Advance or Retard the cam?
Discussion
ciao a tutti,
i have a complete kit Comp-Cam with the Possibility to adjust the advance or retard from a minimum of 6 ° to a maximum of 6 °
Here I would ask you if someone has tried.
I use my GTR on the track and then try more hp
... with 7000rpm max.
I have already moved to the 1° retard and it seems that the gtr beyond 4500rpm ,rise more rpm faster.
At low rpm I have not noticed any difference.
Researching more hp ... I wanted to push myself to the maximum position: retard 6°.
what do you think please?
thank you .
ste
i have a complete kit Comp-Cam with the Possibility to adjust the advance or retard from a minimum of 6 ° to a maximum of 6 °
Here I would ask you if someone has tried.
I use my GTR on the track and then try more hp
... with 7000rpm max.I have already moved to the 1° retard and it seems that the gtr beyond 4500rpm ,rise more rpm faster.
At low rpm I have not noticed any difference.
Researching more hp ... I wanted to push myself to the maximum position: retard 6°.
what do you think please?
thank you .
ste
ciao Will, i have L98: 6000cc (ls2) with head Ls3.
modifies: injector 65lbh, megasquirt, edelbrok intake, comp cam 231/237 .592 / .599 112 (max rpm 7200),exaust inox high.
I seek more hp at high speeds.
I do not care to lose NM at low rpm (the original has already much Nm at lower).
+ Nm at high rpm = + hp tot.
in USA recommended to anticipate the 4/6 ° but they seek NM at low.
I want the opposite: so I have to retard.
But how many degrees?
no one has tried.?
my kit includes an adjustable pulley 6 positions: + 6 ° / -6 °
tks
modifies: injector 65lbh, megasquirt, edelbrok intake, comp cam 231/237 .592 / .599 112 (max rpm 7200),exaust inox high.
I seek more hp at high speeds.
I do not care to lose NM at low rpm (the original has already much Nm at lower).
+ Nm at high rpm = + hp tot.
in USA recommended to anticipate the 4/6 ° but they seek NM at low.
I want the opposite: so I have to retard.
But how many degrees?
no one has tried.?
my kit includes an adjustable pulley 6 positions: + 6 ° / -6 °
tks
ciao Dom,
I thought that the high collectors as mine were the best choice.
the bandages are used because there is always Too much heat under the clam.
the muffler that you see it on the inside has a "X" system.
in the past I tried (without muffler) systems with H and X pipes but only changed the sound and not the performance.
I believe that by varying the phase, I can squeeze out the last hp of my engine.
I have felt a big difference performance and sound from +4 to -2.
It is a mathematical formula i believe: NM at +rpm= +hp?
Advance: +NM at low rpm but - hp
retard: -NM but much hp at high rpm
but here, nobody has tried to vary the phase ???
ciao HUMBLE: yes but but if I put a Cam more aggressive, then I have problems with minimal and certainly lose NM at low rpm.
ie in the street is no longer "manageable", because as also says F.C. ,Unfortunately, the cam is only one.
in any case in the USA is a modifie that many do, and I read that may vary thirty hp ,and especially the mode of dispense.
I thought that the high collectors as mine were the best choice.
the bandages are used because there is always Too much heat under the clam.
the muffler that you see it on the inside has a "X" system.
in the past I tried (without muffler) systems with H and X pipes but only changed the sound and not the performance.
I believe that by varying the phase, I can squeeze out the last hp of my engine.
I have felt a big difference performance and sound from +4 to -2.
It is a mathematical formula i believe: NM at +rpm= +hp?
Advance: +NM at low rpm but - hp
retard: -NM but much hp at high rpm
but here, nobody has tried to vary the phase ???
ciao HUMBLE: yes but but if I put a Cam more aggressive, then I have problems with minimal and certainly lose NM at low rpm.
ie in the street is no longer "manageable", because as also says F.C. ,Unfortunately, the cam is only one.
in any case in the USA is a modifie that many do, and I read that may vary thirty hp ,and especially the mode of dispense.
Edited by 845ste on Thursday 16th March 21:06
ok I understand.
very kind of you all and thank you precious advice for the exhaust system.
