if you guys think that we are slow now... you wouldnt want me to stop using the phone while driving LOL... i would end up stuck talking to people the entire time i am at the shop!

 

Attached is my screenshot of my data log for reference. This is with O2 correction off. I followed the steps as outlined before and from I see do not exhibit the same issue. The AF is a bit fat since i'm still breaking in the engine. it will be interesting to see if my situation changes after the fuel pump installation and swirl jet mod.

I cannot upload the actual log as the file is too large

 

Hmm, a quick datalog like that shouldn't be too terribly large.

also, click on the a/f bar so the units on the left are a/f and not rpm. That will make it easier to see what the a/f level is as the rpms go up.

 

the log is 400k probably due to the number of channels logged. here it is with AF highlighted

 

wow, that's a pretty low a/f ratio for just a light vac cruise eh?

 

yes it is. it was only a quick road retune when the new built engine has gone in. only done 500 miles. Point is though i do not see the spikes.

 

ya, I have the spikes and they are 18:1 a/f no matter how much fuel i dump into those load cells. It's a pretty nasty buck when i hit those areas too.

 

^^ exactly... people do not need to seek out of investigate this issue. if you have it... YOU KNOW... it is clear and simple. there is just a complete DEAD SPOT. You would know it literally within 30 seconds of driving the car.

 

Allow me to correct myself. The previously posted "2 damper" graph did actually have O2 control turned off. But I did have some logs with O2 correction turned ON - see attached for a more "apples to apples" comparison before and after the third damper was installed.

 

And here is an apples to apples comparison of 2 dampers vs. 3 dampers with O2 correction turned OFF.

 

update; SO... we had the cad work all done to put the dampers in the only spot that our rail billets can really mount them ideally. before machining, brandon elected to double check fitment with the intake manifold bolted to the lower runner section... and sure enough there was a confliction. I guess we forgot that the stock lower intake manifold section has these massive excess chunks. they could be grinded off for clearance, but we dont want every single person who buys our rails to have to spend 90 min grinding material off the plenum.

so we started on the solution. which is a completely seperate damper housing that will now bolt to the rail. the damper will still be less than 1 inch off the main rail bore between 2 injectors on each rail. the seperate component allows us to hang the damper in a position that is outside the boundries of the billet we machine our rails out of. unfortunately, it will still require updated rails that have our damper housing flange integrated into them.

so, this extra step is going to push us back another 7-10 days. CAD work on the housing is complete, we have to do the new CAD for the rails but shouldnt be too bad.

 

which dampers are you building around? the HR ones?

 

^ yup HR dampers. they visually appear to be identical to VHR ones although I havent measured the dimensions. for the HR, they use a very different style bracket to hold them down than the VHR. neither of which matter, we are using a snap ring.

 

will they be included with the rails or should we buy them now from Nissan to avoid any back order problems?

http://www.courtesyparts.com/22675ma...4_715_729_731&

 

Dont order them just yet! I want to see this stuff bolted to my engine first!

 

machining the damper housings tomorrow night. test fit the dimensions on my car etc and looks like its going to be good. so as soon as the housings are done, which is hopefully all tomorrow, we can double check clearance and machine rails with the matching flange.

 

Can't wait

 

finished 28 damper housings over the weekend. working on the rails with the mating flange now.

 

do you have a price for the full set up.... set up'ed?

 

you mean the rails with dampers, or an entire fuel system?

either way, pricing hasnt been updated yet until we finish these rails and figure in the price of the dampers etc. all pending orders for fuel systems will get the new rails at no additional cost... but all the extra parts and expense of the dampers will be reflected in the updated price. for now, we will not take any orders for rails or systems until its all done.