dandan

If you adjust the regulator from say 40psi static to 50psi then yes that 10psi has a direct effect on the volume of fuel injected. You then maintain a 50psi differential across the injector, as opposed to the 40psi you had before you adjusted the regulator. That is a different story to another 10psi of boost, which via the regulator raises the rail pressure to 50psi... the differential is still 40. Fuel flow will increase if the pressure differential increases (Rail pressure - intake pressure = differential pressure)

Correct. Doesn't mean more fuel goes through the injector though.

The fuel is being injected into a region of higher pressure though Wez. If you applied 3 bar to the rail and injected into a beaker the volume would be the same as if you applied 5 bar to the rail but were injecting into a sealed beaker held at 2 bar. It's the pressure differential from one end of the injector to the other that is important and this is held (ignoring dynamic effects - not what we're discussing) constant with a normal 1:1 boost/vacuum referenced fpr. With the ign on you will probably see around 40psi in your rail. At idle this will be more like 30psi and at 1.4bar boost you'll be around 61psi rail pressure. The regulator makes sure the injector is always working with the same differential pressure - in this case, close to 40psi.

As per title. Not looking to spend a shed load of cash on this as it's going to be cut up and "projectized"! Mild steel would be perfect - no need for s.steel or chrome bling here! Cheers Dan

As per title please. Many thanks Dan

Attached is the comparison I mentioned. 1.1bar with the 1st cat still in place. 1.1bar with no cats but with a suitable size restrictor ring. Clear performance benefits are there to be had!! Things should run a little cooler and the car will be a little louder.

Gotcha. Very nice.

I have a comparison graph I plotted from the dyno. Both runs at 1.1bar, one with the first cat still in place and one with a full decat with a restrictor ring to get me down to 1.1bar. The results speak for themselves. I'm not at work so do not have a scanner but will see what I can do with the digi cam. I like the double decat approach but I do find the boost curve and power delivery is a little less savage with the Nur Sec baffle in place as well. This drops the boost a fraction but makes things a little smoother, less savage and more predictable on the road.

Can you extract and post up the map? We have seen symptoms of extremely badly mapped cars causing all sorts of issues. A 10 minute lookover by the right people here often highlight the obvious mistakes (if any).

What are you using as the plug, to "plug" into your resistor pack Tony? Did you source a Toyota connector to suit?

Sorry guys, missed this and am interested in these. Without reading the whole thread.....Where do I sign up if I want 3x aerial brackets and when would be a possible delivery date?

Offer pm'd to you my friend..

Did you go with an HKS setup in the end or keep the EMU?

Yeh just the rail really. I'll wait and see if anyone wants the whole lot first as I am not desperate - save you splitting it apart.....

I could do with a spare fuel rail Simon, what sort of figure do you want for it?

I can't really give you an address that will always have someone there 24hrs a day. This is for my brother so I'll pass your message to him and see what he says. Thanks for the reply....

Anyone got one to suit a J spec non vvti? Traders or private. Cheers Dan

Would you take £45 incl postage Ernie? Also is the brown mark in the middle just on the pic or is it on the card?

Did you get my pm Nic?

Same as at my place then!

So all normal bpu vvti's (decat and exhaust) will all be running 10:1 at 1.2bar? What the hell do they run at 1.0bar then as the fuelling at 1.0bar must be the same as 1.2bar unless the airflow sensor is calibrated for airflow figures found when running above 1.0bar. Maybe the MAF has an advantage over the J spec MAP sensor and actually has some idea of what's going on at 1.0bar+ Edit: One of our bpu vvti's will be on the rollers again shortly but when I last had a wideband in the one it was not 10:1 above 1.1bar. I'll try to find some excel plots to check but may have to wait to RR time to double check. If they do run that rich normally(!) then maybe worth asking Alex about his car as he had an Emanage on that with his single. He might be able to help you out with install/mapping advice.

10:1 at 1.2bar is more than OEM rich. I don't think even the vvti's overfuel that much. My BPU runs 11.5:1 at 1.3bar and that's with a Mines ecu geared up for more fuel at high load. I think you may have something else amiss that needs attention. Do you have a non stock fuel pressure regulator?

Good stuff, keep us posted!

What ecu are you going to use Tony? Are you sticking with the AEM or going for a Motec?