But no one has done tests by varying the phase with an aggressive cam ....
Dom can put a picture of your exhaust system please?
I see that Lee (yellow GTR) has built a different system by all, with a single final output.
very kind of you all and thank you precious advice for the exhaust system.
But no one has done tests by varying the phase with an aggressive cam ....
Dom can put a picture of your exhaust system please?
I see that Lee (yellow GTR) has built a different system by all, with a single final output.
confusionhunter said:
Yea... Bottom line you probably need to try it and see. For us with single cam V8s, Inlet theory cannot be implemented in isolation, ie its always a balance between inlet and exhaust. The disadvantage of a single cam is you cant alter inlet to exhaust timing. Overlap is set and there is sod all you can do about it short of a regrind or new cam.
This article shows a single cam V8 making more power with 4 degrees advance over 0 degrees straight up.
http://www.hotrod.com/articles/mopp-1211-degreeing...
you need to look at the pictures for the results. 'By Advancing The Camshaft Four Degrees, We Ended Up With 329 Hp And 320 Lb Ft Of Torque. That's An Increase Of 8 Hp And 16 Lb Ft Of Torque'
However I agree with the theory of retarding the inlet higher up. For example Audi advances the inlet only at more than 80% throttle and between 1k and 4k revs on their VVC twin cam cars, meaning on a pull at 100% throttle it retards the inlets again above 4k revs.
Oh and also Comp cams do actually generalisethe other way.... retard means more HP up top.... so forget what I said
http://www.compcams.com/Pages/413/cam-timing-lobe-...
So its all clear as mud
Confusion: yhanks but i I can not seem to open it:http://www.hotrod.com/articles/mopp-1211-degreeing...This article shows a single cam V8 making more power with 4 degrees advance over 0 degrees straight up.
http://www.hotrod.com/articles/mopp-1211-degreeing...
you need to look at the pictures for the results. 'By Advancing The Camshaft Four Degrees, We Ended Up With 329 Hp And 320 Lb Ft Of Torque. That's An Increase Of 8 Hp And 16 Lb Ft Of Torque'
However I agree with the theory of retarding the inlet higher up. For example Audi advances the inlet only at more than 80% throttle and between 1k and 4k revs on their VVC twin cam cars, meaning on a pull at 100% throttle it retards the inlets again above 4k revs.
Oh and also Comp cams do actually generalisethe other way.... retard means more HP up top.... so forget what I said
http://www.compcams.com/Pages/413/cam-timing-lobe-...
So its all clear as mud
Edited by confusionhunter on Wednesday 22 March 13:49
I realized that maybe I can gain a few HP (about about ten?)....
or i change with more agressive cam...
now my gtr with semislick, have problem with traction in 1 and 2 gear....
vey interesting.
Dom I'm curious to hear sound that F1 has your gtr ..
I seem to see that you have the mufflers (one each cylinder bank) towards the exhaust end?
please post some video of acceleration.
I seem to remember wich also the the yellow Lee's GTR sounded like a F1, with exaust system similar yours
Dom I'm curious to hear sound that F1 has your gtr ..
I seem to see that you have the mufflers (one each cylinder bank) towards the exhaust end?
please post some video of acceleration.
I seem to remember wich also the the yellow Lee's GTR sounded like a F1, with exaust system similar yours
Dom yours GTR have a right sound! 
mine: https://www.youtube.com/watch?v=upIRQ_oBIys
but please, your system exaust have 2 muffler (each for 1 part) or is direct?
mine: https://www.youtube.com/watch?v=upIRQ_oBIys
but please, your system exaust have 2 muffler (each for 1 part) or is direct?
always raining in the UK ..... I ask myself how do aad have shiny and clean cars forever.
Dom seems a good sound but you should make a nice video acceleration from standstill to hear better.
For cam question, thank you all.
I want to try to retard as soon as I have some time.,
If we are interested ,I will update or if someone will do it before, I hope you tell us here, please.
Dom seems a good sound but you should make a nice video acceleration from standstill to hear better.
For cam question, thank you all.
I want to try to retard as soon as I have some time.,
If we are interested ,I will update or if someone will do it before, I hope you tell us here, please.
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