Running like shit when cold
 

Not sure if this is in the right section, move it if need be. Fuel setup; Walbro 255 High Flow pump, DSM 450cc Injectors with resistors, stock fuel pressure regulator, and filter and lines.

I was tuned on uberdata back in September to start things off. I've always had a problem getting teh car to idle at all. Start it up, runs for a minute or two, then dies. Same thing over and over until the engine is up to it's normal operating temperature. Pretty sure it's teh IACV to blame, still need to replace it.

On another note, when it's cold, period (engine temp, or outside temp) the car runs like ----. Randomly misses, and just runs like crap in general, unless the engine can get up to operating temperature. And as of recently, it's been so cold out, that no matter how long I run teh bitch, it won't get up to it's normal operating temperature. Normal operating temperature for my shitbox seems to be a mark or two before the midway point on teh temp gauge. At which point the car runs fine, no misfires, will normally idle at a g for me, and not die.

Could my second problem also be caused by my faulty IACV? Or is it a completely seperate issue? Sorry for the stupid questions, but this area is defintely not my cup of tea.

Thanks for any help.

Re: Running like shit when cold
 

too much fuel pressure..........WAY too rich in cold start loop.........

Re: Running like shit when cold
 

sounds feasible.

but when I first turbo'd the car, same setup, different engine, I ran teh chip the guy sent me, and never had any problems. Given it was only in teh summer, but it never had a problem idling at all. And as stupid as it is, I was using his tune from his car (same setup I had) as mine.

Re: Running like shit when cold
 

different engine, different tune, different weather..........

Get a FPR to drop the base pressure at idle down to correct levels

55 psi fuel pressure in the cold is TOO MUCH fuel.

Re: Running like shit when cold
 

Ran 60psi w/ A1000 + 1000cc on a built GSR with no issues... with Neptune.

Uber / Crome currently have a nasty "bug" - the IAT and ECT correction things aren't working quite right...
I'm not doing ---- with Uberdata anymore, but Crome should see some significant updates in the coming weeks that address these issues fully. As soon as my testing is complete, I'll be making some releases. Crome's P72 support might be enough to work with Uber bins, might not. Just have to wait and see... Or learn to code and fix it yourself.

Lowering the fuel pressure drastically will probably have nasty effects on your tune at WOT.

Re: Running like shit when cold
 

Ubers current IAT and ECT.... ugh...

Re: Running like shit when cold
 

DAve, problem is he's using a stock FPR with the 255 HP pump, the regulator can't bypass enough fuel back to tank at idle/low rpms, even worse when it is cold. Once he is under way base fuel pressure will drop back to normal/stock range.

Almost like a rising rate FMU, only in reverse!

Re: Running like shit when cold
 

You're following old rules, Bone.
I've run at least two dozen cars with walbro 255 pumps and stock regs...
And guess what? With a little tuning, they idle at 14.7-15.3:1 AFRs. Perfect.

This whole cold start issue has to do with the fact that neither Crome nor Uberdata modify the ECT enrichment table used for idling! (there are about 5 or 6 ECT correction tables) In addition to the idle, there may be another table in use prior to another modifier becoming active - i.e. on startup.

Re: Running like shit when cold
 

So, it sounds like it really boils down to some problems with the Uber software.

I hadn't planned on turning the fuel pressure down without my tuner present to basically retune on the lower fuel pressure, to prevent any leaning issues at WOT.

I appreciate the input guys.

Re: Running like shit when cold
 

it sounds like it way too rich when eng. temps are cold. You should have it tuned for part throttle.

my girls car was running way too rich in part throttle and she was only getting about 160 miles per tank of gas. I took out about 15% fuel and now she gets about 240 per tank. I still have to do some more tunning in part throttle.

anyone can tune full throttle but part throttle is where the most tunning is at.

Re: Running like shit when cold
 

The tuner tuned WOT first on the street. Then went and tuned partial throttle for nearly an hour. Ran well all summer, so it's got to be something with the IAT

Re: Running like shit when cold
 

You're an ignorant ---- that needs to learn how this ---- works before you go spouting off at the mouth. Zip it, kthnx. There are severe issues with the current freeware and ECT, IAT less so. I load-cell tuned every ------- cell of the map (well, almost - couldn't load it enough to boost below 2500 RPM) on a car and it ran like ---- when it was cold. Hmm. Maybe something other than part throttle tuning is at work? HMM. MAYBE.

Re: Running like shit when cold
 

I hope you do realize that the ecu will allow more fuel when intake tempererature is cold, and therefore if not tuned properlly at that temperature the car can run rich.

And as for the comment above, I think you are the ignorant one, cuz you don't even know who I am, and my tuning background.

Re: Running like shit when cold
 

Oh, Jesus. We have us a real live tuenarboi right here!

Cut and paste him the pertinent bits of the dasm, Dave, and let him show you where you're wrong. This should be good for a laugh.

Re: Running like shit when cold
 

:1 ;)

Re: Running like shit when cold
 

Once I wade through the miles of obtuse convoluted obfuscated spaghetti better known as the P30-203 and P72-273 ROM, I'll post the pertinent morsels. And then you can see that on this issue, *I* am right and you are wrong. You forget basic EFI theory! ECT and IAT corrections don't just exist in a vacuum - they serve a purpose, name air density correction. That's the whole ------- point - not to correct for ECTs, but to correct for AIR DENSITY as a result of changes in engine coolant temperature (i.e. hot hot the head is) and intake air temperature (i.e. how much heat the air soaks up as a result of your turbocharger / intercooler / intake piping / intake manifold). There is no such thing as "having your car tuned at that temperature" !!! What it's called is having your air density correction fucked to hell and back, and the fix requires a combination of changing the corrections that the honda code monkeys put in place and changing which of those corrections are used when. Thankyou for calling, have a nice day.

Btw, 98ctr... Do you know who you are talking to? My dick is bigger than my ego, rest assured. Is yours?

Re: Running like shit when cold
 

Re: Running like shit when cold
 

No, but at least im not a coplete ------- about it. ;)

Re: Running like shit when cold
 

Too bad it wasn't the other way around. Then I'd have a fast car. :6
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Re: Running like shit when cold
 

True - you are a well balanced mixture of ------- and clueless.

It's almost adorable.

Re: Running like shit when cold
 

I think you miss understood me. I did not say that you tune the car at diferent air temps, but that the air temp afects on how much fuel you will get. If and only if, anyone have fucked arownd with the corretion values, it will make the car run like shiet when cold.

Take it as you want, it makes no difference to me.

Re: Running like shit when cold
 

PV = nRT

n = PV / RT

P = pressure (MAP sensor)
V = volume (displacement / 2 * RPM for our motors)
R = ideal gas constant
T = temperature, i.e. density correction


The whole point of ECT and IAT corrections is to control the impact of temperature changes on AFR (and timing).
The idea here is that you approximate the temperature (i.e. density) of the air going into the combustion chamber by two sensors you can read, instead of putting a sensor in the combustion chamber that has infinitesimal measurement delay and total accuracy.

The stock ECU routines were setup by honda's lawyers to run the car with 240cc injectors. When you put larger injectors in a car running on OEM honda code (Uber, Crome, etc.) the magnitude of the corrections is totally innapropriate to do anything other than cause chaos. Additionally, our lovely honda engineers saw fit to use different correction tables for open loop, closed loop, idle, ... ... The code is horribly obfuscated. Mark my words, me/Calvin/Damian will get to the bottom of this mess soon.

I know I'm an ------- a lot. I just don't like arguing with people over things they're wrong about.

Re: Running like shit when cold
 

lol, now thats funny :P