monaro bonnet on vx ss?

[Thessman]

ive recently removed the engine cover on my vx ss as i was told this helps ventilate and cool the motor. whether this is true or not, i dont care. but i was also thinking of installing a monaro bonnet to help ventilate and cool, assuming of course the monaro vents will aid in this and if not they still look good. can anyone clarify this and aldo, does anyone know of a place in the melbourne area and surrounding suburbs (preferably morington peninsula, dandenong etc) that sell them for a resonable price. i dont need it painted as im a spray painter by trade. also, there are fibre glass and steel bonnets on the market, which is better? long thread, i know but any help would be greatly appreciatted.

[GEN3RATD]

i wouldnt bother unless its for looks, i doubt you will any benefit from it.

[Huntington]

and if its for looks, im not a fan, way better off spending money on the go go

[Killr6]

get steel, as a spray painter you should know which is better? and its only for looks

[Thessman]

Well I was asking which is better from a perfomance view. Maybe I'll research a little more. Thanks guys.

[MikeCuzzy]

More for show than performance as far as I know. If you want to cool the engine better, upgrade stock air intake. The effects of the vents on the bonnet would be negligile at best, also not sure all fibre glass bonnets are legal, so double check.

[zapper-l67]

Tested, Genuine steel GMH Monaro Bonnet gives 50 deg coola under bonnet temps in summer..

[Killr6]

thats a sexy grill btw

[MikeCuzzy]

Tested, Genuine steel GMH Monaro Bonnet gives 50 deg coola under bonnet temps in summer..

Not saying they won't have any effect. But 50*C less in 'summer'? Not exactly strict testing conditions, day or night? Humidity levels? Temperature? Were you moving? Because as these vents are essentially guided air intakes, unless you're doing a decent speed they are not being utilised.

Their effect, if any, would be subject to a whole host of conditions. Unless you were driving for long periods of time at high speeds (80+), they're more about show than performance. It's like a rear spoiler, not much effect unless you're doing some serious speeds.

[GEN3RATD]

how much of a HP gain is 50*c cooler?

[Kieran263]

Well each speed hole is worth 10rwhp, and these are two big speed holes, so I'd say 40ish rwhp.

[GEN3RATD]

what about if i add a cop chip?

[Kieran263]

The standard cop chip gives you an extra 185rwhp and a redline of 12,500rpm.

[zapper-l67]

I think you might be getting a bit carried away guys.

The test was done on a 30deg day in summer on a cruse around the great ocean road.
Under bonnet temps on my friends identical commodore without the vents got up to 220 deg Fahrenheit using old stock jaycar Fahrenheit temp probes and logging software.

Both car were moving between 30Kph on the real twisty stuff up to the 100Kph limit. My VX with the Monaro bonnet scoops with the rubber baffles cut out showed a consistent 50 Deg and up to 80 deg Fahrenheit lower. That shouldn't be to hard to believe.

Also when we puled up with the cars at Apollo Bay we opened the bonetts and the non vented car was clinking and clicking as it was cooling down where mine was barely hot at all..
So what I am saying is the vents do work, as for HP difference I couldn't say.
Zapp

[MikeCuzzy]

Ok farenheit, that's a bit different. And from your test, 100kph, it reduced temps. Fair enough, to be expected at those speeds. But what are the performace implications of this? You're going to need more than just a temperture gauge to work out what the lower temps may do (if anything) for the car. That said, I would very keen to see if there are any benefits, might justify my putting them on my car a bit more...

[zapper-l67]

The only down side I have found to the bonnet vents is the engine gets bloody dirty and every time you wash the car you need to wash under the bonnet as well so it doesn't get away from you and start looking shit..
Zapp

[GEN3RATD]

Ok farenheit, that's a bit different. And from your test, 100kph, it reduced temps. Fair enough, to be expected at those speeds. But what are the performace implications of this? You're going to need more than just a temperture gauge to work out what the lower temps may do (if anything) for the car. That said, I would very keen to see if there are any benefits, might justify my putting them on my car a bit more...

well farenheit is a massive difference.

i dont really care if the engine runs "cooler" - im more interested on if their are gains to be had. and i honestly think its about the same as the two hole mod.

[MikeCuzzy]

Mhmm, agree. I don't think it's gonna make any real difference as far as gains, be nice if there were some actually testing done regarding power.

[Killr6]

well farenheit is a massive difference.

i dont really care if the engine runs "cooler" - im more interested on if their are gains to be had. and i honestly think its about the same as the two hole mod.

there are no gains, its just a cooler engine, which in the long run the money you spend on a new bonnet gives you a cooler engine then a stock bonnet, and the bonnets are sexy and i looked into them a while back, but they are worth what you pay for them imo.

and did your two cars have different intake systems? or were they the same as well?

[GEN3RATD]

i seriously dont see the point unless its for looks. and IMO they dont look that great.

if you want gains get an exhaust.

[Killr6]

i seriously dont see the point unless its for looks. and IMO they dont look that great.

look better then the VE walky bonnet, looks like a giant penis.

[GEN3RATD]

true. whats wrong with the stock bonnet though

[MikeCuzzy]

look better then the VE walky bonnet, looks like a giant penis.

And thus the Monaro bonnet looks like a rather unhealthy penis. Still I don't mind the look of them, can anyone confirm on fibreglass bonnets, are they legal? I heard they weren't, something about the performance in a crash comparable to steel?

[GEN3RATD]

i like them on monaro's

[Killr6]

think they are illegal