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-   -   AFR tuning (http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/1074545-afr-tuning.html)

spjuvern 09-12-2021 04:39 AM

Quote:

Originally Posted by Black_Hat (Post 11455350)
see post # 5 looks like some added flow from nicely
ported heads.
also a CAM listed
if the intake and exhaust flow to match the heads and CAM
you will need a modified fuel head then you still will be limited

also 1.3 bar on stock turbo ? then all that added flow with a stock turbo ? - this leaves a lot to be desired ....

you are on the slippery slope ....

Yes heads and intake is ported + cams

It is a big performance up in my butdyno fron 1bar to 1.3 with the stock turbo

Anyone dyno the stock 964 euro turbo what is the most hp you can get out if the rest of the engine is good flow?

spjuvern 09-12-2021 04:42 AM

Quote:

Originally Posted by RarlyL8 (Post 11454672)
I re-read the original post and see that the engine is stock with cams and 1.3bar boost. The stock fuel distributor and injectors should have the capacity to feed these mods. (I do not recommend anything above 1.1bar, it puts undue stress on the engine and leads to detonation). If your system pressure and fuel volume are in spec I would remove the e-WUR install the -160 WUR and see where you are. Modifying the fuel distributor will disable the Lambda function. The amount of increased flow is set to match the anticipated power level, adding too much can overshoot the range of fuel curve adjustability.

So if I modify the fuelhead I can’t use the lambda control valve with my Frankencis?

I don’t use the E wur, I have a modified oem WUR and lambda controll valve that I use the frankencis to adjust the fuel map

RarlyL8 09-13-2021 05:18 AM

What modification was done to the WUR?
Correct, fuel distributor modification eliminates Lambda. The fuel head now functions like the Euro unit.
What is the anticipated HP to the wheels with the mods you have? The extra boost may overshoot the capacity of the OE fuel system however that boost level needs to be reduced. You might first start by reducing the boost level to the point where the fuel catches up then take a look at things. Extra fuel won't cure detonation and a mixture of high boost plus lean fuel is lethal.

spjuvern 09-20-2021 02:57 AM

Quote:

Originally Posted by RarlyL8 (Post 11456107)
What modification was done to the WUR?
Correct, fuel distributor modification eliminates Lambda. The fuel head now functions like the Euro unit.
What is the anticipated HP to the wheels with the mods you have? The extra boost may overshoot the capacity of the OE fuel system however that boost level needs to be reduced. You might first start by reducing the boost level to the point where the fuel catches up then take a look at things. Extra fuel won't cure detonation and a mixture of high boost plus lean fuel is lethal.


The fuelhead i have is the euro with lambda

the WUR is modified so no coldstart pressure
warm CP 3.1 bar
boost CP 2.5 bar

i adjusting the fuel map with lambda valve + Frankencis
and it runs now very good in all rpms i would say.
and one very good thing it is taking fuel like a normal car not stupid rich in some rpm/boost like before.

i dont know HP but it is a big change in the buttdyno 1.0 vs 1.3bar in the swing
i have lower the two maps to about 0.9 at higher rpm because there is not enough fuel for keep AFR there.

spjuvern 09-20-2021 03:04 AM

Here is the log at 3e gear
Boost 1.3 bar AFR 11.8



http://forums.pelicanparts.com/uploa...1632135824.jpg

RarlyL8 09-20-2021 05:31 AM

I can't make out the chart but 11.8:1 AFR is perfect fueling at full boost redline. My target range is 11.5-12.2 AFR depending on operating environment.
The Euro -037 fuel distributor is not designed to use Lambda. Modifying the -145 USA FD mimics the -037 which eliminates Lambda.
Rule of thumb is about 20hp/0.1bar boost, so you have added about 120hp over stock, about 60hp over what is considered a safe level. You would need to run race fuel to offset detonation, and even with that there is a huge stress being placed on your engine unnecessarily. Turn down the boost to 1.0bar and add a set of performance headers such as the tuned units we offer. You'll see the same power results and the engine will actually run cooler than stock.

30KFT 10-31-2021 08:32 AM

Increasingly rich as rpm increases
 
My original early 930 motor has been fitted with a K27 & Carrera cams & a PowerHaus muffler & is otherwise stock but freshened. After having all the major components of the original CIS fuel system rebuilt by reputable vendors (pumps, lines, FD, CPR, injectors, filters, throttle body, on & on) & the distributor, CDI & engine wiring harness(es) when warm my AED AFR reads 10+/- @4K, 11+/- @3K, 12+/- @2K & jumps to 14-15 @ 1.5K. Below 1.5K rpm it won't idle & won't re-start until it cools a bit. Since I have read about everything I can find here & elsewhere but have still been wrestled to the ground by the CIS I'm hoping for some suggestions on why, as my rpm increases, the mixture richens when it should be roughly in line with all the ranges I see listed here. It seems like I am overlooking something simple. It wouldn't be the first time on this project but this is making me lose my enthusiasm. I could use a hand if any of you have ideas. Thanks & I really enjoy following y'all-

spjuvern 06-11-2023 09:14 AM

So update after sending the fuelhead to CIS flowtech.

Previous I adjusted the CP with frequency valve and Frankencis
And one modified WUR

I then had warm CP 3.1 bar
And boost CP 2.5 bar

After modifying the head for max flow
I mounted back the Frankencis EWUR
So now I have about 4 bar warm CP
And boost CP 2.0 bar

But I have less fuel than before fuelhead modification, from 5500rpm and above only more under 5500rpm maybe they did something wrong?

http://forums.pelicanparts.com/uploa...1686503617.jpg



I checked the amount of fuel on return outport from head and it gives even little more than specifications

This is 1500cc in 27 sec

http://forums.pelicanparts.com/uploa...1686493048.jpg


What more could i test?
Is my system pressure really falling more that others?
6.8 down to 6.3bar when it goes lean.

Last reflection
I see in log voltages average about 13V normal drive drops to 11.9V when it goes lean.

Any other have logfiles of their system pressure and voltage? So I know that i not troubleshooting something that is normal this car.


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