Higher Redline?

[JakePSD]

So you're telling me I can't spin my 7.3 to 6500+ RPM? :lol:

At least not without probably $100k is machine work...

Sponsored

 

[SolarFlare]

So you're telling me I can't spin my 7.3 to 6500+ RPM? :lol:

At least not without probably $100k is machine work...

What I meant was don't bring your 7.3L logic to a 2015 mustang forum. No it doesn't make power up there without a manifold swap. It's been known in this forum for 2 years. If you want to run a manifold tune with a stock manifold go right ahead, good luck picking up your engine parts off the road.

If it gives you closure.....from my brief looks at my datalogs I don't see a drop in timing up stop, it stays steady til the shift point.

 

[JakePSD]

What I meant was don't bring your 7.3L logic to a 2015 mustang forum. No it doesn't make power up there without a manifold swap. It's been known in this forum for 2 years. If you want to run a manifold tune with a stock manifold go right ahead, good luck picking up your engine parts off the road.

If it gives you closure.....from my brief looks at my datalogs I don't see a drop in timing up stop, it stays steady til the shift point.

I'm not trying to bring 7.3 specific logic here, I realize they are totally different animals, but don't knock me for trying to learn new things and expand off of the knowledge I do have. It's what I know, and I'm trying to learn new things based off of that. Just like multiplication is a totally different beast than simple addition, but similar concepts apply, hence why in school you learn addition, then multiplication, you build off what what you have. I realize that one is a low revving work horse truck engine meant to pull heavy stuff over long distances, and relatively speaking is a dinosaur technologically, whereas the other is a high tech, high revving, basically race engine meant to propel a small car at high speeds. However they are both computer controlled engines, so some of the same type of programming ideas may be similar, such as beginning to limit fuel/spark/cam timing etc before the actual hard limiter. All I was doing is trying to throw a different idea into the mix, maybe something that not many people have thought of. Long stretch but things like that can happen. There has been numerous times that I have been stumped wrenching on a vehicle (my hobby that I've been doing for 14 years, so I'm pretty experienced) and someone like my girlfriend points out something or has an idea that is so simple that for some reason I never thought of that helps or even fixes the problem.

A tune for that manifold will scatter the engine?

I'm not talking just a drop in timing, I'm talking everything, spark, cam timing, fueling, etc. And you say, "til the shift point." Are we talking shift point of 6500 in stock cars or what? I guess what I'm saying, is that if we alter the stock tune to work with stock parts, but raise the rev ceiling to say 8000, and adjust fuel, timing, etc. accordingly, would the drop off in power right after 6500 be as bad?

 

[SolarFlare]

Change all you want, the manifold can't supply the car with the air it needs at or above 7000.

 

[Terminator2]

I know this is an old thread, but I have a point to bring up regarding power drop off after 6500 RPM. Has anyone ever ran a higher RPM tune (such as the one for the boss manifold) with a stock manifold? How do we know that the manifold itself is actually what is causing the drop off in power rather than factory tuning? I'm no expert in tuning but I do know from talking to the guy that did a live tune on my 7.3L Power Stroke that factory tuning actually starts cutting power a bit before the actual rev limiter. It isn't full fuel until 3500 RPM (in the case of my 7.3) then *bam* rev limit, it actually starts a gradual cut out a couple hundred RPM before the hard one.

It's mostly the manifold it has fairly long intake runners Tuning helps a little as does a very free flowing intake tube and filter. Stock Soft limiter is 6850 and full cut is 7000 so 150 rpms there. Power peaks at 6500 and drops pretty hard after that. First mod I did was a tune and it definitely woke the car it.
My car as it sits with 1 7/8" long tubes, no cats, straight through mufflers, a Pmas intake and my own custom tune with a 7500 rpm limiter pulls noticeably harder than stock up top especially from 6500-7400 (my shifts are made around 7300-7400 now) but honestly most of that is the big primary LTHs and extremely free flowing 5" Pmas intake my tune made a bigger difference in low to mid power and drivablity. It still doesn't quite have the top end that my 13GT had with a boss 302 manifold.

