shooter

iTrader: (2)

Oh yes MAP on the back of the intake is plug in.

Sales4@Texas-Speed

iTrader: (4)

Have you got it tuned for the 90/90 swap yet? I might be wrong but I believe you have to get the car retuned for the new intake and TB. The computer can't just learn this change compared to going from a stock TB to a ported TB. Let us know what you figure out!

John

shooter

iTrader: (2)

I've talked with several people that have done swap, wrote that question on the board and was told the tune can wait until I do my heads and cam swap that I'm going to get from you guys.

99blancoSS

iTrader: (115)

I thought the FAST thing was a sticky return spring or something like that

shooter

iTrader: (2)

I'm not really sure just beating my head on the wall.

PunkNPonys

iTrader: (2)

I heard that the car has to be re-tuned for the 90/90 swap also. If everything else was installed properly then i would get that car re-tuned ASAP. Goodluck.

Red99TA

iTrader: (11)

You shouldn't be running that crappy w/o a tune. It sounds like something else isn't right like a vacuum leak or a sensor not plugged in maybe. I didn't change my tune at first when I put my 90/90 on and I wasn't running badly at all. Now I do have more mods/cam/etc but I can't imagine the tune getting that f-ed up just from an intake/tb. As mentioned you can pull a plug to see if it's running super rich. I would expect it to be leaner now that you're sending more air in anyways.

shooter

iTrader: (2)

I'm going to pull a plug tonight 1-2am after work and post up my finds.
Thank-you agian for all the input.

brad8266

iTrader: (23)

Car does not need a tune unless you are running a vette drive by wire throttle system. The F-body cable system take the needing a tune out of the equation.

FAST90/90 on an F-body= No tune needed to run

FAST90/90 on a throttle by wire system like the vettes = Tune needed

shooter

iTrader: (2)

Hmmm so the plot thickens this is very good info thank-you, I was considering put it back to stock but It sounds like I #$%ed something up.

vettenuts

iTrader: (4)

The throttle body should be even with the intake. If you used the FAST gasket for the TB, then it is very stiff and likely can't be fully compressed as only 50% of the o-ring fits in the groove of the intake. A face seal needs about 20%-30% compression, or in this case 0.028-0.041" of compression. If you tighten it evenly, you will have a gap all the way around and it should be even. I did mine last night on the work bench (a definite advantage) and have 0.016" gap all the way around. Tony Mamo mentions this in his instructions, overtightening can damage the ears on the intake where the TB attaches. Also, if yours is noticably uneven, there may be a leak source there.

On the intake itself, did you use the FAST gaskets? The stock GM gaskets don't work to well from what I have read, especially if re-used. How tight did you go and did you go slowly in steps? This manifold appears to be more flexible than the stock unit and not going slowly in steps can lead to a leak. From the sounds of things, you may have a leak that is messing things up.

Very interested in any lessons learned you have.

99blancoSS

iTrader: (115)

Silly question but did you forget to put the pcv back in or get in in backwards?

shooter

iTrader: (2)

I don't mind the question, I did I wish it would be that easy.
I think I'm going to yank it off and go back to stock and see what happends.

shooter

iTrader: (2)

actual this may be a good point backwards?? how would I know??

99blancoSS

iTrader: (115)

Good question. I'll have to go rip it out and see what it looks like to be able to tell which end goes where. Its a new pvc right? It isnt clogged is it?

shooter

iTrader: (2)

It's not new I used the same one.
clogged not sure but i only have 28k miles on the car.

99blancoSS

iTrader: (115)

28k on the car... NICE! Wish my odometer read that low.

shooter

iTrader: (2)

wish mine was running like yours.

sidewayz28

iTrader: (24)

after i swapped heads and 90/90 my car doesnt find its idle unless i help it, usually just surges until it warms up a bit, but nothing major. its probably just the tune

shooter

iTrader: (2)

I been hearing that M6 act alot better on a 90/90 swap then an A4's thends to act up alot more?