TPI start, slow?
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
TPI start, slow?
Perhaps I'm spoiled by newer cars, but I expected the car to start quicker once the TPI + HP EFI were installed.
Does this seem slower than normal?
http://www.youtube.com/watch?v=U7WdTZA5Y5c
Does this seem slower than normal?
http://www.youtube.com/watch?v=U7WdTZA5Y5c
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
Yes. Did you add or remove?
The Cranking Fuel table is the amount of fuel injected while the engine is cranking. The base tables should be fairly close for most applications. If this table is too low, an engine may have extended cranking before starting. Increase the value at that engine temperature and see if the startup improves. If an engine starts and is “loaded up” (too rich) with fuel, these values may have to be decreased. Engines always require more fuel when they are cold.
The Cranking Fuel table is the amount of fuel injected while the engine is cranking. The base tables should be fairly close for most applications. If this table is too low, an engine may have extended cranking before starting. Increase the value at that engine temperature and see if the startup improves. If an engine starts and is “loaded up” (too rich) with fuel, these values may have to be decreased. Engines always require more fuel when they are cold.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
For the L98 computer, I added. IIRC, the L98 computer had a modifier for fuel amounts based on amount of time cranking.
What is the current setting?
Try adding a little and if that helps, keep going until it stops having an effect and then back off a little bit.
If it doesn't help, as the instructions say, you need to go the other direction.
What is the current setting?
Try adding a little and if that helps, keep going until it stops having an effect and then back off a little bit.
If it doesn't help, as the instructions say, you need to go the other direction.
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
It's a TPI manifold with 8 22lbs injectors, the value changes based on coolant temp, from -40 to 260, 20 deg inc.
48.0 46.0 44.0 40.0 34.0 29.0 23.0 20.0 17.0 15.0 14.0 13.0 13.0 13.0 13.0 13.0
48.0 46.0 44.0 40.0 34.0 29.0 23.0 20.0 17.0 15.0 14.0 13.0 13.0 13.0 13.0 13.0
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Burning Brakes
Joined: Mar 2012
Posts: 871
Likes: 73
From: Memphis Tennessee
Have you checked your fuel pressure? Most pumps have a check valve so fuel pressure doesn't bleed down when you shut it off. If either the check valve or the regulator lets the pressure bleed down, then you'll get an extended crank untill fuel pressure builds.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
This is true, but I switched to an 89 tune in my car (which eliminates the cold start injector) and fixed the long start by going through the process I mentioned above. I doubt Holley's EFI programming or wiring has the capability to pulse a cold start injector.
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
No, new pump, new lines and new injectors. I have the Holley EFI set to 5 second prime, so even if I prime the pump before starting it starts the same way.
Thread Starter
Holley HP EFI w/TPI
Joined: May 2009
Posts: 553
Likes: 0
From: Kanata ON
