What Have You Done To Your Stagea Lately?

[bigkevracer]

Thats nice... Did you do that or Scotty?

What are you tuning on? I didnt think you had an emanage?

[Commsman]

Thats nice... Did you do that or Scotty?

What are you tuning on? I didnt think you had an emanage?

All mine I'm afraid. Scotty turned me up a beautiful "funnel on a flange" that was to go onto the turbo but I couldn't make it fit. I even cut his flange off and angled the funnel a little to see if I could clear everything but still no go. So I ended up making it, and all without a welder.

Oh, no E-manage, just voltage adjuster intercepting AFM signal. Have wideband meter so can DIY tune .

[bigkevracer]

Looks awesome. I want to get something similar made up, but need injectors and fuel pump first.

[plaztikman]

3 inch dump 100 cpi racing cat , no resonator , varex 3 inch in 4.5 inch out cannon , sounds great . Had the wrong dump yet the guy at Bay Rd exhaust Cheltenham Melbourne 9585 4833 redesigned it , then he welded flanges on the cat and installed the varex for only $250 .So cheap.I would go to him if your in the area .

[zei20l]

Leon thats awesome!! nice work mate

[scotty nm35]

All mine I'm afraid. Scotty turned me up a beautiful "funnel on a flange" that was to go onto the turbo but I couldn't make it fit. I even cut his flange off and angled the funnel a little to see if I could clear everything but still no go. So I ended up making it, and all without a welder.

Oh, no E-manage, just voltage adjuster intercepting AFM signal. Have wideband meter so can DIY tune .

Couldn't make it work? Shame, it took me hours to make.

The first intake I designed failed because the airflow sensor was mounted on a similar bend, I hope you don't have the same issue mate. How does it drive?

[Commsman]

Couldn't make it work? Shame, it took me hours to make.

The first intake I designed failed because the airflow sensor was mounted on a similar bend, I hope you don't have the same issue mate. How does it drive?

Yeah, it was a shame as it would have been excellent - soooo smooth. Thanks again for doing that for me.

Mine drives nice. It does need some fine tuning to get the mixtures right, but in my short 15 -20km test last night I couldn't see any issues that can't be ironed out. Maybe it's because of the smaller bypass tube below the main one?

[Sunkist]

Yeah, it was a shame as it would have been excellent - soooo smooth. Thanks again for doing that for me.

Mine drives nice. It does need some fine tuning to get the mixtures right, but in my short 15 -20km test last night I couldn't see any issues that can't be ironed out. Maybe it's because of the smaller bypass tube below the main one?

i thought the bypass tube was cause it to go in limp, as its getting un metered air? or is that being fixed with the resistor

[iamhe77]

Leon, that IS awesome.

Nice work

i thought the bypass tube was cause it to go in limp, as its getting un metered air? or is that being fixed with the resistor

I'd think it would just run leaner wouldn't it?

I mean the AFM is metering x amount of air, thus would supply the "appropriate" amount of fuel for that air volume.

If the other 25% is not measured, just means that there would be more air for the fuel map quantity.

EGT would probably be higher so that might make the ECU have a hissy fit, but can't see an issue with bypassing the AFM.

Maybe I am missing something?

[zei20l]

i would imagine youre on the money cam

i dont think the ECU measures exhaust temp, only EGO. which it would then use to trim........

[Sunkist]

Leon, that IS awesome.

Nice work

I'd think it would just run leaner wouldn't it?

I mean the AFM is metering x amount of air, thus would supply the "appropriate" amount of fuel for that air volume.

If the other 25% is not measured, just means that there would be more air for the fuel map quantity.

EGT would probably be higher so that might make the ECU have a hissy fit, but can't see an issue with bypassing the AFM.

