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Old 03-29-2010, 10:45 PM   #1
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Default How much is too much boost for a 4.6?

How much boost is too much for a 4.6 with stock internals? I'd like to eek out a few more horses and I've found a place that sells a pulley that would increase me from 11 to 12 lbs. but I'm concerned it would be too much. Anyone have any good info on this?
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Old 03-29-2010, 11:24 PM   #2
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if your talking about your GT500 u have a 5.4L and it will take very easily an increase in boost.

and if ur not talking about a gt500 then a GT 4.6L wont take much more than mid 400s MAYBE
a 03/04 cobra 4.6L will take 700+ with the right power adder and tune
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Old 03-30-2010, 12:40 AM   #3
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I'm making 484 right now at the wheels with 11 lbs. So I suppose I should just be happy with what I have right now. Its a 4.6 GT, 2007.
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Old 03-30-2010, 08:29 AM   #4
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so ur talking about a 3valve? hmmm lets let elky chime in he will know a lil better... but as far as im aware ur reaching its limit. stock shortblock?
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Old 03-30-2010, 02:04 PM   #5
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Yeah, engines stock top to bottom aside from the supercharger kit. The kit included 32 lb. injectors and a cobra fuel pump if I remember correctly. Wish I could say I know more but I bought it used with the supercharger already installed.
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Old 04-01-2010, 10:25 PM   #6
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32lbs injectors wont take you to 484wwhp my friend.Happy dyno or someone elses numbers.Most blower kits come with a min of 39s to 42lbs injectors,39s will be blue pin style injectors with a ev6 plug,42s will be green top fat bocsh style.Both will support close to 500whp with big fuel pumps.

3vs as long as the tune is solid and you have fuel system will live at 500 to 520 max on a blower.
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its just won't max out the injector when you punch it the a/f ratio stays stoich. with the other tune it runs more rich
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Old 04-01-2010, 10:26 PM   #7
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what blower is on the car?
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its just won't max out the injector when you punch it the a/f ratio stays stoich. with the other tune it runs more rich
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Old 04-02-2010, 12:17 AM   #8
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W140ax Whipple

38lb. injectors

Here's a link to the kit, those numbers are my cars numbers. http://www.whipplesuperchargers.com/...sp?ProdID=1208

It's the HO with intercooler and the pulley is 3.375" which Lethal Performance says is good for 10-11lbs boost. Aside from FRPP GT mufflers it seems stock. I bought the car used and its got about 36k miles on it.
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Old 04-02-2010, 06:31 PM   #9
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we can ad a lbs or two and retune it,most of the time there good for 500 to 520 whp max.Lmk im a whipple dealer and registered sct tuner and dynojet dyno shop.And i own my own 3v and 850whp cobra.We know mustangs.
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its just won't max out the injector when you punch it the a/f ratio stays stoich. with the other tune it runs more rich
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Old 04-02-2010, 06:41 PM   #10
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How much to swap in a 5speed in an aod equiped fox
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