Yes, there are several type. In my shallow knowledge, I only know of 3. Conventional cast iron cams, billet cams and regrind.speed2horizon , great explanation you have there
can i ask, is there a few type high cam in market ?
race cam ? street cam ?
i heard that would effect idling timing , is it ?
speed2horizon, you said there are different highcams for NA and turbo? Can you please explain what is the difference please? I thought it is the same as the function is just to allow higher duration and lift for top end power. Why NA and turbo need difference profile highcams?Simple explanation.
Increase the opening duration so that more air can be vented into the combustion chamber and extract from the combustion chamber. There are different specs of highcams. And also, high cams for turbo and NA have different Cam profile.
Not necessary for a racing car only. It can be used for daily driven to improve performance. Necessary of not depends on what U expect to extract from you engine.
Get more power will definitely consume more fuel on top end. But not necessary when cruising when the load of the engine is minimum on a Close throttle position. There are 3++WHP engine that will cruise for 400-500KM with RM85 of RON97 fuel.
It all depends on how ur tuner when he/she tune the car and what management to use.
BTW, an engine durability does not affect by how much pressure u induced. It's about how many HP ur engine/crank/conrod/piston can take.
There are tons of stock VR4 engine that burst within 1.5bars. But there are also some VR4 with stock internals that I know personally running on 2bars for daily driven achieving 36+ WHP. No problem at all. It all depends on what management u use and of course a good tuner.
This is what happened. BTDC setting, the NA cams have overlapping for the following purpose.speed2horizon, you said there are different highcams for NA and turbo? Can you please explain what is the difference please? I thought it is the same as the function is just to allow higher duration and lift for top end power. Why NA and turbo need difference profile highcams?
I plan to have a Blacktop turbo in the next 5 years. Slowly... So I think it' be better to get some advice from you now. I want to use blacktop over the 16V or 4AFE because I do not want to lose the low-end torque and fuel economy when driving in city. Since you said NA and turbo got different highcam, does this mean that the stock high cam lobes on the blacktop cannot be used if I want to turbo it? Please advice... Thank you.
As long as it's tuned and set well... No specific brand of standalone.is best to use a high degree cams, the pair with the Haltech hehe
normally have to look at the settings and hardware compatibility of the vehicle itself to daily use ... much easier if there is good management and tunerAs long as it's tuned and set well... No specific brand of standalone.
But high cams for street use.. The question is always HOW HIGH??? If u gonna plonk in 308º CAMS as street use on heavy traffic roads like KL...
Hmm... Management wise, it's more for ISC, ICV, etc.... Cam correction setting... So that u'll have a better idle.normally have to look at the settings and hardware compatibility of the vehicle itself to daily use ... much easier if there is good management and tuner
base on my experiance, please correct my statement if there is wrong
is best to use a high degree cams, the pair with the Haltech hehe
yup...that right bro...i agree thatHmm... Management wise, it's more for ISC, ICV, etc.... Cam correction setting... So that u'll have a better idle.
I'd say anythnig below 270 is nice for street.
If interested, fc is used to michine ok ... the original power and satisfaction achievedyes...yes....it's true.......hahahaha
---------- Post added at 12:22 PM ---------- 6 hour anti-bump limit - Previous post was at 12:13 PM ----------
if u want more power in ur engine,comfirm FC is much higher than stock..i'm no SIFU,but that is the rule..now i'm using 300deg cam with 11' lift..hoooliowwww...FC is bad and not street wise..but i'm stick with it..why??coz power lorr...great power gain more fuel..even u using haltech or motec or microtech..it still use the same rule..but all this managemnt help a lot la..anyway,can try watermethanol injection..i never tried it yet..but really want to..i have see the result for turbo car...for NA not yet..have been that it could help reduce FC..
---------- Post added at 01:15 PM ---------- 6 hour anti-bump limit - Previous post was at 12:22 PM ----------
if u want more power in ur engine,comfirm FC is much higher than stock..i'm no SIFU,but that is the rule..now i'm using 300deg cam with 11' lift..hoooliowwww...FC is bad and not street wise..but i'm stick with it..why??coz power lorr...great power gain more fuel..even u using haltech or motec or microtech..it still use the same rule..but all this managemnt help a lot la..anyway,can try watermethanol injection..i never tried it yet..but really want to..i have see the result for turbo car...for NA not yet..have been that it could help reduce FC..
