987 air intake: latest developments
 

NewArt wrote:
Thought that I might run this by you. I took the car out for a spin yesterday. It ran like crap for the first 10 minutes but then everything smoothed out. I guess that the DME was adapting during my drive. I didn't push the car at all, hardly getting above 4000 RPM. When I got back home I left the car idling and hooked up the Durametric to see what the fuel trims looked like. The results are a bit wonky but I haven't got my Anniversary Edition tune yet. In light of my recent air intake intervention, do you think that these results are to be expected or should I be looking for a leak?
FRA 1: 1.28
RKAT 1: 2.53
FRA 2: 1.29
RKAT 2: 2.67
MAF: 1.18V
9 kg/h
Let me know what you think.

The Radium King replied:
"They look pretty much as you should expect pre-tune. your rkats are idle trims and in %; around 2.5% each side which is high as expected but within the 4% spec. they are positive which means the ecu is adding fuel as expected.

your fra values are around 1.3; more than the 1.2 that i’d predicted but close enough for the cocktail napkin math that i’d done. again, they are positive which means adding fuel as expected and, very close to the 1.32 spec which triggers a cel.

so, i think you are good; science wins another one."

:cheers:

Update: Got my 2004 Spyder tune from Prestige Porsche today. I'll put up data after a few drive cycles but for now, all I can say is that she's pulling like a champ! My "Air Intake Mod -epilogue" video will come out as soon as I get the final dyno done. Watch for it! :dance:

Was checking your feed last night for the final video! Lol.

It shouldn't be too long if it would only stop snowing!

glad it went smoothly. recommend getting 50 km or so on the car to get your trims sorted out before dyno. and check your fra's to make sure everything is as it should be before flogging it on dyno.

Judt out of general interest could you explain what those settings are like a general short tutorial. What they should be and what they are. I have had my car 2 years now but just really getting more into the technical stuff.

I will make a brief fairly simple explanation in my upcoming video. For a really comprehensive explanation of fuel trims (as well as other technical stuff) I highly recommend the YouTube channel Schrodingers Box:
https://www.youtube.com/watch?v=5WnM_NsOtd8&t=677s

TRK, Yeah, I'll get some drive cycles in this week and check my trims. So far so good!

http://986forum.com/forums/diy-project-guides/71101-diy-987-air-intake-mod-part-3-a.html

I must say that although I am pleased with the outcome (yet to be confirmed), getting the tune from the Porsche dealer was executed at dealer rates. Since this is not a procedure that they often (ever) do, it took quite a bit of time for my tech to research the possibilities and get my okay and then push the tune. I spent 3 hours there but they only charged me for 2. And hey, I got free espresso and a complimentary car wash!

ow; that's a lot of pesos. here's my intake ...

http://986forum.com/forums/uploads02...1520480097.jpg

oem coupler at the maf holder introduces the bend early on so no contact with the transmission, and provides some isolation to keep engine vibration from affecting maf readings, then just a short coupler and a long-leg silcone elbow.

I like that coupler. I'll have to pick one up to round out my intake

yes, it looks close to factory like that. the only thing that might look even slicker would be to get the custom tube that ipd makes for their setups and use that.

TRK, What size is your metal coupler? That accordion coupler steps down from 3 5/8” to 3” or 3 1/4” ?

i posted part #'s and sizes in one of your other threads iirc. i think 3.25" - it is the same OD as the TB, so everything joins together cleanly.

In that case, I think that your solution is a good one and simpler than mine! The accordion tube would also make it easier to remove the MAF tube for eventual cleaning, etc. :cheers:

one of the other considerations is that turbulence can move upstream of the actual thing causing the turbulence (think bow wave in front of a boat) so what is downstream of the maf can affect its reading.

one can assume that a bending accordion tube creates considerable turbulence, and first instinct is to smooth the flow. apparently porsche calibrates the maf readings to take into consideration this turbulence, however, so best to simulate oem as much as possible.

and did anybody notice the OCD way all my hose clamps line-up? engine's not clean at all, but everything is very orderly.

Yeah, well you can imagine the turbulence if they were all willy-nilly! :eek:

"Pulling like a champ" my exact words from my mods. https://forums.evga.com/upfiles/smiley/thumbup1.gif