed because I think I would like the response of the ball bearing 1.0. but, on the bright side it sounds like the 2.0 ball bearing will still be plenty responsive.

 

The 1.0 and 2.0 use the same turbine, you will have more backpressure with the 2.0 since the bigger compressor will be shoving more air through the motor..

 

That's what I thought too, but I actually didn't see an appreciable increase in backpressure going from Full to 3B. In fact on an equal power basis, the 3B had lower backpressure. Made me conclude that there's more of a bottleneck on the compressor side than turbine side.

 

If this is true, I'd 100% go 1.0 But everything I've read tells me the 1.0 has more back pressure at high boost than the 2.0. By hi boost, I'm meaning 30 psi or more .
Bleh. Every thread I read contradicts the others LOL

 

Kaj

Nobody can drive at 30psi on track...NOBODY...
NEMO Evo cannot on EFR8374 or 9180, nor can anybody else outside Drag Racing community.

For track limit yourself to 22-23psi...LIMIT has to be hard limit, on 91.
Even on 100 I would not go over 25psi.

Frankly, I see no point in stressing over 100octane on track, dual maps, etc..when its minimal gain.
I'd stick to 91 and buy it cheap at trackside, sticking to 22-23psi.
Lower boost, less backpressure, lower EGT with lots of timing advance, and results in happy motor delivering long reliable performance.

I'd do HKS turbo over all others...but to each his own.
I do not have any data to analyze nor anything to present: I owned 2, own still 1, and Love them to bits. BBK-Full/Blouch 1.0 will not spool respond like HKS..its just the way it is.
Top end is same.
That low end response is key for dual purpose car that is awesome on street and amazing on mountain roads.

 

I run e85 for Time Attack events. Maybe it's not worth it, but my times were much faster, so it would be hard to let that go.
I keep one eye out for the HKS turbo.... But never see them for sale anymore.
When I do HPDE , are usually run pump gas at about 25 psi. As for daily driving, it sees the occasional cruise around town maybe a couple times per month.
Hmmmmm....
Sounds like I should just pick up the 1.0 XTR and do what I can with it.

 

The HKS 7460 has been found to be fragile and high EGT's will destroy them. So probably not the best track day choice. By all accounts a great street turbo though. http://www.lancerregister.com/showthread.php?t=434486

 

I had 2 original HKS turbos, pre Kai...94AWDcoupe as well as well as many more.

HIGH EGT will kill any turbo.
Its misuse, not failure by design feature.
They are made, HKS turbos to run up to 2 bar- not 2.5 bar or 3 bar... and on Pump Fuel.
When you run so much boost, you have to retard timing- which leads to super high EGT, plus the backpressure...
its all wrong tuning...and thus failure is imminent- of any stock frame turbo this way, or even Full Frame if run at similarly wrong regimes..

Do you know that EFR also fails at high boost?
Yes it does! Nobody is saying they are bad- its just that over-spun they fail..so different reason than HKS...but still result is same.

There are surely a few who had them fail, here and there: again, old story- FP turbos, Blouch/CBRD, how many failed..and are still failing? Let's not even go there.
Just ask Zhong how many BBK's he's replaced on his TA Evo here in Cali?

HKS at 25psi will not go out.....Mine has lots and lots of miles on it.

Again, each to his own- this is Blouch Thread..should hot mention other brands, but I did..since Kaj is semi local in Fresno and I wish him best.
As he said...get Blouch 1.0 and be happy.

FYI 94AWDcoupe has HKS for sale.

 

edit nevermind. extra post.

 

alpinaturbo clearly you are happy with your HKS as it meets your needs. But plenty of other people had problems with theirs. The threads are not hard to find. Plus from my understanding HKS is no treat to try and deal with should you have warranty issues.

Its true no turbo is indestructible, but some are certainly more resilient than others.

 

Nemsin
As long term Evo owner I read all HKS threads ever posted: let's say total of <10 threads posted in total between EvoM and MLR, about HKS failure.

In contrast, many tuning-service shops/companies chose and choose today to NOT sell FP/CBRD products due to failure rate and perhaps now past, not present, awful service/warranty support by both.

So in pure numbers- no comparison on failure rate experienced by FP/CBRD >vs HKS failure rate...
To the point that even today FP has chronic oil consumption.

But given that I had BBK-B and HKS, without having time nor inclination to do a controlled study on reliability as reliability engineer could,
I will say that all 3 today being Ball Bearing turbos are same reliability wise, with exception of FP chronic oil leakage.

So I am not citing superiority of HKS today reliability wise, nor inferiority at the same conditions- if you want to see recent failure of BBK-b at 28psi in 3 laps of TA, just ask Zhong how many did he replace for that same reason?
3-4laps....not 45minutes ...

I'll stop here,
I am impartial to any particular make
Only partial to best driving performance


Kaj
Bbk-b or Blouch 2.0 on 2.0 & 91 octane are too big - slow spool for track recing:
Just ask BlackenedWings.

 

Just got home from a track day with NASA AZ. The 2.0L and FP 71HTA is a badass little setup. Ran 25psi during TT and 30psi for the two lap time attack series we do. Car is a blast. 71HTA spools fast and makes power all the way to 7200rpm.

 

Was it decently competitive? I'm ordering Monday, so have to make up mind soon.

 

I was keeping up with a couple C6 Z06's and a Gen 2 Viper on the main straight if that helps I really like this turbo. Spools fast and makes power to redline.

 

Nice! My local track is Buttonwillow. From what I can tell I need either 400whp or 350whp + r-comps to dip, decently, below 2:00. I'm nearly stock weight with OEM aero, so need all the help I can get LOL.
I just need a turbo that can survive 3-4 laps at that power level. I'm still on my 6spd as well, so I need to take that in to consideration.
I'm thinking 1.0 and do what I can with it. I can make up the rest with weight reduction and aero. I'm not looking to kill the new motor.