G C G Ball Bearing High Flow Turbos For R33gtst $1750.

[ellie]

Cheers Jazza, Everything I wanted to know but I couldn't find a review of anyone who had actually fitted one!

[Sydneykid]

Question for SK to get an Idea for the 2L boys.

Standard Rb20 with normal breathing mods - pod, intercooler, good exhaust, EBC etc.

What rpm does it start boosting?

What boost pressure have you found to be the most efficient to make power?

At that pressure, when does it hit max boost?

I understand that you probably feild questions like this all the time but I know that you run a GCG highflow on your rb20det and am very interested to hear your very knowledgable experience on the all round performance of this engine/turbo combo for a street car and what mods/tricks get the best out of this package?

Understand if you don't want to rewrite essays but any info would be most appreciated!

Keeping it as brief as I can;

Using a GCG Ball Bearing High flowed RB25DET turbo.

We used to run 1.3 bar on the old (170,00 k's) RB20DET for 225 rwkw

In 3rd gear it would make the full 1.3 bar by 3,750 rpm

(that's on the Commander and the Datalogit, the old R32GTST standard tacho read about 10% high)

It would hold the 1.3 bar all the way to 8,250 rpm (rev limiter)

Mods were a Power FC with boost control kit, POD, heat shield, ambient air feed, Jun adj cam pulleys (inlet and exhaust), Performance Metalcraft spilt dump, standard R32GTR intercooler, R32GTR fuel pump, R32GTR injectors and a light weight OS Giken twin plate clutch

Tuned for response, in particular we spent a lot of time tuning the ignition timing between 3,000 rpm and 6,000 rpm. Plus I sacrificed a little max power for more response using the adjustable camshaft pulleys.

I have compared a number of high flowed RB20DET turbos with RB25DET turbos and I can't say as I have noticed any difference in the external sizes of the compressor or turbine covers. The R34GTT turbine cover is slightly larger of course. My understanding is that the internal dimensions of the RB20DET turbine cover are slightly smaller than the RB25DET turbine cover. But that is machined to the same size when GCG do the high flow anyway.

cheers

[phatboi2010]

Hey guys,

Would I have to retune the Power FC if I get this turbo?

Is there a difference between the rb25 turbo in the series 1 & 2 R33?

I have a series 2 turbo on my RB20 so it would be a straight swap right?

[Sydneykid]

Hey guys,

1. Would I have to retune the Power FC if I get this turbo?

2. Is there a difference between the rb25 turbo in the series 1 & 2 R33?

3. I have a series 2 turbo on my RB20 so it would be a straight swap right?

Suggestions follow;

1. Yep

2. Not after it's high flowed

3.Yep

cheers

Edited August 9, 2006 by Sydneykid

[jazza08]

Nobody knows there stuff better than Gary (SK), so you can get an idea of how it runs on different cars with similar mods!

[MANWHORE]

Hey Gary

If you ever have anyone looking to high flow an r34 turbo (with the larger rear housing), but the turbo is still on their car and they want to do the swap on and off in one day, I have a blown one.

I'd be willing to let them have that highflowed in exchange for a working on. They'll get the same result anyways

[ellie]

Hey Gary. Did you have a dyno sheet you could put up for your R32 setup?

If I had the supporting mods with an ECU remap and a JayCar boost controller instead of the PFC and associated boost controller would I theoretically achieve similar results?

Cheers in advance

EDIT: did you have cams with the adj. cam pulleys?

Edited August 23, 2006 by ellie

[Sydneykid]

Hey Gary. Did you have a dyno sheet you could put up for your R32 setup?

If I had the supporting mods with an ECU remap and a JayCar boost controller instead of the PFC and associated boost controller would I theoretically achieve similar results?

Cheers in advance

EDIT: did you have cams with the adj. cam pulleys?

Sorry, I don't have a dyno sheet that I can post up for the R32GTST with the RB20DET in it.

There are limits to the ECU remapping, you might run into them before you get to the target power output. Every car is different, I can't be more specific than that.

