crawfo Member 4 Member For: 13y 3m 9d Posted 01/12/11 05:57 AM Share Posted 01/12/11 05:57 AM I have a ba xr6t ute with forged pistons and steel rods and it runs around 17psi and when in 1st gear and sometimes 2nd gear if you flatten it, it will rev out really quickly and hits the limiter and for the next 15 or so seconds it will miss and run really bad and if you let the revs drop down to idle it will stall and then takes a wheil to restart like takes heaps of cranking to start. is there bad and is there anyways to fix this? I try not to hit the limiter but because it revs so fast its hard to avoid. Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 1m 3d Gender: Male Location: Perth Posted 01/12/11 07:02 AM Share Posted 01/12/11 07:02 AM Valve springs Link to comment Share on other sites More sharing options...
JVK Silver Donating Members 751 Member For: 18y 11m 12d Gender: Male Location: North West Hot Hell,VIC Posted 02/12/11 01:07 AM Share Posted 02/12/11 01:07 AM I agree with arronm more than likely valvesprings. Link to comment Share on other sites More sharing options...
Tobey Awesome... Member 407 Member For: 14y 4m 25d Gender: Male Posted 02/12/11 02:06 AM Share Posted 02/12/11 02:06 AM Link to comment Share on other sites More sharing options...
Boganspeed Will do skids for food Silver Donating Members 1,177 Member For: 13y 25d Gender: Male Location: Perth SOR Posted 02/12/11 03:21 PM Share Posted 02/12/11 03:21 PM Can someone explain the valve spring theory ? Link to comment Share on other sites More sharing options...
Wenier Donating Members 1,736 Member For: 14y 10m 12d Gender: Male Location: Christchurch, New Zealand Posted 02/12/11 07:12 PM Share Posted 02/12/11 07:12 PM As in valve float, only happens in the high rpm and will make it go really flat until the springs get back to working again.The spring weight isnt enough to do there thing when making that extra power and that rpm. Link to comment Share on other sites More sharing options...
crawfo Member 4 Member For: 13y 3m 9d Posted 12/12/11 11:16 AM Author Share Posted 12/12/11 11:16 AM ok so is there any way to tell if they are aftermarket valve springs or standard as I bought the ute with all the mods already done to it. and also when it does start to miss and carry on it like lasts for a fair while and if let to idle and it stalls it takes a lot of winding over for it to fire again like 5 or more times the normal cranking time. Link to comment Share on other sites More sharing options...
Boganspeed Will do skids for food Silver Donating Members 1,177 Member For: 13y 25d Gender: Male Location: Perth SOR Posted 13/12/11 09:15 PM Share Posted 13/12/11 09:15 PM So I understand what valve bounce is, hell I've done it a few times myself before rev limiters were invented.But how does that make it hard to restart the car? Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 2m 6d Gender: Male Location: Perth Posted 13/12/11 11:44 PM Share Posted 13/12/11 11:44 PM Lifters pump up during valve bounce, on restart the valves are still partially opening causing hard start Link to comment Share on other sites More sharing options...
phantom xr6t Talks Cheap, Let's Race Member 596 Member For: 18y 14d Gender: Male Location: Atherton, FNQ Posted 14/12/11 08:55 AM Share Posted 14/12/11 08:55 AM I had new valve springs put in my car in 2010 and last month it started suffering from valve float, so sometimes better springs can break down after some time. My car only tuned to 400 RWHP on 15 psi, going to get atomic springs this time. Link to comment Share on other sites More sharing options...
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