That looks pretty conclusive. Congrats mx594.

Charles whenever you get an upgrade package worked out for your kit, please reserve one for me. Even though I can manage without it, I'd just as soon make retuning easier for the future...

 

Some pictures of my setup. Luckily I had a spare adapter made which I was able to use as a feed/damper mount. Then I cut the stock 8 mm hard line and flared it for -5 AN fittings. Then I bent and flared some 5/16" SS tubing to connect the the adapter.

 

Congrats man!

 

rc-

Tuning the vacuum columns just got REAL easy. I am still in shock.

I started re-tuning tonight with higher latency numbers, which I am proud to say has allowed me to get my cruise control working again and not have a backfire on decel! For the full story, see this thread:

https://my350z.com/forum/tuning/4981...ransition.html

But the bottom line is yes, tuning the high vacuum columns is a piece of cake now.

 

We drilled the rails over the weekend, so they are ready for machining. Within the next couple days we will decide on the final location of the damper and start machining the rails. im hoping to have them done about this time next week.

 

awesome.. well done.

I'm still perplexed though. Take my setup for instance located here https://my350z.com/forum/forced-indu...rfs-setup.html I don't *believe* I have the same issue. I will need to data log again to be sure but I do not get the stutter/hesitation like you experience. The real differences between ours are the rails, injectors and pump where mine has the cosworth rails, ID725 injectors, 165 lph pump out of the stagea and the swirl jet has not been enlarged.

With the 2 graphs above was closed loop on for both as one has O2 correction listed and one does not.

I will data log mine and post and what would be interesting is if i don't have the issue now but after an upgrade to the DW300 and swirl jet the problem appears.

 

i dont believe anyone has found much rhyme or reason why some of the cars have issues pronounced enough to notice, while most cars do not. heck, my car didnt for years, and then started at some point later where i dont recall even changing anything in the fuel system. my car has had our stage 2 kit since like 2004. it was a few years later that i started noticing a problem. i built custom plumbing to go with the billet intake manifold, and added the twin pump and associated plumbing and it had no effect at all.

but from this point on, after our first batch of dampened DE rails is done, we will now be retaining all OEM dampers in future products and possibly adding more for some! its just not worth having to mess with!

 

mx, nice job taking care of business... its absolutely wild that you had to go to the extent of having more dampers than stock.

 

Both of those plots have O2 correction turned ON. Yes, it was that bad even with individual bank O2 correction.

Keep in mind that even with bank 1 running that lean its still hard to feel when driving becuase it is at such low loads and it was only on the one bank. At higher loads it wasn't a problem. With the 2 damper setup, the car was very much driveable but not quite "stock" feeling. With the three damper setup, it is just beautiful. I would definitely say that *most* people would be very happy with the 2 damper setup - especially if they only had one wideband on bank 2

 

Find a nice flat road or better yet slightly downhill.

Accelerate from 1000 to 4000 rpm in 4th gear, while keeping the engine below 16 in-hg.

Probably should turn O2 control off to get the best picture.

Post results.

 

awesome!!

so now you have 3 dampers? cant see pics at work. 1 before the rails and 1 after each rail?

mmm maybe I shouldnt have sold my haltech so quick... LOL

 

^^^ lol, I kept nagging John at HKS to let me send in my fcon for inspection.

 

MX nice work on getting your issue resolved

I can wait for Charles to start pushing his first batch out
I got a bad lean spot in the same area I can't seem to tune out no
matter how much fuel I add.

Charles when do you think the first batch will be available for order?
Would it be a additional piece or would the entire rail need to swapped out for new style?

 

^^get in line buddy, no cutting LOL!

 

I'm now interested... like Charles mentioned, I've been trouble free for several years and now a couple months ago I start seeing lean spikes. They usually occur 'near' 2400 rpm but it's not all the time and it's not always exactly 2400rpm... anywhere from 2200 - 3200 I'd say. I can feel during light acceleration it as a slight hesitation and the A/F pegs the upper end of the gauge for a split second. Never happens during medium/heavy load...just very light loads.

So now my question -- for those of us with stock rails (stage 1 fuel system ect) still use these with the dampers or do we need to upgrade the rails and all?

 

To add dampers to the factory rail for Stage 0 or Basic RFS', I would contact MX, he has a CAD program and local machinist to build the components. We will eventually get to that, but we are focused on just the DE rails for the time being.

For those already running billet rails with the DE kits... what we are making now are complete replacement rails. There was no good way to add dampers to them that we could come up with.

Glex25; first batch should be available some time next week at the current rate. We are making a dozen pairs for now so we can get some feedback. I think 5 sets are already spoken for in backordered fuel systems.

 

Would this issue even be prevalent with a Stage 0 setup and stock rails? I'm currently using a Stage 0 w/ stock rails and you are basically using all of the stock dampers except for the one that gets removed for the fuel return line...

BTW, no problems with my setup, but I'm only running a measly 550whp...

 

if youre not having any issues, then there is no reason to fix what isnt broke! most people dont have this issue. it seems there have been cases with all different configurations.

 

Put me in for one of the 7 sets that are not spoken for.

Is there a exchange program for the old ones?

Give me mine in Anodized blue if possible

 

Dude, go back and read the first post.