dang... i'm still waiting to get all my parts so i can install (but i haven't started yet)... it must be tough knowing you're 90%+ done and can't drive it yet. any updates?

Pullthrough or blowthrough, the amount of air passing through the MAF is the same.. If your engine is pulling too much air and pegging the MAF you can always use a bigger tube and rescale it (i'm sure the AP is capable of that..). No reason to go to a MAP setup and start getting at VE values...

I've got a track day a week from saturday. So its going to be operational then or I'll be a monkey's uncle.

I did sign up for the slowest class though, I'll be happy just taking a cruise and using the straight-aways for test and tune.

Yeah, but I've always wanted BOV sound, and with a MAF setup you have to recirculate it.

+1 For the BOV sound :D

While I'm still in the design/construction stage, would it work if I put the MAF right before the throttle body?

Why meter air, then vent it out the BOV?

The MAF would also give real inlet temps instead of pre-turbo/intercooler temp....

....or am I out to lunch?


S

You don't have to, but MAF based systems act funky when you vent the BOV though.

I would be in your shoes too, but having had 3 different BOVs and having run them for over a year, I'm OK with no noise in exchange for a OEM-like turbo setup.

with a blowthrough MAF setup you might get away with venting to atmosphere

We get away with it... :)

The mass is the same, but its flow qualities are vastly different and the MAF doesn't respond correctly.

Yes, as long as the BOV is before the MAF.

However, you will not get predictable results with the RX-8's MAF in a blow-through arrangement.
With a LOT of judicious tuning, you can get it to work, but it will behave as if significantly more air is passing through it than reality, thus limiting its range.
Scaling the tube to accommodate for this will remove a significant amount of sensitivity, thus adversely affecting the idle.

Gotcha, leave it where it is.....

S

I'm trying to understand this point from a theoretical perspective..

The MAF is supposed to be able to compensate for changes in density of the air passing through it (at least, within the limited range of varying altitude / weather conditions).

If a blow through setup will result in higher readings than a draw through setup for the same amount of air, does that mean that the readings are also affected by pressure? Higher pressure (boost) packs the air molecules closer together, so they take away more heat from the wire than the same amount of molecules spread further apart but moving faster?

MM: Sounds like tuning this turbo with an AP is going to be a bit on the challenging side...

It seems that it is just a quirk of the MAF itself, not a science thing.

Challenging, yes.
Impossible, no.

It just means more work and the "standard" tunes wont do.
Since I don't, as yet, have direct experience with this kit, anyone using the AccessPORT on this system will require special attention.

blowing thru the MAF tube creates turbulence in the air stream that does not occur in the draw thru systems the MAF is designed for. That turbulence creates inconsistent and generally higher readings than is reality.

read thru this thread https://www.rx8club.com/series-i-engine-tuning-forum-63/fi-maf-sensor-130428/ and the links i have posted there. ill dig out more if you need them.

EDIT: i should note that many people have done blow thru systems for years and had good luck with them. it does allow you to vent the BOV to atmosphere. it s just not the way I consider to be ideal

danke

damn, your gonna have one badass car.

as i mentioned elsewhere:)

D"OH we dont need to be chained to the factory MAF any longer!! why was i not thinking about this ?!!

replace it with a MAF that was designed with blow through in mind and then get a good tune on it with a FLASH.


http://www.vmptuning.com/store/index...=234&parent=29



with the ability to flash we can ditch the OEM MAF if we want:)

:evil_laug :evil_laug :evil_laug

That doesn't sound like a bad idea but do you think it will actually work like the OEM unit?

yes :) thats the point actually

im confused the option they gave us for plumbing to the exhaust was for the wastegate right? so then is this BOV vent to atmosphere or plumbed in? I guess i would have to get it all together to see lol

EDIT: I tried to use that Mac Tool Fuel Pump Removal Tool and it didn't work at all I will be returning it, theres not that much room to get the tool in. Also the slots in the tool where the fins on the ring would fit in are too big if you put any kind of torque on it the tool slips off.

The BOV vents to atmosphere...yes you will hear it :D

Excellent...... My girlfriend told me that she would kill me if I spent that much money on a kit and it didn't make the cool PSST sound :lol:

Marry that girl! :icon_tup:

Pics or it didn't happen.

