I've asked Barbz about this Freddan72

He usually removes about 2kg of the flywheel weight. I think the original weight of the flywheel is 9kg.





Update: it seems I am going for the GT3071R with 0.86 A/R turbine housing.. I think this is going to put me in the 400hp club with my setup

450bhp more like.

I hope so paddy...

looks like its coming along nicely Hani!!

cant wait to see some clips of it on the you tube!

Thanks Marco.. it's getting closer and closer

Will post some clips of the car on YouTube.. some race videos as well

Okay. The original one weigh 9.4 kg. So yours is now 7.4 kg. I hope you feel a difference when it's time for a testdrive

Do you know how much the clutch weigh?

hey hani

seems that GT3071R with 0.86 A/R turbine is the way to go, but just keep in mind that there is a difference between the actual kick and the max boost.

i dont believe that you will face huge lad with the cams and the lightened flywheel. go a head a do it,,,,

hang on mate, about to be ready, so close

@ Freddan72: I hope to feel the difference. I think the engine rev will be more smooth.

As for the clutch weight:
Standard: (will check once the ePER is working again)
Helix Paddle (which I will have on my car): around 7kg with the coverplate

@ Omran: I have until end of month to decide on the turbo so will do more read and research until then

However, from what I read, the GT3071 with 0.86 A/R turbine housing will give 1bar at 3,500rpm and full boost (1.5-1.7 bar) by 4,200rpm.. I think I can live with this.. we'll see how it goes..

I have the C&B cams, head work, lightened flywheel and the 3" SIP.. all to reduce lag




Another question now.. are the 440cc injectors going to be enough with the GT3071R or shall I upgrade these as well??? I'll have the Walbro 255lph as well

hani your project is growing like nothing!!

I think the original clutch kit weigh 6.3 kg.
GTA weigh 4.9 kg. So just by changing clutch kit you save 1.4 kg

Ok.. after reading more and more on the GT3071R turbo, it seems to have two major issues: compressor surge and overboosting sometimes

Users of GT3071R, please comment

Are you going for the internally or externally gated version?

If I am going for the GT3071R, it will the internally gated version, with 0.86 A/R turbine housing.

You definately shouldn't get any surge, boost creep may happen if tyring to run very low boost. As said in our pm, I also think you should go for the 0.64 housing.

Thanks Leighton

My idea was to get the 0.86 housing in order not to regret loosing top end power, keeping in mind that spool between the 0.64 & 0.86 housings is only 300-400RPM.

Forgive my question, can you describe boost creep feeling? and what is low boost, 1.2bar for expample???

The spool between the housings is 500rpm, you will make 1bar around 3700-3800rpm and full boost around 4200-4300rpm. As long as you can live with that then go for it, it will certainly make the job of getting 400bhp easier.

Re boost creep, it is simply where the boost keeps rising despite the wastegate being fully open i.e. it is too small to vent enough exhaust. This is not a problem at moderate to high boost, but you may find at low boost i.e. 1bar, it will rise to 1.2bar by redline regardless.

sorry to jump in this thread but what would the difference (rpm wise) be between a 48ar and 63ar???
Less than 500 rpm i'd guess??

Nick

The only thing I don't like about the internally gated version is that it doesn't actually use the gt30 exhaust turbine - to get the room required for the gate it actually uses a smaller turbine

I did a fair amount of research into it, a guy "discopotato03" who seems to know a fair bit about turbos wrote a good post on honda-tech and posts alot on Skyline websites, and he seems to know his stuff - most of the way down page 2 (just look for discopotato03 post) about the gt3071r, gt3076R and gt3082R - the WG gt3071R use a ground down turbine at 56.6mm rather than the 60mm of the gt30, which he doesn't rate.

http://www.honda-tech.com/showthread.php?t=1545133&page=2

Thanks Flea and Saint

Will decide by end of month when the turbo purchase time comes..




Users of GT3071R are still welcome to comment

I got my wastegate ported on the GT3071R to try and eliminate any boost creep! Not yet up and running so can't comment further I'm afraid!

Thanks eldinho

Let me know when run it on the car.

By the way, which waste actuator are you going to use? I gues it is this one: GT28RS Wastegate Actuator



Anyway, to avoid the boost creep, solution is to use high boost all the time

Hi Hani,

Yes, I recommend you 0.86 housing .

I can see 1 bar boost with 5th gear already on 3300 rpm and full adjusted boost just before 4000 rpm.


-Jari-

Jari you are most definately the exception to this rule!! I have driven a lot of coupes now and I can't for the life of me find one that comes on that quick with a 0.86 housing. Do you have your latest graph to hand as that will give Hani an idea of torque figures across the rpm range?

Thanks Jari

As I said earlier, your spool figures seem to be the best among the GT3071R users. It must be the Finnish air as everybody said earlier

As Flea suggested, if you can post your latest graph it will be appreciated.

Okay, here you have .

Latest RR form one year ago:
http://s128.photobucket.com/albums/p199/GT3071R-WG/?action=view&current=410bhp.jpg

And the reason for sudden power drop:
http://s128.photobucket.com/albums/p199/GT3071R-WG/?action=view&current=IMGP2282.jpg
and
http://s128.photobucket.com/albums/p199/GT3071R-WG/?action=view&current=IMGP2289.jpg

Rev limiter is in 7300 rpm, what could have been seen there...

-Jari-

Jari any graph of torque or boost?

Thanks Jari

Did you have the C&B cams installed during this RR?

Nice power curve you got between 4,000 and 6,000 RPM

Hi,

Freddan, torque curve is seen on the print. I suppose you mean A/F and boost . They have been taken on video together with Apexi AVC-R rpm. Through that I can see the mixture and boost in every rpm I like.
The peak power was achieved with 1.32 bar.

Hani, C&B cams were installed half a year before this RR session.
I told you, that I can recommend the bigger housing... .
And the truth of boost behaviour on street is an other story.. .

-Jari-

Yes AFR & boost. Sorry, it's Friday

Ok.. finally made up my mind.

I'm going for the GT2871R rather than the GT3071R at this stage. I'm afraid if I get the GT3071R it will be too laggy and I feel it is a big jump right now. However, the GT3071R might be an option in the future, I try the GT2871R first and I hope to see full boost before 4,000RPM

I'll be getting the turbo from "ATP Turbo" in a couple of weeks but wanted to make sure of the associated bit and pieces to get with the turbo.

I have the following list:

GT2871R Turbo - 56 Wheel Trim - 0.86A/R Turbine Housing - 5-Bolt Turbine Discharge

Oil Drain Flange

Oil Return Gasket

Oil Drain Fitting

Banjo Fitting Kit for Coolant Lines

T25/GT25 Turbo Exhaust Side Inlet Gasket

5-Bolt Turbine Discharge Gasket

I appreciate if anyone can confirm if the list is correct and advise if I need to add any other parts . It is hard to order parts overseas everyday so I want my list to be correct so I can order everything at once.

I will get these from "ATP Turbo" as well

HKS V2.0 SSQV Blow off Valve

Aluminum Adapter (size: 1") for Blow off Valve

APEXi AVCR Boost Controller



Ohhh.. and yes, I'm waiting Barbz to call me anytime (this week or next week) to collect my engine from him