LS series Semi factory big power fuel setup...

[skinnies]

First off LOL

Between my rx7, ltd, friends cars, and customers cars, we 've proven MANY times this fuel setup works fine at 800+ rwhp, 900+ on several of those. We've got LOTS of logged street miles, lots of wot pulls, never an issue with this setup.  This is on e85 also, which requires A LOT more fuel!

Is it the best way to do it, NO, does it work fine at sub 950rwhp ON E85, YES! That is the problem with the internet, too many KNOW IT ALLS, who don't have actual PROOF of what works or doesn't. Great example here and also can get on ls1tech's fuel section and read vendors selling of fuel LINE and RAIL upgrades for guys wanting 650rwhp, when both will work fine at 900+ rwhp on e85.

Don't say it's gonna torch a piston when you don't know what you are talking about, plain and simple you are just making yourself look bad.

[mefarri]

The point Blake is trying to make is, for very little extra cash outlay, you can remove a potential engine destroying condition from POSSIBLY happening.  With all the shit that can go wrong, why leave one door cracked a little for the possibility of something happening?  Budget build?  Sure I guess.  David's car isn't so not taking the extra precaution comes off as short sighted.

 An example, zbrown had an issue with a radiator hose blowing off under boost, so he swapped to AN hoses.  I, not wanting to imitate that POTENTIALLY later, went ahead and got AN hoses on the front end.  Now, would normal hoses and clamps work?  Sure.  Do they also leave the door open for potentially causing a high speed skating rink for my car?  Yep.

[dream36realms]

mine is set up almost exactly like the OP picture. When I asked if I should do the reg before or after the rail I was told by members here to go with whatever I wanted as both would be fine for mypower goals. With that said since I was using the stock fuel rail I was limited to the only option of regulating before the rail. While this is not the most efficient way of doing it, it is perfectly fine this way.

I am failing to see what the argument is in this thread though. I see the points being made but it almost seems that some guys are satign the same thigns but using diferent wording. If you dont want to buy new rails to accomodate the regulator after them than run the reg before. that in my opinion is a simple sollution here. Just be sure to clamp the rails down real good and use the correct fitting to avoid a disaster themn enjoy.

However, I do carry a fire extinguisher everywhere I go in the seven now Just In Case!

[digitalsolo]

Thank you Matt.

Again, I'm not saying that if you run stock rails, your car will blow up.   I'm saying that it is a less optimal layout than doing a regulator after the rails.   I don't think anyone disagrees with that.   At the point where you have AN lines and an aftermarket regulator, it's very cheap to put in aftermarket rails and configure it that way.   Considering that it buys you a little more headroom in the case of any other issues (especially the marginal fuel setups many people run), it seems silly to me to not spend the money.   Some people disagree and want to save a buck there, fine, that's your prerogative, and odds are, you'll be fine.

Perhaps I didn't do a good job of making this clear.   Or perhaps people just don't bother to read.    I don't understand why people are so emotional about defending their fucking fuel setups though.   Then again, I'm just a know-it-all who has no idea what he's talking about, so.

[mefarri]

  

[DavidPHumes]

Thank you Matt.

Again, I'm not saying that if you run stock rails, your car will blow up.   I'm saying that it is a less optimal layout than doing a regulator after the rails.   I don't think anyone disagrees with that.   At the point where you have AN lines and an aftermarket regulator, it's very cheap to put in aftermarket rails and configure it that way.   Considering that it buys you a little more headroom in the case of any other issues (especially the marginal fuel setups many people run), it seems silly to me to not spend the money.   Some people disagree and want to save a buck there, fine, that's your prerogative, and odds are, you'll be fine.

Perhaps I didn't do a good job of making this clear.   Or perhaps people just don't bother to read.    I don't understand why people are so emotional about defending their fucking fuel setups though.   Then again, I'm just a know-it-all who has no idea what he's talking about, so.

I fully agree with this. If I could do mine again it wouldn't be this way, but alas, what's done is done.

[Ruler_Mark]

thanks for making me even more indecisive on how to route my fuel system. 

[mefarri]

Just do what I said and reduce line size as appropriate and you'll be just fine.

[Ruler_Mark]

If only it was that easy 

[twokrx7]

Good discussion of opinions here.

Critique without data begets emotion, is it tough for analytical decision makers to understand this?  If we had some high frequency logs of pressure in both rails under specific test conditions or better yet measured fuel flow at each injector that suggested the factory rails are prone to issues above some hp/flow/etc, then, the "data" would be discussed instead of the critique being critiqued.  I might even settle for cylinder to cylinder EGTs, something besides speculation.

All of this discussion about which setup is better is pure speculation until someone produces the meaningful data under documented conditions to prove it.  If one claims this or that motor failed because of the stock fuel rail, or the regulator was before not after ... without data it is simply speculation and at best some form of "judgement" (engineering judgement if stated by proven individual that had "some" related data that could be applied/extrapolated/etc).  So, unless one has the engineering data to back up their claims, they cannot justify the statement that the aftermarket rail is better or moving the regulator after the rail is better etc.  They may feel it is better, but their feelings, perceptions, and speculations are of limitied value to folks that do not value their opinions. 

We can critique any setup and identify possible issues and flaws relative to another, no setup here is perfect or even proven optimal, but alot of them work damn well so let's chill out and have a cold one