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Discussion Starter #1
I have got a few questions regarding the Boss 260-290.

How many km has your Boss clocked up
Does the Boss like to rev pass 5500rpm
Does the Boss Motor have as much top end speed as the GEN III V8
What modes have you done to it.

The reason I am asking these question is because I want to know how the Boss 260-290 motor s go after wearing in.
 

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Discussion Starter #3
Daves8 . Does the motor go alot better now than when you first bought it. I bet the car sounds really nice. Motor mag keep on saying that the Boss motor dont like to rev. I dont know what they are on about.
 

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I've done 8000 k's now and the difference between now and when I picked it up is like night and day. They feel like slugs when new and really need at least 3000k's before they really start to loosen up but it keeps getting better up until what i've done now. The exhaust note keeps getting better too. You could barely hear it at idle when I first got it but it sounds pretty beefy now, although it could always be louder. They love to rev too, really seems to come on past 3500rpm.
 

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I've done nearly 12500km's in my xr8 ute and it's loosened up a lot since new. It really revs up quickly, and especially in 1st you find yourself having to grab cogs quickly to avoid hitting the limiter. It really hits another level once you past 4000rpm till just about when the limiter comes in, and the feeling is great, especially winding out in 2nd and 3rd!

As far as relative top end speed compared with the GEN 3, i can go from experience on the LS1 cruise nights i regularly go on. The LS1's are a bloody fast engine once they get into their rev range and dont back off. If they have edit done it takes the disadvantage they have stock away which is lack of low down torque.

The note to the Boss engines are one of the best i've heard. They are pretty good stock, but a decent exhaust mod will really bring out the grunty sound of it.
I think the Boss 260/290 will be a bit like good wine- better with age!
 

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I went past 20,000K's on the weekend whilst returning from the Gold Coast back to Sydney, the car changed yet again and all you guys with less K's have something again to look forward too, it seems to have remapped as I have heard suggested before. On the trip up and until I passed 20,000k's the car was doing 12.3l/100 average for each tank, after the 20,000ks I filled up and that tank did 10.6l/100 until I got back home, that is amazing from a 330+kw engine. Like all Boss engines it loves to get to the rev limiter very quickly and just ask the AUIII Pursuit Ute Guy with the 300+kw sticker on the back how much quicker the GT goes from 110 to 170 than the windsor, made him look a little stupid, he stuffed around speeding up and slowing down in front and everytime he moved over and I went to go past at a modest speed he accelerated off like a dick head then back to 100-115 in the 110 zone giving me the shits, so after the 4th time I slowed as I started to pass and he looked at me and started to accelerate and I floored it and left him 2 car lengths back at 170, then I let go as there was traffic in front of us but he wanted to get back past so kept going, then he settled back in front thinking he was king shit but the point had been made and he kept a constant speed of 120 after that until Newcastle where I went Pacific and he went New England
 

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I have 21,500 ks up now and The 290 has never gone harder!... I did not feel any noticable change at 20,000 though. 10,000 definately did!
 

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Charliewool said:
I have 21,500 ks up now and The 290 has never gone harder!... I did not feel any noticable change at 20,000 though. 10,000 definately did!
I'll agree with that Charliewool, I didn't feel any change at 20,000, at least it wasn't like the change at 10,000 which was easily noticed, but the fuel economy change was very evident and it idles better, whether the car now knows that the Herrod Exhaust has been fitted and has changed the idle timing as the exhaust got fitted at 14,000, I don't know but the idle and fuel economy are much better
 

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Just done 10,000. What a dream. I agree with newgtowner:

Who ever said the boss won't rev needs to change the supplier of what ever it is there smoking!!
 

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So is it confirmed that it remapps itself at 10,000 kms?
I spoke to my service manager today, he seemed to think it will not change.
I have had a ts1 module fitted, will the change still affect my engine (hope so!)
 

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The car setup is not really "changed" anywhere at exactly 10,000 klms.

You have missed the point.

