What intake diameter for 900+ hp?

[JetmechF16]

I am starting to trace out my intercooler piping and intake design for my 5.3/F-1A-94 build and am not sure if I am fine with 3" or need to step up to 3.5". The blower discharge and intercooler inlet/outlet are all 3".

I am using a PMAS HPX MAF and should be making around 25 lbs of boost and 900+ hp on e85 (hopefully). Am I fine with a 3" diameter intake pipe from intercooler to throttle body or do I need to add a step-up to 3.5" out of the intercooler?

It will be very short routing: exit out of top of intercooler and go straight over the top of the radiator support (hood latch is deleted) to the throttle body, maybe 3' total.

Thanks guys!

 

[98 Saleen Cobra]

I'm running 3.5" piping from my JT trim to intake. It was recommended I do from AED who built the car. This is also in preparation for a turbo down the road or a bigger blower..
I made 910rwhp on 16psi and 19* of timing on E85 with my combo fwiw.

For a inlet to the blower I have a custom 4" pipe with a extremely high flow filter used on most diesel truck intakes lol

 

[JetmechF16]

I'm running 3.5" piping from my JT trim to intake. It was recommended I do from AED who built the car. This is also in preparation for a turbo down the road or a bigger blower..
I made 910rwhp on 16psi and 19* of timing on E85 with my combo fwiw.

For a inlet to the blower I have a custom 4" pipe with a extremely high flow filter used on most diesel truck intakes lol

My blower inlet has a kitchen strainer from Kroger on it haha, since I'm running a HOB dedicated drive setup nothing else is fitting on there. I'm sure my boost numbers will be high with stock cams and stock manifolds @ 7k, hoping to go to a JBA midlength full 3" system later.

I'm going to mount the Big Red Race valve inside the fender to avoid kicking up dirt and debris into the blower.

 

[98 Saleen Cobra]

Yea your boost is going to be high with the stock intake I assume 01 Cobra, and the exhaust setup.. I would skip the JBA's and go right to Kooks or ARH in a 1-7/8". I'm only running a 1-3/4" Kooks but a full 3" off road setup into magnaflow dumps.

Again I would do a 3.5" all the way from the blower to intake. It'll set you up later on down the road if you throw a Sullivan on it etc.

 

[04whitesvtlight]

My intake pipe from intercooler to throttle body is also 3.5”. it might depend on which maf you plane on using.

 

[98 Saleen Cobra]

Oh that's right ya'll are running a MAF.. That is a good point that I forgot about.. I don't run a MAF due to a stand alone ECU. I'd still try to run 3.5" piping

 

[01yellercobra]

FWIW I ran a 4" inlet pipe to the blower and basically 3.5" from the intercooler to the throttle body. I want to say I had an adapter that went from 3"-3.5" right off the intercooler and from there to the TB was 3.5". I had a BA5000 MAF mounted to the pipe right by the fenderwell. Basically it was in the stock MAF location. I was only at 19psi with my F1A on the big bore but the MAF counts were in the mid 700's. So I knew I had room to grow.

 

[JetmechF16]

Yea your boost is going to be high with the stock intake I assume 01 Cobra, and the exhaust setup.. I would skip the JBA's and go right to Kooks or ARH in a 1-7/8". I'm only running a 1-3/4" Kooks but a full 3" off road setup into magnaflow dumps.

Again I would do a 3.5" all the way from the blower to intake. It'll set you up later on down the road if you throw a Sullivan on it etc.

I have a Sullivan lower and HPP upper with custom LFP big-mouth throttle body.

 

[JetmechF16]

FWIW I ran a 4" inlet pipe to the blower and basically 3.5" from the intercooler to the throttle body. I want to say I had an adapter that went from 3"-3.5" right off the intercooler and from there to the TB was 3.5". I had a BA5000 MAF mounted to the pipe right by the fenderwell. Basically it was in the stock MAF location. I was only at 19psi with my F1A on the big bore but the MAF counts were in the mid 700's. So I knew I had room to grow.

Awesome, the adapter is a good idea, I think that's what I'll do. I won't have a blower inlet pipe at all, just a kitchen strainer haha. As for the MAF, it will be mounted at least 12" after the bend over the radiator support.

 

[JetmechF16]

Here's a pic so everyone has an idea of what I'm working with:

 

[98 Saleen Cobra]

Oh ok.. Good looking setup, I wish you had head and cam work though lol

 

[98 Saleen Cobra]

Oh ok.. Good looking setup, I wish you had head and cam work though lol

 

[01yellercobra]

I always wanted to try the Sully intake. Plus I think it's an awesome looking intake.

I should probably stay out of your threads. They make me want to swap to a centri.

Sent from my SAMSUNG-SM-G935A using Tapatalk

 

[JetmechF16]

Oh ok.. Good looking setup, I wish you had head and cam work though lol

So do I!

 

[c6zhombre]

Here's a pic so everyone has an idea of what I'm working with:





View attachment 1504302

Looking good! It's going to be an animal 25psi on the corn

What did you decide on the tuning?

 

[JetmechF16]

Looking good! It's going to be an animal 25psi on the corn

What did you decide on the tuning?

Thanks! Hopefully so. I’m going to try Robert at Vendetta Speed.