Maybe I am missing something?

oh fair enough, im just going into comparison to having a leak in the system. which caused mine to go into a limp but only up high in the revs

your probably right though.. u usually are lol

[Dunc]

oh fair enough, im just going into comparison to having a leak in the system. which caused mine to go into a limp but only up high in the revs

your probably right though.. u usually are lol

Id have thought that it might go into limp mode also actually, if the O2 readings werent in line with what the ECU was expecting for a given AFM voltage

[Sunkist]

well my case.

i dont have a o2. i think the o2 only leans out the cruise(correct me if wrong)

i had a leak in my suction pipe as it wasnt secured properly. so it would only leak at high boost.

as soon as it leaked it was like the car hit a brick wall

[zei20l]

i had a leak in my suction pipe as it wasnt secured properly. so it would only leak at high boost.

as soon as it leaked it was like the car hit a brick wall

thats after the turbo, its air that has already been metered, so the ECU knows about it.

this is tricking the engine into not knowing about the air passing around the AFM. its like having a leak in the piping BEFORE the turbo but after the AFM. it never gets under pressure

[Sunkist]

thats after the turbo, its air that has already been metered, so the ECU knows about it.

this is tricking the engine into not knowing about the air passing around the AFM. its like having a leak in the piping BEFORE the turbo but after the AFM. it never gets under pressure

where do you think a suction pipe is out of curiosity?

[zei20l]

before the turbo, after the AFM.

did you read what i said? a pressure leak AFTER the turbo is completely differernt to one before the turbo.

a leak after it will cause the car to run rich as air is escaping; one before will cause it to run lean as there is more air in the system than it thinks is there.

[Commsman]

I'm sorry I missed all this discussion - had to work away all day .

Just to clarify, the bypass is so the AFM doesn't hit a voltage ceiling. I'm probably not telling you anything you don't know, but here is my take on it anyway, for those not sure what it's all about..

Background:

When you increase the size of the intake you get more air flow (obviously - that's what you did it for, right) & it is possible (likely) that the AFM will hit max voltage (~4.8V) before hitting full load - especially if you've done other mods. A few of you guys have experienced this already, hence the emanage. If you have a larger intake experiencing this, the ECU won't/can't increase injector pulse width (more fuel) if the AFM sits on max V.

Solution:

By sending some air around the AFM, the engine gets the extra air it needs but the AFM doesn't meter it, so the voltage is lower across the range (ie shouldn't hit voltage ceiling). The ECU reads this voltage as less load & will drive the injectors less ie run lean.

Now we use a voltage modifier (interceptor) to increase the voltage that the ECU sees from the AFM at a heap of (200+ in my case) load points by varying amounts depending on what your wideband meter is reading.

Progression:

This also allows someone to increase injector size & then recalibrate/retune. Now the good part. If you have a device that can send a "fake" EGO signal to the ECU for when in closed loop (cruise/light load), there's no reason why economy can't be retained (or bettered) even when increasing injector size with the factory ECU. My wideband meter does this!

There endeth the lesson.

Cheers, Leon.

[Sunkist]

before the turbo, after the AFM.

did you read what i said? a pressure leak AFTER the turbo is completely differernt to one before the turbo.

a leak after it will cause the car to run rich as air is escaping; one before will cause it to run lean as there is more air in the system than it thinks is there.

ok so what mine was, a leak before the turbo, after the afm.

up high in the boost it would set itself into limp after air crept through the silicone joiners..

sorry if i didnt explain properly birthday boy

[andy65b]

This also allows someone to increase injector size & then recalibrate/retune. Now the good part. If you have a device that can send a "fake" EGO signal to the ECU for when in closed loop (cruise/light load), there's no reason why economy can't be retained (or bettered) even when increasing injector size with the factory ECU. My wideband meter does this!

There endeth the lesson.

Cheers, Leon.

So what is your Wideband O2 sensor.

Cheers

Andy

[Commsman]

So what is your Wideband O2 sensor.

Cheers

Andy

http://www.14point7.com/SLC-Pure-Plus-2.php

Key Features

• 0.01[Lambda] accuracy
• Range; 0.68[Lambda] to Free Air, equivalent to 10.26[AFR] to Free Air for gasoline
• Free Air Calibration of Lambda sensor capable
• Digital display
• USB connectivity
• Multiple parameter display
• Built in RPM pickup
• Real-Time datalogging of multiple sensors @ 25 samples per second
• Internal Memory for 2.9 hours of datalog storage @ 25 samples per second
• Programmable Linear Output
• Programmable Narrowband Output

Mine is the DIY version (of course, lol) & it doesn't come with the internal memory but otherwise the same. I need to have my laptop running in the car to log, but no big deal.

I have the boost sensor as well so it can be shown on the display as well as logged along with AFR, throttle opening, AFM voltage (has 2 x 0 - 5V inputs or G sensors). Having trouble getting RPM to register but haven't played with it for a few months. Must take another look at where I'm getting the signal.