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-   -   What spec is my GC8? (http://www.subaru-impreza.org/forum/showthread.php?t=37654)

alexlcm 03 Sep 2007 06:10 AM

What spec is my GC8?
 
Hello guys,

Need your help here. I have uploaded the photos of the console, engine bay and C.differential.

Could anyone please tell me what spec is mine ? UK spec? JDM? and most importantly what is the stock BHP? Applied model is GC8EK8D, engine EJ20GNW6ND, tranny TY752VN5BA.


http://www.subaru-impreza.org/bbs/im...ba2fae16a7.jpg

http://www.subaru-impreza.org/bbs/im...ba33919065.jpg

http://www.subaru-impreza.org/bbs/im...ba3a5d4436.jpg

http://www.subaru-impreza.org/bbs/im...ba3ed2d37c.jpg


By the way, can someone tell me how the C.Differential works and how to use it? I have no idea at all. How do i know that it is still functionable?


p/s : tidgy, please refer to the images....

Thank you.

Please help.......

2002pete 03 Sep 2007 06:45 AM

Hi,

GC8EK8D = MY97 4 door UK Turbo.

Max output. PS@ rpm 211@5600

Max torque. Nm@ rpm 290@4000

alexlcm 03 Sep 2007 07:01 AM

Pete,

What about the C.Differential?

2002pete 03 Sep 2007 07:46 AM

Info from NASIOC.

Quote:

What types of differentials come stock?

Viscous: Used as the center and rear differentials in the WRX/RS. Varies power applied between two axles via fluid dynamics and discs. This type of unit is filled with a silicone based fluid that becomes thicker as the difference in input shaft and output shaft speed increases, thereby increasing the viscosity of the fluid and the grip between the input and output discs, which do not actually touch each other.

Suretrac: Only available on the 2004 STi. Manufactured by AP Racing, this unit comes stock in the front differential of the 2004 STi. It is a mechanical type differential that employs a set of specially shaped teeth to intelligently transfer power, unlike the bevel gears that are used in conventional LSDs. Very similar in operation to the torsen type, though through different mechanical means.

Open differential: Used as the front differential in the WRX/RS. In a nutshell, it’s one wheel drive. The wheel with the least amount of traction will have majority (if not all) of the vehicle’s power applied to it.

DCCD: Short for Driver Controlled Center Differential. Used on the STi. Planetary center differential in conjunction with an electronically managed continuously variable transfer clutch. And as the name suggests, it allows the driver to control the torque bias of the center diff by a turn of the thumbwheel.

alexlcm 03 Sep 2007 08:46 AM

so does it mean that mine shown on the 1st picture is a DCCD? If yes, my dashboard does not has any indication or symbol to shows the setting. How do I know whether it is functioning or not?

Please advise.

Thanks again.

p/s: i am new to 4WD and turbo....

2002pete 03 Sep 2007 10:59 AM

Quote:

Originally Posted by alexlcm (Post 257552)
so does it mean that mine shown on the 1st picture is a DCCD? If yes, my dashboard does not has any indication or symbol to shows the setting. How do I know whether it is functioning or not?

Please advise.

Thanks again.

p/s: i am new to 4WD and turbo....

No UK classic turbo had adjustable centre differential (P1?) the JDM Sti 3/4/6 Type R had adjustable centre differential.

alexlcm 03 Sep 2007 11:23 AM

Quote:

Originally Posted by 2002pete (Post 257570)
No UK classic turbo had adjustable centre differential (P1?) the JDM Sti 3/4/6 Type R had adjustable centre differential.

huh??? then what is this??? is it a fake one ??

http://www.subaru-impreza.org/bbs/im...bee793c019.jpg


sigh ... this car made me so confused....

please help me to clarify ....

thank you.

alexlcm 04 Sep 2007 11:05 PM

ah guys... my mechanics checked for me already ... it is a fake C.diff.. just for show... really wonder why the previous owner love to spend time & money doing nothing useful ..... lol

by the way, my mechanics told me that the timing belt need replacement .. the mileage is now 89,000km. he quoted me with all the bearings and oil seals. Are they necessary to be changed at the same time? Can i just changed my timing belt because i didnt hear any noise coming from the bearing.

please advise.... my car is still stuck in the workshop ...

alexlcm 10 Sep 2007 11:54 AM

got the belts changed.... thanks guys...

2002pete 10 Sep 2007 12:54 PM

Quote:

Originally Posted by alexlcm (Post 258099)
got the belts changed.... thanks guys...

:cool:


Well worth doing If you don't have a service history with your car. (peace of mind)

alexlcm 15 Sep 2007 01:13 PM

hahaha .. it has been almost a month.. got the HKS air filter, HKS Hi-Power muffler, TEIN Type HA fully adjustable .... Greddy Profec B Spec II.. replaced the timing belt system, fuel filter... was hoping for a good drive

BUT .....

there were jerks while boosting up to 0.8 bar when i floored it... maybe the fuel pump or the ignition system is out ... sigh....

Tidgy 17 Sep 2007 09:33 PM

after all that pmsl, o well at least mystery solved lol

alexlcm 18 Sep 2007 11:25 AM

not solved yet john.. still wondering what is the cause of the jerk during boosting ....

Tidgy 18 Sep 2007 11:27 AM

ahh, was more the mystery of what car it was i was refering to lol

alexlcm 20 Sep 2007 12:27 PM

yeah !!! finally troubleshoot what was the problem with the boost jerkings... changed to walbro fuel pump .. definitely pump more than 3.0 litres per min .. but it still didnt solved the problem..

then the mechanic swap my ignition coil cables with the NGK Power cable ... took it for a sprint... whow ... 0.9 bar ... steady .. ;)

however... now i realised it wasnt fast enough ... lol... yeah .. i know .. my bad

alexlcm 20 Sep 2007 12:32 PM

by the way.. after i pumped full tank.. i only managed to get around 270 km (combination of urban and cruise driving)... asked the mechanic to check on the air fuel ratio using dynojet wide band ...

the results was around 13.0-13.5 during idle (occasionally 14.5) then during 0.9 bar -> 11 .

any idea mates ?? anyone suffering from the same fuel consumption like mine? or is it normal for MY97 GC8 uk spec?

Tidgy 20 Sep 2007 04:05 PM

um i get 13mpg, so about 140 miles per 50 litres if i realy give in thrash for a tank lol


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