ko4 race turbo and vxr k04 turbo - Astra Sport and Astra Owners Club - Mk1 | Mk2 | Mk3 | Mk4 | Mk5 | Mk6 | Astra Van | 888 | VXR

coupe turbo · 15-06-2007, 20:56

hı guys, What is thecdifferences between k04race turbo and vxr turbo. If ı have k04race turbo in my z20let do I need to change my pistons or not. And what ll the boost grade with ko4 race model and at high revs...

aberdeenGSI · 15-06-2007, 20:59

You will need to uprate ur pistons and rods mate

.The boost will range from 25 to 27 psi over boost and hold around 19.5 at top end

coupe turbo · 15-06-2007, 21:06

DO U have any idea about pistons' and rods's price. And 19.5 psi in which rpm?

aberdeenGSI · 15-06-2007, 21:26

Price of rods and pistons is £1000 mate.the boost peaks at 19.5 psi at 5500rpm

Jonesy · 15-06-2007, 21:29

wouldnt you need oil spray bars fitting too? or anything else, or simply the rods and pistons?

Steve · 15-06-2007, 23:23

The turbo can only give what the mapping allows it to, plenty of people have run the stage 4 "race" turbo on stage 3 mapping, with cam work. It gives more headroom at higher revs to maintain the boost and stock pistons will cope. For a stage 4 map or beyond, then the heat can cause problems in the combustion chamber. Low compression pistons stop this, this is all I have done to my car, along with ARP bolts to keep the bottom end together. Billet rods aren't strictly necessary, depends on if you want the ultimate sort of power or not, if you plan to run a Garett turbo or IHI turbo then they might find the limit of the stock forged ones.

15-06-2007, 20:56	#1
coupe turbo AS Regular Join Date: Jan 2007 Location: TURKEY-Adana Posts: 326	ko4 race turbo and vxr k04 turbo hı guys, What is thecdifferences between k04race turbo and vxr turbo. If ı have k04race turbo in my z20let do I need to change my pistons or not. And what ll the boost grade with ko4 race model and at high revs...

15-06-2007, 20:59	#2
aberdeenGSI AS Regular Join Date: Dec 2004 Location: aberdeen Posts: 141	You will need to uprate ur pistons and rods mate .The boost will range from 25 to 27 psi over boost and hold around 19.5 at top end Last edited by aberdeenGSI; 15-06-2007 at 21:02.

15-06-2007, 21:29	#5
Jonesy AS Fanatic Join Date: Feb 2005 Location: Staffordshire Posts: 4,594	wouldnt you need oil spray bars fitting too? or anything else, or simply the rods and pistons? __________________ Regal Phase 3.5,VXR Turbo,VXR AFM,VXR Injectors,Courtenay FMIC,Dbilias Flowmaster,Regal Precat,Miltek exhaust,Lightened Flywheel,Uprated Clutch,Denso Plugs,Veccy Pipe,Eibachs,308mm Discs

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15-06-2007, 21:06	#3
coupe turbo AS Regular Join Date: Jan 2007 Location: TURKEY-Adana Posts: 326	DO U have any idea about pistons' and rods's price. And 19.5 psi in which rpm?

15-06-2007, 21:26	#4
aberdeenGSI AS Regular Join Date: Dec 2004 Location: aberdeen Posts: 141	Price of rods and pistons is £1000 mate.the boost peaks at 19.5 psi at 5500rpm

15-06-2007, 23:23	#6
Steve AS Obsessed Join Date: May 2003 Location: UK,North Wales Drives : Vectra OPC Drives : Astra SRi Turbo Drives: www.zlet.co.uk Posts: 5,094	The turbo can only give what the mapping allows it to, plenty of people have run the stage 4 "race" turbo on stage 3 mapping, with cam work. It gives more headroom at higher revs to maintain the boost and stock pistons will cope. For a stage 4 map or beyond, then the heat can cause problems in the combustion chamber. Low compression pistons stop this, this is all I have done to my car, along with ARP bolts to keep the bottom end together. Billet rods aren't strictly necessary, depends on if you want the ultimate sort of power or not, if you plan to run a Garett turbo or IHI turbo then they might find the limit of the stock forged ones.

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