Did moving the injector help with the atomisation issues (at part throttle?) you were talking about?

93kWs is nothing to sniff at!

With the 2200cc injector in the manifold it just didn't seem to have the time to vapourize the E85 properly. It's a bit hard to describe the problem, sort of fluffy and starts to drop cylinders under load. The power just isn't there. This included testing with and without the intercooler.

I then went back to having no intercooler and placing the injector in front of the compressor. I spent a bit of time playing with a manual boost controller and ignition timing.

The best it made was 174Nm and 103.4Kw at 18Psi.

I found it interesting that it made 80Kw on unleaded at 12 Psi and only went up another 23Kw with 6 Psi more(18Psi) using E85. I think this is the restrictions through the standard manifold and head really starting to choke it.

It was only ever built to make 60-80Kw so the standard gearbox would hold up for a while. Even at these levels the clutch kit would have to be upgraded.

Just thinking out loud, 18psi is a PR of 2.22, 12 is 1.81, that's a relative increase in intake pressure (absolute) of 22% so everything else being equal your increase in power is pretty much on the money/ fairly respectable. This assumes atmospheric pressure is 14.7psi at your place, it's probably a tad lower since Ballarat's on a hill. (You always have to use absolute pressure and not gauge pressure when looking at the effect of turbos.)

Yeah, and with more pressure comes more heat, so a 20% increase in manifold absolute pressure doesn't automatically give a 20% increase in power. Density is lost with the heat.

Although not thread related, I'm tempted to build a nicer inlet manifold and fit a decent cam and springs. I'm thinking it could make 150Kw on the A12 head.

That's why I reckon it's pretty good, you got a 28% increase in power! Better than expected (probably because mechanical losses are more or less independant of BMEP).

You are right, it is a good improvement. I think I'm just used to my race A12, where 6psi makes about 60kw difference! The percentage improvement would be similar though.

Today during testing the relevant weather conditions were: 96.7Kpa, 34Degc and 35% humidity. Its about 440mts above sea level here from memory.
I hadn't applied the correction to todays figures either. So it was actually making 110Kw. I must get onto configuring the dyno software so it does it automatically!

Hey Sikyne Did you get my PM?

Thanks

thats nuts as 174nm (128 lbs) is what my old camper lugging 4 tonnes used to make with the reco 2ltr engine with 45mm factory inlet valves 36mm exhaust, 89mm bores and 108hp albeit at 3000rpm. The 56a Gearboxes werent made for that torque!

Simon do you think chopping up a standard mani but feeding it as a sidedraft and drawthrough with the same single 2200cc injector would be able to make a little more hp than through this setup which makes a full U then 90 degree turn?

I can't picture what you are describing D. Any improvement in manifold flow will improve HP, if that is where the next restriction is. It might be the valves or ports that are the next bottle neck. The next obvious thing to do would be to put 4 injectors in it, pointing into the warm ports so that an intercooler can be run when using E85. If I was to do that, I would probably build a new manifold from scratch.

I could also try the large injector in the manifold with unleaded. The smaller one was maxed out at 93kw with the intercooler.

Just for interest, each 90deg bend causes about a 5% reduction in flow. That's a general rule for ductwork. This would hold true for the manifold if everything else was oversized and the manifold was the only restriction.