The car gradularly get free er and free er as the klms are added on. When you get near 10,000 klms, the performance difference from new is stunning. It can be hard to tell the difference if you take 5 years to do 10,000 klms, but I did my first 3,000 in 3 weeks and still remember how the car drove.

Admittedly, as we get used to the car, we give it more - especially after it is run in, and it answers better. Argueably, there is no difference but we drive it better.

I tend to believe that the real performance gain is the engine "loosening up" and revving even better!!

Anyone want to comment?
 

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I've got a lot to look forward to it as mine has only done just over 4,000klm already impressed though they just keep on getting better.
Cheers John
 

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eightoftwelve said:
The car setup is not really "changed" anywhere at exactly 10,000 klms.

You have missed the point.

The car gradularly get free er and free er as the klms are added on. When you get near 10,000 klms, the performance difference from new is stunning. It can be hard to tell the difference if you take 5 years to do 10,000 klms, but I did my first 3,000 in 3 weeks and still remember how the car drove.

Admittedly, as we get used to the car, we give it more - especially after it is run in, and it answers better. Argueably, there is no difference but we drive it better.

I tend to believe that the real performance gain is the engine "loosening up" and revving even better!!

Anyone want to comment?
No i have not missed the point, i realise the general theme of this thread is dedicated to the "loosening up" of the engine over a time period.
If you read others threads you will notice some have commented on the fact their engine dynamics change at exactly 10,000 kms
Some i can remember were DGROMS and GTP193 from memory
 

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Discussion Starter #15
Thanks for responding. I was wondering how they go after 10,000 km. I went for a ride in a silver BA XR8 with 56 km on the clock and it felt really slow. The Ford dealer said that an XR6 Turbo is faster than a GT.

I love my V8s So I though I might ask people on the Forum about their Boss V8. Keep replying people it is good to read
 

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Discussion Starter #16
Have any of yous changed the Cams in the Boss Motor. I bet the motor would go a lot better again.
 

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The huge boss DOHC heads are designed to breath and breath deeply. Unfortunately this fact can mask the torque they generate in the lower rev range, however once the engine’s rev build and the cam’s kick in they haul very hard. One of the best things you can do with these engines are to give them more air and the results can be quite impressive.

Obviously forced induction is where these engines really shine, however even a $500 induction kit from Herrods will make a noticable difference to even a stock motor. IMO if you don't want to spend big money on exhaust and other mods this induction improvement would have to be the best value for money investment in your 5.4.

After doing your induction upgrade I would not be surprised if that .4 or a second advantage the SS now was now dramatically reduced or even turned around. Not bad for $500 although I think they should have it from standard regardless.

Are you looking for a manual or auto V8 Elliot? If its auto I think you will find the Ford is a shaper tool than the SS in both drivability and performance.
 

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ELLIOT said:
The Ford dealer said that an XR6 Turbo is faster than a GT.
This statement is quite accurate.

The XR6 Turbo gets us on the 0 to 100 AND the quarter mile. I wish magazine writers would quote this when stating that the GT is slower than a clubby. I would not be suprised if an XR6 Turbo KILLS a clubby.

The difference between the XR6 Turbo and the GT (AND the clubby) is driveability. The GT has a massive weight penalty that is not solely engine created as some other posts hint. A lot of the weight is in the suspension.

Drive a XR6 Turbo then a GT and you will NEVER get in a XR6 Turbo again!!

I bet the clubby drives worse than the XR6 Turbo. Most magazine writers do clobber the clubby in driveability. Contrary to the baby adds, the crapadore is NOT built for cornering - well not like the GT anyway!!
 

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Discussion Starter #19
I wish I had the money for a new Barra but I can only dream. One of my firends parents were thinking about a XR8 but I think they are going to get a Turbo. I like the Turbo but I am a V8 Man.
 

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Discussion Starter #20
Also Does the US 5.4L DOHC V8 have the same size stroke. Which is 105.something. If so What do they do to their motors to make them rev to almost 8000rpm.
Thanks
 
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