LOL well then.. here you go
http://i28.photobucket.com/albums/c2...x8/nina066.jpg
BTW i hate pictures :icon_no2:

She is hot for sure but dude who is the nerd next to her putting his arm around your women? You need to do something about that dude!

:lol: lol, so messed up (perhaps jealousy :uhh: )

anyways... u have a hot g/f who loves the sound of the BOV and a kickass kit... ur a lucky man :)

lol! Im just gonna go hang myself now :P We were on vacation leave me alone! Enough thread jacking I wanna see a video or dyno ro something

oh... you don't have the kit. i misunderstood.. hahaha:spank:

haha u understood right the first time i do have a kit :)

Will this simply expand the range of flow compared to the OEM MAF?

Is it a matter of hooking up and flashing or is it more complex?

isn't this for mustangs?

Started her up last night with the stock PCM, it ran :) ! for like 20 seconds and then died.

I'm back to all stock plugs, and I used the windshield washer fluid deflood technique (pull plugs, squirt windshield washer fluid in, crank a few times).

Tonight I'm going to try with the INTx, I think the throttle calibration may be off, and I'll adjust the startup richness to get it to stay good. I'm expecting it to startup tonight.

I said screw-it to coils and radiators, I have the stock stuff in. That will be good enough for the next few weeks.

Throttle calibration was off by 27%!

That was the reason why my yellow light on the INTx was not lighting up when I was trying to start her up the first time.

I'm still not too sure about my after idle enrichment setting, but tomorrow I'm sure she will fire up without a problem!

isnt the Cobb for scoobies?

Who uses MAF for turbo anyway? :lol2: :rolleyes:

any body who knows how a maf works

Allow me to rephrase that:

< HUMOUR >
Who uses MAF for turbo anyway?
< / HUMOUR >

:rolleyes:

CHRIS!!!

HOLY SHIT!!!!

Great job on the turbo kit!!! It's exactly what I wanted!!!!

Driving normally I get perfectly stock like performance!

But when I press my foot down more than 3/4 of the way, I get instant power boost!!! Oh, I am absolutely loving the wastegate to atmosphere, sounds amazing!!!!!! Not too loud but it definetly sounds like my car has some serious balls.

Chris, Jason...

Guys, I'm so pleased with the kit. Its nice!!!!

Turns out the flooding and the trouble starting the car was caused by the INTX not being calibrated to my throttle. Fires right up now!!!!

I think that the person I bought the INTx from may have set a rev limiter at 6K, I can't seem to go past it without getting backfire noise (or it may be the weak coils after all). I need to borrow a laptop again to check this.

I'm getting 19inHg vacuum when at idle.

I get AFRs around 14.7-15.3 when cruising in vacuum of greater than 10inHg

I get AFRs of ~13 while at 3/4 throttle and 2-3psi
I get AFRs of 10.0 when at WOT and 10psi!!!

Statig,

I am very pleased to hear of your success with the kit. How many psi are you running max? If you are at 10psi or above and at 10afr your car will miss fire at around 6000rpm when the APV opens up because all the air/fuel going into the engine will saturate the combustion chamber to the point where its hard to get an ignition going. We're working on the ignition upgrade to fix this :). In the meanwhile, you can tune the "idle" map from 2psi and above and adjust it slightly so that your in boost AFR stays closer to 11:1. This will help with the misfiring as well as release some extra HP. If your coils are good you should be able to run 10psi without misfiring all the way up the range. Make sure you keep an eye on the AFR gauge and confirm that the misfiring isn't caused by the afr spiking up or down in that range, if it is Pm me and I will give you some tuning tips. If you don't feel comfortable with this call me and I'll help you over the phone.

Good luck!


Chris

are you running on stock coils? If you were to get an upgraded ignition kit... but use stock trailing spark plugs, would these issues still occur?

OH MAN BUT CONGRATS MAN!!

^Yes, he is currently running stock coils.

:wiggle:

Show us some sweet vids!!

Congrats on gettin it goin! UGH, now I can't wait to get mine in. I hate you :P Can you post a vid of how it sounds? Do you already have 500 miles on the kit to push 10 psi already?!

have you taken it off any sweet jumps? jk glad the kit is a success and you like it