PowerFC: Some DIY tuning comments please

[The Mafia]

Just remember, when warming up a car, you shouldn't be looking at the water temp. You should be looking at the oil pressure.

I set the 50c to 1 and forget about it. Those corrections are a pain in the bum. A lot of the drift guys here like to run 70c thermostats.

[Dose Pipe Sutututu]

Each to their own I guess, but even if the water is at 50 degrees, the oil is still pretty cold & thick, remember that R33 use a water/oil heat exchanger.

[The Mafia]

That's what I was saying. Don't watch the water temp, wait for the oil pressure to drop to normal levels.

[discopotato03]

Yes well at the risk of splitting hairs I think the whole idea of cold enrichment is to make up for cold pistons chambers and valves absorbing initially a lot of combustion heat wchich pulls down the combustion temps and combustion pressure . More fuel means in theory more heat and when the internals heat up they don't rob as much heat from the combustion process .

I don't think the extra fuel is there to overcome cold oil drag unless the oil is a high viscosity dino oil and the outside temp is very cold .

For the record I just changed to Rotella 4T which is a 5w40 and I get no starting issues with EFlex E70 and the Datalogig showing around 10 deg water temp .

I just highly doubt coolant temps in the mid 70s indicate that an engine would need extra fuel .

Yes and I was wondering about those who chose to run cooler than std thermostats because in cold thempratures their engines may not even get to 80c .

A .

[Dose Pipe Sutututu]

marketing gimmick? oil needs to be at around 90 degrees to perform at its best, and like I mentioned before about the water/oil heat exchanger it's there for a reason to warm up the oil.

[black bnr32]

anybody running big cams on a 2.6 have their 'Accel vs TPS1' settings handy? Accelerate injector would be good too.

I'm getting a bad lean hesitation with a throttle stab near idle, and I can't seam to cure it with those settings. Only thing that works is to add fuel to the INJ table.

Edited October 25, 2012 by black bnr32

[discopotato03]

I think the heat exchanger is there to warm and cool but I suspect it has a say in cold start and warm up exhaust emissions and that what probably drove Nissan to provide it .

You'd think GTRs would have gotten oil radiators like Evos did but they got exchangers AFAIK too . Doubt the racers had exchangers .

A .

[Dose Pipe Sutututu]

anybody running big cams on a 2.6 have their 'Accel vs TPS1' settings handy? Accelerate injector would be good too.

I'm getting a bad lean hesitation with a throttle stab near idle, and I can't seam to cure it with those settings. Only thing that works is to add fuel to the INJ table.

hard to trade that table, unless someone has same cams, same injectors....

richen up the a/f on idle see if that helps.. I find cars that I've played around with running longer duration cams do not like stoich on idle

[black bnr32]

hard to trade that table, unless someone has same cams, same injectors....

richen up the a/f on idle see if that helps.. I find cars that I've played around with running longer duration cams do not like stoich on idle

It actually idles nicely. Its the large throttle inputs right after idle that are a problem.

[turbomad]

Hi to all what program do you guys recommend to use with fc-hako and where can i get it from?

[DVS JEZ]

Black bn- if. Have an oversized theottle body it may be hard to get off idle throttle stabs correct,

Just have a play with the accell settings. Keep adding accell too see if it likes it

[discopotato03]

An RB26 would be very different with its individual throttles because the rise in manifold pressure would be fast and you need to toss a fair bit of fuel in to keep a reasonable AFR .

Its take a bit of getting head around but these computers have a unique idle setting state if you did the idle learning properly and you don't seem to get access to this even with Datalogit , not sure if you do with Apexis software .

I'm finding that you need to play around with the injection and timing tables just off idle where it changes to these map settings .

Its interesting to watch Datalogit in log mode so you know exactly where the engine is live .

I think its a juggle of how much innitial fuel comes from the accel settings and how much from the fuel table . ATM I have things a little richer in the 400 800 1200 areas while further up I leaned out the upper cells and pulled a bit of timing out to stop it popping on the overrun . I find the more you can get using the fuel table the better the consumption tends to be but don't forget to play around with timing settings as well .

I think there's limits to what can be done without a dyno and someone who knows what these engines like where timing wise .

A .

[DVS JEZ]

Oops didnt read it was rb26.

[black bnr32]

Oops didnt read it was rb26.

thanks anyways, and yes i played with the accel settings quite a bit, but had no luck. ended up adding fuel to the base map. not a huge deal as this is a race car

Edited November 6, 2012 by black bnr32

[DVS JEZ]

Normally its the mapping rather than the accell