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mitchyboy01 · Feb 10th, 2012, 09:52

Hi guys, as you know I've now got my car up and running with the Holset. I was planning on getting a piggyback ECU fitted and getting it mapped with bigger injectors. I can't afford it ATM so I decided to see what it ran like on the stock map on VXRs.

I will add that I have fitted my T4 with a fuel return line and adjustable FPR so I can fine tune the fuel pressure.

I removed the tiny 312cc injectors and fitted the VXR 470cc ones. Checked the fuel pressure was 3bar. I have read that the siemens EMS2000 can compensate for up to a 30% increase in injector size so i wasnt expecting it to run well on these 50% bigger injectors.

Anyway, I started the car and was surprised to see after a few mins it idled perfect with an AFR of 14-15. Took the car out and part throttle AFRs were spot on. Wide open throttle AFR were ok if a little rich. The car was only running 9psi boost. So I fitted my MBC and gradually tweaked the boost up.

I got to 20psi before the WOT AFRs were spot on and OMFG the car is a monster. Im sure the injectors could still do more. That's at 3 bar fuel pressure so I still have scope to raise pressure. It hits 20psi by 2700rpm. I'm leaving the boost at 20psi until I can get a proper map as I don't want to push my luck. I know this turbo can push plenty more boost. I actually accidently proved this when the hose fell off the MBC line yesterday and the car was spinning in 4th at over 100mph (on the test track obv very cold tarmac). I looked at the gauge and it was at 30psi. Doh. Lucky to get away with that one. Thank god for forged rods!!! But jeez was it quick.

I will try and get a few vids at the weekend if I can. I'm a very happy chappy ATM.

Will get a power run booked in and do some datalogging with the Torque app as I'm a bit worried about timing advance on a stock map. I also need to get an EGT gauge fitted. It may just feel fast as I'm used to low boost but it'd be nice to have at least 270 until I can afford to get it mapped properly.

Finally feel like I'm getting somewhere. Happy days.

Mitch.

Feb 10th, 2012, 09:52	#1
mitchyboy01 Premier Member Last Online: Oct 25th, 2020 06:40 Join Date: Jun 2011 Location: Dover	T4 finally turning into a beast Hi guys, as you know I've now got my car up and running with the Holset. I was planning on getting a piggyback ECU fitted and getting it mapped with bigger injectors. I can't afford it ATM so I decided to see what it ran like on the stock map on VXRs. I will add that I have fitted my T4 with a fuel return line and adjustable FPR so I can fine tune the fuel pressure. I removed the tiny 312cc injectors and fitted the VXR 470cc ones. Checked the fuel pressure was 3bar. I have read that the siemens EMS2000 can compensate for up to a 30% increase in injector size so i wasnt expecting it to run well on these 50% bigger injectors. Anyway, I started the car and was surprised to see after a few mins it idled perfect with an AFR of 14-15. Took the car out and part throttle AFRs were spot on. Wide open throttle AFR were ok if a little rich. The car was only running 9psi boost. So I fitted my MBC and gradually tweaked the boost up. I got to 20psi before the WOT AFRs were spot on and OMFG the car is a monster. Im sure the injectors could still do more. That's at 3 bar fuel pressure so I still have scope to raise pressure. It hits 20psi by 2700rpm. I'm leaving the boost at 20psi until I can get a proper map as I don't want to push my luck. I know this turbo can push plenty more boost. I actually accidently proved this when the hose fell off the MBC line yesterday and the car was spinning in 4th at over 100mph (on the test track obv very cold tarmac). I looked at the gauge and it was at 30psi. Doh. Lucky to get away with that one. Thank god for forged rods!!! But jeez was it quick. I will try and get a few vids at the weekend if I can. I'm a very happy chappy ATM. Will get a power run booked in and do some datalogging with the Torque app as I'm a bit worried about timing advance on a stock map. I also need to get an EGT gauge fitted. It may just feel fast as I'm used to low boost but it'd be nice to have at least 270 until I can afford to get it mapped properly. Finally feel like I'm getting somewhere. Happy days. Mitch.