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Post by subzero on Jun 18, 2008 19:55:34 GMT 8
I'm don't knw much too...but looking at it frm a very lay-man point of view, the openings on the bonnet shd provide better air circulation in the engine bay..when driving, cool air will be forced in and push out hot air..so, shd mean cooler engine bay temp..tis is frm a very lay-man view lah..not sure if technically, tis is not true... technically some parts need hot while others are better kept cool. eg: engine block need to be hot to run efficiently and smoothly. Exhaust headers (extractors) also need to be hot (that's why there is heat wraps for exhaust also) When you introduce cool outside air into the engine bay you will decrease the efficiency of the engine. Rexes and legacy has air scoops because they have radiators placed under the scoops for their turbo. Evos and Colt R have a different type of vents to allow the air from the front to vent out the top, the air flow will bypass the engine. Of course these are only the basics of engine operations, I know there are some street mods that are counter intuitive but actually works, I was just wondering if this was one of them. I think its more to heat dissipation than direct cooling of the engine bay.. Air circulating in the engine bay can provide efficiency in running the engine.. Of course u said, some parts needs heat retention like the engine block, exhaust headers etc etc.. But some parts need "ventilation" in order to operate better.. Parts like TB, air box(open filter).. Location of the vents also play a part in determining the efficiency of the engine..
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Post by psyfool7 on Jun 18, 2008 20:28:24 GMT 8
True..if full CF it will be damn expensive but will be strong and very light..F1 car bodies are made of CF and designed to splinter to pieces and dissipate energy upon impact (like nose cone portion)....Most CF hoods here are mainly Fibreglass wrapped with a layer or maybe a few layers of CF...so, don't tink it's tat strong...more for looks..but definitely lighter than stock bonnet..and stronger than juz plain fibreglass bonnets..the skeletal structure is more to hold the shape and stregthen it a bit..but if meet wif accident, will still break to pieces i tink..
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Post by yanuk on Jun 18, 2008 22:07:35 GMT 8
True..if full CF it will be damn expensive but will be strong and very light..F1 car bodies are made of CF and designed to splinter to pieces and dissipate energy upon impact (like nose cone portion)....Most CF hoods here are mainly Fibreglass wrapped with a layer or maybe a few layers of CF...so, don't tink it's tat strong...more for looks..but definitely lighter than stock bonnet..and stronger than juz plain fibreglass bonnets..the skeletal structure is more to hold the shape and stregthen it a bit..but if meet wif accident, will still break to pieces i tink.. confirm + guarantee + chop anyone knows the kind of weight savings we might see for the cerato stock vs this "CF" ? I tried the cerato bonnet is indeed very heavy. I think can do bench press with it also.
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Post by LMF on Jun 18, 2008 22:23:58 GMT 8
i think i just drop the CF idea, too complicated for me haha... Maybe just paste black sticker when my bonnet gets over-scratch next time
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Post by psyfool7 on Jun 19, 2008 0:26:16 GMT 8
Tink weight savings definitely will be quite alot..Stock bonnet super heavy...
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Post by ceratov2m on Jun 19, 2008 1:58:44 GMT 8
Wa! bro if really $300+ with inverted scoop i am not sure if i can resist. hahahha... seriously if got this lobang must inform me. if i hav enough spare $ at tat time i will get it man.. Thanks! jemjem[/quote] I'll re-check with my source again and will update u guyz here!
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Post by ceratov2m on Jun 19, 2008 2:04:12 GMT 8
Yo bro I think as long as the initial thickness of the laq is "good", can use duragloss detailing product to have a protection layer(sealant) on top and do it biweekly. i think this should maintain the look.. I am more worried of the quality of the carbon fiber material underneath used. heard some colour fades.. jemjem I think the $300 ones are probably just fibreglass (maybe not even FG, just resin with cotton/poly cloth) with a final top layer of CF. Carbon fibre is very expensive, Just the CF cloth alone costs $50-60 for a small patch of 0.5m x 1m. That's only 1 piece, you need at least 6-8 layers that is vacuum with heat layered while applying resin in between. Polyester cloth on other hand is very very cheap and resin comes in KG tins of about <$20 each tin. A shortage of CF material last year due to A380 demand made the CF prices soar. 300 is cheap, but do remember to calculate shipping as well. My last painful experience is that shipping (on sg side) is a killer If it's indeed fibreglass with CF look, i dun mind as long as it's lighter den our heavy stock bonnets! As long as the price is within reasonable reach...I'll buy...
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siqma
Gear THREE
juz sHuT-uP & DrIvE,DrIVe,dRiVe
Posts: 375
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Post by siqma on Jul 8, 2008 1:45:18 GMT 8
so anyone done it yet??? CF bonnent+vents Got pic??
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Post by LMF on Jul 8, 2008 1:50:08 GMT 8
Seem like no one did for Cerato yet, believe it costs $700+ also, would love to see someone in Singapore do it... If u want can refer to Streetkiaz for Cerato drivers who have did it...
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Post by yanuk on Jul 8, 2008 2:27:34 GMT 8
I emailed some CF bonnets manufacturers and most of them were skittish about the weight and would only say 7-8kg savings. Not really a big savings to me really. If just a 7-8KG savings, I would just use a smaller battery with P.O.D. pack and take out the spare tire.
