AAM Intake Manifold Q

GeauxTigers1 · 02-04-2020, 01:07 PM

Yes I know, there's a ton of info on it and I've read about it. We actually experienced approx 35 hp loss with the manifold so originally took it off and went with the stock intake manifold. HOWEVER, if I'm able to run more boost (20-24lbs) safer, I'd rather go that route and lose the 4% hp. Has anyone actually had issues with their stock manifold cracking or failing?

nic370 · 02-04-2020, 01:08 PM

.

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Spooler · 02-04-2020, 01:19 PM

Ask Seb what he thinks. Headgasket's start popping at 24psi of boost even if you have a RJM closed deck block and ARP 625's. Not sure how your motor is built but I would be more worried about that. Have you look inside the manifolds runners? You may find some casting flaws that need to be cleaned up. I ran 22 psi sparingly with no issues.

GeauxTigers1 · 02-04-2020, 01:59 PM

Quote:

Originally Posted by Spooler

Ask Seb what he thinks. Headgasket's start popping at 24psi of boost even if you have a RJM closed deck block and ARP 625's. Not sure how your motor is built but I would be more worried about that. Have you look inside the manifolds runners? You may find some casting flaws that need to be cleaned up. I ran 22 psi sparingly with no issues.

yep! Have Seb Scheduled for 2/13 for a full tuning visit. JMS did a great tune but there's nothing quite like having the "godfather" of all Z's having a look

The JMS Stage 2 Shortblock build included JMS Spec CP Pistons/Carillo Rods, ARP Mains Studs, New Main, and Rod Bearings.

Did have the Cosworth Head Gasket added during the build but again always like to get his input. I'll probably just bring the intake manifold with me and have him take a look at it.

Hotrodz · 02-04-2020, 02:10 PM

I am in agreement with Spooler. That manifold is only good if it is ported and polished. You would be better off doing a GTR manifold conversion. Just Spooler pointed out the issue is head gasket problems when you get above 18 psi which is long before the upper manifold becomes an issue. The oem manifold will start to fail at about 25 psi. My two cents, don't fix what's not broke!

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Spooler · 02-04-2020, 02:21 PM

Quote:

Originally Posted by GeauxTigers1

yep! Have Seb Scheduled for 2/13 for a full tuning visit. JMS did a great tune but there's nothing quite like having the "godfather" of all Z's having a look

The JMS Stage 2 Shortblock build included JMS Spec CP Pistons/Carillo Rods, ARP Mains Studs, New Main, and Rod Bearings.

Did have the Cosworth Head Gasket added during the build but again always like to get his input. I'll probably just bring the intake manifold with me and have him take a look at it.

Do you have a closed deck block and what head studs were used? I am just asking to help prevent you from doing a blunder like I did. Seb is going to grill you anyways. LMAO.

nic370 · 02-04-2020, 02:24 PM

Sorry to thred hijack what comp ratio are you guys running on your fi builds ?

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Spooler · 02-04-2020, 02:47 PM

Quote:

Originally Posted by nic370

Sorry to thred hijack what comp ratio are you guys running on your fi builds ?

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I run E85 so I stayed stock compression ratio at 11:1.

GeauxTigers1 · 02-04-2020, 02:56 PM

Quote:

Originally Posted by Hotrodz

I am in agreement with Spooler. That manifold is only good if it is ported and polished. You would be better off doing a GTR manifold conversion. Just Spooler pointed out the issue is head gasket problems when you get above 18 psi which is long before the upper manifold becomes an issue. The oem manifold will start to fail at about 25 psi. My two cents, don't fix what's not broke!

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This is EXACTLY what I was looking for! Read on a previous thread when I was researching AAM, that OEM manifold started to fail at anything above 20lbs and that's what started my brain going haywire.

Hotrodz · 02-04-2020, 02:59 PM

Copy that!

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GeauxTigers1 · 02-04-2020, 03:00 PM

Quote:

Originally Posted by Spooler

Do you have a closed deck block and what head studs were used? I am just asking to help prevent you from doing a blunder like I did. Seb is going to grill you anyways. LMAO.

Yep, closed deck option added, ARP L19 Head Stud Kit

Quote:

Originally Posted by nic370

Sorry to thred hijack what comp ratio are you guys running on your fi builds ?

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As spooler mentioned there seems to be quite a few running different compression ratios. I'm running Wiseco Piston 9:1

Spooler · 02-04-2020, 03:00 PM

I wouldn't do a GTR manifold conversion. The runners are too long and will cause issues in the midrange.

