Dyno Day Adjustments

[jasonsansfleece]

I have the opertunity to attend a dyno day next Saturday.
Three pulls for $80.
So the question is, what adjustments to make between pulls?

The set up;
1.6td from an Eco jetta.
K14 turbo.
Giles pump.
FMIC.
2 1/2" down pipe, the rest 3"
Manifolds matched to head and ports tidied up.
K&N air filter.

Given the limitations of time and workshop I see;
1, Max fuel screw
2, Static timing
3, Internal pump pressure (advance)
4, Spring and shim advance piston
5, Wastegate, presently closed


Max fuel, I can push 1500*F with gray smoke as it is
Static timing is at .95
Given that its a Giles pump you might assume that 3 and 4 are optimal, but maybe not. Pump also has 19,000 miles on it.
The turbo is pushing 22lbs until 3750 rpm then starting to tail off. This is probably not efficient.

Being able to read into the dyno results might also help.
Any sugestions?



 

[rabbid79]

I agree, you probably shouldn't mess with 3 and 4.  I would also make sure not to mess with too much stuff between pulls.  Since it sounds like you've already got as much boost as you're going to get, I would only mess with the static timing and the fuel screw.  How much time do you have between pulls?  You don't want to do them right in a row because of heat soak in your intercooler.

[nathan_b]

1500f and 22 psi on a k14 is asking for a meltdown.

Seriously, man, eco k14s are even smaller, 15psi WASTEGATED is the max, the turbo is so restrictive it is holding you back at upper rpms.

I run 18psi on my k14, but I can't push the egts much past 1000, it's the egts that cause fatigue, and 1500 is high.

[RabbitJockey]

yeah way too much boost for a k14, and too much  exhaust temps too, you're gonna kill the turbo.  k14's don't flow that much, so you're not going to make that much power, but you should atleast be able to do 100-130 i would think

[jasonsansfleece]

I appreciate your concerns for my poor old turbo.
Style and environment means it rarely see's such pressure for more than two or three seconds, but it has been that way for three years and 19,000 miles.

Anyway, the subject matter was about adjustments between pulls on dyno day.
Do you think there might be power gains in limiting boost to 18 lbs?

[nathan_b]

Yes, you will gain power by lowering boost. is your wastegate able to be functional?

[jasonsansfleece]

The waste gate was rebuilt, valve lapped, 19,000 miles ago but adjusted shut ever since.
I'll try adjusting it today.

[Thezorn]

Yes, you will gain power by lowering boost. is your wastegate able to be functional?

Very true, espescially with a k14. I couldnt beleive the difference form trying to push 20+ psi out of the little guy to controlling it down to 15-17, defiantley waaay more efficent.

[jasonsansfleece]

Ok, Adjusted the wastegate, now reading 19 lbs.
Turned the max fuel screw down 1/4 turn but need to go further as i can still (just) touch 1500*

I will jump the radiator thermostat switch so the fan draws air through the IC radiator.

Three pulls in succession does not give much opportunity for experimentation.

[rabbid79]

Three pulls in succession does not give much opportunity for experimentation.

How much time do they give you between pulls?  Obviously, if it's not at least 5-10 minutes, there isn't much point to having 3 pulls.

[RadoTD]

1. Run it how it's set up right now at 19psi

2. Run it how it was before with 1/2 turn more fuel and a closed wastegate.

2.5. See which makes more power

3. If 19psi > 22psi, turn it to 16psi and see what that does

[Thezorn]

1. Run it how it's set up right now at 19psi

2. Run it how it was before with 1/2 turn more fuel and a closed wastegate.

2.5. See which makes more power

3. If 19psi > 22psi, turn it to 16psi and see what that does

Thats a good idea!!

[jasonsansfleece]

1. Run it how it's set up right now at 19psi

2. Run it how it was before with 1/2 turn more fuel and a closed wastegate.

2.5. See which makes more power

3. If 19psi > 22psi, turn it to 16psi and see what that does

Yes, that is a good idea. I had planed on 1 and 2 but had not thought of 3.
I could set the wastegate to 16lbs and figure out the fuel screw setting, then I will have presets in place for quick adjustments.

I think they give you 5-10 minutes in between pulls. I wish I could have all day on the machine!

[mystery3]

Three pulls isn't enough dyno time to do any adjustment, basically just enough pulls to get a baseline number on your motor. I'd want to do three pulls after any adjustments you make as well.