More Fuel, More Boost, No more power?

[Ruan]

I'm running with an 11mm'd Governor modded pump with a K14 Turbo, however, I can set the pump so there's no smoke on boost and I produce about 1.8bar (26psi) peak, however, I can give it more fuel yet it blows coal heavilly, yet I produce 2.0+bar (29psi+) - it goes off the end of my gauge, yet there feels to be NO more oomph, obviously this is Arse-Dyno readings, obviously not amazingly accurate, but I can usually tell increases in power fairly well...

Is this purely down to the fact that the Turbo is too small?! Too little head flow? Injection length (STILL!?) too long? Need more Advance to get the fuel burning early enough!?

Cheers for any advice!

[745 turbogreasel]

Engine?
EGT?
Intercooler?

Once your turbo is outside its operating range, it will mostly produce heat.

[MJF]

Way too much boost for tiny turbo, time to go bigger. 11mm pumps are good to 200++hp, K14 from 1,6TD good up to ~130 max...

[Ruan]

So basically the general consensus is bigger turbo...

I just really don't know where to go next, I really can't be arsed with stupendous lag...

From what people on here have found, does VNT prevent lag enough to warrant all the added complexity, or is it just easier to ling on a T3 or similar?

[theman53]

I bet you would have more uummphh at 18 psi than what you do in the 20s. Try it with the same fuel and see if the egt is too high. adjust accordingly.

[vanbcguy]

My K24 has some lag but I wouldn't call it stupendous.  By about 2K RPM it's spooled up pretty good.  It's certainly fine to drive around in the city - I usually don't beat anyone in the first 60 feet if they're actively trying, but as soon as I hit second gear buh-bye...

[rabbid79]

I can give it more fuel yet it blows coal heavilly

That statement right there pretty much says it all.  If you're "blowing coal", you're not getting enough O2, and thus, not making any more power.  The amount of oxygen in the intake charge is not proportional to boost when you're operating that far outside the ideal capabilities of the turbo.  No question you (and the environment) would benefit from a larger turbo.

[Smokey Eddy]

I can give it more fuel yet it blows coal heavilly

That statement right there pretty much says it all.  If you're "blowing coal", you're not getting enough O2, and thus, not making any more power.  The amount of oxygen in the intake charge is not proportional to boost when you're operating that far outside the ideal capabilities of the turbo.  No question you (and the environment) would benefit from a larger turbo.

and an inter cooler.
i added what i would consider a very large (volume) inter cooler and i was running a T3 on a 1.6 bottom end 1.9 head and if i wanted, the gauge never read below 10psi across shifts.
Bigger turbo's = longer spool time but you're really not going to care because it only matters when the car isn't moving and you have to get going. ie. Drag racing.

so that being said. go for a bigger turbo you wont even notice the "lag"

[RabbitJockey]

My K24 has some lag but I wouldn't call it stupendous.  By about 2K RPM it's spooled up pretty good.  It's certainly fine to drive around in the city - I usually don't beat anyone in the first 60 feet if they're actively trying, but as soon as I hit second gear buh-bye...

yeah i always thought the k24 and t3 were a good turbo, maybe not for the stock form of these engines, but for a slight increase in power they're awesome.  and i never worried about lag much on any turbo,  i drive an na rabbit and it goes with traffic just fine, so if i have a turbo that is a bit laggy but gives me insane power, so be it, i can already stay with traffic so whats it matter.

[Smokey Eddy]

My T3 was perfect for my application.
12-18 psi right in its efficiency range.