purxr6t Member 37 Member For: 4y 11m 24d Posted 23/02/24 01:08 PM Share Posted 23/02/24 01:08 PM Hi recently purchased a 700+Rwkw Barra, It is supposed to have Atomic stage 4.5 cams possibly stage 5, And possibly locked timing gears. It has low vacuum and very heavy brake pedal at idle or in heavy traffic, Is this normal? Has anyone found a solution? Whether it be less overlap, Or vacuum pump etc? As it is in heavy traffic the brake pedal is like a rock, And it's would be good to sort it out. Cheers. Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/ Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 16,303 Member For: 10y 2m 30d Gender: Male Location: South Australia Posted 23/02/24 01:17 PM Share Posted 23/02/24 01:17 PM That's what happens with big cams. The brake booster will store vacuum on decel and a little bit at idle, you can drive around it like this. I never bothered with trying to fix it, I just press the pedal harder, you get used to it. I'm sure you could fit a vacuum pump and it would be sweet. If the cams are locked, there's fark all you can do about it without changing your power band and needing a retune. 1 Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722194 Share on other sites More sharing options...
purxr6t Member 37 Member For: 4y 11m 24d Posted 23/02/24 01:58 PM Author Share Posted 23/02/24 01:58 PM Any good tuners you would recommend in Brisbane? Who can also do a good ZF tune so it drives normally in "D"? It can be a bit rough and erratic at some speeds, For example either shifts up and down, Or convertor lock up engages / disengages at some speeds, 40 kmh is one of those, and it gets annoying manually shifting all the time. The power is there it could just do with some refining here and there. Has a Haltech plug in, With flex fuel mainly on E85 at the moment. I think the idle could be better, And for sure the ZF could be tuned a lot nicer !!!! Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722196 Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 16,303 Member For: 10y 2m 30d Gender: Male Location: South Australia Posted 23/02/24 11:44 PM Share Posted 23/02/24 11:44 PM Same as your other post, I'm not from there and don't really take note of who does what, you'd have to ring around or whatever. Again same as the other post, can you pull the tcm file and reflash it? Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722199 Share on other sites More sharing options...
purxr6t Member 37 Member For: 4y 11m 24d Posted 25/02/24 06:02 AM Author Share Posted 25/02/24 06:02 AM Yeah will get PCM Tech if needed, Otherwise if there's any places people from Brisbane can recommend, That have done some big power ZF tunes that would be great !!!! I mean they should already have PCM Tech and a near off the shelf tune ready to go. Weird that there's only a fault after half an hour or so of driving in "D" though. Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722221 Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 16,303 Member For: 10y 2m 30d Gender: Male Location: South Australia Posted 25/02/24 07:06 AM Share Posted 25/02/24 07:06 AM Use Forscan and see what code is being logged. It's free to download and you'll need a tactrix cable or similar to plug in. Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722223 Share on other sites More sharing options...
purxr6t Member 37 Member For: 4y 11m 24d Posted 25/02/24 07:22 AM Author Share Posted 25/02/24 07:22 AM No worries, that sounds like a good Idea, Will try to get a tactrix cable ASAP. Cheers. Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722224 Share on other sites More sharing options...
Tom Tucker Donating Members 702 Member For: 5y 9m 29d Posted 25/02/24 09:34 AM Share Posted 25/02/24 09:34 AM You might have to look at Force Performance in Toowoomba man. When I was in Brisbane, East Coast Customs did a lot of work on my car, and they deal with barras a lot. Not sure if they have a ZF transmission specialist though. 2 Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722226 Share on other sites More sharing options...
purxr6t Member 37 Member For: 4y 11m 24d Posted 26/02/24 03:45 AM Author Share Posted 26/02/24 03:45 AM Yeah that is one of the shops the previous owner took it to. Also some of the other well known names like Real Dyno etc.... Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722236 Share on other sites More sharing options...
Gaz084 Member 51 Member For: 10y 8m 22d Posted 27/02/24 05:56 AM Share Posted 27/02/24 05:56 AM They put a vacuum canister in for my stage 5 crow cams...did the job and a very simple fix. Before that when the idle was low, pulling up to a car Infront of me was dangerous, braking suffered under the right conditions. 1 Link to comment https://www.fordxr6turbo.com/forum/topic/97203-low-vacuum-with-big-cams/#findComment-1722255 Share on other sites More sharing options...
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