BigMoscow Member 45 Member For: 8y 8m Posted 17/06/16 06:09 AM Author Share Posted 17/06/16 06:09 AM So I hear that after a short period of time, doffs start to move around on powered up sedans. Is it true and what's the cure? Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 12y 8m 26d Gender: Male Location: Central Coast Posted 17/06/16 06:29 AM Share Posted 17/06/16 06:29 AM Lift is good but I'm not a fan of greater duration The stock fg cam and head has been into the 8s now Dunno why you would want to play around with it I'm a huge fan of more boost for more power rather than changing the characteristics of the engine Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 7d Gender: Male Location: Perth Posted 17/06/16 06:32 AM Share Posted 17/06/16 06:32 AM Have you thought about the overall effect on effective duration caused by the duo phasing on the FG cams? Link to comment Share on other sites More sharing options...
sixman Donating Members 600 Member For: 20y 6m 8d Gender: Male Location: Hills District, NSW Posted 17/06/16 08:58 AM Share Posted 17/06/16 08:58 AM Was it cms who had some cams a while ago with big power gains? Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 7m 30d Gender: Male Location: Adelaide Posted 17/06/16 09:24 AM Share Posted 17/06/16 09:24 AM Someone say camms boy these were cops but sounded sweet I have a video of it blowing condensation rings somewhere still don't have love for cams in these car's 1 Link to comment Share on other sites More sharing options...
HI PSI Member 1,586 Member For: 18y 8m 6d Gender: Male Location: Central Queensland Posted 17/06/16 09:43 AM Share Posted 17/06/16 09:43 AM (edited) On 15/06/2016 at 10:15 AM, mightbuyaford said: in short lift will increase power without the change of duration the power increase will be somewhat the same power curve as previous. Duration is what changes the ramp of the power. Depending on the duration of the cam will depend on what rpm the curve will change. In a turbo car you want over lap and bigger duration/lift as it helps push the exhaust gas out the motor faster therefore increasing power output I believe, and correct me if I'm wrong. Increasing the overlap in a turbocharged car is detrimental to making power. You are correct when you say that opening the inlet valve earlier, assists in removing the exhaust gas from the cylinder. But in a turbo charged engine the cool air entering the cylinder earlier . reduces the exhaust gas temperature. This in turn reduces the efficiency of the exhaust gas on the turbine wheel and housing.. This is referred to as "Turbo Chill". This is not the article that I sourced this information from, but it explains the effect.... CLICK HERE Forgot the link. Silly me... Edited 17/06/16 09:45 AM by HI PSI Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 7d Gender: Male Location: Perth Posted 17/06/16 10:37 AM Share Posted 17/06/16 10:37 AM turbo and chill? :wink: 2 Link to comment Share on other sites More sharing options...
BigMoscow Member 45 Member For: 8y 8m Posted 20/06/16 12:57 AM Author Share Posted 20/06/16 12:57 AM (edited) On 17 June 2016 at 2:29 PM, MattyP said: Lift is good but I'm not a fan of greater duration The stock fg cam and head has been into the 8s now Dunno why you would want to play around with it I'm a huge fan of more boost for more power rather than changing the characteristics of the engine Big boost would be fine if e85 was readily available. Currently I have to stay with 98ron. So big boost is too risky. In time, I'm sure e85 will be everywhere and I'll have the $$$ for a forged bottom end. As for going into the 8s. This is my daily driver. I have been in some 9 second cars. Both gtrs and big v8s. They all had one big problem. I would never drive them daily. Edited 20/06/16 12:58 AM by BigMoscow Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 12y 8m 26d Gender: Male Location: Central Coast Posted 20/06/16 01:01 AM Share Posted 20/06/16 01:01 AM Lucky for us our cars aren't gtrs or huge v8s If you do the mods properly these cars are incredibly streetable Many 10 second dailys floating around. The stock cam is one of the reasons for this. It flows very well and is well mannered and efficient at cruise Big boost is fine on 98 as well Just add water injection Link to comment Share on other sites More sharing options...
BigMoscow Member 45 Member For: 8y 8m Posted 20/06/16 02:52 AM Author Share Posted 20/06/16 02:52 AM There is a huge difference between in drivability of a 10sec car and a 9sec car, let alone 8. I am sure that with practice, I will run 10s. As as for boost levels, this is where every person will be different. I get the general idea that going over 25psi is starting to push the internals. Cams will ill be the very last item to go in. So I will be able to post a direct comparison between pre and post cam shafts. If time and money permit, I will post some pre and post time slips also. I just can't see how they would make the car worse. They are also one of the cheapest items on the list. Link to comment Share on other sites More sharing options...
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