I think Mitch let her win... It is in his best interest to let her win. :p

Havent posted in here in awhile but I do still have the Z infact we opened up our own tuning shop complete with a Dynodynamics 2wd dyno. We got signed up to be a tuner for ECUTek and I spent the last 2 days tuning my personal Z with it. Got the fuel dialed in and started to slowly crank it up then ran into the same stupid issues I been having for quite some time now, the fuel pressure would drop significantly when laying into it.

I pulled the fuel assembly out last year and found an oring leaking, I thought I had it fixed but I am guessing I blew through another one. Ran out of time today to pull the pump out the of the car but did manage to snap a pretty neat picture of how it currently sits.

http://img.photobucket.com/albums/v2...ps2otbaibo.jpg

I been told that DD dynos read low, but I am looking to try and see how much I can push out of her with the fuel we have around here. Also after running the innovative SCG-1 I think I am ready to sell it, I miss the features my EVC had and the ability to have more control over the boost. I am also going to see about getting my factory ECM to handle the boost via ECUtek, curious to see how that will work. :D

http://img.photobucket.com/albums/v2...psbtghtrzk.png

Congrats on the dyno and shop!

Boo to the fuel issue. Keep us posted on that.

Dyno party at Mitch's place this summer.. :stirthepot:

You know it!

Does Sasha have a solution for the low fuel pressure?
If not, I have a theory and possible solution.

Congratulations on the new dyno/shop and I look forward to your success stories

Its an issue with the factory setup in the tank. I have a sneaking suspicion that the return fuel system in the car is heating up the fuel so much that it starts to cavitate. I am going to pull out the pump and check for leaks internally (I had that issue last year) it is possible that it blew out another oring. It seems to be directly correlated to how heat soaked the car is.

Cold day (semi cold engine) and its perfectly fine, as it heats up it gets worse and worse to the point where it cant even make regulator pressure at idle.

If its cavitation it might be because of the stock filter attached to the bottom of the 255 pump, maybe there is just not enough flow there and when the temp increases the fuel increases its tendency to cavitate. It probably doesnt help that the return is so close to the pickup so that that hot fuel just makes laps getting hotter and hotter.

Just a few ideas I had over the year or so, ill start with the simplest and check for leaks as I did find one last year and replaced the oring. Might have to turn down the pressure incase that is what is causing it. If I cant find a leak then im not quite sure, might try running it without the factory screen in the tank and see what happens, if it helps ill install a inline filter and call it good.

:tup:

One of the big issues on a return system is heat and the lack of volume in the stock pumps cavity. The internal filter takes up too much room. Plus over time the filter does get less efficient and flows less (minor)

A external filter is a good idea but still doesn't solve the volume issue. I've seen stock pumps casings with the internal filter removed and that may solve the volume issue.

Those are my thoughts anyways

I think that is what I am fighting, the odd part is why am I the only one really having this issue. I am not the only on running a return setup and some guys have to be tracking their cars and working them harder than I do.

I do agree with you on the internal filter being to big, unfortunately the one that comes with the 255 pump just will not fit in the stock basket. I have looked at what the GTR guys are doing and it seems like they dont run baskets in high volume situations, I could be wrong but its just from what I saw after some googling. I would assume the GTR has the same saddle style tank as the 370z, again I have to spend more time looking at what they do, I could be 100% wrong. But if they run basketless and have a saddle tank with no issues why are we any different.

I think the issue is that the hot fuel is going back into that basket and its just circulating the same fuel over and over, a cooler would help but I am not sure where I would fit one. They also suggested using a controller to turn down the fuel pump at idle to minimize the amount of fuel flowing through the system.


I will hopefully pull it today and I hope its something simple like a oring leaking. I will pressurize the system and go from there I guess.

Thanks for the advice Lloyd!

Found the issue,

It was that same bloody oring that was blown out again. Either I modded my basket wrong or I am doing something incorrect, maybe I am just running to much fuel pressure for this stock basket. I turned down the pressure a bit got a fatter oring stuffed in there and we will try again haha.

Mitch

Scratch that, its back. Just when I think its good I just have to wait a little longer for the issue to reappear. Plus side I was able to touch 500whp before it started to lean out. Ugh. Anyone make a aftermarket fuel basket for this thing? lol.

I have this whole mess of an issue detailed in this thread for anyone who wants to do a little reading lol.

http://www.the370z.com/engine-drivet...ml#post3453234

I always loved this build and the BP kit. I might get it one day but congrats on the shop. You and sasha should team up and have a tuning/fab shop. All sorts of goodies would come out of that :D

This is what I managed to hit before running into fuel issues again. I am currently trying to figure out why the boost tapers so hard as well, I think I might try running a mechanical boost controller just to eliminate that causing my issues.

Not bad tho considering, if I can get the boost to hold I should see some more ponies haha.

http://img.photobucket.com/albums/v2...pscmfldsin.jpg

If I remember correctly my boost tapers hard at the top end too. I spoke to Sasha about it way back when but can't remember his reason for why.

I have a manual controller somewhere if you want it. I know the support sucks but I still think the evc6 is going to be the best bet. After trying the aem, blitz, and evc5 it's come the closest to levelling the boost and I still haven't really dived into the tuning software.

Considering our cars are basically identical if there is anything you want to look at on mine for comparison you're more then welcome. As far as I know I still have no lean issues on the top end.

Sent from my SM-G920W8 using Tapatalk

I want to try and figure this out now that I have the means to test and log the car properly.

James,

I might take you up on that offer if I dont have one laying around and I agree the EVC6 was much better but when the controller **** the bed and they wanted me to purchase another full unit (instead of just purchasing the controller) it upset me so I decided to try another product lol. That said if I set the controller to 100% and still cant make boost up top then id suspect its not the controller at all. That curve was with a 40% initial duty then added on 40% more after a few seconds and she still tapered hard. That said when I was down in vegas and my boost controller failed I hit 25 psi with no issues, so I dont know.

As far as the fueling Lloyd has a theory about the rubber line degrading and plugging the internal filter, maybe my filter is just plugged in the tank, I have a new drop in coming or I might just bypass it entirely and put a inline filter in its place.

I think the Z club guys might be on to something about the injectors Mitch. Who knows what happening at the top end with unknown injectors. Expensive fix to try but it might be the issue... Everyone raves about the Bosch....