Dyno Testing Bolt-ons On The 4.0

[lBasket]

After watching your Windstar video, I immediately began researching making and installing one of my own. Your set up is by far the cleanest I’ve seen. I like the larger 3” diameter and the excellent mounting, especially the aluminum horn at the firewall. Are you considering manufacturing some or all of these parts and selling them individually or as a kit? If not, I wish you would and I’ll be your first customer.

If you piece together a kit of stuff to do it I'd be interested in your PNs or links... You'll probably come up with a nicer looking setup than I would on my own

 

[Steel City 06]

If you're making a kit and clearly you have a plastic printer...why not print the entire Windstar intake piece with all the necessary shorting modifications?

Probably could 3d print the piece that goes into the cowl too.

-Mac

I printed a couple parts for mine.

You'll need a fairly high temperature printer (Chamber 80C, bed 145C, nozzle 315C) because you'll need to print everything in polycarbonate, ideally pure (unblended) polycarbonate. It needs to withstand the worst case underhood temperatures, which can be around boiling point or worse in a select few scenarios.

The Windstar filter housing is simply so cheap and widely available that I didn't bother to print anything else.

 

[Wildman]

If you piece together a kit of stuff to do it I'd be interested in your PNs or links... You'll probably come up with a nicer looking setup than I would on my own

3" Air Intake Induction Mounting Plate Adapter

https://www.amazon.com/Spectre-Performance-8148-Mounting-Plate/dp/B000BPUTL4?tag=wranglerorg-20

https://www.amazon.com/Aluminum-Intake-Induction-Mounting-Adapter/dp/B00HG7D56G/?tag=wranglerorg-20
Air Box if you don't want to use the Windstar one

4"
https://www.spectreperformance.com/accessories/9833-air-filter-housing
5"
https://www.spectreperformance.com/accessories/9832-air-filter-housing

Or you can go full crazy

https://www.spectreperformance.com/9050-spectre-air-intake-kit

Or there is the THOR cowl intake

https://trailheadoffroad.com/product/wrangler-tj-lj-cowl-intake-97-06/

 

[lBasket]

3" Air Intake Induction Mounting Plate Adapter

https://www.amazon.com/Spectre-Performance-8148-Mounting-Plate/dp/B000BPUTL4?tag=wranglerorg-20

https://www.amazon.com/Aluminum-Intake-Induction-Mounting-Adapter/dp/B00HG7D56G/?tag=wranglerorg-20
Air Box if you don't want to use the Windstar one

4"
https://www.spectreperformance.com/accessories/9833-air-filter-housing
5"
https://www.spectreperformance.com/accessories/9832-air-filter-housing

Or you can go full crazy

View attachment 627165

https://www.spectreperformance.com/9050-spectre-air-intake-kit

Or there is the THOR cowl intake

View attachment 627166

https://trailheadoffroad.com/product/wrangler-tj-lj-cowl-intake-97-06/

Dang already on top of it

 

[Rickyd]

If you piece together a kit of stuff to do it I'd be interested in your PNs or links... You'll probably come up with a nicer looking setup than I would on my own

No links but the parts are easy to find. I used a ranger housing that has 3.5" outlet not 4" like the windstar(but is otherwise identical) so you'd get the right elbow for whichever you find. I did mine a bit like nashville and wildman at the firewall

Post in thread 'Project Basketcase!' https://wranglertjforum.com/threads/project-basketcase.67755/post-1649352

 

[Brianj5600]

I am curios about the pressure at the cowl vent at speed. When driving in the rain at highway speeds the rain drops barely move if any. Is there a way to steal 5v to power a map sensor?

 

[Wildman]

Dang already on top of it

You just have to search a little...

I have the 4" inlet plate on mine. And then if you want something other than Black there are places to get other colors in hose/pipe also...

No links but the parts are easy to find. I used a ranger housing that has 3.5" outlet not 4" like the windstar(but is otherwise identical) so you'd get the right elbow for whichever you find. I did mine a bit like nashville and wildman at the firewall

Post in thread 'Project Basketcase!' https://wranglertjforum.com/threads/project-basketcase.67755/post-1649352

I just followed Jeff's idea with a small twist of my own.

 

[astjp2]

It's probably going to melt. I have an aluminum pass thru I made as well that will probably get used long term. I had it on there , but it was making a squeaking noise when the engine moved. I will probably isolate the inside with a strip of door edge trim or something.

MMP gf22 metro moulded products, or something like that

 

[MikeE024]

This is making me wonder , how much of the gain is due to restiction , and how much to cowl air temp ? If you know someone with the typical " CAI " you could borrow for a hour it would be an interesting test.

If I wanted that answer, I’d turn the assembly counter clockwise at the throttle body so it pulls in air from under the hood.

