VT11 8650 cold start issue

[spouk3]

Hey guys, since I changed my injectors and flash the VT11 8650rpm tune I have a ruff start issue when engine is cold... It sounds very ruff and it shake like it's knocking a lot... Ill try to catch a video later to help... Does someone had the same ruff start issue with this tune?

Ho, and after a second or two, it's running great at 1700rpm steady and the rest is very good, since everything is tuned with the datalogger!

Thanks!

[SLASHER]

I have same tune and injectors and no issues ..

Try changing plugs , is base fuel pressure at 58 psi ?

[spouk3]

Base fuel is 58psi... I'll change the plugs... They did a couple run before I realized my intercooler was throwing water in my engine so... Plugs are a good start...

[Carlos Thomas]

I want to say that I noticed that also. I run the VT11 8350 Tune. I will confirm it this weekend. Prior to the install, it would fire up and lock in on 1700 RPM right away. I want to say now on a cold start it was at 1600 then moved to 1700 after a few short seconds. Or it was north of 1700 and came down. But I will confirm tomorrow afternoon (California Time). My plugs were changed at 98 hours (Complete Oil Change Service) in May. I am at 113 hours now.

I will say this...unless you are looking for it, then most people will not notice the start of the motor. Where I launch from normally, I have to idle for about 2 to 3 minutes to get out of the no wake zone. By then, my motor is ready. I normally ride it for 2 minutes after that at maybe 75% throttle at the most. Then I ride it like a stole it. That is my normal playbook.

When I used to race, I wanted a cold motor so I can have no heat soak for that holeshot.

[spouk3]

I'll check plugs today... But I'm sure it was OK prior to VT11 tune/injectors... And it's only for a second or two when I crank the engine... Too much fuel/too rich when starting? I'll make a log and post here later!

[Carlos Thomas]

BTW, how many RPM's are you turning with your setup and where are you in terms of speed (on the GPS)?

[spouk3]

Was turning 8560 earlier this summer... Had a lot of issues (intercooler and injectors) was running 75mph GPS now down to 73mph it's very hot and 80% humidity

[spouk3]

From left to right cyl: 3-2-1

[Turbo Nick]

Is there a cold start table in the tuning software?

[spouk3]

Yes, vtech software have a cold table