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Old 07-15-2011, 03:01 PM   #1
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Max revs?

How many rpms can a stock '11 5.0 take safely b4 things start breaking?
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Old 07-15-2011, 03:59 PM   #2
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Your rev limiter will stop rpms before anything breaks. But dont hold it at the max or you'll risk breaking something.
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Old 07-15-2011, 04:06 PM   #3
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Re: Max revs?

max rev and max power are two different things, just because it redlines at 7500rpms does not mean its faster if you go there in each gear.
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Old 07-15-2011, 04:18 PM   #4
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I'm also curious. How safe is it to bump the redline too ~7500-7700, as is common when people install the Boss manifold?
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Old 07-15-2011, 04:26 PM   #5
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Im wondering for the same reason.. Plan on installing a boss intake 7500-7700ish?
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Old 07-15-2011, 04:31 PM   #6
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Re: Max revs?

the boss has different internals and such, not just the intake as well. Not sure how safe it is on the stock bottom end~ good question though. I wonder where the peak power is made at with the intakes.
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Old 07-15-2011, 04:43 PM   #7
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I do plan on it. I wouldn't mind shifting the powerband a bit high. I'm used to the 8500rpm redline in my old Z4 M Coupe. From what I understand the power gained from the Boss manifold is largely above 7000rpm, and at the cost of a bit of low end torque. I wouldn't mind though. The 5.0 has sh*tload of torque compared to the M anyways!
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Old 07-15-2011, 05:28 PM   #8
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Yes I know the boss is completely different in MOST ways from the coyote engine.. Ur gains from the intake should be in the 5750-7500, 7700rpm range I think.. I just wanna know if a 5.0 w factory internals can handle that much safely..
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Old 07-15-2011, 06:33 PM   #9
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I wouldn't do it. Ford found that bumping rpm for the boss intake led to oiling problems with the oil squirters that kept the bottom of the hyperuetic pistons cool. They created block offs for the oil ports and went with heavier forgings to take the heat increase when losing the oil squirters. Heavier pistons along with increased Rpms meant beefing up the rods as well as reducing some weight in the crank. A lot of engineering went into the little bump in rpm to maintain the engine longevity. There was a big writeup on it in 5.0 mustang and fast fords magazine. They did in depth interviews with the ford engineers. I see alot of blown bottom ends down the road for those jus bolting on the new intake and bumping Rpms.
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Old 07-15-2011, 06:40 PM   #10
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Quote:
Originally Posted by guzie
I wouldn't do it. Ford found that bumping rpm for the boss intake led to oiling problems with the oil squirters that kept the bottom of the hyperuetic pistons cool. They created block offs for the oil ports and went with heavier forgings to take the heat increase when losing the oil squirters. Heavier pistons along with increased Rpms meant beefing up the rods as well as reducing some weight in the crank. A lot of engineering went into the little bump in rpm to maintain the engine longevity. There was a big writeup on it in 5.0 mustang and fast fords magazine. They did in depth interviews with the ford engineers. I see alot of blown bottom ends down the road for those jus bolting on the new intake and bumping Rpms.
What about with additional tuning??? You think you could get up to 7400- 7500 safely?
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Old 07-15-2011, 06:47 PM   #11
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Or even 7250 to make it worth the $400 for the intake?
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Old 07-15-2011, 08:54 PM   #12
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Re: Max revs?

Mine revs to 7400 regularly. When I tune for the 80lb injectors it will rev to 7600 regularly. Stock intake stops making power around 6800ish. You will have a slower car if you install a boss intake and shift at 7250.
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Old 07-15-2011, 09:13 PM   #13
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It's not in the tune. You can't tune to get by the oiling issue. Read the article. You may regularly rev past 7000 rpm now but over the long run say bye bye to your bottom end.
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Old 07-15-2011, 09:20 PM   #14
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Re: Max revs?

