reeperz28

iTrader: (1)

If its still at 78 mm maf opening then you are definitly choking the fast. What is also weird from friends experience that after there 102 install it went lean as hell. Open that intake tract and post up, def in for numbers.

raysadude

iTrader: (11)

that's exactly what i thought, the car should run leaner after the IM install, but no the AFR stay the same...i really don't know if it's in the combo or i did something wrong here...i have NEVER seen anyone in this board losing power anywhere across the board from changing to FAST 102

here's what me and Glen thinking: the IM has the capacity of stuffing more air into the heads, BUT with lower velocity since it's bigger. that's why when the intake got enough velocity AKA high RPM range, it really shines over the LS6 intake. Correct me if i'm wrong.

i'm open to suggestions of what i need to do next.

reeperz28

iTrader: (1)

I beleive your correct. There is so much more volume to fill up the new intake with air hence low rpm but takes longer due to sucking through a straw rather than tsp maf Haha. The way I think of things totally elementary but it works.

raysadude

iTrader: (11)

haha duh...isn't stock MAF good for 500 rwhp?

raysadude

iTrader: (11)

anybody else have comments on this? i'm really stumped..i'm thinking right now the only way to gain more power is with heads like AFR or TFS, i'm thinking swapping the cam, but if i do that might as well do the head. the fk up part is my wallet is $1400 thinner now

MM98

iTrader: (13)

See if anyone close by has a 92mm tb you can try.. It will help with the intake velocity at lower rpms, but still be big enough for your motor.. Take it to the track & see what she mph's.

raysadude

iTrader: (11)

i may take it to the thunder valley tomorrow night. i'm still on denial that fast setup is actually lose power everywhere across the board compared to ls6, especially when everyone's been saying that they gain anywhere from 3000 rpm, the graph doesn't lie and the numbers are corrected, o well..

thunderstruck507

iTrader: (18)

I doubt the MAF is holding you back at this point but as stated in your other thread a stock lid is not good for flow.

Some good heads or having your 243 ported by AI would be a good source for gains. 40-50rwhp gains.

A cam swap would likely be under 10rwhp.

Midnight02

iTrader: (8)

Sounds like something is definitely holding you back. Could be a combination of the stock heads, stock lid, etc. I think you would be amazed at what a head swap would do for your setup.

Johnnystock

iTrader: (6)

MAF is the bottleneck.. still, some plp saw better gain than you with stock cam/heads LS1. Sell that piece of **** LOL.

raysadude

iTrader: (11)

You wanna buy em if I sell em?

gectek

iTrader: (2)

If you can look at the WOT log, it will tell you alot. When you see the map pressure drop more than way 8 kpa from start to finish, or it tanks at one spot, then you know something is amiss. I would ask to look at that first before selling anything.

raysadude

iTrader: (11)

i was kidding when i said i want to sell them, i'll keep them, i know they will help if i go bigger cube, disappointed with the result.

here's the pic of the MAF that's in the car, seems to me it's the 90mm one




here's the pic of lid




and here's beneath my air filter

gectek

iTrader: (2)

Interesting. Seems that is not a bad maf. Looks like it could be the Z06 maf. Since there is no screen in it. But if you are going to the 4" then it will def flow more. Hard to say if you will need it, but they will have to do quite a bit to scale the maf table back.

More could be said if you could either look at the dyno pull logs or even be able to post them up.

2xLS1

iTrader: (25)

Here is the log from his last pull with the graph he posted on the Mustang Dyno. And it's a stock 75mm MAF center section with afermarket plastic MAF ends.

raysadude

iTrader: (11)

thank you Glen.

2xLS1

iTrader: (25)

Weather on 3/9/12 for best pull with LS6 intake:
Temp 58, Humidity 23%, Baro 30.40, DA 921

Weather on 4/4/12 for best pull with FAST 102 intake:
Temp 63, Humidity 54%, Baro 29.77, DA 2052

Also Mustang Dynos don't have the same type of correction factors that Dynojets have.

gectek

iTrader: (2)

DA is quite a bit higher.

All you need is a correction factor diff. and you can calculate the dynojet numbers. Was this with any load on it?

Mazzenger

iTrader: (5)

What about adding an underdrive pulley?
I would take it to the track and see how it does compared to previous runs.

raysadude

iTrader: (11)

it has UDP already