Which Engine for My Turbo Project?
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Senior Member
Joined: Aug 2001
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From: Western New York
Which Engine for My Turbo Project?
I just purchased a project truck, 1998 F150 Regular Cab Flareside 2WD 4.6L with 125K miles on it - it's in perfect condition even with the high miles and age - like me!
Well, I'm not sure if I should replace the engine with a built 5.4L 4V with a built 4R100 transmission with twin T61 turbos - goal is ~800-900 RWHP or go with a built Cobra 4.6 4V with a built 4R70 transmission with twin turbos; This project is for street and strip use.
I'm concerned with engine weight, I might look at going with an aluminum block. I'm also concerned with space under the hood. There are Mustangs running twin turbos out there, but I'm also concerned with torque/hp comparisions between the 4.6 and the 5.4. Any comments would be much appreciated - thanks!
Well, I'm not sure if I should replace the engine with a built 5.4L 4V with a built 4R100 transmission with twin T61 turbos - goal is ~800-900 RWHP or go with a built Cobra 4.6 4V with a built 4R70 transmission with twin turbos; This project is for street and strip use.
I'm concerned with engine weight, I might look at going with an aluminum block. I'm also concerned with space under the hood. There are Mustangs running twin turbos out there, but I'm also concerned with torque/hp comparisions between the 4.6 and the 5.4. Any comments would be much appreciated - thanks!
Thread Starter
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Senior Member
Joined: Aug 2001
Posts: 283
Likes: 0
From: Western New York
Thanks for the replies; I want to make sure I don't go down a deadend road with this project. I want to keep costs down by doing most, if not all the work myself. I've learned a ton from this forum and want to give back what I learn from this project piece by piece. I plan on starting with designing the system that will produce the power and reliability I'm looking for. I've worked as a design drafter for years in the industrial and aerospace industries; primarily in hyrdaulic actuation systems for flight controls. Measure twice and cut once is what this forum and others have taught me - thanks guys. 
Last edited by BruceScrew; Aug 3, 2005 at 11:29 PM.
Senior Member
Joined: Jan 2002
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From: Oklahoma
Considering whats available NOW ONLY - built 5.4 4v/built 4R100/twin turbos (may want a smaller one for faster spool up and larger for mid/top end?)
Considering what is available NOW and in the FUTURE and COST and difficulty level - built 5.4 2v/built 4R100 AND have a choice NOW of a roots M112, 2.3 twinscrew, several centrifugal kits, single turbo kit, custom twin turbos AND in the FUTURE have a choice of a monster 3.3 twinscrew.
Good Luck!
Considering what is available NOW and in the FUTURE and COST and difficulty level - built 5.4 2v/built 4R100 AND have a choice NOW of a roots M112, 2.3 twinscrew, several centrifugal kits, single turbo kit, custom twin turbos AND in the FUTURE have a choice of a monster 3.3 twinscrew.
Good Luck!
Last edited by iron horse; Aug 8, 2005 at 02:33 AM.