ASM68

I have a 2003 Civic Type R EP3 (K20A) with a Garrett GT3076R with exhaust housing A/R 0.82.
I’m going to switch to the new Garrett GTX3076R with a new manifold for divided turbine housing.
I was not able to find the turbine flow map for divided housing for GT30R / GTX30R. I know that the divided housings available for this turbo are T3 0.78, T3 1.06 and T4 1.06 and it seems they are not made by Garrett. How do they flow respect the single entry turbine housing A/R 0.82?

TheShodan

iTrader: (14)

laggy. even on the general version. They are not "twin scroll", they are an equal divided housing. The T3 .78A/R is pretty mediocre compared to a .63A/R, but still much more responsive than a .82A/R T3. As for the T4 1.06, you'll hate that more than ever.

LightningTeg

Are there any concrete tests of the new mid frame GTX turbos yet?

ASM68

...ok, thanks!

Given a power target of 500+ WHP on pump gas (motor is built, CR =10:1, big intercooler, etc.), which options should I have to consider regarding a twin scroll or a divided housing turbo?

hybrdthry911

how did my 1.06 divided t4 gt35r spool up faster than my old t3 .82 gt30r?

Axix24

i just stick with your 30r.. Gains will be minimal and not worth your while..

hybrdthry911

have you seen any testing on the new gtx turbos to validate this statement?

TheShodan

iTrader: (14)

If you've got a boost threshold/rpm graph between the two (and not just some dyno chart), I'm sure the real answer will present itself. Gotta see something of valid measure for any of use to make any comment on that statement.

hybrdthry911

dont have any data logs of the car unfortunately, i dont have it anymore. just going by what i saw on both the dyno and of course the street. if it was soooo laggy wouldnt this be evident on the dyno which you refuse to accept as data.

do you have any data to back up your statements?

TheShodan

iTrader: (14)

Statement? I asked if you had a boost threshold/rpm graph.. Nothing more . Don't start a fight.. just relax. No one is trying to step on any precious internet egos here. My goodness

hybrdthry911

start a fight? you told me my statement couldnt be validated without any data, im just telling him what i saw when using the 1.06. given that your statement seems to contradict the results i saw on my car, im just asking for the data to support your statement that is all.

SAXON

they seem to be a pretty popular thing in the evo world

1.06 t3 housing that spools like a .63 and has the power of a .82

LightningTeg

Why does he have to? You the one who made the claim that your GT35 spooled faster.

hybrdthry911

huh? he's the one that claimed it spooled slower before i commented...

so let me get this straight, he made the statement the 1.06 is laggy and that the OP would hate it without any supporting evidence. then i make the statement that mine spools up as fast as my old 30r with my divided 1.06 gt35r and i have to provide data to support my statement but he doesnt?

LightningTeg

His evidence is his experience designing turbos

hybrdthry911

how dare i ask him to back up his statement, he designs turbos!

forgetting my professional experience with turbochargers, my evidence was obviously using the turbocharger with a divided 1.06 a/r exhaust housing. understandably he asked me to provide that evidence in a more tangible format. i explained i didnt have any of the data, but asked if he had some data to support his statement. i dont see the problem this is a 2 way street.

back on topic to the OP, i saw excellent results with my 1.06 divided housing. my gt35r spooled up faster than many other gt35r's i saw on similar setups and faster than my old .82 a/r gt35r, and with a proper manifold setup i would expect you to see similar results. if you want to see some dyno graphs PM me id be glad to shed some light on what i saw on my car.

ASM68

I have had very good results with GT35R T4 1.06 divided housing, on a K20A. Spool and transient response were similar or better than a GT30R 0.82 open housing. My results: 2000 rpm – map 1.05 bar, 3000 rpm – map 1.25 bar, 3500 rpm – map 1.55 bar, 4000 rpm – map 1.78 bar (stock cams, CR 10:1, VTEC 3400 rpm).

A GT35R is a turbo capable of 600+ HP, but with pump gas it is not safe to go over 500+ HP. Since I want to use my car only with pump gas, my idea was to use a smaller turbo than a GT35R in order to improve spool and transient response, so I was thinking the new Garrett GTX30R + my equal length divided manifold.
For that turbo, now ATP sells T3 divided housings with A/R 0.78, 0.82, 1.06 and T4 1.06, but it seems that divided T3 housings don’t flow very well and limit the top end on high rev motors like K20A Honda, while T4 1.06 is may be too big for a 60mm Garrett turbo and I could lose some advantages of a divided housing (spool and transient response).

Are there other turbos in the range of 500-600 HP with better options for exhaust housing? I was looking also at BW turbos, but for pressure ratios of 2.0 – 2.5 they seem to be less efficient than Garrett.

hondaapi

I´m in the same boat....

I also try to improve our spoolup and transient response and was thinking about a T3 1.06AR divided housing on a GTX3071R with a proper manifold on a B18C (instead of our former T3 0.63 3071R)

I asked many people and nobody could give me a real answer or could back up his suggestions.

Some people say "bad spoolup" some people "say great improvements"... :-)

I googled alot and only things that I could find was that some prople in the Evo world had good results with switching to divided T3 1.06

So I decided to try it out, design new downpipe and manifold configuartions and I will do some real back to back test on one and the same engine on our circuit track car in the next months.

2k.civic.si

yes...if we just went by what people said with no supporting data that would be plain stupid. you made a statement your 1.06 spools up as fast as your 30r now prove it.

riceball777

i also have expearance with the gt35 in t4 twin scroll 1.06ar

i have a gt35 with the t4 divided 1.06 ar with the divided full race manifold on my evo. This set up make more power and spools faster than my old gt3076r with the open t3 .82ar housing.

20psi in 3rd gear by 4k rpm on that stock evo engine

TheShodan

iTrader: (14)

I'm just saying that from the boost pressure /rpm curves that we calculated, I found that the divided housing did significantly worse for recovery of the same boost pressure going from gear to gear. Now, Honestly, some of it is from emphirical data while the rest is from the experience that I had, but that's not to say that people feel it differently by their driving patterns or what the car is used for. Drag racing, some feel as though that it "spooled" faster, but that depended upon the gearing used, or if they were in a higher gear longer. Was it a freak event? could be to someone. In a lot of circuit racing with the GT35R, I found that the divided housing couldn't regain recovery fast enough in a number of gears consistantly, and even lost almost .4 seconds lap time on many tracks because of it.

I understand that not everyone on the street drives like they are drag racing or in a circuit, but people do corelate them together. Especially for engines that were under 2.4 litres, the T3 open .82 and .63a/r showed (and felt) significantly more crisp and distinct in regaining target boost faster than the divided housing. But that's just me.

hondaapi

Well Shodan, you helped me in a lot of question in the last two years.

I´ll try the divided T3 1.06 and compare it on the same engine where we currently run a T3 0.63 and will provide you with all datas if you want.

I hope you are wrong :-) But currently it seems to be the only and last way to find a few RPM in sooner spoolup and better transient response.

If it is disappointing I can still go back to our old and prooven 0.63 :-)

LightningTeg

Isnt the whole point of a divided housing to be used with a manifold designed with it in mind? If you are going from a non divided manifold and open housing to a divided housing how is that going to benefit?

LS AzZkIkr

If you do get a divided housing and do not have a divided manifold I would HIGHLY recommend porting/sharpening the divider in the housing. I did this when I took my setup apart and there was a big difference in the way the car responded! Before I had to brake boost to get it to spool when moving. Now I can just downshift and punch it and power is there!

wookiemaddness

I know this is an older thread but can anyone else share experience on a t4 housing with a gt35r or 3076r both manifold and housing twin scroll.