A little experiment, Ljet cold start Options

[Porschef]

After all the trials and tribulations by some of the Ljet crew and their struggles with cold starts, it came to me in an early morning haze this morning that maybe I should try bypassing the AAR valve and rigging some sort manual one. I figgered if inadequate air was creating the low idle at start situation, then maybe this would be a way of seeing that an increase in air would remedy that.

Ok, so I pulled the AAR, and set out to get what I needed. Well, here’s where a little laziness took over, I thought before I through that, may I’d see if a total bypass would work…



Here’s one of the AAR hoses going from the plenum directly to the intake boot.

So being diligent on startup as to not allow a potential crazy high idle, I gave it a shot.

Wouldn’t you know, while it was a bit balky to start, when it did the idle shot right up, and I shut it off. Knowing what to expect on the next attempt, it went up to just about 2k rpm, then crept up more. It was enough to convince me that inadequate air is getting into the engine with the stock AAR (which functions perfectly) and that a slightly larger one like VanB has installed will probably be the ticket.

Thanks to @Van B @StarBear and @Wonkipop for their quest for perfection (IMG:style_emoticons/default/beerchug.gif)

[StarBear]

Hehehe. Either military intelligence or alien technology! We’ll see what happens when one is in my car. Yes, hoping for a return to “original normal” would be just fine.
Thanks for the AAR primer @wonkipop .
Now that makes sense that the air is flowing in the other direction. With the vacuum at the air intake horn I presumed the AAR line was in vacuum, too. Still learning….. (IMG:style_emoticons/default/biggrin.gif)

[Van B]

Hehehe. Either military intelligence or alien technology! We’ll see what happens when one is in my car. Yes, hoping for a return to “original normal” would be just fine.
Thanks for the AAR primer @wonkipop .
Now that makes sense that the air is flowing in the other direction. With the vacuum at the air intake horn I presumed the AAR line was in vacuum, too. Still learning….. (IMG:style_emoticons/default/biggrin.gif)

You can’t think of vacuum as a singular state. Pressures vary both above and below atmospheric pressure. Its the pressure differential and the tendency of systems to strive for equilibrium that determine which way things flow. The manifold is higher vacuum/lower pressure than the intake boot air. So, air wants to go from the boot into the manifold as long as the AAV allows it.

The more air through the AAV, the more the AFM flap moves, with more fuel through the injectors as a result. This loop will continue until the “system” stabilizes. Thats why @Porschef saw a super high RPM when he had a straight hose connection, and why a worn AAV only provides mediocre performance.

Oh and if aliens were real, and we had their technology, then I would expect these cutting edge technologies I am supposed get into operation to be much better than the over priced same old same ole… our stealth tech is little more than funny angles and paints that manage emissivity.

[wonkipop]

… our stealth tech is little more than funny angles and paints that manage emissivity.

i need the angle measures and paint spec.

got to get under the radar so i don't cop another 51k-in a 50k zone-$200.00+ fine in the danny-dick-head-ville suburban operations theatre. i think i can figure out how to cloak the heat signature on the aav with unclassified documents.

[Van B]

… our stealth tech is little more than funny angles and paints that manage emissivity.

i need the angle measures and paint spec.

got to get under the radar so i don't cop another 51k-in a 50k zone-$200.00+ fine in the danny-dick-head-ville suburban operations theatre. i think i can figure out how to cloak the heat signature on the aav with unclassified documents.

There's no all-aspect protection. You need to assess where the cop is and then your approach angle. from there you can assess what features on your car will reflect back at the receiver. Then you have to either redirect the reflection away from the receiver or absorb the energy.

The above is a near impossible task for cars unless you want to get rid of your plates, turn signals, reflectors, windshield, and everything else that makes your car road legal... but then the cop can just pull you over for not having those things and write you several tickets instead of just one (IMG:style_emoticons/default/headbang.gif)

So the real tactic for defeat is early warning capability. you need to see his system, before the system sees you. a good radar detector with GPS memory is a fantastic threat mapping tool.

[wonkipop]

… our stealth tech is little more than funny angles and paints that manage emissivity.

i need the angle measures and paint spec.

got to get under the radar so i don't cop another 51k-in a 50k zone-$200.00+ fine in the danny-dick-head-ville suburban operations theatre. i think i can figure out how to cloak the heat signature on the aav with unclassified documents.

