FAST XFI tuning question - Page 13 - Lateral-g Forums

**GregWeld** · #**121** 04-16-2010, 08:54 PM

Got the Intake today -- it has a HUGE common plenum built into the floor - and a removable plate on the valley side... SWEET! Nice quality piece. Casting quality and machining are top notch.

There is a half inch hole in each runner porting to the common plenum - and there are 3 threaded ports for various vacuum "items". This is going to be a huge improvement over my Webber manifold!

I'll post up some pics tomorrow.

**GregWeld** · #**122** 04-17-2010, 06:32 PM

Just a couple pics of the 8 stack EFI Inglese intake == showing the common plenum they've built in. A really nice piece! Note the THREE ports in the floor.

A removable floor piece on the valley side....

With the floor piece removed...

Look into the intake port and you can see the 1/2" holes for the vacuum source "under the blades"... NICE!!!

**waynieZ** · #**123** 04-17-2010, 07:21 PM

Thats a beautiful looking intake.

**GregWeld** · #**124** 04-17-2010, 07:37 PM

Thanks Wayne! The casting quality is just first class all the way - far better "as cast" than my Weber version!

**camcojb** · #**125** 04-17-2010, 07:38 PM

what's the max diameter butterfly they'll accept?

Jody

**GregWeld** · #**126** 04-17-2010, 07:57 PM

Good question Jody -- I have no clue!

My throttle bodies are 2"... and based on the IDA Weber "platform"....

I don't know what the flow rate is - if you stacked all 8 and did a WOT -- but I'm thinking it's way more air than my motor will ever need!!

In fact - I've thought about that many times - thinking about the blades on a 850 CFM Holley -- and then comparing that to the "area" of 8 x 2" holes... I'm thinking these manifolds have to be capable of 1200 CFM plus?

**camcojb** · #**127** 04-17-2010, 10:03 PM

Quote:

Originally Posted by GregWeld

Good question Jody -- I have no clue!

My throttle bodies are 2"... and based on the IDA Weber "platform"....

I don't know what the flow rate is - if you stacked all 8 and did a WOT -- but I'm thinking it's way more air than my motor will ever need!!

In fact - I've thought about that many times - thinking about the blades on a 850 CFM Holley -- and then comparing that to the "area" of 8 x 2" holes... I'm thinking these manifolds have to be capable of 1200 CFM plus?

well, total cfm doesn't mean a lot when you're speaking of individual runner setups. There is no "borrowing" for a cylinder like there is in a common plenum setup, the max airflow for a port is whatever that port/blade can flow.

I remember with my Hilborn setup, it used 2 3/16" blades which seem huge; flowed like 280 cfm per port , so like 2200 cfm total.................. problem was my heads were good for 312 cfm per port (intake), so I actually was pulling 2-3 inches of vacuum at wot, showing the flow restriction.

With higher hp IR setup you need to make sure they can flow enough to support your power level. Many of the smaller setups will support maybe 500 hp or so; not a problem with most engines but something to consider with a stronger build or larger engine.

Jody

**GregWeld** · #**128** 04-18-2010, 07:16 AM

Right! Good points Jody!

For me - this won't be an issue... and these manifolds (my Weber and this new one) will only cover an intake port using Fel Pro 1205 gasket size... so you're automatically limited to a smaller set of heads from the get go.

I could go as large as the Dart Pro 1 200cc head... But these intakes won't cover the set of Canfield 220's I have which have the raised ports.

I'm just building a "hot rod" motor - as I've mentioned before. Going for more bottom end - cruising and street manors this time around... and this is an "experiment" to try out the FAST EZ EFI. I'm not even taking the Accel Gen 7 stuff out of the Nomad until this new set up proves itself on the engine dyno!

**camcojb** · #**129** 04-18-2010, 08:09 AM

Quote:

Originally Posted by GregWeld

Right! Good points Jody!

For me - this won't be an issue... and these manifolds (my Weber and this new one) will only cover an intake port using Fel Pro 1205 gasket size... so you're automatically limited to a smaller set of heads from the get go.

I could go as large as the Dart Pro 1 200cc head... But these intakes won't cover the set of Canfield 220's I have which have the raised ports.

I'm just building a "hot rod" motor - as I've mentioned before. Going for more bottom end - cruising and street manors this time around... and this is an "experiment" to try out the FAST EZ EFI. I'm not even taking the Accel Gen 7 stuff out of the Nomad until this new set up proves itself on the engine dyno!

it's a great looking manifold, and I really like the plenum deal they did. I just wanted people to know that total cfm of airflow with an IR setup can be quite misleading and is not quite what it is with a common plenum setup.

Jody

**GregWeld** · #**130** 04-18-2010, 11:52 AM

Quote:

Originally Posted by camcojb

it's a great looking manifold, and I really like the plenum deal they did. I just wanted people to know that total cfm of airflow with an IR setup can be quite misleading and is not quite what it is with a common plenum setup.

Jody

YOU'RE RIGHT! It's all based on a single hole!

I do LOVE the instantaneous throttle response they deliver!

You crack the throttle - you go zoom zoom... :>)

Talking to a tuner about IR's -- he says that to tune them correctly you have to add cells to the tables - especially down low (high vacuum) because you crack the throttle and there's lots of AIR but no fuel... so he redefines the tables to be able to have the cells (more and closer) to react to that inflow of air. Made sense to me.

I'm not using the correct descriptions for the tuning part - but you get what I mean.