cold air intake

[1990-VQ-STATESM]

a mate of mine was telling me that when you driving a cold air intake does not make much of a difference. the only reason it makes a difference on a dyno is because the car is just sitting there and cool air isant flowing. but when your driving and the intake is at the front behind the bumper yor geting a comstant flow of cold air. does any one know what im talking abut if you do what do you think?

[jason phillips]

a mate of mine was telling me that when you driving a cold air intake does not make much of a difference. the only reason it makes a difference on a dyno is because the car is just sitting there and cool air isant flowing. but when your driving and the intake is at the front behind the bumper yor geting a comstant flow of cold air. does any one know what im talking abut if you do what do you think?

That makes no sense at all.

[JNP304]

Your question seems contradictory. Your saying that more power is made on a dyno but no air is flowing. Then you say more cold air is flowing when driving but it makes no difference?
The cooler the air flowing into the intake the more power it will make, same with the volume of air. Some aftermaket intakes are rubbish as they cannot get enough volume in and therefore do not make more power. Some get the volume in but have the intake in the wrong place so warm/hot air flows in, again not making more power.
If you have an intake like an OTR it gets the volume and the temp drop to result in more power, and this is definatley noticeable on the dyno and on the road.

[VU_SS_UTE]

I think everyone that has put a better than factory air intake setup on their car, will share my opinion that your mate has no idea what he is talking about!

[swingtan]

I understand where this is coming from.....

When you are driving down the road, the flow of air around / under the car means that you don't get a buildup of hot air near the standard intake position. When moving, there is a partial vacuum under the car which draws air through the radiator and out under the car. The air around the std. intake position would benefit from this air flow.

When a car is on the dyno, it's not moving. So this air flow is not occurring. Therefore it's possible that the intake temps will be higher.

However there are a few other things that need to be considered....

- Any additional cooling fans used to help cool the engine, probably also blow into an OTRCAI, helping the figures a tiny bit.
- An OTRCAI will always have a shorter intake path, with less bends. So it will most probably flow better than an intake in the std. position.
- Because the OTRCAI is shorter, there is less time for air to heat up in the intake pipes, resulting in a cooler charge delivered to the engine.

I personally don't run an OTRCAI, in fact I don't even run a MCAI. I have a modified inlet to an otherwise std. air filter box on my VZ SS. However I've seen enough evidence on these forums to know that a correctly fitted and tuned OTRCAI will out perform an intake in the std. location.

Simon.

[OPPYLOCK]

I know what you're getting at but try and think of it this way, even when a vehical is moving at speed there will still be warm air caught in the engine bay and standard intake systems will pick up more of this as opposed to aftermarket intakes that are designed to take air from behind the headlight or in front of the radiator.This and increasd flow from less restrictive design is what improves performance.

[Vulture]

I personally don't run an OTRCAI, in fact I don't even run a MCAI. I have a modified inlet to an otherwise std. air filter box on my VZ SS. However I've seen enough evidence on these forums to know that a correctly fitted and tuned OTRCAI will out perform an intake in the std. location.

Simon.

What did you do to your airbox? The VZ is a bit annoying as there is the coolant filler in the way of doing a proper MCAI. I made a second hole and still run the factory snorkel along side it. The snorkel provided a bit of a shield from the hot air in the engine bay (not great). I want to run my OTR again but waiting on some repairs and mods.

[vt350phantom]

People on here have picked up a few tenths with OTRCAI's

[swingtan]

What did you do to your airbox? The VZ is a bit annoying as there is the coolant filler in the way of doing a proper MCAI. I made a second hole and still run the factory snorkel along side it. The snorkel provided a bit of a shield from the hot air in the engine bay (not great). I want to run my OTR again but waiting on some repairs and mods.

I threw away the std. right angle bit that goes from the air cleaner up to the radiator cover. Then fitted a 90mm stubby ram tube in it's place. It just clears the coolant filler and gives a noticeable amount of intake roar. I don't have any pics here at work but will see if I can find some at home tonight.

[tuff304]

OTR appear to be the best cold air induction for an ls1 although modifying the factory air box is not a bad option either

[hallster]

Had my car dynoed with a stock air intake and it was shown to be a resrtiction of both the MAF pipe and the air box. A 2nd hole was put in the air box and it picked up 5rkw over the top rev range on a stock car with a cat back and an edit. The 2nd hole for the MCAI also makes a little more noise

[IH84DS]

Cold air intake is what we all want, but some of the systems out there can be upwards of $500. I just think its not worth paying that sort of money when you can bang up a backyard job that will give you more of a RAM effect for a tenth of the price.

[A1DRAKE]

yeah can u use a vs cold air intake and box {round top } it got a bigger mouth and it a holden part should fit in easy ??????????:teach:

[swingtan]

Hi Guys,
I forgot all about the pics didn't I .......

You've probably seen this thread already, but just in case.....

http://www.ls1.com.au/forum/showthread.php?t=60872&highlight=vz+2+hole

Last Saturday I "2 Hole" modded the VZ and wrote up a "howto". It also shows the ram tube setup before the "2 hole".

Simon.

[SS LOZ]

a mate of mine was telling me that when you driving a cold air intake does not make much of a difference. the only reason it makes a difference on a dyno is because the car is just sitting there and cool air isant flowing. but when your driving and the intake is at the front behind the bumper yor geting a comstant flow of cold air. does any one know what im talking abut if you do what do you think?

WHAT!!:weirdo:

[A1DRAKE]

SEEN THIS ON EBAY http://http://cgi.ebay.com.au/Holden-V8-Cold-Air-Intake-Package-VN-VP-VQ-VR-VS-New_W0QQitemZ110028525779QQihZ001QQcategoryZ50139Q QrdZ1QQcmdZViewItem

[raggedy]

Hi,
from a purely engineering point of view, the engine is just an air pump, powered by igniting the a/f mixture and momuntum.....and like any pump the less the upstream and downstream resistance to air flow, the more efficient it is given any given ambient condition.

From a thermodynamic point of view, the cooler the sir the a: more dense (greater mass per volume) it is and b: less humidity it contains, both of which means the more fuel can be added and thus the more power generated.

so...anything that allows for an increase in airflow and reduction in air temperature will be of benefit (with appropriate tuning to enable the computer to take the minute advantages of these changes).

the problems occur when some of the "dodgy" not quite thought through properly solutions to the above don't seem to work as expected.

just my 2C worth ;-)

Raggedy