new top hat mod

[dun4791]

Dan and I put our heads together and came up with this new top hat mod variation.

Click to read more...

 

[Wiked03]

Looks good! Now I know who to call when I wanna get mine done.

 

[Blood on Blood]

Top Hat mod?

 

[WhtSuperStang]

Top Hat mod?

+1

 

[Wiked L]

It has some thing to do with the fuel pump lines on top of the fuel pumps, I think. Lyle can probably explain better.

 

[dun4791]

The biggest restriction (helping to cause high fuel pump duty cycles) on the 03/04 Cobra fuel system is the single 1/4 inch outlet from the 2 stock pumps.
This mod uses 2-3/8 inch outlets, tripling the flow capability. Each pump has its own outlet. The stock setup also has a check valve that should be removed thereby increasing flow capability as well.

 

[FUNDAD]

VERY NICE!!!

Like that mod quite a bit. Pretty damn smart!! Was it tough to do? If you can PM me what it might cost to have that do to my little blue money pit.

Thanks,

Matt

 

[The Pun]

VERY NICE!!!

Like that mod quite a bit. Pretty damn smart!! Was it tough to do? If you can PM me what it might cost to have that do to my little blue money pit.

Thanks,

Matt

+1 - might keep silver car and would like more flow!!!! :biggthump

 

[blubyu]

Would that mod replace / be better than a BAP?

 

[JA$ON]

The biggest restriction (helping to cause high fuel pump duty cycles) on the 03/04 Cobra fuel system is the single 1/4 inch outlet from the 2 stock pumps.
This mod uses 2-3/8 inch outlets, tripling the flow capability. Each pump has its own outlet. The stock setup also has a check valve that should be removed thereby increasing flow capability as well.

Question. You may need to speculate a bit here, but would it be worth it to mod the hat for dual outlets but retain the stock pumps, but have upgraded lines all the way top the rail??

I had plenty of fuel for my Eaton and spray (100 dry shot) last year, but I am going twin screw and may spray as well this year. So I only really need to support maybe 700-750 RW so I think an all out setup like that may be overkill for me. I want to keep it as simple as possible. PM sent too, thanks

Jason

 

[dun4791]

Question. You may need to speculate a bit here, but would it be worth it to mod the hat for dual outlets but retain the stock pumps, but have upgraded lines all the way top the rail??

I had plenty of fuel for my Eaton and spray (100 dry shot) last year, but I am going twin screw and may spray as well this year. So I only really need to support maybe 700-750 RW so I think an all out setup like that may be overkill for me. I want to keep it as simple as possible. PM sent too, thanks

Jason

Jason

Yes it would definately be worth it to mod the hat and keep the stock pumps. I was actually thinking of doing just that as I feel the hat mod like this with stock pumps, will outflow focus pumps without the hat mod. I dont have hard data to back this up, but it is my opinion. But a friend had focus pumps he wanted to sell and since the focus dont draw the amps that the GTs do (FPDMs in series) I can just run one modified FPDM.

You could try the hat mod with stock pumps, BAP with wire upgrade,8 an after the filter to the stock rails. I believe this would be good for your level.
Dont know what you already have, but the expense would be BAP 250, fuel hose 150,mallory filter 100.

 

[dun4791]

Would that mod replace / be better than a BAP?

This will not replace the need for a BAP. This lowers the duty cycle on the pumps. BAP and the hat mod should both be done. the restrictions in the stock hat make me wonder how any fuel gets through.

 

[rocket5979]

Would that mod replace / be better than a BAP?

While my reply could be taken as being slightly subjective due to the nature of the question, yes it will be because your increasing flow which will really decrease fuel_pump_duty_cycle. That means that you are using less of the pumps potential power for the same fuel flow rate.

You Cobra guys are lucky with all these people coming up with ideas for you to use for your fuel issues. I ended up fabricating the entire fuel pump hat for my dual Ford GT pumps from scratch with dual -8AN bulkhead fittings (to dual -8AN fuel lines) because no one makes anything for the Ford Explorers(for obvious reasons). Should flow enough fuel for a crapton of power though!

