GCG Hiflow Hybrid on R33 GTS-t

[Bass Junky]

They are much different.

They are designed to run off 1.5 litres (half the V6) so are much smaller.

Like the RB26DETT turbos are much smaller than the RB25DET turbo.

[Cubes]

Basically the new gen core is rated to flow more, the older core is rated to flow less.

If it's possible to use the new gen core with the internal gate housing i'm not sure, if it works well is another thing, you may experience surge with a small exhaust a/r?

[Bass Junky]

Bullant.

You mentioned the GCG may bring back the 500 hp turbo, but woulld have to address the size of the wastegate in order to make it commercially viable.

Did they offer to enlarge your wastegate?

I once spoke to them about highflowing my turbo and I asked if they could make it bigger, and they said no problems.

Just a thought.

Any further reflections on how the turbo performs?

Have you done the 2nd gear from walking pace test? When does she begin to boost?

BASS OUT (Still searching for a VG30DET Exhaust housing)

[Bullant47]

Sorry i dont know about a 500hp hi flow.

2nd gear boost starts at about 2200rpm and makes a lot of wheel spin at about 3700rpm.

3rd gear boost starts at about 2200rpm and makes full boost (19psi) at around 3800rpm.

It ramps up very strong and really fast in between these revs.

[Munna]

Sorry i dont know about a 500hp hi flow.

2nd gear boost starts at about 2200rpm and makes a lot of wheel spin at about 3700rpm.

3rd gear boost starts at about 2200rpm and makes full boost (19psi) at around 3800rpm.

It ramps up very strong and really fast in between these revs.

I did the same thing in my car as have a standard turbo for a comparison (mods are in sig). I did it by just idling along in the selected gear than just held it flat.

2nd gear boost starts at 1000rpm and full boost 11psi at 3000rpm.

3rd gear was exacly the same.

So to me it looks as though boost comes on 1000rpm later but spools just as quick or quicker than stock. You have got to be happy with that very impressive. I would like to see people do the same tests with 2535 standard gcg highflow ect for interests sake.

[Cubes]

Bullant.

 

You mentioned the GCG may bring back the 500 hp turbo, but woulld have to address the size of the wastegate in order to make it commercially viable.

 

 Did they offer to enlarge your wastegate?

The issue with the old GCG 500hp highflow wasn't boost creep (where boost cannot be kept down, creeps up as revs increase) the issue was with surge.

A larger exhaust a/r was needed to help shift the full spool a little higher in the rev range where the motor can consume the air better.

I'm unsure of the differences between the 500hp and 450hp highflows they offered, I assume it was the compressor size.

It looks as if the GCG Highflow on the rb25 would be very similiar to the XR6 Turbo on the Rb30. Spool wise.

[Bass Junky]

Ahhh. Fair enough.

Thanks.

[silva33]

ill be able do the 2nd gear test for you very soon with a HKS2535!!!

[Munna]

ill be able do the 2nd gear test for you very soon with a HKS2535!!!

Cool should be interesting

[Cubes]

I did it in mine today. Stock Rb20DET Turbo running stock boost.

Boost and surge under 2000rpm, as soon as 2000rpm hits it kicks and breaks in to a wheel spin at this time it looks like its wheelspinning around 2300rpm or so.

Just a pitty the power drops off rapidly after 5000rpm and peak power is made around 4400rpm. lol

[discopotato03]

Cubes yes , the GT30 housings will fit early and late cartridges as will any housing machined (profiled) to suit .

Garrett often sells cartridges without exhaust housings so the end user can select one of several to suit his/her application . If you look in the old Garrett catalogue PDF the "GT3071R" (700177-23 CHRA No) is sold as a cartridge without compressor or exhaust housings but there are three variations of both turbine and compressor housings available .

The integral gate HKS housings are the go and while expensive not as much as an aftermarket cast manifold and waste gate . GCG can get HKS housings (as I suppose HPIAB could) and if enough people were interested they could possibly market these with late "GT30R" turbochargers that will bolt up and take advantage of all the available technology .

Cheers A .

[benl1981]

cubes - you car sounds pretty good for stock turbs..do you have powerfc or other?

Or pizza cutters

[Cubes]

Its an RB30DET that's had a bit of headwork.

[Bass Junky]

Hey ppls.

I may have found a couple.

Bullant47 and Cubes

The turbos you managed to find: Were they water cooled?

The hunt may well be fruitful yet!

[Bass Junky]

any pics of the turbos before modification?

Cubes, any photos of your turbo?

[Bullant47]

Hey ppls.

I may have found a couple.

Bullant47 and Cubes

The turbos you managed to find:  Were they water cooled?

The hunt may well be fruitful yet!

Yes the VG30 I got was Water and Oil cooled.

[Bass Junky]

Got any pics?

[Bullant47]

Got any pics?

No sorry, I only had the VG30 in my possession for about 15 minuites. GCG got it and opperated on it almost immediately...It was complete with dump, 02 sensor and in good condition actually.

Hey on another note, I went back to C&V for a touch up on the tune cause along with the massive power the car is making, some knock was occasionally observed on the Power FC. It appears that the R34 fuel pump is maxed out and A/F is leaning out at high speed (around 180kph). Next week a Bosch 044 and swirl pot is being fitted to keep the A/F line straight on the graph. Con recons the turbo is so efficient that with more fuel he can make a lot more power safely. After he played with the high end fuelling and took out a little timing it actually made 273.9kw@tw. 3kw more than before. So be prepared to think about fuelling cause the GCG Hiflow with the VG30 turbine housing sees the end of the GTR fuel pump upgrade. I'll post up the dyno sheet when i hook up the scanner.

Ian

[Bass Junky]

I've got the Walbro pump which is supposedly good for over 270 rwkW.

Hopefully.

[Bullant47]

I've got the Walbro pump which is supposedly good for over 270 rwkW.

Hopefully.

Thats what i'm saying Pete, you'll be right on the limit of the fuel pump.

Ian