I screwed the boost up to a little over 18psi. Goes well temps dropped but running 17psi at 100kmh and seems to be using more fuel. Would a needle valve drop the boost when cruising at 100? Also at that high boost I am now getting boost spikes when I didn't before hand
Cheers
Brad
2005 GU IV 3L ST-S Mods: 3in Zorst, chipped, Autron egt, boost and dual voltage gauges, pillar pod, dual battery, IPF round spoties, Nissan alloy Bullbar.
I take it your egt reading is in Celsius? If so thats right on the top end. Even way too past for my liking.Originally Posted by Badball
Using a needle valve will enable you to control spool up and therefore reduce your boost spikes and you can also set the mid range or 100kph boost levels. The dawes is only there to serve as a boost limiter and nothing else. The needle valve is used for the performance side and fine tuning. Giving you total control, not just half for you and half for the ECU.
I'd run without the chip, tune it up and see what your egts are like. Then put the chip in and compare it. It could be just the chip causing the high egts.
I run in 25psi max and 18psi at 100ks. When fully loaded and towing my 1.4t camper my egts never go over 400c. It will usually sits around the low 300s. I get to a hill and I put the foot down it will usually go to around 380c. Give or take.
Last edited by mudski; 26th March 2015 at 05:26 PM.
Badball (26th March 2015)
Thanks for the info Mudski, I will order the needle valve off you and fit it and have a play when I get back home from work in a couple of weeks.
What fuel economy do you get running higher boost pressures?
2005 GU IV 3L ST-S Mods: 3in Zorst, chipped, Autron egt, boost and dual voltage gauges, pillar pod, dual battery, IPF round spoties, Nissan alloy Bullbar.
Fuel what? Don't know mateI drive mine like I stole it half the time. So I assume it wouldn't be great. Lol. Thats something I have never bothered with.
Lol normally I'm the same but running across the Tanami I don't wish to run out of fuel out there 😳 so I need to be a little careful.
2005 GU IV 3L ST-S Mods: 3in Zorst, chipped, Autron egt, boost and dual voltage gauges, pillar pod, dual battery, IPF round spoties, Nissan alloy Bullbar.
mudski (27th March 2015)
The only time i did take notice was we travelled fully loaded with a 1.4T camper in tow. We got from Melbourne to Eden, southern NSW coast, just accross the border, on 75ltrs. According to Whereis, its 569k's. Thats the only time I took notice.
Depending on how you drive and what the terrain I would think 14-15 lt/100ks would be ballpark
CRD are a tad thirstier but not by much
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
That's around 13l/100km, that's awsome pulling a camper Mudski. Best I get is 12/100 with the roof rack on.
Yer I was thinking around the 16/100 mark with my van in tow. I was getting that a while back but just not sure about that if I run the boost levels higher to keep the EGT down
Last edited by Badball; 27th March 2015 at 02:00 PM.
2005 GU IV 3L ST-S Mods: 3in Zorst, chipped, Autron egt, boost and dual voltage gauges, pillar pod, dual battery, IPF round spoties, Nissan alloy Bullbar.
I was using a blend of Castrol 2T oil in the fuel too back then. I reckon this may have helped the usage a little.
I think I've had too much of a blend tonight lol 😜 living the dream👍
2005 GU IV 3L ST-S Mods: 3in Zorst, chipped, Autron egt, boost and dual voltage gauges, pillar pod, dual battery, IPF round spoties, Nissan alloy Bullbar.
mudski (28th March 2015)
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