Hey guys I have a small issue. I installed a vortech v3 on my 2006 350z roadster, along with supporting mods, the walbro gss342, deatshwerks injectors and an uprev tune. Since Ive installed everything and had it tuned, when the car is at operating temperature it has a hard start. The only way I can get it to start it push the gas peddle while im turning over the key.

On a cold start, normal driving and idle its perfect. Also, no check engine light. What could this possibly be? Ive played with the tune for a few hours, trying to add and remove fuel on start up and still nothing.

Could something have failed? Someone please tell me theyve had this problem! Thanks

 

its easily fixable. it means the tuner didn't adjust crank timing and priming tables for proper hot start. doesn't sound like any real issue.

 

Is there anyone on here thats completely familiar with uprev and guide me through this? My tuner wasnt familiar with uprev so he only knew how to do certain things.

 

read the uprev 101 thread its somewhere in there. you need to up crank timing to like 30 and lower priming pulse % in the higher temp ranges. depending on injector size etc it will vary a lot by how much you need to adjust priming pulse at the higher temp ranges, but it will probably be a significant drop to start with and then you can fine tune and dial it in when the starting gets better. just keep lowering priming pulse, reflash, then try to start it up, repeat until it starts good.

 

Not tryin to be a hater....but you got a tuner who doesn't know how to tune??

I assume this is because of your location??

 

100% because of my location. He know how to set the a/f ratio, the timing, how to squeeze as much power out of the engine safely and everything is perfect except for this. I'm pretty sure I already tried that jdmv35 but I'll give it another shot

 

Where in Canada are you. Montreal area?

 

priming pulse needs to be reduced by a lot with aftermarket injectors. I think OEM setting is 100% and with my 750cc's I have it set at like 2% or 20%, something in that low range at operating temperatures

 

With my 750 its at 5%

 

Should i lower the values in all of the injector priming pulse modes? All 4 of them?

 

Lower them all.

 

These are the modes im talking about

 

I adjusted from 60 degrees to 100 degrees from 10.2 down to 7.5 in all 4 modes and the car starts perfect! I also adjusted the crank timing from 20 up to 30. But one question- why is pulse mode 3 from the factory from 60 degrees to 100 set at 7.5 and the other 3 modes set at 10.2? Should they all be the same?