Fuel system
11-27-06, 07:54 AM
#1
Fuel system
How many people have a half-bridged Tii motor with a T04e and front mount and haltech e6k? What kind of fuel system are you using? Right now i have an fd pump with stock Tii injectors and it seems too lean too start and starts with starter fluid. Maybe some 850 primes and 1200 secondaries? ALso probably need a different pump too.
11-27-06, 09:04 AM
#4
Its one of those base maps from the haltech section. The closest was the street port with t04 and front mount with 500/1000s injectors, but i doesn't start until i spray the starter fluid. I don't know if its just the compression being low or injectors to small.
11-27-06, 09:49 AM
#7
Engine, Not Motor
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In general, base maps are just enough to let you start the car and drive it onto the dyno. Sharing of base maps is a bit evil because no two cars are exactly alike and if you run that map under load you'll probably pop your engine. Airflow characteristics between a bridgeport and a streetport are totally different.
To get the car start properly you are going to need to at least get the idle somewhat reasonable when it's warm. Then look at the Fuel Priming Map, The Fuel Post Start Enrichment Map, and Fuel Coolant Correction.
The priming map gives you the initial startup. Generally below zero you will be adding about 40MS which will taper off to about 15MS around 20 degrees or so. The post start map will add quite a bit of fuel during the first few seconds, generally 30% or so which tapers off quickly for the first 10 seconds. Then coolant values will add much more fuel then you expect. Think of a linear curve which starts at -40 degrees and ends at 80 degrees. At -40 you'll be adding 70% more fuel which will taper down to about 30% at 30 degrees and then taper down to nothing at 80 degrees.
These are values which have always worked for me in the past but again it's generic and you will have to tune to your specific application.
You only get one chance at a cold start in a 24 hour period so it's going to take some time.
To get the car start properly you are going to need to at least get the idle somewhat reasonable when it's warm. Then look at the Fuel Priming Map, The Fuel Post Start Enrichment Map, and Fuel Coolant Correction.
The priming map gives you the initial startup. Generally below zero you will be adding about 40MS which will taper off to about 15MS around 20 degrees or so. The post start map will add quite a bit of fuel during the first few seconds, generally 30% or so which tapers off quickly for the first 10 seconds. Then coolant values will add much more fuel then you expect. Think of a linear curve which starts at -40 degrees and ends at 80 degrees. At -40 you'll be adding 70% more fuel which will taper down to about 30% at 30 degrees and then taper down to nothing at 80 degrees.
These are values which have always worked for me in the past but again it's generic and you will have to tune to your specific application.
You only get one chance at a cold start in a 24 hour period so it's going to take some time.
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11-27-06, 03:58 PM
#9
Engine, Not Motor
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All standalones are fundamentally the same, they just bury the functions in different spots in the software. So almost any ECU tuning guide will help. The Microtech manual has a fairly decent step by step point form flowchart for tuning which you might find helpful. The manual is downloadable from the website, http://www.microtechefi.com . The MegaSquirt MegaManual ( http://www.megamanual.org ) has a good tuning overview as well.
11-27-06, 04:43 PM
#10
Originally Posted by Houstonderk
I wish there was like a powerpoint on how to tune an e6k, so everyone could figure it out, because that would really help. I will check out those 3 though.
Ordinarily, base maps are pretty good in the coolant enrichment area. You may really just need to bring up the IDCs on your fuel map (0 rpm, 500 rpm and 1000 rpm) to compensate for the additional fuel your B-Port undoubtedly needs. Remember, the Haltech interpolates between those signals, so at 800, you kinda use a little of both, although you can use the "Homing" feature to make the screens follow the pointer.
Rat
12-03-06, 02:14 PM
#13
No matter how much i richen it up it only wants too start with starting fluid. I richen the hell out of those three and the fuel map for the 0 and 500 rpm and the same thing. Thing sounds crazy when full throttle at the tb when starting though. Like hearing it sparking inside and then when giving it throttle it just gets worse like leaning all the way out but i can't find any half-bridge maps to see the difference in those and street port fuel maps. ahhh.
12-04-06, 10:04 AM
#17
Engine, Not Motor
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Can you post your MAP? I can take a look and do a basic adjustment to what I think should start the car. 
Starting a bridgeport doesn't really take much more fuel then a streetport but it will take more fuel to idle and drive in the low RPM region.
Starting a bridgeport doesn't really take much more fuel then a streetport but it will take more fuel to idle and drive in the low RPM region.
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