Helping My Son With His Project

[macka'sxr6t]

Thanks for your advise I'll take it on board.

On another note we are having trouble get the boost over 7 psi. The external waste gate has been set at 7.5. We have tried a neumatic bleed valve but that does'nt seem to change boost like it does with an internal wastegate. We want to up the boost to 15-18 psi what are our options.

[dansedgli]

Stiffer spring in the gate.

Are you sure the bleed valve/wastegate hoses are connected properly?

[AGENT ORANGE]

Spring and hose connection to the valve would be wat is holding you back, if you can budget it, go Electronic boost control that with a External gate is the most exact control you can have. plus get a 20psi spring so that the boost controller is doin the work when it has to open not just the spring being to soft..

what sort of gate is it, I used to have a 42mm pro gate with a 20psi spring and ran a HKS dual stage EBC was rock solid once it was tuned in on the dyno, boost curve was a dead straight line no waver at all in the boost, cant recomend enough.

Price wise have a look in the jap wreckers for EBCs usually come in half cuts and are taken out to sell seperately might get yourself a bargain..

keep up the effort bet your son is loving it, the thing will haul arse at 18psi

Edited 01/02/08 01:19 PM by AGENT ORANGE

[macka'sxr6t]

Thanks Guy's will chech over connections again. I'm not sure of the actual brand of the waste gate but I will have a closer look so that I can source a stiffer spring. all I know is that it's opprox 40mm. EBC sounds like the way to go as well I'll check out some Jap halfcut importers

cheers and thanks for you help again

macka

[MrBean]

@ Macka: You're welcome

Show pics when you're done....

[Dillz]

That is a sh*t load of Torque for 180rwkw at 6psi, great work Macka.

[macka'sxr6t]

We went out this arvo to do some open road cruise tuning, 80, 90 through to 110 km/h. We have the engine running nicely returning 14.7 A/F ratios. We then started tuning part throttle acceleration 80 - 110 km/h.

We have made some good gains in performance without running extra boost, I must say this thing definately has more grunt than my ute did running same boost levels. 80 - 110 is effortless. Economy is great as well we drove from Mildura to Renmark and back approx 240km round trip and did'nt even use a 1/4 tank of fuel it was a pretty hot day as well intake temps were in the mid 40's just cruising and rose up to mid 50's during acceleration runs.

As I said, we have made some goods performance gains I'd say from experience somewhere close to 220rwkw. We still have the rising rate fuel reg hooked up as well as the 42lb injectors and we were unable to pull enough fuel out of the map on acceleration runs could'nt get the A/F ratios leaner than low 10's. only using 12 ms of injector duty cycle. We have decided to remove the rising rate reg now we have fitted the larger injectors.

The fuel map is looking like Niagara Falls where we have tried to remove fuel instead of it looking like Mt Everest.

We have'nt had much of a play with timing at this stage as suggested by Mr Bean we're working on the fuel map first. According to the data logging we are running 21.4 deg @ 3000 rpm and 6psi of boost there is no detonation at this point so we added about another 7% trim and there was still no detonation. We have decided, though to set ignition trim back to 0 % until we sort the fuel map out properly.

That's about all I have to report for the moment I'll keep ya's posted once we remove the fuel reg. Really can't wait until we can through some decent boost into the engine but we'll keep taking small steps for now.

cheers

Macka

[RAP1D]

I would use the stock reg until you cant suply enough fuel at some loads. I squeezed 280odd out of my old ED (11psi) using stock reg,walbro intank and 550cc injs, so it does do a reasonable job.

Can you pull back injector scaling, or is it set via injector size?

What ratio reg is it?

Road tuning is great when you have decent knock sensing and wideband readout in front of you.

Sounds like its coming along well.

AFR wise I agree with mr bean... lots of fuel is just a safety thing with many different views to what is optimum... Ive leaned turbo motors into the 13s on a bar or so of boost and as long as knock is closely monitored and controlled, its safe.

There are some good knock detecting kits around if you look for them... knock box was a good one but I think its no longer available.

[macka'sxr6t]

Thanks for the help Rapid,

Tthe rising rate is a vortech 12:1. I was looking at the software options last night in the trim section and they have an injector scaling option. It's currently set at 40 options are 0 - 80 this is what they say in the help section.

"E.G. scale number of 40 = 20mS max injector opening @ 0% Fuel Map override

setting.

Note: As a guide, the injector time scale should be set between 10 and 30 when in multi point 360 mode and between 40 and 80 when in multi point 720 mode. If you find that you need to go above or bellow this range you may need to change injector size or there is a problem in the fuel delivery system."

The only problem that I can see is we're pushing in to much fuel becuse of the reg. My thoughts are that even if we up the boost level to use the extra fuel the reg will only throw in even more fuel. I know at some point all this will even out. I've even thought about putting another bleed valve on the reg but that's just adding another variable to sort out. Anyway back to the injector scale time.

I am running the engine in multi point 720 mode. So I am assuming that if we keep the fuel reg I would have to reduce scale time. The data logging indicates that we only using 12 ms.

Any suggestions would be appreciated.

macka

[macka'sxr6t]

Hi all, we are starting to make some progress with our tuning, had our first kills, one skyline and a BF GT. I have'nt changed much, just a bit of fine tuning on the fuel map. Still running same boost level approx 6 psi.

Even though I have'nt had any experience with tuning other than watching closely and asking heaps of questions while at the tuners as they tuned my ute and 30 years experience tinkering with cars mainly V8's, It certainly feels good that we are making some good gains.

Once we are satisfied that we have reached our limits and finished the intake mods, we'll be taking it to the dyno to really see what's in this engine.