FAST 102 not flowing enough?

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Jan 28, 2016 | 12:44 AM

VandykeT/A

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From: Hurley, VA

FAST 102 not flowing enough?

I've got a 408 T56 car that made 570/522 on a loaded dynojet. Above 6800 the car has a noticeable power loss at the end of the track. I can feel the front start sitting down then I'll eventually hit the limiter. It doesn't have a misfire or erratic feeling. It just seems like It just starts losing power those last few hundred rpm. Is it possible the intake isn't flowing enough air up in the 7-72k range. It's a vengeance ported 102, 102 TB, fast toys 104mm lid speed density and chrs1313. Heads are PRC247 251/259 cam. 11.5 compression with 1 7/8 headers and 4" exhaust.

Jan 28, 2016 | 03:43 AM

HCI2000SS

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From: Howell & Fenton MI

If you are only wanting to rev to to 7k then the 102 should be plenty from what I understand

Jan 28, 2016 | 05:02 AM

scotty2000ss

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From: Roseville, CA

Quote:

Originally Posted by VandykeT/A

Does the intake have the runners shaved down or are the ports cleaned up? Or both lol

Jan 28, 2016 | 05:15 AM

MonmouthCtyLS7

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From: Rotonda West Florida

I doubt the problem is the Fast, especially seeing its ported by Vengeance.

Jan 28, 2016 | 08:06 AM

hellbents10

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From: Spring Lake, MI

Need to see what kind of manifold vacuum you have at 6800+. If its little to none, then the intake is good at that point. I would suspect valvetrain first though.

Jan 28, 2016 | 08:08 AM

Rise of the Phoenix

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From: Jefferson City, MO

I agree that the issue likely lies in the drivetrain. I don't see the FAST intake being the issue, especially only taking it to 7,000 to 7,200 RPM's.

Jan 28, 2016 | 08:12 AM

redtan

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From: Belmont, MA

Quote:

I would suspect valvetrain first though.

I would say the same thing, sounds more like valvetrain related than not enough airflow from a ported FAST 102.

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Jan 28, 2016 | 11:54 AM

farmington

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From: Little River SC

check your sparkplugs. try closing gap down .003-.004

Jan 28, 2016 | 01:08 PM

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Rise of the Phoenix

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From: Jefferson City, MO

On a side note, what exactly are you running in the quarter mile, and what's the trap speed? If I remember right, this car put down some really high dyno numbers.

Jan 28, 2016 | 02:54 PM

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dr_whigham

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From: Lafayette, LA

Yeah, I'd like to know the kPa from the MAP from 6k to shift myself...

Jan 28, 2016 | 04:53 PM

#12

KingJacobo

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From: Kennesaw, GA

Just curious, if a fast 102mm was bottle necking you what would be a better flowing intake?

I always thought the 102 was the holy grail of street LS intakes.

Jan 28, 2016 | 05:14 PM

#13

VandykeT/A

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From: Hurley, VA

Quote:

Originally Posted by Rise of the Phoenix

On a side note, what exactly are you running in the quarter mile, and what's the trap speed? If I remember right, this car put down some really high dyno numbers.

Car made 570.63 and 522tq on a loaded Dynojet. I think the loading jacked it some. It made 535 through the air box set up. Loaded the dunk and it made 555. Pulled the lid and ran open bellow and jumped to 570.