Cams is an interesting story, I was given what I was told where standard R32GTR cams. I had no reason to check them. There wasn't any reason for me not to believe the guy that gave them to me as he had no motive to do otherwise. I stuck them in at the same time as I did the turbo and the Power FC install. Tuned it and away we went, used the old RB20 for couple of years. Then I stuck the original RB30DET into the R32GTST and gave the cams back to the guy that loaned them to me. It wasn't until I tried to copy the R32GTR cams into RB20 trick for someone else that I ran into problems, same as a few other guys have.

So I don't know whether it made the power on standard RB20 cams, RB20 aftermarket cams, standard RB26 cams or maybe even aftermarket RB26 cams. When I sold the original RB30, I stuck the RB20 back into the R32GTST with its original cams. It made within 8 rwkw of the same power, which I wasn't surprised at given its age, it was getting pretty tired at 180,000k's and after 3 years of racing.

Not a very conclusive answer I know.

cheers

[ellie]

Any info is always something to go on and most appreciated!

[jazza08]

Hey Gary. Did you have a dyno sheet you could put up for your R32 setup?

If I had the supporting mods with an ECU remap and a JayCar boost controller instead of the PFC and associated boost controller would I theoretically achieve similar results?

Cheers in advance

EDIT: did you have cams with the adj. cam pulleys?

You will find it very very difficult to get full boost (1bar or more?) on before 4k as Sk has, however 300rwhp can be achieved with standard cams and no cam gears, with these items you can bring boost on earlier (more cams..) and gain more hp obviously too! I am going to go down the cam's track abit later for some more responce but have no idea on what cams to use as i havn't look at that yet

Edited August 23, 2006 by jazza08

[r_speedfreak_r]

hey do you know if you can purchase the internals or rebuild kit from gcg and then rebuild the turbo yourself? I've pulled apart a saab turbo before and re-assembled it. wasnt really that hard

[Sydneykid]

hey do you know if you can purchase the internals or rebuild kit from gcg and then rebuild the turbo yourself? I've pulled apart a saab turbo before and re-assembled it. wasnt really that hard

My understanding is the rotating assembly, once mounted in the core, needs to be balanced on a fairly expensive (and highly accurate considering 150,000 rpm ) piece of machinery. From there on it’s a simple bolt on job for the compressor and turbine covers which have been machined to match the compressor and turbine. So not much time (money) to be saved as their is very little DIY.

cheers

[r_speedfreak_r]

ow i want one so bad but my clutch is already slipping with the power i have and my rego is due lol

[alpinestars]

who cares fork out i had to scarafice shit for this turbo still waitin on my deposit though

[r_speedfreak_r]

well worth your money alphinestar? i noticed in your signiture youv got heaps done to your car but 261rwhp isnt a whole lot? i dont understand.

[b8r]

I was wondering if this group buy is still available. I think today I blew the turbo, I was driving along gassed it then heard a loud pop followed by a big cloud of white smoke and no boost, a mate thinks it may not be the turbo but engine related. my guess is Ive over boosted. recorded 1 bar on the ebc .

[al_r33]

sk,

When are you going to be running a GB for the R34 Neo Turbo's? as i have a blown r34 turbo that i want to get highflowed instead of my r33 one!

Cheers

[Sydneykid]

sk,

When are you going to be running a GB for the R34 Neo Turbo's? as i have a blown r34 turbo that i want to get highflowed instead of my r33 one!

Cheers

Send me the R34GTT turbo and it will be done. PM sent.

Cheers

[alpinestars]

well worth your money alphinestar? i noticed in your signiture youv got heaps done to your car but 261rwhp isnt a whole lot? i dont understand.

261rwhp was with my old turbo with blown seal

ill give an update on thursday when i get the retune hope i can get 300 with stock injectors

[al_r33]

SK,

I will be ordering one of these either this week or early next week! I am just going to use my std 33 turbo instead of the r34 one!

Cheers