teamvalorracing

in the ecu tune settings was it?

Black Nugget

Nothing officially determined as of yet, still keeping an eye on the coolant levels. Giving a call to spectacle tomorrow and hopefully we'll figure some things out.

In the meantime, still testing different theories.

Black Nugget

13 hours since last start.79' IAT.100% throttle.5 second crank.

Was in a small rush so forgot to check coolant level.

Black Nugget

Parked the car to run into the bank.102 IAT.100% throttle. Immediate start.

teamvalorracing

so,

long time between running and starts= long start

short times between running and starts = short starts.


its gotta be coolant getting in or the tune is slightly off at less than 100' IAT's.

Black Nugget

Originally I'd say its definitely coolant, but spectacle has me leaning towards IAT Table.

Any thoughts on the fuel pump or is that probably fine?

teamvalorracing

you have a fp gauge right?

just have someone watch the gauge when you go to crank it during these "test times". make sure it gets to full psi when you turn the key to onII. if, so, youre good.

its gonna be one of the 2. either tune or hg small leak. its hard to be precise over the internet. l0l

spectacle

Fuel pump is fine. If it was broke you'd be having way more problems than hard starts. We just need to resize the tables and pull fuel out to get this problem solved

spectacle

Let's try this.

Here is the screen shot of your IAT comp table:



What I want you to notice is the resolution of it. Its all over the place! -18deg to 224deg. Here's what that looks like on a graph:



The graph is upside down because we're dealing with negative numbers.

Works great for stock injectors, but as you have experienced the ID injectors are very sensitive to temp changes. The stock calibration isn't pulling fuel until 89deg, and you can see its not much at all. When you hold the throttle open during cranking, you are essentially leaning out the A/F and manually "pulling" fuel away because it is mixing with more air that's being introduced. Logic dictates that you need to remove more fuel at the IAT breakpoints that are hard to start. The problem with the table above is, the breakpoints don't have a high resolution for the datapoints your regularly drive in.

Per your response, the lowest temp you will see in VA is 20deg. So I got rid of all the below freezing(lol) breakpoints and brought the resolution in line with where you're having the most problems and the temps you'll encounter the most.

Enter these values in the IAT comp table -

For the IAT:
20
70
95
110
125
140
160
200
220

In the trim %:
0
-3
-5
-7
-7.5
-9
-12
-14
-16

Graph that out, and you get this:



Give those a shot without holding the throttle. If it doesn't start or takes a long time, revert back to the 100% throttle test (just be sure you know what IAT breakpoint you're at) and adjust accordingly. If it starts with the throttle open, you need to pull more fuel at that breakpoint. If it doesn't start with the throttle open, you've pulled too much and need to reduce the trim %.

Make sure you save your old calibration. Don't want to get stuck on the side of the road trying to get this right. Ask me how I know.

Black Nugget

Haha, thanks Spectacle! I'm off work in about an hour. You still want me to call? At least to maybe help from an understanding standpoint why removing injectors worked, yet its not injector issue.