ALS setup

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TRN
Posts: 28
Joined: Mon Jul 29, 2013 2:39 pm
ECU Model: S100 Pro
Firmware Version: 89

ALS setup

Post by TRN »

Hi Guys,

After doing N/A engines for years, we're currently developing a turbo'd 600hp rallycross car and looking at our options regarding ALS systems. We're just beginning our research so any info or feedback is greatly appreciated.
We've got a S100 we'd like to use for the car.

My question; are there any people here that have experience with setting up the "fresh-air"/"secondary air system" type of ALS? Is this something the DTA is properly capable of doing?

Just to be sure of what we mean;
This does not use throttle blipper or throttle bypass valve, but bypasses (boosted) fresh air through a kind of egr/wastegate into the exhaust headers, igniting with some extra fuel on overrun keeping the turbo spooled.
This is a very popular type of ALS in rallycross as it's said to be a lot kinder on valves and turbine than conventional high-EGT types of ALS.

Anyone with some advice regarding component choice, do's/don'ts or control strategies?

I've found a similar topic, but since it's from 2015 I thought I'd ask for some up-to-date info.
viewtopic.php?f=5&t=930&hilit=fresh+air&start=40

thanks a lot!

regards,
Tom
Alex DTA
Posts: 1622
Joined: Fri Feb 28, 2014 1:03 pm
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79

Re: ALS setup

Post by Alex DTA »

If you know what's required, I'm sure we can make it work.
I'm interested in this set up as well.
gnutz2
Posts: 190
Joined: Tue Jul 03, 2012 2:33 am
ECU Model: S100 Pro

Re: ALS setup

Post by gnutz2 »

I started that thread you linked to but unfortunately Photobucket has messed up most furum threads on the web.

This is what I fabricated from a cheap wastegate.

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I had the als output (aux 4) triggering a mac valve which was piped into a vacuum cannister to open the wastegate and let the air into the manifold when als was triggered, I had to remember to disconnect the dump valve when testing it because the pressure would release through that valve instead.

I also added a big check valve on the wastegate inlet to stop any exhaust gasses entering the inlet tract.

Unfortunately I don't have any good advice because I never got the system working properly. I did a little testing but didn't get any hard data I could give you but I've no doubt it'll work on the dta ecu. The only advice I could think of is to install a map sensor in between the turbo compressor and the throttle plate for logging, because this is a closed throttle type of als you'll never be able to see any boost pressure made inside the inlet manifold.

This last picture is an engine I saw at autosport this year and quite obviously is the same setup as I have done.
Image
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