LS325ci

iTrader: (3)

since the Stock ls1 maf is only 75mm does that mean a fast 92/92 will yield minimal gain?


im thinking of the following mods

243 heads
224r cams
shorty headers(smog-pacesetter)
2.5" or 3" true dual havent decided
underdrive pulley
lid (unsure of brand at the moment)


im trying to decide if im better off picking up ls6 intake w/ stock tb and maf
rather than fast 92/92 and running it w/ stock maf which is only 75mm.

M4N14C

iTrader: (3)

Shouldn't be but I'll be getting a 100mm MAF when I get my 102/102 setup.

Then again you could just ditch the MAF and get a SD tune.

Fry_

Have you considered getting a 85mm truck maf. The shorty headers will be the biggest restriction regardless of what intake or maf you use so not sure is it matters anyway. Also although the 224r is a long proven cam there are better cams that will have the same if not better low speed manners. Also is your car a A4 or M6.

LS325ci

iTrader: (3)

Not interested in SD. As it will be smog compliant car.
Which is also why 224r was selected.

And I have I was looking at z06 which is 85mm.but it needed calibration. Either way it's not 92mm.

Im just wondering if a bottle neck in the system wouldn't make it worth it getting fast vs ls6 stuff.

Goals is to get to around 400whp I figured I'll be close if not there with or without fast 92.

I feel like air lid. Stock maf. Stock tb and ls6 intake is a much smoother system than stock maf w/ fast 92/92

If I can do it without and spend it on fast 92/92 then I would rather do that.

A4 Btw

garygnu

a fast intake mite not pass for smog legal.you won't reach 400 rwhp with your planed combo .

idle

iTrader: (5)

458 RWHP with stock MAF. See sig.

BrntWS6

iTrader: (7)

Th GM MAFs are actually 90mm even though it says 85mm. They come up on eBay all the time for ~$40

thunderstruck507

iTrader: (18)

The gains from the Fast are not really much to do with TB opening size, the power is in the plenum volume and runner design.

The stock MAF flows enough that it takes somewhere over 400rwhp before switching to a bigger one gains anything. Even at closer to 500rwhp I've seen cars only pick up 10hp or less in the dyno section here.

I switched on my car from a stock screened maf to an 85mm GM maf with a less restrictive screen and gained nothing at the track even corrected for weather.

LS325ci

iTrader: (3)

yes i know they can flow im wondering if it would make a restrictive system.

im already reconsidering going to LT and just swap back when its time to smog. but cams I dont want to bother swapping.


is that the actual plate measurement or just the housing?

thanks im just trying to figure out if the the maf will cause a bottle neck effect. what was the mods done to your car when you switch?

10hp or less is pretty good if that can be picked up with 85mm maf vs factory. hp/$

Fry_

If your looking to be California smog legal your going to be stuck with a LS1 intake or SLP modded LS6 intake with EGR, I don't think SLP still makes them anymore and I'm not sure if they're smog legal anyway. Also I think JBA is the only company making California legal headers. Even trying to stay smog legal I'd say there are probably better cams I'd talk to some of the vendors hear about it. With California being as big of a pain as it is I'd just do a lid, catback and a Yank SS 3600rpm stall converter. If you were planning to run a cam with the stock converter I'd bet a stock car with a good converter would be faster anyway.

thunderstruck507

iTrader: (18)

my car is: 230/238 cam, mildly worked 799 (like 243/ LS6) heads, longtubes, 3" dual exhaust, underdrive pulley, ported Fast 90 intake, 90mm throttle body

LS325ci

iTrader: (3)

true except a blackout(logo removed) fast 92 looks the same as a stock ls1/ls6 to an untrained eye(unless the smog tech or cops are familiar with both they most likely not be able to tell.) Im new to ls1 and they look the same too me (untill i started looking at the details.) it has egr provision that needs drilling so no problem with egr install.
and they dont make them anymore. I looked.

Im also trying to find a way to get copy of sticker or plate? from edelbrock carb eo tb 85mm tb to place on my ptm 92 tb.

pacesetter also makes smog/carb eo headers. they are discontinued i think but i found new ones from a vendor on ebay.
but im thinking going lt and just swap back to smog. we will see how far "legal" looking the car will be before i decide if i want to add LT.

and that cam is texas speed recomendation. i was originally looking at cheatr cams but couldnt find one.

ss has 3600rpm stall converter... I was literally looking up cheaper converter options lol thanks ill look this up.

unfortunately LIDS are also technically illegal... so if i stick with stock maf and carb shorty everything will look factory except lids.

although im thinking of getting that sticker that goes on factory lids and putting it on the blackout lids.

thanks for the reply.

I see, thats pretty close to what my plans are. i guess ill be sticking to stock maf, thats one less thing to calibrate.

thanks

z-maro

iTrader: (18)

If you aren't concerned about the price get a SLP Blackwing lid. It was the factory lid on '02 Firehawk's and the 345hp SS's, and has the sticker on it just like the stock lid yet flows like an aftermarket lid.

LS325ci

iTrader: (3)

that i would have to wait around for a good deal on. i dont feel like spending 250+ on a lid when a slp lid sells for 100 new...

but ill definitely keep an eye out on that.

thunderstruck507

iTrader: (18)

Couldn't you put a factory sticker over the SLP logo?

LS325ci

iTrader: (3)

thats the original plan. and hope for the best lol

z-maro

iTrader: (18)

That would probably be fine too, sometimes you can get a blackwing for around $200 but that is still a lot of cash for a lid.

Would it work to tack weld a carb co tag onto a set of LT or mid length headers, or would the inspectors pick up on that? I have never had emission testing, so I have no clue how detailed of a job they do.

LS325ci

iTrader: (3)

ya if I find one ill grab it now and not worry about it later.

it really depends on the smog tech. I have no first hand experience with state ref but from what people have said if you ever get sent to one, everything better be legit or stock.

as far as smog tech goes if they know better its a fail. some dont double check the carb number and such.
in all technicality relocation of cat is illegal and aftermarket cat is also illegal. so it depends on the tech knowledge.

fake carb stamp are good for avoiding fix it tickets IMO.

MonmouthCtyLS7

iTrader: (6)

No way.

DANOZ28

iTrader: (1)

assuming you have a 5.7 not a 5.3 i would go with a ported 75mm maf matched with a 78mm fast or an 85mm maf matched with a 90/90. just my one cent. i dont think anyone makes a 90mm maf. ps i know nothing about passing emissions. goodluck!