"what is low end", indeed.

 

I don't see why you didn't explain your point like this in the first place istead of putting up something you were thinking. This post can add to the thread and that is what I wanted in the first place... go see it, I asked for experiences.

For the rest of the crap you posted what is the need to be a *****? I have never claimed to know exactly what will happen, if you know something I don't why not help us all out and share the knowledge... isn't that what this whole forum(PT.net) is for???

 

I know this, my statement was aimed to be sarcastic so Ranger could elaborate on his statement.

 

As far as I am aware and what I refer to as the "low" end of the RPM band.

 

Here's one of them;
https://www.performancetrucks.net/fo...ferrerid=44477

MPH improves... 60' suffers.

I can't seem to find the rest, maybe it was on one of the other forums... I'll see if I can dig up the others I've seen. I'm not saying it's conclusive just one the ones I was talking about.

 

i just guess every truck is different. some like open exaust like myself and v8's truck. well in sportside's case it didn't like it. humm.

 

Before that night (month ago), I tried it back to back on two
all-motor passes. One thing different was my exhaust system
at the time. It consisted of a gutted 2.5'' y, w/ a 3'' muffler.
The link which gave reference to this thread was done on back
to back passes with a 50 shot of nitrous and true dual, 2.5''
exhaust. (app. 330rwhp)

Anyways, on the back-back all-motor passes, I gained 1mph
and 1 tenth on the SAME 60'. It was 13.9 @ 95 vs. 13.8 @ 96
(app. 270rwhp all-motor).

I think a high flowing exhaust system (LTs, Duals, no cats) in
an appropriate diameter tubing has A LOT of flow potential. If
you mat up a shitty exhaust system and compare times to dual
cut-outs, then the ET/MPH will most definetly drop.

I personally think it would take an unusual setup to gain ET by
a closed exhaust system at lower RPM and gain on the top end
(MPH) due to you opening the cut-outs. Maybe a 230/190 reverse
split cam or somethin.

 

I just can't see how "back pressure" could help an engine make power under any circumstances. However I can understand how exhaust pulses at a certain velocity can "tune" an exhaust system to a certain rpm range. I think the "back pressure" theory is just a matter of people observing something and making assumptions about what is causing it.

 

And that is what exactly I am trying figure out, unfortunately no-one has tried this yet. But from most everyone here so far it seems no losses through their specific experiences.

Either way my exhaust will be completed soon and I will post results of all tests. Because after all I am just trying to get down the track faster in anyway that'll help. And I was hoping for input from you all that can explain any of your own results to the rest of us.

 

I'm not sure I could "win" here, either way. If I'd have posted all that in my first post, I'd have risked people thinking I'm a *****, new guy, who thinks he knows everything.
By just saying I think you have a good theory and thanking some for mentioning the facts about back pressure, you think I'm a *****, anyway.
Not to mention, my experiences do not include cut-outs. Due to this, I didn't feel the need to add them.

Well ...
If you purposely invoke something, why ask why it happened?
Anyway, I wasn't being a *****, so much ... I was laughing, afterall.
But, I do know a thing or two about this stuff and it's difficult to appreciate being told my post is worthless by the guy who freely admits he doesn't know that much about it.
Plus, my "information" had already been mentioned to some degree.
By the way, why didn't you just ask me to elaborate, rather than saying, if I can't show proof, my post is worthless?
Hell, I don't have proof. I did all this research years ago. And I never was one to worry about showing proof about what I know. I just raced.

Yes, that's why we are all here. But, I'm still new here (and I haven't been on LS1.com for a very long time). This leads me back to "looking like a *****."
If all my posts from the old board were still there (I can't find'em), maybe I would have felt a bit more free to "post away." But, they're not.
Oh, and