GeauxTigers1 · 02-04-2020, 03:01 PM

Quote:

Originally Posted by Hotrodz

Copy that!

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sometimes reading previous threads is a great thing, othertimes it starts a spiderweb of thoughts and worries. lol

phunk · 02-04-2020, 03:26 PM

Never heard of a stock manifold failure. Im sure it will eventually let go if you keep increasing boost pressure.

Your signature says youre running 800ftlb torque.. that is approaching (if not well-in) the danger-zone for VQ headgaskets. You could be an exception. But if you are looking to stay on the safe side of things, I wouldnt be worried about your intake manifold I would be worried about your headgaskets.

Spooler · 02-04-2020, 04:06 PM

Quote:

Originally Posted by phunk

Never heard of a stock manifold failure. Im sure it will eventually let go if you keep increasing boost pressure.

Your signature says youre running 800ftlb torque.. that is approaching (if not well-in) the danger-zone for VQ headgaskets. You could be an exception. But if you are looking to stay on the safe side of things, I wouldnt be worried about your intake manifold I would be worried about your headgaskets.

700ft/lb at 4550 RPM and mine were done. It appears the higher the RPM the peak TQ is, the lesser of a problem it is.

02-04-2020, 01:07 PM	#1 (permalink)
GeauxTigers1 Track Member Join Date: Nov 2011 Location: Surprise, Az Posts: 590 Drives: 2017 370Z Nismo Rep Power: 6745	AAM Intake Manifold Q Yes I know, there's a ton of info on it and I've read about it. We actually experienced approx 35 hp loss with the manifold so originally took it off and went with the stock intake manifold. HOWEVER, if I'm able to run more boost (20-24lbs) safer, I'd rather go that route and lose the 4% hp. Has anyone actually had issues with their stock manifold cracking or failing? __________________ Fast Intentions Kit Stage 2 #076 2017 Twin Turbo 370z Nismo. JMS Built Block, Closed Deck 874whp, 803lbs Tq e85 Ecutek Tune

02-04-2020, 01:19 PM	#3 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,797 Drives: 2013 Nismo 370z Rep Power: 2684392	Ask Seb what he thinks. Headgasket's start popping at 24psi of boost even if you have a RJM closed deck block and ARP 625's. Not sure how your motor is built but I would be more worried about that. Have you look inside the manifolds runners? You may find some casting flaws that need to be cleaned up. I ran 22 psi sparingly with no issues. GeauxTigers1, Rusty and wideglideleon like this.

02-04-2020, 02:10 PM	#5 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	I am in agreement with Spooler. That manifold is only good if it is ported and polished. You would be better off doing a GTR manifold conversion. Just Spooler pointed out the issue is head gasket problems when you get above 18 psi which is long before the upper manifold becomes an issue. The oem manifold will start to fail at about 25 psi. My two cents, don't fix what's not broke! Sent from my SM-G965U using Tapatalk BOLIO 671, GeauxTigers1, Rusty and 2 others like this. __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

02-04-2020, 02:59 PM	#10 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	Copy that! Sent from my SM-G965U using Tapatalk GeauxTigers1 likes this. __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

02-04-2020, 03:26 PM	#14 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	Never heard of a stock manifold failure. Im sure it will eventually let go if you keep increasing boost pressure. Your signature says youre running 800ftlb torque.. that is approaching (if not well-in) the danger-zone for VQ headgaskets. You could be an exception. But if you are looking to stay on the safe side of things, I wouldnt be worried about your intake manifold I would be worried about your headgaskets. GeauxTigers1, Rusty and Spooler like this. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph Last edited by phunk; 02-04-2020 at 03:42 PM.

02-04-2020, 01:08 PM	#2 (permalink)
nic370 Base Member Join Date: Apr 2015 Location: uk Posts: 187 Drives: 370 Rep Power: 10	. Sent from my SM-G960F using Tapatalk

02-04-2020, 02:24 PM	#7 (permalink)
nic370 Base Member Join Date: Apr 2015 Location: uk Posts: 187 Drives: 370 Rep Power: 10	Sorry to thred hijack what comp ratio are you guys running on your fi builds ? Sent from my SM-G960F using Tapatalk

02-04-2020, 03:00 PM	#12 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,797 Drives: 2013 Nismo 370z Rep Power: 2684392	I wouldn't do a GTR manifold conversion. The runners are too long and will cause issues in the midrange.

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