 

[JakePSD]

Well that answer is all I was really looking for, but with some data to back it up. I'm sure it's out there, I just don't have the time or ambition to search for hours to find information on something I have no immediate plans to do.

 

[JakePSD]

It's mostly the manifold it has fairly long intake runners Tuning helps a little as does a very free flowing intake tube and filter. Stock Soft limiter is 6850 and full cut is 7000 so 150 rpms there. Power peaks at 6500 and drops pretty hard after that. First mod I did was a tune and it definitely woke the car it.
My car as it sits with 1 7/8" long tubes, no cats, straight through mufflers, a Pmas intake and my own custom tune with a 7500 rpm limiter pulls noticeably harder than stock up top especially from 6500-7400 (my shifts are made around 7300-7400 now) but honestly most of that is the big primary LTHs and extremely free flowing 5" Pmas intake my tune made a bigger difference in low to mid power and drivablity. It still doesn't quite have the top end that my 13GT had with a boss 302 manifold.

So basically you are saying that my line of thinking is somewhat correct? That the manifold only itself is not the whole reason that power drops off dramatically after 6500? That the tuning does play a role in that?

What I'm getting at is that sure, maybe the manifold is restrictive above 6500, and does cause power loss, but is that the ENTIRE reason for the power loss, or is the tuning part of it? Sorry if I sound somewhat repetitive, just trying to convey my point with zero doubt as to what I mean.

 

[Terminator2]

So basically you are saying that my line of thinking is somewhat correct? That the manifold only itself is not the whole reason that power drops off dramatically after 6500? That the tuning does play a role in that?

What I'm getting at is that sure, maybe the manifold is restrictive above 6500, and does cause power loss, but is that the ENTIRE reason for the power loss, or is the tuning part of it? Sorry if I sound somewhat repetitive, just trying to convey my point with zero doubt as to what I mean.

You are somewhat correct as a very free flowing exhaust, intake tube and filter and some tuning changes absolutely make a difference in top end power from 6500-7400 with the stock manifold but stock manifold doesn't compare to a GT350, Boss 302 or Cobra Jet manifold for power above 7000. Unfortunately it's just the flow dynamics of a longer runner manifold with a smaller plenum volume vs a shorter runner intake manifold with a larger plenum volume.

 

[SolarFlare]

We still beating the horse? "I don't feel like researching anything, just tell me I'm 39.5% correct."

There's a dyno sticky at the top of this section, shouldn't take more than an hour to go through it and look at different dyno sheets with different mods.

 

[VTECSAUCE]

We still beating the horse? "I don't feel like researching anything, just tell me I'm 39.5% correct."

There's a dyno sticky at the top of this section, shouldn't take more than an hour to go through it and look at different dyno sheets with different mods.

What I meant was don't bring your 7.3L logic to a 2015 mustang forum. No it doesn't make power up there without a manifold swap. It's been known in this forum for 2 years. If you want to run a manifold tune with a stock manifold go right ahead, good luck picking up your engine parts off the road.

If it gives you closure.....from my brief looks at my datalogs I don't see a drop in timing up stop, it stays steady til the shift point.

Wait what...a stock manifold makes your engine blow up at 7500? LMFAO! Guy immediately gets on here to bash then makes up his own facts. 7500 RPM will not benefit a stock manifold what-so-ever, but your engine wont blow up from it. In the time you wasted bashing the guy and repeatedly telling him to do research, you could have just answered his questions. Do everyone a favor and get off the forums if you're gonna bash and be completely unhelpful. :headbonk:

 

[SolarFlare]

Wait what...a stock manifold makes your engine blow up at 7500? LMFAO! Guy immediately gets on here to bash then makes up his own facts. 7500 RPM will not benefit a stock manifold what-so-ever, but your engine wont blow up from it. In the time you wasted bashing the guy and repeatedly telling him to do research, you could have just answered his questions. Do everyone a favor and get off the forums if you're gonna bash and be completely unhelpful. :headbonk:

Congrats, you win at picking a few words out of several posts to try to make a point which really has nothing to do with what I said. And bashing? A little thin skin if you think any of that was bashing.

