CFM flow rating question

Markus · Jul 6, 2010

Hello guys,

where is the primary bottle neck? Is it my 65mm ford racing throttle body or is it my (unported) gt40 tubular intake?

Any idea?

thank´s

Markus

90lxcoupe · Jul 6, 2010

they both are, a bigger intake and TB would help those heads out quite a bit

tmoss · Jul 6, 2010

If you want to keep the GT40 for some reason, it's needs a full on port of the lower - that will put it at ~250cfm which is still a little shy of the ~275cfm flow potential of those heads, but if your not chasing peak power it should work well. I'd ruin no less than a 70mm TB which is the size of the GT40 upper TB hole.

2000xp8 · Jul 6, 2010

I'm a big gt40 tubular intake fan, but realistically if you want max power with a 331 with afr 185's that's not the intake for you.

Consider an rpmII, 75mm TB and a bigger meter. All of which could be funded by the sale of your parts, so out of pocket isn't too bad.

How much power did you make? I'm guessing you know since you are aware of a bottleneck.

KamiKaziDK · Jul 6, 2010

beautiful car Markus! And Tmoss and 2000xp8 have it right. If you start bolting on some bigger power items though you might want to think about upgrading to 30 lb injectors too, but that's obviously dependent on what kind of numbers you're putting out and how much load is on them.

Markus · Jul 7, 2010

Hello guys,

thank you for recommendations.
I know, the intake AND the tb are a bottle neck for the engine.
But i would NEVER put another intake on the motor. I love it so much
The look and the torque it made is awesome.
The engine make 360 DIN PS (DIN 70020) @ 4700rpm and 420 ft lbs @ 4500 rpm. The car runs very strong but a little torque and a pair of horses are hidden in the intake area.
I´m a big friend of torque. Horsepower is secondary.
The 24 pounder running on wot with 80-85 percent duty cycle with 50 psi fuel pressure. That is not so good.
I have a 70mm accufab tb and a set 30 pounder lying in my garage the only thing i´m missing is a tmoss ported lower
But at the moment my wallet have a big vacuum
Again to my question. Do the 65mm tb outflow the tubular intake or is it converse
Would i get a benefit with only the 70mm accufab before i afford the tmoss lower intake.

thank´s so far

Markus

tmoss · Jul 7, 2010

hard to tell for absolute sure (I think it might) - but a TB swap is SO easy why not try it?

90lxcoupe · Jul 7, 2010

i think if you changed the TB you wouldnt notice a difference, but if you ported the intake that would kick you right in the gooch

SLO_5-OH · Jul 7, 2010

Have the GT-40 lower ported by TMOSS.

KamiKaziDK · Jul 7, 2010

haha, like he said, it's gonna be a little while. Remember he lives in Germany

Markus · Jul 8, 2010

KamiKaziDK said:
haha, like he said, it's gonna be a little while. Remember he lives in Germany

You are also right. I must pay twice as much for the whole stuff like you must.
So my hobby here in germany is a expensive concern.

But i test it with only my accufab tb and the 30 pounders and the ported lower come later.

Markus

KamiKaziDK · Jul 8, 2010

Don't forget you're going to need a MAF set up for those 30 lb injectors too man

Markus · Jul 9, 2010

KamiKaziDK said:
Don't forget you're going to need a MAF set up for those 30 lb injectors too man

Yes, i know. I use a innovate lm-1 and run a tweecer rt. So it is not a problem.
My mass air is a pro-m 75 bullet matched for 24 pounders. I hope it is big enough.

Markus

90lxcoupe · Jul 9, 2010

theres noone in germany that does porting?

Mustang5L5 · Jul 9, 2010

I would think the lower intake manifold would be the biggest restriction of the upper/lower and TB

tmoss · Jul 9, 2010

I'm sure there are - but I bet they don't do many Ford intakes.

CFM flow rating question

Markus

Member

90lxcoupe

tmoss

Gettin Wired

2000xp8

KamiKaziDK

Member

Markus

Member

tmoss

Gettin Wired

90lxcoupe

SLO_5-OH

New Member

KamiKaziDK

Member

Markus

Member

KamiKaziDK

Member

Markus

Member

90lxcoupe

Mustang5L5

That is…until I whipped out my Bissell

tmoss

Gettin Wired

Similar threads

CFM flow rating question

Member

Gettin Wired

Member

Member

Gettin Wired

New Member

Member

Member

Member

Member

That is…until I whipped out my Bissell

Gettin Wired

Similar threads

Privacy & Transparency

Privacy & Transparency