ATR intake manifold onto 4g H22A#

chrismc · Post by **chrismc** » Sun Nov 04, 2012 3:53 pm

Just after some opinions from those who have put an ATR inlet manifold onto a 4g VTEC (H22A/A2)

What are the real world gains?

Is it a worthwhile/cost effective as a bolt-on whilst the rest of the motor is largely stock...? Does it work ok with a standard map or is a mapped ECU a necessity?

ATR manifolds are easy enough to come-by & I have found conversion kits online..

Just contemplating whether to give it a go or not

Chris

A1ex · Post by **A1ex** » Sun Nov 04, 2012 4:08 pm

Without a tune you will lose, resetting the ecu isn't enough. There are gains to be had over stock on a near stock motor but will need a tune to get them

chrismc · Post by **chrismc** » Wed Dec 05, 2012 10:12 pm

Have done a little more research online & have seen claims of 6-8bhp across the range simply as a bolt-on to an H22

Being that I now have a chipped p13 ECU (on a uk h22a2), I suspect the car is a little richer than ideal- so an airflow improvement on the intake side will be really beneficial

Has anyone else fitted an ATR intake & got any opinions?

Post by **NafemanNathan** » Wed Dec 05, 2012 10:35 pm

A chipped P13 won't be enough. An otherwise stock H22a relys on the IAB's to manage the torque throughout the rev range. (At around about 4700rpm, I can't recall the exact figure, the IAB's, which are the butterflies in the standard H22a manifold open up the secondary runners to increase air flow to the head.) By simply fitting an ATR manifold you are eliminating the secondary runners. The head will receive around about the same amount of air for the higher revs as the air is still being forced through the same size opening in each port of the head, but in the lower revs the engine will be receiving far too much air for a stock motor and will be down on power/torque. I very much doubt the fuel increase dictated by the chip (

) will make up for this.

There are a lot of topics on the subject on the web and I've not seen one recommend an ATR manifold on a stock motor with a "chip". And that's knowing that all these "chips" really do is increase fuel consumption.

chrismc · Post by **chrismc** » Thu Dec 06, 2012 8:20 am

NafemanNathan wrote:A chipped P13 won't be enough. An otherwise stock H22a relys on the IAB's to manage the torque throughout the rev range. (At around about 4700rpm, I can't recall the exact figure, the IAB's, which are the butterflies in the standard H22a manifold open up the secondary runners to increase air flow to the head.) By simply fitting an ATR manifold you are eliminating the secondary runners. The head will receive around about the same amount of air for the higher revs as the air is still being forced through the same size opening in each port of the head, but in the lower revs the engine will be receiving far too much air for a stock motor and will be down on power/torque. I very much doubt the fuel increase dictated by the chip ( ) will make up for this.

There are a lot of topics on the subject on the web and I've not seen one recommend an ATR manifold on a stock motor with a "chip". And that's knowing that all these "chips" really do is increase fuel consumption.

OK- so how about using a mapped P28 then? I'm guessing you aren't a fan of the spoon chip in a P13 from the rolling eyes?

I don't think the spoon map is necessarily more 'rich' than stock on a jdm h22a, however my car has an a2 and thus has less compression than an h22a so is likely running more rich than is ideal

There would appear to be a top-end gain to be had using a single runner inlet as the manifold (+mapping) is the only real difference between an H22a8 (late 5g prelude) and h22a7 (ATR)...I've driven both & the ATR feels more aggressive up top without doubt

Post by **NafemanNathan** » Thu Dec 06, 2012 9:01 am

A properly mapped P28 is where it's at. A good tuner will actually make a gain on a completely stock H22a by simply tuning a P28. By adding an ATR mani and tuning to suit you will see gains again.

A genuine Spoon chip is better (As you hadn't specified the chip I assumed you just meant an ebay special "chip"

), but remember the genuine Spoon ecu/chip was developed to run with pretty basic breathing mods. An ATR mani will change how the car breathes altogether. Think of it as the car needing to forget how it once breathed and now it needs to learn how to breathe in an altogether different fashion. The Spoon chip can't help with that.

Post by **Merlin** » Thu Dec 06, 2012 9:02 am

chrismc wrote:how about using a mapped P28 then?

Cough!

Post by **NafemanNathan** » Thu Dec 06, 2012 9:07 am

If you have a tuner near you that'll do Crome, snap ^ that up Chris. Can't believe you still haven't sold that Merlin!

chrismc · Post by **chrismc** » Sun Dec 09, 2012 2:03 pm

PAW are only 10mins up the road from me- but I don't think Rich is a Crome fan/tuner.

H-Tune are also doing P28's at under £150 now.

Trouble is you then have to factor in the cost of a proper tune on the system of choice on top of that...

Maybe il just find a secondhand 4g intake mani & send it to my flow man for some fettling for the time being....

bennyboy · Post by **bennyboy** » Sun Dec 09, 2012 5:42 pm

If you take a look at my profile thread, PAW did ....well, that:

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If you are lucky enough to be that close to them, I'd say take your time and pick up the bits you need, then let them get their hands on it