A BAP will be an easier install but modding the fuel pump hat will be a longer term solution which will in turn give you more range with the stockker pumps.

A BAP and this mod in conjunction with each other is a real winner also because now you have more fuel flow ability per given FPDC percentage and also have much more increased flow from the BAP too.

 

[dun4791]

While my reply could be taken as being slightly subjective due to the nature of the question, yes it will be because your increasing flow which will really decrease fuel_pump_duty_cycle. That means that you are using less of the pumps potential power for the same fuel flow rate.

You Cobra guys are lucky with all these people coming up with ideas for you to use for your fuel issues. I ended up fabricating the entire fuel pump hat for my dual Ford GT pumps from scratch with dual -8AN bulkhead fittings (to dual -8AN fuel lines) because no one makes anything for the Ford Explorers(for obvious reasons). Should flow enough fuel for a crapton of power though!

A BAP will be an easier install but modding the fuel pump hat will be a longer term solution which will in turn give you more range with the stockker pumps.

A BAP and this mod in conjunction with each other is a real winner also because now you have more fuel flow ability per given FPDC percentage and also have much more increased flow from the BAP too.

thank you

 

[Dana]

Question. You may need to speculate a bit here, but would it be worth it to mod the hat for dual outlets but retain the stock pumps, but have upgraded lines all the way top the rail??

I had plenty of fuel for my Eaton and spray (100 dry shot) last year, but I am going twin screw and may spray as well this year. So I only really need to support maybe 700-750 RW so I think an all out setup like that may be overkill for me. I want to keep it as simple as possible. PM sent too, thanks

Jason

Jason,
As Lyle mentioned, we discussed that very situation, retain the stock pumps while doing the remaining mods. I personally would do the Focus pumps anyway, no matter what, if anything, else you do. And especially if you do pull the top hat apart to mod it. They are around $90 each, so cost shouldn't stop you.
Dan

 

[mustangmike2003]

Some one has already done that on mach1registry.com, do a search for CMYLXGO, hes got some crazy stuff done for his returnless fuel system

 

[rocket5979]

Jason,
As Lyle mentioned, we discussed that very situation, retain the stock pumps while doing the remaining mods. I personally would do the Focus pumps anyway, no matter what, if anything, else you do. And especially if you do pull the top hat apart to mod it. They are around $90 each, so cost shouldn't stop you.
Dan

+1. If you already have it apart and are modding the fuel system for more flow then why stop there when all you have is a few more steps to really ensure you won't run into issues down the road WHEN (not if) you decide to go for more power. I don't know about anyone else, but I hate to tear stuff apart twice when I know I can just work on it one time and be done with it.

Also, for the same price as the Foci pumps I would actually recommend the GT pumps as they flow a decent amount more. Just got to make sure you got the hose on the upper barb nice and tight and also switch some of the pump perameters from a GT tune over to your cars tune to make things operate smoothly.

 

[rdsnake]

When you mod the top hat like this, car you still use your factory fuel lines, going from the outlet of the top hat to the fuel filter?

 

[Dana]

No, part of the mod is to increase the diameter of the outlet fitting(s). This necessitates the removal of the stock outlet pipe, not to mention the obvious difference in the type of connection.

 

[rocket5979]

No, part of the mod is to increase the diameter of the outlet fitting(s). This necessitates the removal of the stock outlet pipe, not to mention the obvious difference in the type of connection.

Exactly... Why uncork one restriction to flow just to leave another one existing further up the fuel line? If ya do one ya got to do the other to justify doing the mod at all.

 

[markssvt]

info

Very Helpful Was Thinking Of Doing This Mod

 

[creeper46l]

or try this:
http://www.foreprecisionworks.com/0015-001_page.html

 

[dun4791]

or try this:
http://www.foreprecisionworks.com/0015-001_page.html

Fore didnt have this available when I did the hat mod variation. The hat the way I did it was 30.00 tops. The hat Fore has is very expensive by comparison, but that being said if this was available when I did mine, I would have just bought the Fore one. Quality products from there.........