[?] '18 Intake Manifold on '15-'17

Edelbrock Tech · Jan 12, 2018

sstone said:
Very interesting, thank you for the info! Curious what the low end would have looked like on the 18 manifold with the IMRCs enabled when compared to the 15 manifold with IMRCs enabled. Makes me think that running the imrc's on the 18 will get you much closer to the F150 numbers below 3000.
Why anyone would want to be turning that few rpms............

The IMRC valves do not really come into play at WOT. In the RPM range we tested, the valves would normally be open anyway. We were also testing other manifolds that do not have the IMRC valves hence why we disabled them on these manifolds.

sstone · Jan 12, 2018

Edelbrock Tech said:
The IMRC valves do not really come into play at WOT. In the RPM range we tested, the valves would normally be open anyway. We were also testing other manifolds that do not have the IMRC valves hence why we disabled them on these manifolds.

I'm just thinking about DDing around town in traffic, but screw it. gas mileage be damned.

EFI · Jan 12, 2018

I read the "top" line was the 18, but what about the HP crossover at 3200? and then at 5100? I assume that the 18 is the one that falls off at 7200 as well.

At 3100 and 5100 it gets close but still think the 18 has it.

At least that's what I can see. Hoping for some better results.

EFI · Jan 12, 2018

Edelbrock Tech said:
We did some manifold testing ourselves recently.

All pulls were done with the same tune to gauge what difference each manifold makes. All runs had the IMRC valves open and disabled.

Stock 2015 GT vs GT350 vs Stock 2018 GT vs Stock 2018 F150

F150 blows them all away until about 5000 rpm. The GT350 was best up top from 6200 rpm and up. The Stock 2015 manifold is a good all around manifold up to about 6500 rpm. The Stock 2018 is the Goldilocks manifold. Not quite as good on torque as the Stock 2015 manifold and not quite as good as the GT350 manifold on the top end, but sits right in the middle of the two.

If 2018 owners are okay with giving up some low end, decent top end gains should be achievable with the right manifold, and with the 10R80, that would be a good match ;)

Do you happen to have the torque curves for those too?

Edelbrock Tech · Jan 12, 2018

EFI said:
Do you happen to have the torque curves for those too?

Not like that at the moment, but I have this graph showing the difference between peak recorded torque.

2015 GT vs GT350 vs 2018 GT vs 2018 F150 peak TQ.jpg

Bluemustang · Jan 12, 2018

I tend to think that the midrange torque does not matter much for racing and WOT. As the MotoIQ test proved, even the stock manifold benefited from revving past 7,000 RPMs and would ultimately result in better times. So it stands to reasons that a higher breathing manifold such as the GT350 or the 18 mani would make a faster car. But if you only care about passing people in daily traffic than the stock 15 or 18 F150 manifold would be better.

Edelbrock Tech · Jan 12, 2018

Bluemustang said:
I tend to think that the midrange torque does not matter much for racing and WOT. As the MotoIQ test proved, even the stock manifold benefited from revving past 7,000 RPMs and would ultimately result in better times. So it stands to reasons that a higher breathing manifold such as the GT350 or the 18 mani would make a faster car. But if you only care about passing people in daily traffic than the stock 15 or 18 F150 manifold would be better.

There's always some trade off with intake manifolds. There is no one fits all solution so you have to consider what the vehicle is intended to do or how you want it to perform, then select the best combination of parts.

We were all very impressed with the idle-5000 RPM performance the F150 manifold delivered. Perfect for a vehicle intended for towing/hauling.

WildHorse · Jan 12, 2018

[MENTION=30288]Edelbrock Tech[/MENTION] Any idea on why the 18 manifold and the 15 manifold crossed over at 4500 rpm then again at 4700 rpm? I know why at 6200 rpm.
Also is the 18 manifold taller? CMCV the same hookups? Thanks.

HISSMAN · Jan 12, 2018

I would wager that the '18 mani would be shorter (shorter runners) in order to breathe as well as it does up top.

Edelbrock Tech · Jan 12, 2018

WildHorse said:
[MENTION=30288]Edelbrock Tech[/MENTION] Any idea on why the 18 manifold and the 15 manifold crossed over at 4500 rpm then again at 4700 rpm? I know why at 6200 rpm.
Also is the 18 manifold taller? CMCV the same hookups? Thanks.

The areas where the curves cross are a result of each manifolds different characteristics at that RPM. Pressure waves run back and forth inside the intake runners. Runner length, cross sectional area and taper rate are a few factors that affect intake manifold performance.

The 2018 GT manifold has 3 IMRC connectors where the 2015 GT uses 4, so not directly compatible there. The EVAP solenoid is also different between 2015 and 2018 so some kind of adaptation will be needed for that. Also, the 2018 GT cylinder head intake ports are larger than on the 2015, so the 2018 GT manifold has larger intake manifold ports to match. 2018 GT manifold runners will have a slight overhang on the 2015 cylinder head ports. As far as height, it is similar to the GT and GT350 manifolds.

Kahboom · Jan 13, 2018

5.0Dave · Jan 13, 2018

18 Manifold Install and tuning

Before I buy i am curious who is tuning these manifolds as of now. And how difficult will it be to install this manifold as well compared to the 350 or the CJ

Cream Puff · Jan 13, 2018

Does anyone have a comparison for the IMRC wiring?

In my conversation with lund the IMRC's function the same from a tune perspective so im curious physically what needs to be changed to hook them up.

If its as simple as the 15 using 4 connectors and the 18 uses 3 so you just remove/tape one off that would be sweet but I have a feeling we're not that lucky.

sstone · Jan 13, 2018

Here's a diagram comparison. 18 manifold is on the left, 16 manifold on the right. Part 9J559 is the imrc control module, 9L492 is the actuators. Purple and blue hoses are the vacuum lines.

Looks like the 18 uses one control module feeding three lines whereas the 16 uses 2 modules feeding 4 lines total (three from one and two from another)? Am I completely off base here in my non-caffeinated/weekend state?

Screen Shot 2018-01-13 at 11.43.05 AM.png

Cream Puff · Jan 13, 2018

Here is some information.. This is the wiring diagram for the 2015 buddy pulled at work.

I only show 2 electrical connections on the diagram, and each being a 3 pin wire.. can anyone confirm?

edit: and google tells me the connector part number is WPT1261 pictured here

[?] '18 Intake Manifold on '15-'17

Edelbrock Tech

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sstone

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EFI

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EFI

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Edelbrock Tech

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Bluemustang

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Edelbrock Tech

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WildHorse

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HISSMAN

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Edelbrock Tech

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Kahboom

Kahboom

5.0Dave

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Cream Puff

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sstone

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Cream Puff

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