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more power, slower 1/4 

 

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Posted: Wed Jan 19, 2005 11:15 am 
Getting Side Ways
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Is the DEV 4 a simular grind to the XR cam?
I thought it would have been more agressive?

 

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Posted: Wed Jan 19, 2005 12:29 pm 
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From what I have seen on a dyno an XR6 cam in a modded ecu (unichip) and exhaust AU will give around 140rwkw. Thats about the same as you will get with the dev3hl or dev4 with exhaust but no head mods. I have heard of AU XR6's though with extractors and no ecu only getting 125-135 rwkw too though.
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Posted: Wed Jan 19, 2005 2:09 pm 
Getting Side Ways
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USELESS wrote:
Bozz wrote:
This is exactly the problem many people have because they think every last KW will make the car faster when in reality a car can be tuned to have 10% less power and yet do the quarter 5% quicker. How? Its all about torque and power spread and the driver to a lesser extent. For example if you have 90% of your maximum torque available throughout over 50% of the rev range, the car will be MUCH quicker than one that has 90% of the torque available over 20% of the rev range but 20-30% more peak power.

The problem is people think they need more power. Its not as simple as that.


What he said!!! Stick the standard cam back in.The most imoportant thing is to maximise power down low not at the 500 rpm up top

Im goin to test your theory.
I have a new cam which gave me a extra 15hp and 12nm, will run down strip n see. Peaks at 5200rpm

 

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Posted: Wed Jan 19, 2005 5:53 pm 
Parts Gopher
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USELESS wrote:
Bozz wrote:
This is exactly the problem many people have because they think every last KW will make the car faster when in reality a car can be tuned to have 10% less power and yet do the quarter 5% quicker. How? Its all about torque and power spread and the driver to a lesser extent. For example if you have 90% of your maximum torque available throughout over 50% of the rev range, the car will be MUCH quicker than one that has 90% of the torque available over 20% of the rev range but 20-30% more peak power.

The problem is people think they need more power. Its not as simple as that.


What he said!!! Stick the standard cam back in.The most imoportant thing is to maximise power down low not at the 500 rpm up top



well i could swap my cams bak, not an xr so i dont realy wanta. plus i like the idle not with a beefy cam. hehehe. and it wouldnt get me anywere.

now if i was 2 put on a higher ratio diff and a 3000 stally then i would be able 2 keep the power and fly through the weak spot of the cam and into the higher torque area. would work better wont it?

 

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Posted: Wed Jan 19, 2005 8:59 pm 
Getting Side Ways
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correct
With a tuned N/A car, you want to be up in the revs as much as possible, as most the power is there.

 

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Posted: Wed Jan 19, 2005 9:40 pm 
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i remember my dad telling me about one of his mates when they were about 25 (bout 25 years ago) bought a one tonner with a big block chev.. anyway it was in the garage for a year always getn talked about how fast it was gonna be etc.. finaly after spending over 6 grand on this motor which was a fair bit back then it went half a second slower!

broke his heart and his pride!.... shoulda bought a ford was all i had to say!

 

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Posted: Wed Jan 19, 2005 9:43 pm 
Getting Side Ways
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yeah, ive heared storys like that too.... :(
Not cool
But it come down to what the money is spent on

A mate spent a few grand on a ss VX and 2 days later blew it up, went slower then :D

 

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Posted: Thu Jan 20, 2005 12:42 pm 
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Power: 175 rwkw

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How does the car feel to drive generally after the new cam ?

I threw an auto wade 2 in my tired manual EF, didn't dial it in or anything and a few weeks later ran a 14.8. Single spinner diff, launch at about 2000 rpm with a touch of wheelspin/chirp and not flat changing. I never ran it before the cam/extractors but that's about a 1 second improvement over stock times.

I assume if you did 15 runs you can rule out being a s**t driver (or atleast one would hope) :)
Was it a hotter day or something ? You have a big lunch just before hand ? :P

 

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Posted: Thu Jan 20, 2005 4:19 pm 
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track telp was 30.
in gerenal it nails all ova the stock cam.

yeh its also about matching parts not just putting what eva u want it.

 

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