A couple of weeks ago I think I saw this same problem from someone else but I can't find the thread....

My installer was dynoing today after a weekend Vortech install. 1st run was out of the box and only run up to about 6k RPM (he said it was about 310 rwhp). On the 2nd run the HP dropped drastically at 4K RPM and A/F went lean (?). It appears secondary pump did not kick in. After checking wires to secondary pump everything was OK. So it seems to be a computer problem. Can anyone confirm this? I thought someone here had a similar problem recently and I am wondering what the outcome was.

 

gotta edit the split sec box to make the pump turn on sooner.

 

Thanks Dollar. The puzzling thing is that the 1st run seemed OK (stready HP increase up to 6000rpm). Installer was contacting Vortech late this afternoon & I haven't heard back yet. I will update tomorrow.

-Z-

 

The reason it happened is because you downloaded the settings already in the ECU (which doesn't correctly set the pump turn-on settings), and then uploaded incorrect settings prior to the 2nd run.

It's easy to fix. Load the customer file, then click Options | Output settings to bring up the Output Settings dialog box. Set the Over RPM to something like 2000 rpms and the Over PSI to something like 1 psi. You just want to make sure that the auxiliary pump comes on when you start boosting.

--Steve

 

here is the thread that will answer your problem........start reading around page 2-4. Good luck!....



-FluidZ

https://my350z.com/forum/showthread....threadid=69509

 

I'm pretty sure the fuel pumps settings were correct.

We started the session by reading the Vortech map from the controller to a new database on the PC. It was that database we modified. No changes were made to the Vortech output settings. The output settings are as follows:

Over RPM: 500RPM
Fuel Pump Start Pressure: 0psi

If I 'm understanting the parameters correctly, the fuel pump should kick on when the RPM is more than 500, and the manifold pressure is greater than 0 PSI (atmospheric). This means that the aux fuel pump won't kick on until there is positive manifold pressure (boost).

We are pretty sure the box is defective. Seems like Vortech has seen this before.

Comments welcome.

Pete
Race & Custom LLC

 

ok did you check the box that read Vacuum / Pressure in the system settings and Programable signal calibrator in the system settings..........? If not it defaults to Gauge pressure..........also I would set output setttings in the "B" mode to read "over RPM and Pressure" and "over rpm 500" and "over pressure 1"

 

That certainly would NOT explain why the pre-tune run didn't have the problem. I could be totally wrong, but it sure sounds like this is being caused by the auxiliary pump not turning on (when it obviously did in the 1st run).

--Steve

 

We did the install and the program run was the stock program with the split second box. No changes were done. When the second run was started - the fuel pump 100% stopped at 4400 RPM.

All wiring and every voltage check was done. We also worked with Vortech to insure the Split Second box was bad. We pressure checked the complete system as well.

We never had a chance to do any fine tuning with R4.

The new box arrives from Vortech this morning and we will reinstall and then re-test.

Regards

 

its the EXACT problem mine had, have to change the output settings. mine was fine on the baseline run, but once you make a new customer file, the settings are different.

 

Thanks Tig, Zimbo, Fluidz, Dollar, etc. I REALLY appreciate your input. Avalon is doing install and surpriZe is helping with tuning and I told them both to go to this forum specifically when we found the issue. They are working on it now. So far install looks awesome and communication has been great with them. I am hoping this is just a "minor" snag.

I knew the issue sounded familiar Tig! Once I get the car back and load the SS software into my laptop I am sure I will have tons of questions for you guys. It is obviously something I NEED to become very familiar with.

I will post when I hear more info. Thanks again - love this forum!

~Z

 

Just an update...

New SS box was shipped from Vortech. I picked up the car last night and will be having it dyno'd on Wednesday. Feels really strong but I don't want to push it until after it is tuned.

Exhaust seems very loud (in a good way) and a little raspy, but based on other comments here I expect it to mellow out over time. Installers did a great job squeezing 3 gauges in empty nav cubby and so far I am very happy with install of all components (S/C, exhaust, sways, clutch/flywheel, etc.).

I will update more after Wed.

Thanks again for all of your input earlier in the week!

 

I have a G35C 6MT and am considering the JWT clutch and flywheel. Inside the cabin ; how much noise has the lightened flywheel added. I know this is subjective , but in you opinion, how pronounced is it at idle with clutch out?

 

The JWT clutch & flywheel (IMO) is the same as my stock sounded. My stock clutch had a very small amount of chatter when clutch was in and the JWT is the same. I am very happy with it so far.

 

Do you have a picture of the 3 gauges in the empty cubby?

Chops

 

here you go

 

Sweet!

Thanks

 

kznard.........you need to get rid of that $60.00 narrowband A/F meter and purchase yourself a AEM wideband A/F meter.........narrowband is useless.

 

Fluidz - I KNOW! AEM wideband are backordered so installer threw in the narrowband for now (useless other than cool looking lights for those who don't know!).

-Z-

 

performance nissan in duarte has tons in stock............talk to jason