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Its a big cam all about peak power now, spool doesn't really matter its either on boost or not. Gonna have to get some boost into it on e85. v8 na builders always worry about rpm, turbo engine builders always worry about boost, the truth is somewhere in between. Boost is safer than timing to a point.

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Did some tuning today. Apparently gapping the plugs did the trick cos straight away it ran up 605awkw with no tune changes.   I frigged around with fuel and boost and this and that, and mana

Here's the graph. I had to run it in 3rd to get a number as I was hitting a speed limiter in 4th and was too tardled to work out how to remove it. I disabled it in the vid block, changed it in the tun

Got to the dyno today and it went pretty much as I expected. The exhaust showed to be a huge restriction but we all knew that anyway. The first run right off the bat showed 367awkw on 16psi and

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Idling sounds sweet and it's real not a ghost in site! Tbh I like the ghost cam also because who doesn't love technology... Have your cake and eat it to I say.

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I went for another drive and it's crazy how much difference there is up top. I'll be very interested to see how much power it makes on 98 octane.

 

Haha in saying that, I have been driving a 70 something front wheel kw car to work for the past little bit :laughing:

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Did driving, did tuning, got the fuel mostly flat to redline, injdc went from about 50% to 80% at roughly the same boost level and afr. Looks like those cams and head are flowing a bit more now!

 

Also at a 110kph cruise it's using about 11L/100km now instead of about 10L/100km from before. Not the worst fuel economy hit hey?!

 

Still more tuning to do but I'll save that for the dyno.

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I figured I would get a good gain from the cams but I didn't expect to make that much on 98. It made 80kw more than last time on 98 but it has a couple of extra pounds in it now.

 

Full disclosure though, I added a couple of degrees of timing to get the 480. I then pulled it back from the ragged edge to where it is safe for beating on, and it made about 455 to 465 a few times.

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Here's the graph. I had to run it in 3rd to get a number as I was hitting a speed limiter in 4th and was too tardled to work out how to remove it. I disabled it in the vid block, changed it in the tune as well and zeroed out the ETC cut. Still didn't work but oh well. Also don't have the boost control dialled in so it's a bit wavy. Today was a fuel/sd map tuning day :declare:

 

O4QrRsl.jpg

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Ring that turkeys neck! I assume the speed limiter is in the pcm/tcm and not the dyno?
I'm not much help on speed limiters unless I want to kill myself on the highway and even then I'm sure the stock engine won't have the steam for 240kmh and 7000rpm... or will it!?

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The stock motor will get you plenty fast but revving it to 7 grand is asking for a bent rod or 3.

 

Considering the stock cams are done by 5500, 6000rpm is plenty for a stock motor.

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It depends what you want. They are expensive, use more fuel and aren't really needed until you're making in excess of 1000hp at the crank. You also lose a lot of low down and mid-range power with the ones I got. I've lost about 150kw at 140kph in 4th gear.

 

I don't mind about the downsides though as it will be a monster when it's turned up for roll racing etc.

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Hey nice one Nath 

 

Good sound from the 218c’s 

 

Ha, exactly the above statement is true 100% and many of us Barra tuners say the same thing with cams.... the trade off really needs to justify that top target goal ! 
 

I’ve always steered customers away from cams that are above FG profile unless the target is a genuine 650rwkw plus ! As the downside’s just not rewarding as the ultimate top end number. 
 

Can’t wait to see you turn this up on E85 now ! 

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Thanks mate. Yeah those cams definitely tip the scales toward it being a race motor rather than a street motor. I can still make all the boost at 50kph in 2nd gear with antilag so it'll be ok for roll racing.

 

I've gotta chase a return restriction issue again, as the fuel pressure is to high and moving around. I must have kinked the hose or something as it was fine before I did the head etc.

 

After that I will fix the fuel in the tune...again...while still on 98 and then send it on e85. I've got numbers in mind but I'll let the dyno do the talking when it comes time.

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So for anyone who missed it, I modded my stock fuel rail a while back to feed from each end and return from the middle via a Turbosmart fpr2000. I used the quick connect from another rail and the little doodle hanging from it and welded that to the reg end to get a dual feed rail.

 

With the twin 525 intank pumps, both with separate battery/relay feeds I could still get a minimum of about 3.5 bar base pressure. This is great as the tune I use has a 4 bar base.

 

Before I took it apart for the head porting etc, the fuel pressure was stable at 4 bar and would rise 1:1 with boost. Now for no apparent reason it has decided that 6 bar is the new minimum. I've checked that there are no kinks and the lines are hooked up correctly.

 

At this stage it looks like I'll be taking the fuel system apart for checking, and maybe organize a proper sized return and drop the tank on Saturday.

 

Oh well ya get that sometimes :crazystuff:

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Fuel filter full of crud, reg on the fritz or the return has a blockage?
Wouldn't be a tig weld ball slag on the inside of the oem fuel rail has come off and ruined your day?
Did you say you have the pumps staged via a hobbs switch or both going flat stick permanently?
I'm obviously spit balling here...

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I'm gonna run the return from the quick connect into a jerry can and see what it does. If it goes low it'll be a hardline to the fuel pot restriction and if it stays high it'll be a reg/line issue up there.

 

Both pumps are on all the time and I should really stage them. It would be just as quick to set up a pinout and stage them as it would be to modify the return.

 

Haha I was really hoping to not pull the fuel tank out again, but at least I extended all the wiring so it comes out easily.

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Hope it's an easy diagnosis then. If you do the return then you know it's done but I'm hearing you about the fuel tank. I still haven't dropped mine for the first time and I'm dreading it... Still unsure of what I want my end goal to be which will likely end up bigger than planned as always!
I don't have the cash for a built engine or the man power to do it these days anyway, that's why your build and others is good for me. Almost like I'm along for the ride plus I gain some knowledge to...

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Well I just did the test I said I was going to do and the fuel pressure dropped. I set it back to 4 bar as I had been fiddling with it and it was slightly under.

 

That means the restriction is after the quick connect, towards the tank.

 

Now it's beer time :drinks:

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The fuel pressure is too high so this points to a return restriction.

 

If the filter was blocked or the hoses were split it would restrict supply :happyfriends:

 

Fwiw I used proper expensive ass intank fuel hose rated for all the pressure, when I installed the pumps.

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