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siqma
Gear THREE
juz sHuT-uP & DrIvE,DrIVe,dRiVe
Posts: 375
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Post by siqma on Jul 8, 2008 3:01:31 GMT 8
Seem like no one did for Cerato yet, believe it costs $700+ also, would love to see someone in Singapore do it... If u want can refer to Streetkiaz for Cerato drivers who have did it... ya bro i juz check it out at Streetkiaz... the guys a crazy esp on the video
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Post by LMF on Jul 8, 2008 3:19:42 GMT 8
hehe cool!!!
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Post by subzero on Jul 8, 2008 13:23:16 GMT 8
I emailed some CF bonnets manufacturers and most of them were skittish about the weight and would only say 7-8kg savings. Not really a big savings to me really. If just a 7-8KG savings, I would just use a smaller battery with P.O.D. pack and take out the spare tire. Yeah.. If u are running on CF hood plus removal of some parts, would be better right..?? So its just about how u want the PWR(Power to Weight Ratio) to be adequate as possible..
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Post by psyfool7 on Jul 8, 2008 15:19:49 GMT 8
..Bling factor..
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Post by yanuk on Jul 8, 2008 21:47:50 GMT 8
..Bling factor.. for bling I think just apply CF wrap can liao lah.. hahah to pay $700 for 0.6% weight savings.. er.. not too cost efficient, but it's true that if everything adds up weight savings can reach a substantial amount.
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Post by psyfool7 on Jul 9, 2008 1:01:59 GMT 8
..Bling factor.. for bling I think just apply CF wrap can liao lah.. hahah to pay $700 for 0.6% weight savings.. er.. not too cost efficient, but it's true that if everything adds up weight savings can reach a substantial amount. How to CF wrap?..If juz sticker, might as well juz pass..don't look real enuff and heard got some issues with durability due to heat.. ...If wrap wih real CF, then instead of making it lighter, it will only become heavier.....Anyway, enquired with Robson, they don't do wrap on stock bonnet...and even if they do, I'm sure it will cost a bomb...might as well get this China one..
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siqma
Gear THREE
juz sHuT-uP & DrIvE,DrIVe,dRiVe
Posts: 375
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Post by siqma on Jul 9, 2008 1:24:50 GMT 8
okla...let say we vent on the rightside(above the intake) of the bonnet ok tak juz to "cool off" like CAI
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Post by ceratov2m on Jul 9, 2008 1:30:41 GMT 8
okla...let say we vent on the rightside(above the intake) of the bonnet ok tak juz to "cool off" like CAI It would be great as the intake would be the 1st to receive straight cool air around if u've done mods to air-intake!
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Post by psyfool7 on Jul 9, 2008 8:24:06 GMT 8
Near but not direct..probably slightly infront..coz like me using Open pod scared the water drop directly onto the filter..
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Post by yanuk on Jul 9, 2008 12:56:11 GMT 8
for bling I think just apply CF wrap can liao lah.. hahah to pay $700 for 0.6% weight savings.. er.. not too cost efficient, but it's true that if everything adds up weight savings can reach a substantial amount. How to CF wrap?..If juz sticker, might as well juz pass..don't look real enuff and heard got some issues with durability due to heat.. ...If wrap wih real CF, then instead of making it lighter, it will only become heavier.....Anyway, enquired with Robson, they don't do wrap on stock bonnet...and even if they do, I'm sure it will cost a bomb...might as well get this China one.. I forgot which company already, they will apply 1 layer of real CF laminated to your bonnet. costs a bomb and adds weight.
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Post by jemjem on Jul 9, 2008 13:26:30 GMT 8
By the way I checked with amipex, they told me if we wana customised openings, their CF bonnets will have under tray to prevent water going into the engine bay... Not sure how it works though... jemjem
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Post by psyfool7 on Jul 9, 2008 18:44:31 GMT 8
By the way I checked with amipex, they told me if we wana customised openings, their CF bonnets will have under tray to prevent water going into the engine bay... Not sure how it works though... jemjem Not sure wat tray they referring to..Some vents don't serve any function..juz for show..the tray is attached underneath to block water frm entering.. ..some hav purpose..channel the water away from vital areas like the spark plug area, electrical areas...
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Post by ceratov2m on Jul 10, 2008 3:17:18 GMT 8
By the way I checked with amipex, they told me if we wana customised openings, their CF bonnets will have under tray to prevent water going into the engine bay... Not sure how it works though... jemjem So all those intrested maybe can gather intrest to see wat type of openings or vents we go for Chk wif them on GB price,etc... Maybe Bro psyfool will wanna start a GB thread and Bro jemjem to chk wif supplier while I source for another supplier to bring it in if I can hv more details of the CF hood?
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Post by psyfool7 on Jul 10, 2008 8:59:12 GMT 8
I cannot start the GB thread lah..coz i myself not sure when i can ever get it..
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Post by LMF on Jul 10, 2008 9:03:04 GMT 8
Trays/vents believe some rex bonnet have, can see the word STI inside, but does it really serve any real purpose? if get the CF bonnet original bonnet also dunno put where haha...
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