AB's new GQ is finally here

[nissannewby]

Is there such a thing as too low?

Yes. You want to maintain temperature for turbine drive. Andys wastegate needs some adjustment as it is opening to early thus loosing drive on the turbine and a subsequent boost drop. Also the tune is very lean. We dont drive very often if at all like a dyno is performed. So basically to low a temperature means you are losing response and efficiency. You want a safe max EGT. You can cruise at 350 degress with no issue even 400 degrees but you want the temps to remain stable. Andys setup has awesome potential to get this near spot on and it will be even better to drive even at his current torque/ power levels.

[Ben-e-boy]

Dont worry about it. Mine was about that when I came down for the knockwood trip.

[nissannewby]

Dont worry about it. Mine was about that when I came down for the knockwood trip.

250 Degress is his max temp even under load. The 197kw and 900nm run is very very good. You can see with the latest one his boost dropping from around 2500 this is also subsequently the same time the afrs lean out to like 22:1.

[Ben-e-boy]

250 Degress is his max temp even under load. The 197kw and 900nm run is very very good. You can see with the latest one his boost dropping from around 2500 this is also subsequently the same time the afrs lean out to like 22:1.

I haven't seen the latest sheet yet. I was just commenting on hill climb temps

[mudski]

Yes. You want to maintain temperature for turbine drive. Andys wastegate needs some adjustment as it is opening to early thus loosing drive on the turbine and a subsequent boost drop. Also the tune is very lean. We dont drive very often if at all like a dyno is performed. So basically to low a temperature means you are losing response and efficiency. You want a safe max EGT. You can cruise at 350 degress with no issue even 400 degrees but you want the temps to remain stable. Andys setup has awesome potential to get this near spot on and it will be even better to drive even at his current torque/ power levels.

This bit is very interesting Mat. I have always thought quietly in the back of my head about this. But I don't really have the knowledge to back it up....The boost on my Patrol drops off quick quickly, and there pretty much nothing after this. I was told by many it was because of the restricting intake. This is all changed, and the boost drops off just the same. Wish there was someone down here that looks into stuff this more. I feel like a dickhead when I go to a workshop and try to explain this and they just look at me with a blank face then chuck it on the dyno and just play with the pump.
I might have to take a week off and go for a drive north. Lol.

[nissannewby]

This bit is very interesting Mat. I have always thought quietly in the back of my head about this. But I don't really have the knowledge to back it up....The boost on my Patrol drops off quick quickly, and there pretty much nothing after this. I was told by many it was because of the restricting intake. This is all changed, and the boost drops off just the same. Wish there was someone down here that looks into stuff this more. I feel like a dickhead when I go to a workshop and try to explain this and they just look at me with a blank face then chuck it on the dyno and just play with the pump.
I might have to take a week off and go for a drive north. Lol.

There are a few factors that can do what you describe. It is most evident of a fuel pump setup. Most run of the mill pumps dont do much in the favour of supply and timing beyond 3200rpm. I could nearly guarantee this is about when your power levels and boost start tapering off. The other part is wastegate and its actuation. For best results you really need to run an electronic boost controller, turbosmart do some very nice ones. An electronic boost controller will see your boost hang on longer and be much more stable with the gate also setup correctly. With a electronic boost controller the pump will more than likely be the hold up. Once the pump is sorted then things like intake manifold and other mods will need to be done to maintain torque with a really nice torque rise.

[mudski]

Legend! Are those electronic boost controllers something that need to be fitted and tuned by a shop?

[nissannewby]

Legend! Are those electronic boost controllers something that need to be fitted and tuned by a shop?

No. They are very easy to wire up and setup. The turbosmart ones come with very good literature. Turbosmart gear is very high quality which is reflected in the prices. Be aware this will let you know if your current actuator is correctly sized.

I will also add to my comments above about fuels pumps. When I said fuel pump setup this is how they are setup on the bench. You will be lucky to tune it out.

[BigRAWesty]

This bit is very interesting Mat. I have always thought quietly in the back of my head about this. But I don't really have the knowledge to back it up....The boost on my Patrol drops off quick quickly, and there pretty much nothing after this. I was told by many it was because of the restricting intake. This is all changed, and the boost drops off just the same. Wish there was someone down here that looks into stuff this more. I feel like a dickhead when I go to a workshop and try to explain this and they just look at me with a blank face then chuck it on the dyno and just play with the pump.
I might have to take a week off and go for a drive north. Lol.

There are a few factors that can do what you describe. It is most evident of a fuel pump setup. Most run of the mill pumps dont do much in the favour of supply and timing beyond 3200rpm. I could nearly guarantee this is about when your power levels and boost start tapering off. The other part is wastegate and its actuation. For best results you really need to run an electronic boost controller, turbosmart do some very nice ones. An electronic boost controller will see your boost hang on longer and be much more stable with the gate also setup correctly. With a electronic boost controller the pump will more than likely be the hold up. Once the pump is sorted then things like intake manifold and other mods will need to be done to maintain torque with a really nice torque rise.

Out of curiosity with this, does a VNT setup eliminate this reduction seeing the veins are constantly adjust to max boost v air flow?

[mudski]

No. They are very easy to wire up and setup. The turbosmart ones come with very good literature. Turbosmart gear is very high quality which is reflected in the prices. Be aware this will let you know if your current actuator is correctly sized.

I will also add to my comments above about fuels pumps. When I said fuel pump setup this is how they are setup on the bench. You will be lucky to tune it out.

Yeah I have been looking on the Turbosmart website. I see they do High Pressure wastegates too. More stuff!