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VL Commodore

HIGH COMP who is the fastest?

Started by AFG-WPN · 10 Aug 2007 · 416 replies

Preserved from CalaisTurbo (partial recovery). Original authors and dates are shown; archived members are not current Holdcom accounts.

BourasArchived member
bass i got the 1522C/1147C its pretty huge lol duration is like 296 intake and 280 exhaust, and 504' lift lol...
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AFG-WPNArchived member
haha i know ay its big mofo of a cam. quick question nick, you gonna be driving the thing on the street? mine will be a weekender Some original photos have not been recovered yet.
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exbt1jetArchived member
Quote: Originally Posted by exchaser yeh. 1.575 is the quikest 60ft i've ever done in the car. its all standard rear end even the bushes are 20y/o etc. sometimes i wonder if that helps :P thats launching on 8-10psi. and even then i think i could have launched on 12or more without any issues with grip...car has 3200 convertor. It wont come down by much but im sure it'll come down a bit more than wat i ran wednesday night. Sometimes i give it a rev after the burnout to clear the plugs.. but wats with the hard on the brakes thing ?? when u say off the foorbrake. do u use the handbrake also? wat time and mph did u run.?. cause when i do mine, i rekon it'll be a 10.98@122mph :P cant race tonight cause im working. but hopully week after next i'll be back out to do it. from memory think i went 123mph, i wasn't getting much more than 10psi na no handbrake, i just mean just make sure your holding the brakes as hard as you can i had all standard 15 or so yr old suspension as well, only thing i did was put standard springs in rear to get slicks to fit under. u will get there, nice car to u have
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JVL87Archived member
thanks mate.. there's no doubt it'll piss a ten in with decent fuel (toluene)... but it will be a pretty decent achievement for me if i can do it on straight pump and my mt et streets.(drive to track, run a ten, and drive home)... thats all i want to do. even if its only once :P haha the cam im going to get is a tighe cam..not sure the exact grind but yeh its bit bigger than my 818... Ollie Some original photos have not been recovered yet.
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SkotArchived member
what headgasket do you fellas use on high comp engine?? just a standard vl turbo one or something else?
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HYPED6Archived member
Just to throw in an idea about hi comp and big boost on pump, wouldn't a more efficient camshaft create more cylinder air density thus needing less ignition timing to create the same brake means fuel consumption. Would this not be a tail chacing way to obtain power?
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BourasArchived member
yeah mate ill be driving till i get ****ed lolll
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exchaserArchived member
i think bigger cam, bleed off more cylinder pressure, allowing the use of more ignition timing to make more power at the same boost we're already at. if thats the simplified way of saying wat u just did, thats how i understand it. that is on the to do list... but might just crack a ten with the 818 and 338rwhp see next wednesday Some original photos have not been recovered yet.
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[T]MattyArchived member
Got my self a 6 coil seetup also, the dump is on and got a K&N filter. also got all new bushers for the ass end, And Adjustable upper arms.. Need to make the screamer next. Some original photos have not been recovered yet.
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6BOOSTArchived member
Quote: Originally Posted by exchaser i think bigger cam, bleed off more cylinder pressure, allowing the use of more ignition timing to make more power at the same boost we're already at. if thats the simplified way of saying wat u just did, thats how i understand it. that is on the to do list... but might just crack a ten with the 818 and 338rwhp see next wednesday You would be correct doodle. A bigger camshaft will do 2 things. It offers more lift and more duration, which itself will add more power, and due to the higher lift and more duration, will bleed off cylinder pressure down low where detonation will occur around peak torque. Cheers........................6BOOST Some original photos have not been recovered yet.
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RaptorArchived member
guys, i have my turbo coming back from the builders, highflow that is. 7psi ok? with all the stock stuff, will be bolting up the fuel reg, camming it and decomping very soon!
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benjipsiArchived member
yeah it will be fine uncooled if thats what your gettin at cam though depends if its compatible with stk ecu i believe this jpc stge2 is
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RB30-POWERArchived member
Quote: Originally Posted by 6BOOST You would be correct doodle. A bigger camshaft will do 2 things. It offers more lift and more duration, which itself will add more power, and due to the higher lift and more duration, will bleed off cylinder pressure down low where detonation will occur around peak torque. Cheers........................6BOOST What you also want is a cam that has a wide LSA if you want to lower average cylinder pressures and have less chance of detonation, the wider LSA will also result in wider torque curve and the power hanging on at the top end rather then falling over quickly. A narrow LSA will generate higher peak cylinder pressures and higher peak torque, not what you want if you already have high static compression ratio. Wider LSA also offer potentially smoother idle.
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RaptorArchived member
Quote: Originally Posted by benjipsi yeah it will be fine uncooled if thats what your gettin at cam though depends if its compatible with stk ecu i believe this jpc stge2 is with a cooler~!
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SkotArchived member
Quote: Originally Posted by Raptor with a cooler~! i was running 9-10psi with stock bottom end and cooler and it run fine, dont think you should run anymore than that though, my headgasket lasted like 2 hours when we upped it to 12.
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vlwagzArchived member
to answer your other question SKot i have a dual layer steel head gasket. not sure what everyone else runs though. hope that helps.
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SkotArchived member
Quote: Originally Posted by vlwagz to answer your other question SKot i have a dual layer steel head gasket. not sure what everyone else runs though. hope that helps. yeah thanks man helps alot, u wouldnt happen to have a retail price would you??
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6BOOSTArchived member
Quote: Originally Posted by RB30-POWER What you also want is a cam that has a wide LSA if you want to lower average cylinder pressures and have less chance of detonation, the wider LSA will also result in wider torque curve and the power hanging on at the top end rather then falling over quickly. A narrow LSA will generate higher peak cylinder pressures and higher peak torque, not what you want if you already have high static compression ratio. Wider LSA also offer potentially smoother idle. Not to at all seem argumentative, but I think its the opposite way around, narrow lobe separation means valves are open at the same time for longer, or more overlap, so intake charge exits exhaust easily, but as revs rise, it gives better cylinder filling and higher top end power. My 2 litre is designed to make power at 10000rpm and we have a lobe sep of 102 deg. Conversely, we run falcons, RB's and lower revving engines around 114 degrees, it gives better low end cylinder filling as it keeps exhaust in the cylinder longer and higher low rpm cylinder pressure, giving earlier spool, better idle and good torque spread, these things would never rev far enough to use the high end cylinder filling of a 102 lobe sep. The narrowest I have ever seen on an RB style engine is 108 deg. 6BOOST
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vlwagzArchived member
Quote: Originally Posted by Skot yeah thanks man helps alot, u wouldnt happen to have a retail price would you?? i think it was about $250. it was over $200 anyway.
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SkotArchived member
Quote: Originally Posted by vlwagz i think it was about $250. it was over $200 anyway. ok yeah i think i priced one of them, just went with the standard turbo one though, have u got any ideas how long the standard one will last??
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