High mileage ACERT owners

What sort of temps are you running the truck in? I mean outside air temp.
I can easy get my exhaust temps up to 650C (1200F), with a load on.
I am only seeing 60 - 65 psi boost pressure. Now I put the fuel wire back on it's a bit faster. But I ALWAYS use full throttle. Up until the exhaust temps start to climb.
I am running average 30 c air temp (It' s summer over here!)
Maybe that makes a bigger difference than we realise?

water temps are under control now thanks to the lower thermostats

There are quite a few fast trucks over here when you start looking, and an extra 100 or so hp doesn't make the truck that much faster.

That's why Jas is always up against it. He can only give so much extra power and soon you are used to it and looking for more!

I don't use my truck much so it always makes me smile when I take her for a spin!!

Tony

 

The outside temps here are about 5-45F. The winter weather has been kinda unpredictableand the temps swings have been even more. Like I said earlier the highest EGT I have seen was about 900F and that was on a 35F day weighing in at about 81,000 LBS with a beer load. After Paul E and I discussed at great legnths about the tune, fuel wire, and injection duration times I took the fuel wire off and I'm gonna run the truck a few weeks to see if theres any difference with the current setup. My water and oil temps will of course start to climb when I'm under a long pull, but so far they have more than manageable with the manual control of the fan.

I am looking for more HP/TQ...just not for everyday driving. I want it for the sled pulls and maybe a couple of chances at the dyno (mostly for the pulls though). I think my next step is gonna be looking for a different set of injectors and balancing them like Farcall has described. Then I'll move onto the turbos which I'm sure I will have to do at that point. To be honest I'm kinda jealous of you Aussies. With Jas and Farcall basically in your own back yard the ACERT modifications have become pretty common. There just aren't that many people here in the states that want to modify or even look at a ACERT. Everybody just says to de-ACERT the motor and thats it...I don't think that is the correct solution. So finding someone with the ability to do the work I can't and understand my thinking is pretty hard.

 

i went for a run today. Pulling a bdouble up a few km long hilll near home, not full. prob about 53 ton (115k lbs).

Exhauet temps hit 650, just.

The only reason they stopped rising was the hill stopped.

outside temps where 34 c Not sure what that is , but must be up near 100F.

I already have Farcall's injector mods to the acert injectors, and the std Bully Dog tune. in a 550hp.

He is worried that the engine many not be able to stand much more power as it is starting as a very high compression engine.

I have a std clutch 2050ftlb and an 1850 gbox and diffs.

I would not be worried about the clutch as I'm not scared to push pretty hard and have pulled up to 138k lbs

The engine also pushes as much black smoke as I would like.
Being a no polution type engine i don't want to draw too much attn to myself.

If you do Farcalls injector mods, I have just about found the limit to how far you can go. The engine will hunt at idle and you can't really get rid of it.
The idle is bumped up as high as it can, with the A/c on is runs good. But with it off it will hunt at the lights when you pull up.

If you talk to Farcal and between he and I we can give you the best numbers.

My suggestion would be to do the inj mod and then run the std Bully dog tune and fuel wire. (like me).
Then put in the 800hp tune for the sled pulls.

That way the truck will be about what you have now, or a bit less for everyday use.

Use the Gun Tune just when it matters.

Hopefully the turbo will be Ok.
The head gaskets would be my next worry.
Also change the oil a bit more often as Jas thinks the big ends won't like the power for long periods.

Good luck with it all.

PS I am about the only one out here stupid enough to test the limits of the acert. Most poeple just want to drive the things, just like over there.

Jas and Farcall are also very rare as well. Smart guys with experience and are willing to help when they can

 

I was just reading the thread and saw I posted fuel mileage at 6.3. I must update that and say that now pulling a 53 ft van I'm getting 5.5 due to poor aero setup. Probably no one cares but I want to be correct in what I post.

 

34' C =about 93' F. 1.8 times temp then add 32' to get conversion. Learned that crap in Iraq. Saw it 54' c a few times.

 

Very interesting!

The weather man said it was actually top of 37C, and I was on the road at 1.30pm so thats about 98.6F

Tony

 

Thanks for the kind words guys.
Tony, glad to hear the coolant temp has been rectified somewhat, I think pulling the sound suppression of the sump probably helped a lot too, you'd be suprised how much heat can escape though there now.
Been thinking about your high EGTs and you may be at the limit of the intake system on your truck, if you have a look at the intake elbow into the low pressure turbo you will see its this crazy shaped cast iron piece molded to clear the steering shaft, the inlet to it is 5 inch diameter (from memory) the turbo inlet is the same but that elbow necks down to almost half that where it gose past the steering shaft. Where as most other trucks (petes, KWs, etc) have a normal 5 inch standard radius elbow going onto the turbo.
Your air filter restriction gauge measures off the crossover between the air fitlers so it will not show the restriction thats furthur down stream. Maybe worth investigating as a lack of air would explain the high EGTs and low boost compared to pullingtrucker who has a similar set up to you.

 

Is it hunting with the standard program also? Like I said earlier that sounds like an amateur ECM tuner program.

And it shouldn't smoke under load if done right.

 

Its kinda hard to match a mail order tune to modified injectors and make it all work without smoke. The hunt is to do with the injectors not the tune, a custom tune written for that truck to match the injectors could probably tune it out but at the moment at least that kind of thing isnt possible.

 

How much bigger the injectors are now? Only "trimming" them can't do wonders, ECM should be able to handle them. But if ECM software is done "add 30% to everything"-way, it also adds 30% to "gap" between 0 and idle fuel rate.

I wonder why Aussies are not able to do programming? You were the pioneers of low buck stand alone systems for gasoline engines. There is a couple of companies in Europe doing the map search and checksum calculation for almost any ECM, use their services and start doing ECM tuning locally.