 

[SkylinesSuck]

I am curios about the pressure at the cowl vent at speed. When driving in the rain at highway speeds the rain drops barely move if any. Is there a way to steal 5v to power a map sensor?

I doubt there is much in the way of pressure there. Don't forget there is an opening for the cowl drain directly below that vent opening.

 

[astjp2]

I am curios about the pressure at the cowl vent at speed. When driving in the rain at highway speeds the rain drops barely move if any. Is there a way to steal 5v to power a map sensor?

Boundary layer air is not as good with a flush intake, so probably not much pressure, add an intake that gets above the hood an inch and points forward, lots more air. Look at a p-51 radiator intake, in testing the flush mount flows less air that was the original design.

 

[Jezza]

Boundary layer air is not as good with a flush intake, so probably not much pressure, add an intake that gets above the hood an inch and points forward, lots more air. Look at a p-51 radiator intake, in testing the flush mount flows less air that was the original design.

I wonder though if the angle of the windshield creates a high pressure area at the base of the cowl. I remember reading an article once explaining why cowl hoods are bad for hood venting. The air could actually reverse into the engine bay from the rear and stall air moving through the radiator. That was on a Mustang IIRC. I doubt weather a standard MAP sensor would be sensitive enough to give a reading. A more sensitive sensor would probably be needed and in that case it would most likely be noisy with air turbulence.

 

[macleanflood]

Need a wind turbine and smoke.

Next purchase after that dyno, right?

-Mac

 

[astjp2]

I wonder though if the angle of the windshield creates a high pressure area at the base of the cowl. I remember reading an article once explaining why cowl hoods are bad for hood venting. The air could actually reverse into the engine bay from the rear and stall air moving through the radiator. That was on a Mustang IIRC. I doubt weather a standard MAP sensor would be sensitive enough to give a reading. A more sensitive sensor would probably be needed and in that case it would most likely be noisy with air turbulence.

Anomimeter, probably 2-3” of w.c.

 

[Rickyd]

I wonder though if the angle of the windshield creates a high pressure area at the base of the cowl. I remember reading an article once explaining why cowl hoods are bad for hood venting. The air could actually reverse into the engine bay from the rear and stall air moving through the radiator. That was on a Mustang IIRC. I doubt weather a standard MAP sensor would be sensitive enough to give a reading. A more sensitive sensor would probably be needed and in that case it would most likely be noisy with air turbulence.

A long time ago I had a 72 datsun pickup with a home made cowl hood. Rain would take a u turn and get sucked into the opening

 

[GoldenGorilla]

Need a wind turbine and smoke.

Next purchase after that dyno, right?

-Mac

I don't think any of us wants to see our TJs embarrassed by a wind tunnel.

That said I've read so many discussions on the engine cooling issues people constantly run into with the TJ, one of which I've always wondered about being talk of high pressure building up at highway speed in the engine compartment and seeing my hood float a little on the highway many times, I wouldn't doubt that as a possibility.

 

[macleanflood]

I don't think any of us wants to see our TJs embarrassed by a wind tunnel.

I just want scientific evidence to support installing a tunnel ram on the middle vent of my 97 cowl...

Someone with better AI skills should draw that up...

-Mac

 

[srimes]

I am curios about the pressure at the cowl vent at speed. When driving in the rain at highway speeds the rain drops barely move if any. Is there a way to steal 5v to power a map sensor?

I made a manometer to measure this on my XJ. Just need some clear tubing, a little water, and go for a drive. Then apply math.

Highway speeds where good for .036 psi. I estimated that'd be about 1/2 hp. Decided it wasn't worth messing with.

 

[ColoJeep]

I wonder though if the angle of the windshield creates a high pressure area at the base of the cowl. I remember reading an article once explaining why cowl hoods are bad for hood venting. The air could actually reverse into the engine bay from the rear and stall air moving through the radiator. That was on a Mustang IIRC. I doubt weather a standard MAP sensor would be sensitive enough to give a reading. A more sensitive sensor would probably be needed and in that case it would most likely be noisy with air turbulence.

There is a reason that Chevy made cowl induction for the 70 LS-6 Chevelle. And it only directed air to the engine intake.

 

[xXDavidCXx]

I wonder though if the angle of the windshield creates a high pressure area at the base of the cowl. I remember reading an article once explaining why cowl hoods are bad for hood venting. The air could actually reverse into the engine bay from the rear and stall air moving through the radiator. That was on a Mustang IIRC. I doubt weather a standard MAP sensor would be sensitive enough to give a reading. A more sensitive sensor would probably be needed and in that case it would most likely be noisy with air turbulence.

The cowl is a high pressure area.