 

[VTECSAUCE]

Congrats, you win at picking a few words out of several posts to try to make a point which really has nothing to do with what I said. And bashing? A little thin skin if you think any of that was bashing.

Telling the guy to take an hour to look through a post for his answer rather than take less time than it took for you to type up numerous unhelpful posts was just incredibly inefficient. You must be having a bad day to be willing to waste it here providing nothing constructive. Hope it gets better friend :cheers:

 

[SolarFlare]

Telling the guy to take an hour to look through a post for his answer rather than take less time than it took for you to type up numerous unhelpful posts was just incredibly inefficient. You must be having a bad day to be willing to waste it here providing nothing constructive. Hope it gets better friend :cheers:

Fella revives a 1.5 year old thread talking about if running a tune for a coyote with an aftermarket manifold will allow him make power past 7k rpm but yet claims "I just don't have the time or ambition to search for hours to find information on something I have no immediate plans to do." Im pretty sure everyone that answered said no and he kept at it. At this point Im wondering if I should contact Lund about a GT350 manifold tune for my car. This just might work.

And just incase you don't know how to find your way around forum pages, he's my answer to his original post. I answered it, so move on and enjoy your super fabulous day, Sandy.

"Holy thread revival batman!!

Look at all the stock/bolt on dynos you can find, makes no difference, power drops after 67-6800. It is what it is. mustangs aren't a 7.3L diesel, you want to make power at 7500rpm? Swap manifold."

 

[D3adch1ld]

Well that answer is all I was really looking for, but with some data to back it up. I'm sure it's out there, I just don't have the time or ambition to search for hours to find information on something I have no immediate plans to do.

Unfortunately, every body is right. The manifold is just not efficient beyond 6.8k, while Yes you can push it further, it feels unnatural to the rngine and out of breath with several different tunes. Once I swapped to the GT350 intake it was very obvious... the car pulled like there was not end. So I got ambitious and went for a 8k Redline... perfect combo there. Now with the procharger on top of it, I wish I could push it to 9k, lol. Not chancing an engine tho.

 

[JakePSD]

SolarFlare

I was just looking for some knowledge on these cars, and if I can get a quick answer in minutes by just asking rather than searching for hours, why not? Are you one of those "use the search" Nazis? I've never understood people like that. What the hell is the point of logging into the forum if all you are gonna do is tell people to use the search? Just do everyone a favor and not even log in. Or better yet, just answer people's questions. Or if you insist on logging in and if answering a question that has already been answered bothers you that much, just don't even reply. Close the thread and move on. No need to be a dick. And if telling people to use the search is going to be your main course of action to questions, it could be done FAR more tactfully. I agree with vtechsauce, why waste your time making all those posts when finding the threads yourself and posting links here would have taken less time. I can understand telling people to use the search when it is a basic question that has an easy answer. However something more specific like what I was asking isn't a 5 minute search kinda thing, but could be a 5 minute ask someone who knows and they answer. Searching might take an hour or more. I don't know about you but I have far better things to do with my time.

And really, who cares how old the thread is? Plus don't you think that me bringing up an old thread is kind of a clear indication that I WAS USING THE SEARCH? Back off of people or GTFO. It's a good thing that this wasn't my first posting on this forum. If it was it'd be pretty easy from the first impression for one to assume that this place is full of assholes that don't want to help people, then found a different forum and never come back to this one. Perhaps you are ok with that though?

Or maybe you were just having a bad day and I happened to be the poor soul that took the brunt of it. Maybe one day we will end up drinking beer together and laughing about your assholish first impression. Maybe you are a helpful member here and a cool guy. I don't know. But if any of this paragraph is true, then really dude, work on that attitude you gave me.

Sponsored