There's no all-aspect protection. You need to assess where the cop is and then your approach angle. from there you can assess what features on your car will reflect back at the receiver. Then you have to either redirect the reflection away from the receiver or absorb the energy.

The above is a near impossible task for cars unless you want to get rid of your plates, turn signals, reflectors, windshield, and everything else that makes your car road legal... but then the cop can just pull you over for not having those things and write you several tickets instead of just one (IMG:style_emoticons/default/headbang.gif)

So the real tactic for defeat is early warning capability. you need to see his system, before the system sees you. a good radar detector with GPS memory is a fantastic threat mapping tool.

ah well. looks like i am f$5ked then.
going divine wind.
i know where to get a red dot head band from in a tourist shop in cairns north qld.

banzai. (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beer3.gif) (IMG:style_emoticons/default/biggrin.gif)

if i'll be getting my license suspended and my car crushed for doing 35 mph in your failure to be independant imperial measurements, may as well go down in flames on the carrier deck.

(ps i just read a story that the b52s are going to be stationed in darwin and they are expanding the runways. might have to take a trip up north and watch them take off, never seen a b-52, what a plane. seen a f-117. but never a b52. things are getting interesting down here in the southern hemisphere. too old to join the airforce, but it sure is getting kind of curious and reassuring down in these parts). (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beer3.gif)
keep up the good work on the paint specs etc. at least some of us care about it.

[ClayPerrine]

(ps i just read a story that the b52s are going to be stationed in darwin and they are expanding the runways. might have to take a trip up north and watch them take off, never seen a b-52, what a plane. seen a f-117. but never a b52. things are getting interesting down here in the southern hemisphere. too old to join the airforce, but it sure is getting kind of curious and reassuring down in these parts). (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beer3.gif)
keep up the good work on the paint specs etc. at least some of us care about it.

Back in the 80s, Carswell Air Force Base in Fort Worth (Now Carswell Joint Reserve Base) was a SAC base with B-52s on alert there 24x7. When I got my pilot's license, the field was due north of Carswell. We would be up flying and an alert would come on the radio, and we would have to vacate the airspace at maximum speed either east or west. The B-52s were scrambling and headed out at max speed in 2 second intervals. It was an an awesome site watching all the BUFFs headed out like someone kicked an anthill.

FYI... and the BUFF is the nickname for the B-52. Big Ugly Fat Fellow/F**ker. It is amazing that a military airplane that had it's first flight in 1952 is still operational in 2023. I read an article online a while back about how a new B-52 pilot was assigned to the same plane his Grandfather had flown when it was new.

(IMG:style_emoticons/default/hijacked.gif)

[wonkipop]

(ps i just read a story that the b52s are going to be stationed in darwin and they are expanding the runways. might have to take a trip up north and watch them take off, never seen a b-52, what a plane. seen a f-117. but never a b52. things are getting interesting down here in the southern hemisphere. too old to join the airforce, but it sure is getting kind of curious and reassuring down in these parts). (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beer3.gif)
keep up the good work on the paint specs etc. at least some of us care about it.

Back in the 80s, Carswell Air Force Base in Fort Worth (Now Carswell Joint Reserve Base) was a SAC base with B-52s on alert there 24x7. When I got my pilot's license, the field was due north of Carswell. We would be up flying and an alert would come on the radio, and we would have to vacate the airspace at maximum speed either east or west. The B-52s were scrambling and headed out at max speed in 2 second intervals. It was an an awesome site watching all the BUFFs headed out like someone kicked an anthill.

FYI... and the BUFF is the nickname for the B-52. Big Ugly Fat Fellow/F**ker. It is amazing that a military airplane that had it's first flight in 1952 is still operational in 2023. I read an article online a while back about how a new B-52 pilot was assigned to the same plane his Grandfather had flown when it was new.

(IMG:style_emoticons/default/hijacked.gif)

i wouldn't classify that as a hijack or off topic. but not an administrator or mod. (IMG:style_emoticons/default/smile.gif)

strikes me the bee five two ( (IMG:style_emoticons/default/smile.gif) auslish) is just like a 914 (nine one four).
rebuild rebuild rebuild. keep the air frame going.
because its.............just so good?
not that i would really know, but it must be or the USAF would not bother?

classic. also the 914 was once considered ugly. (still is in some circles?).
so the car and the plane have a lot in common.

huge fan base as well?.

(IMG:style_emoticons/default/beer.gif) (IMG:style_emoticons/default/beerchug.gif)