whats the cfm rate from our stock tb's?

And what is the cfm rate from the dual 48's or whatever is stock on the TPI's.

Doing a little simulation

ugh

3.1l, 3.50 bore x 3.31 stroke
stock valves, 1.72 and 1.42
308 cfm at 3.0hg "tuned port"
stock manifolds and mufs
stock cam, hyd, .394 and .410 at 10btdc

I'm only getting 126hp at 4400rpm, and 180tq at 3000


This is off from what the car was rated


The 3.4 sim I did was WAY off

Thats showing RWhp tthough, isn't it? The rating on our cars (Yours being a 3.1 originally) is flywheel hp at 140. So that figure is actually sounding a little high.

yea, if that's RWHP, that's probably a little high. the tq especially.

The stock 48mm TPI unit is 783 CFM at 2"Hg (28" H2O).

The 52mm unit flows 849CFM at 2"Hg.

RBob.

it rates it at the flywheel.

is 308cfm right for the stock TB?

yes, 308 for the stock v6 one

Might wanna look at the duration specs on the cam profile. I worked up a completely stock 2.8, 3.1 and 3.4 In DDYNO, all of them were withing 3-5% of quoted factory specs. Somthing's not right with the way your cam profile is programed.

what program are you using to try to simulate this stuff?

dyno 2000. All I know how to change on it is lift and "stock, street, race" etc.

there's gotta be an option in there somewhere to change duration. duration is what makes a cam good or bad for the most part. keep looking around inside the program, i'm sure you'll find it. that can really change your hp numbers.

Under "cam math" in the toolbar. Don't frget to set to .050".

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