This is what happened. BTDC setting, the NA cams have overlapping for the following purpose.
1) To cool down the pistons crown that's right after combustion.
2) To allow combustion chamber to achieve atmospheric pressure to allow free flow during the overlapping duration.
The higher duration the cams have, the higher overlapping occur....
For turbo cams, they doesn't have overlapping on stock. even for Evo. Reason is...
1) To prevent boost leak during the overlapping at low flow condition.
But when high boost, then u may allow some overlapping provided the turbo is able to produce the flow and pressure even if there's overlapping, then that's a good thing...
Too bad this thing will never happen during low boost condition. So, low boost will lose some pressure.
Methanol injection is a method not really to improve on fuel consumption. But to increase fuel efficiency. So indirectly, from better combustion effieciency, U are able to achieve more mileage.yes...yes....it's true.......hahahaha
---------- Post added at 12:22 PM ---------- 6 hour anti-bump limit - Previous post was at 12:13 PM ----------
if u want more power in ur engine,comfirm FC is much higher than stock..i'm no SIFU,but that is the rule..now i'm using 300deg cam with 11' lift..hoooliowwww...FC is bad and not street wise..but i'm stick with it..why??coz power lorr...great power gain more fuel..even u using haltech or motec or microtech..it still use the same rule..but all this managemnt help a lot la..anyway,can try watermethanol injection..i never tried it yet..but really want to..i have see the result for turbo car...for NA not yet..have been that it could help reduce FC..
---------- Post added at 01:15 PM ---------- 6 hour anti-bump limit - Previous post was at 12:22 PM ----------
if u want more power in ur engine,comfirm FC is much higher than stock..i'm no SIFU,but that is the rule..now i'm using 300deg cam with 11' lift..hoooliowwww...FC is bad and not street wise..but i'm stick with it..why??coz power lorr...great power gain more fuel..even u using haltech or motec or microtech..it still use the same rule..but all this managemnt help a lot la..anyway,can try watermethanol injection..i never tried it yet..but really want to..i have see the result for turbo car...for NA not yet..have been that it could help reduce FC..
I don't have much experience on BOT a blacktop... Cause black top memang highcam.. But not really alot la...Oh yes thank you! Now I'm clear... So you are saying for turbo, the high cams may have higher duration and lift but they try to minimize the overlap is it?
And you are saying that if there is overlapping in turbo, the pressure in the intake manifold will force fresh air & fuel right into the exhaust manifold during the overlap period right? Hmm... I guess this cause boost leak and will waste fuel...
So what to do if I would to turbo a blacktop? Any advice?
Haha... The golden question is still, How much is enough..? Regarding on Rev limit, u can set it at whatever u like... It's the hardware that limits the safety margin of a machine...hi there..
just to clear things a bit for me..i'm planning to run about 1.5~1.8bar of boost in a L2s engine..i've tuned my car before(on dynojet) and noticed that the tuner pushed until 7500rpm..since my turbo start spooling around 3500~4000rpm and achieve full boost around 5500~6000rpm,would there be any significant power change if i start playing with hi cam?can my engine handle more rpm than before?
not making my car to be a drag machine..just like it to be fun to drive on the street what kind of hi cam do you think that suit for my application?prefer the hi cam lift closer to my oem lift,would mild cam is enuff?can the oem valve train handle this kind of cams?
hi there..
just to clear things a bit for me..i'm planning to run about 1.5~1.8bar of boost in a L2s engine..i've tuned my car before(on dynojet) and noticed that the tuner pushed until 7500rpm..since my turbo start spooling around 3500~4000rpm and achieve full boost around 5500~6000rpm,would there be any significant power change if i start playing with hi cam?can my engine handle more rpm than before?
not making my car to be a drag machine..just like it to be fun to drive on the street what kind of hi cam do you think that suit for my application?prefer the hi cam lift closer to my oem lift,would mild cam is enuff?can the oem valve train handle this kind of cams?