Quote:
Originally Posted by guzie View Post
You may regularly rev past 7000 rpm now but over the long run say bye bye to your bottom end.
Proof?
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Old 07-15-2011, 09:41 PM   #15
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Read the article. The extra 500 rpms causes several issues. The oil squirters being present causes excessive oil windage issues. The drive pulleys on the motor burn up with continued high revs. They overheat. Ford changed them on the boss. The valve springs had to be changed to keep up with the higher revs too. The clutch pressure plate kept vibrating loose at the higher revs as well. The boss uses nine bolts vs six to attach the clutch pressure plate and not vibrate loose. The timing chain tensioners were also changed to add a pressure relief valve because the 7500 rpm would over pressurize them. The rod bearings don't get enough oil pressure at 7500 with the same oil pump and the oil squirters in place. Ford deleting the oil squirters as I mentioned earlier and increasing oil viscosity use in the boss allowed them to keep enough pressure to reach the rod end bearings. Our coyote blocks bleed off oil to the bottom of the piston and would starve the rod end bearings at 7500 rpm. This is all from Ford interview.
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Old 07-15-2011, 09:59 PM   #16
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Also, I just read another thread on a different forum. Seems like the manifold should still make power even if you shift at 7000rpm. Steeda has the dyno's up on another forum...
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Old 07-15-2011, 10:05 PM   #17
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Got the link to that? I'd like to see it..
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Old 07-15-2011, 10:12 PM   #18
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I had it in print. I found the article online on their site. http://50mustangsuperfords.automotiv...302/index.html
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Old 07-15-2011, 10:24 PM   #19
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It looks like the article online covers it pretty well. I didn't see in it the mention of the clutch vibration or the pulley failure but it was in the full article in the print edition. Look for the august issue of 5.0 mustang and super fords. It has a huge picture of the boss motor on the cover. You can't miss it.
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Old 07-15-2011, 10:51 PM   #20
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Lol I have that one.. I haven't read the whole article yet..
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Old 07-15-2011, 10:53 PM   #21
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Quote:
Originally Posted by Haretakis
Also, I just read another thread on a different forum. Seems like the manifold should still make power even if you shift at 7000rpm. Steeda has the dyno's up on another forum...
Where can I find this?
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Old 07-16-2011, 12:26 AM   #22
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One question though is it gonna hurt it that much if I hit 7500-7700 rpms rarely? I go to the drag strip like 2 or 3 times a year.. 3-5 passes usually.. I don't really let loose on the streets... Had WAY too many tickets when i was younger and now I'm just too paranoid..
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Old 07-16-2011, 12:27 AM   #23
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And I don't hit any tracks cuz there's none anywhere close to here..
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Old 07-16-2011, 01:29 AM   #24
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Re: Max revs?

I know some guys been reving there to 7700 for 6 months and longer no issue. I have put 1300 miles on my car in 2 weeks. A lot of wide open pulls to 7700. No issues. That mean it will last who knows. There has been cars that blew up with nothing but a tune. Modding your car is always a risk. Also ford just released teh TSP to tell every one you mod anything they void warranty.

If you install the boss and do not rev to least 7500 you are wasting money. Also if you have a Boss and have a gear lower then 3.73's again wasting money. As you will not stay in the power band to make the extra power where the stock manifold falls off.
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Old 07-16-2011, 10:50 AM   #25
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Re: Max revs?

I believe that the article says it all. There will be plenty that will have to just 'test the waters', themselves, and suffer the consequences. HOT ROD had a great article, several issues back-regarding all of the "weaker points", in the Ford stock drivetrain(s), including the new Coyote-or 'where' failures were most likely to happen-`very informative..

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Old 07-16-2011, 11:12 AM   #26
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Re: Max revs?

Jim...... You have a link to said article?
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Old 07-16-2011, 11:20 AM   #27
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Re: Max revs?

Quote:
Originally Posted by DDTCM View Post
Jim...... You have a link to said article?
I have the actual copy of the Hot Rod at the house-I am at work-I will get the month of said issue, and post it-tomorrow, or Monday..

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Old 07-16-2011, 11:44 AM   #28
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Re: Max revs?

Thanks
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Old 07-16-2011, 11:46 AM   #29
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http://www.allfordmustangs.com/forum...iscussion.html
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Old 07-16-2011, 06:32 PM   #30
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Re: Max revs?

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Originally Posted by Stupidfast5.0 View Post
You will have a slower car if you install a boss intake and shift at 7250.
proof

beers
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Old 07-16-2011, 08:11 PM   #31
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If you look at the graph posted (as well as the one on AM's site), the manifold clearly makes power even if shifting at 7k. Definitely loses some low/mid range torque, but also gains torque at the end of the curve.
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