Ko3 on 1.6

[R.O.R-2.0]

surging is usually a barking fluttering noise, and its usually happens with too big of a turbo,  i dunno what noise ur turbo was making it was probably just some funky over spun noise haha.  i drove a tdi beetle with a burnt up vnt turbo and it sounded like a g60

oh yes.. turbo bark.. ive done that a few times.. its hard to make it bark.

[gldgti]

i used to get the merc spec t3 on my old mk3 aaz to surge, changing up gears when at full boost and laying into the pedal again, at more than 20 psi but low rpm (like 2000).

I had a 02a ASD gearbox (very long ratios) and it wasnt the best combination for legal highways speeds, but 4th gear was great and illegal speeds were easily within reach.

a K03 sized turbo on the 1.9 is great at highways speeds for overtaking, thats what I had before the t3. On a smaller capacity engine it would be a little better I reckon, especially in a smaller car like a mk1.

[nathan_b]

i used to get the merc spec t3 on my old mk3 aaz to surge, changing up gears when at full boost and laying into the pedal again, at more than 20 psi but low rpm (like 2000).

I had a 02a ASD gearbox (very long ratios) and it wasnt the best combination for legal highways speeds, but 4th gear was great and illegal speeds were easily within reach.

a K03 sized turbo on the 1.9 is great at highways speeds for overtaking, thats what I had before the t3. On a smaller capacity engine it would be a little better I reckon, especially in a smaller car like a mk1.

because you are at max boost while cruising... haha

[gldgti]

because you are at max boost while cruising... haha

ahh yes - if you can get a double acting wastegate actuator and rig up a vacuum solenoid to open the wastegate at low throttle settings (like the aaz in the mk3 runs standard) then you dont have to cruise around with 12psi of boost.

[8v-of-fury]

Really what's so wrong with cruising at max boost? The turbo is still in its efficiency, and not to mention instant power. I see no downside

[nathan_b]

Really what's so wrong with cruising at max boost? The turbo is still in its efficiency, and not to mention instant power. I see no downside

I agree, I saw a highway mpg drop when I went from a k14-6psi cruising, to a k24-3psi cruising. And with the k24 I had to drop to 4th to do major passing, while k14 would pull hard in 5th at 60mph.

[8v-of-fury]

So basically I see the k03 being able to pull hard from like 50 in 5th up to max rpm on a 1.6. It did on my 1.9.. The 1.6 should have better use of it at higher rpms I would think. Also I would think cruising at higher boost to be better because things are still burning more efficiently.

No downside to a k03 on a 1.6

[vanbcguy]

So basically I see the k03 being able to pull hard from like 50 in 5th up to max rpm on a 1.6. It did on my 1.9.. The 1.6 should have better use of it at higher rpms I would think. Also I would think cruising at higher boost to be better because things are still burning more efficiently.

No downside to a k03 on a 1.6

PROVIDED you plan to be at 18PSI or less...

[8v-of-fury]

A sustained intercooled psi of 15 with spikes to 18-20 will be within the range of the k03's ability and not decrease its life expectancy. It hauls ass on a tdi with only 12psi.. 15 and more fuel should be a rocket.

[gldgti]

there is a downside to cruising around at 12psi - its extra heat loading on the engine and extra blowby that you don't need. You'll likely see increased oil consumption.

[R.O.R-2.0]

yea, cruising at high boost is bad..

it takes heat to make boost. and it takes fuel to make heat.

it takes me alot of pedal to be making 12 psi boost. my car only makes 3-4 psi cruising with the VNT..

12 psi boost and im accelerating, not cruising.

[8v-of-fury]

Not with a k03. Your not making high boost because your dumping a *** ton of fuel in to the motor, your making high boost because a k03 is literally the size of your one hand in a fist. It is not the fact that you are moving hot air, just air to begin with.

High boost is not bad on a small turbo, it is uber efficient. If it were bad how did my tdi make it to 430,000kms constantly cruising at full boost? And make 50+ mpg while doing so?? 

[nathan_b]

Not with a k03. Your not making high boost because your dumping a *** ton of fuel in to the motor, your making high boost because a k03 is literally the size of your one hand in a fist. It is not the fact that you are moving hot air, just air to begin with.

High boost is not bad on a small turbo, it is uber efficient. If it were bad how did my tdi make it to 430,000kms constantly cruising at full boost? And make 50+ mpg while doing so?? 

Yeah, you can't compare with a vnt, because you aint got no wastegate. Cruising on the highway, with the load of speed, the energy is there. turn it into boost and become more efficient, or dump it out the tailpipe.

My truck got much better mpgs with a small turbo and higher boost on the highway, than it did with a larger turbo and less boost. Nothing else changed on the motor, so, there is no way my motor became more efficient and got worse mpg. Put a t3 on a mk3 ahu/1z and tell me it is more efficient. ..

it's not

[8v-of-fury]

To get the same efficiency out of a T3 you'd have to be burning alot more fuel to make the "hot" air to spool it. Don't forget that a k03 is at full boost of 12-13psi at 1900rpm, cruising at 2500 easy on the pedal probably has the motor at the same area boost wise.

A properly working VNT on the TDI it came on has the motor at higher boost levels than you think. They switched to the VNT so that the motor could have higher boost literally anytime it wanted it.

[gldgti]

Not with a k03. Your not making high boost because your dumping a *** ton of fuel in to the motor, your making high boost because a k03 is literally the size of your one hand in a fist. It is not the fact that you are moving hot air, just air to begin with.

High boost is not bad on a small turbo, it is uber efficient. If it were bad how did my tdi make it to 430,000kms constantly cruising at full boost? And make 50+ mpg while doing so?? 

Yeah, you can't compare with a vnt, because you aint got no wastegate. Cruising on the highway, with the load of speed, the energy is there. turn it into boost and become more efficient, or dump it out the tailpipe.

My truck got much better mpgs with a small turbo and higher boost on the highway, than it did with a larger turbo and less boost. Nothing else changed on the motor, so, there is no way my motor became more efficient and got worse mpg. Put a t3 on a mk3 ahu/1z and tell me it is more efficient. ..

it's not

actually, I got better fuel economy out of my aaz mk3 with a t3 than I did with the stock t2 (which is same size as the k03). not the vw 1.6 spec t3 though, the merc spec t3 which has a much larger compressor.

I'm taking an average over ~40,000km (12 months driivng) of 5.7l/100km for the stock turbo and 5.4l/100km for the T3.