L67 tuning with A2A and MAF?

[VX L67 Getrag]

Thats a good idea, where do you get & run the twin cable setup from?

My manometer for LPG reg's might actually come in handy for the first time!

[bldnut]

i use my mano meter a bit for performance (presure drops over intercoolers exhaust back pressure through turbos mufflers and so on) but i hardly use it for lpg and ive been doing lpg since the mid 90's.
theres a few ways to conect the 2 TB, 1 just make a bracket off the factory TB using an old vn vp cable bracket and use a cut up commo tb cable, drill the fact TB to take an old impco 300a pet gas slide cable lock to conect the cut commo cable to the tb and the other end will conect to the 2nd tb,
the other way would be to get a proper cable spliter (1 cable in 2 cables out)
unfortunatly i dont have any pics at the moment if my mate rocks up today with his vr i will put up a pic of his na twin tb set up using the 1st method

[VX L67 Getrag]

Well I think I'm just going to put the last 3 days of trying this down to I need more time, I actually modified the pedal to accommodate 2 cables & set them up as bldnut suggested but I had to make sure the original placed TB was closed completely shut & even then just at idle you could see the hose to the TB on the cold air side pulsing still (this is with bypass valve held open manually too). But it hunted pretty bad & didn't idle right & the supercharger definitely didn't sound right!

Here's the log's & adx of it running with the twin controlled TB's, possibly could have got it better with tuning but just didn't feel or sound right to me!

[bldnut]

are you runing the iac at the engine side and is the iac discontected and closed/blocked off before the charger?

[bldnut]

is the bypass valve working and dose it run in the same manifold plate as the compressed air? or is it bypassing the plate and going straight to the engine

[VX L67 Getrag]

I'm not sure how it goes thru the a2a intercooler, but I have it plumbed so it's open at idle (hi vacuum) & closes when it goes on load.
I'm pretty sure it's sealed thru the a2a so it should be bleeding back into the lower intake manifold.

[bldnut]

the bypass will need to go through the a2a with the compressed air otherwise the charger will still make a small amount of pressure in the a2a, plus the if the bypass is going straight into the lower manifold with out going through the a2a you will have intake air bypassing the maf and causing idle problems and lean under load,

edit: with out the bypass going with the compressed air you will get blower surge not pressure and that may explain why the charger sounds weird (sort of a grind and rap sound)

[VX L67 Getrag]

I didn't put it all together but yeah what your saying makes complete sense, would need to see how the plate for the A2A is (googled & edited & attached image).

So it looks like the maf does need to be before the throttle body on the hot air side or it will affect amount of air not being measured.

I think the original bypass purely just allows air to go through the back of the charger without going into the rotors when not on load.

[bldnut]

looking at that I can see why it didn't work for you, could make a spacer plate that will allow the bypass to go into the a2a and block off the hole at the back (even cut up an old phenolic spacer)

[VX L67 Getrag]

Yeah if I had more time to muck around I would but did a tune on 1 a little while ago with everything in factory positions & worked ok apart from 1 issue with stall between park or neutral to reverse or drive & tried a few things but ran out of time & I believe over time it re-learnt idle airflow issues & didn't happen.
Seeing this 1 has been converted to manual I won't have that issue I did up a quick tune for it with everything back to factory before I left workshop today & think it will be the easiest way for now, bit of a pain with all the effort I went to for all adapters & everything but will do it on the next 1 maybe.