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2mm
Posted: Wed Jan 16, 2013 7:43 am
by Madhatter81
Hi guys I've just got a 62 mm throttle body of a ATR
does 2mm really make a difference??
I plan on putting a h22a7 head inc cams on to my h22a2 bottom end
Is there any real point me messing around
Posted: Wed Jan 16, 2013 8:04 am
by Froidas
What intake manifold are you going to use? If H22A2 stock, then you will need to port it's inlet to 62 mm.
Either way, 2 mm makes a difference and it definitely won't be too much . You won't get +10 hp or so, but every little helps. Those 212 hp in H22A7 aren't there with no reason.
Posted: Wed Jan 16, 2013 8:43 am
by Buzzonion Vtec
With your setup you'll see more benefit from the ATR throttle body than you would with an oversized 70mm aftermarket one
Posted: Wed Jan 16, 2013 9:32 am
by A1ex
Madhatter81 wrote:
Hi guys I've just got a 62 mm throttle body of a ATR
does 2mm really make a difference??
I plan on putting a h22a7 head inc cams on to my h22a2 bottom end
Is there any real point me messing around
If you go with the ATR inlet manifold too, and a decent exhaust system and take it to Buzzonion Vtec to do the work you could see 220-230bhp from that setup with a good tune.
Also, in answer to the question does 2mm make a difference, yes it does;
60mm TB has a 2827mm^2 flow area
62mm TB has a 3019mm^2 flow area
which will allow an extra 6.5% of air through, you'll need the extra airflow to ensure it's not restricting the bigger cams as everything will be flowing quicker to produce more power.
Posted: Fri Jan 18, 2013 12:16 am
by Madhatter81
Another question this ATR throttle body doesn't have the cold start on the bottom of it do you think it will make a difference ??
How does the ATR cold start work ??
Posted: Fri Jan 18, 2013 7:30 am
by A1ex
It needs to be tuned differently on the ecu, I'm running one
Posted: Fri Jan 18, 2013 7:41 am
by Madhatter81
Who tuned yours ??
Is it a lot of messing about ??
For the gains!!!
Posted: Fri Jan 18, 2013 9:12 am
by A1ex
It was part of a bigger build, wasn't just the TB. The whole build, including a full head rebuild cost 3k parts and labour not including the exhaust.
It was tuned with a Hondata s300 socketed ecu. A lot of work to tune just a TB, I'd put it on as part of a bigger build rather than on its own
Posted: Tue Mar 12, 2013 2:29 pm
by Drax
how about a 70mm skunk2 TB on an ATR inlet, would that work?
Posted: Tue Mar 12, 2013 2:35 pm
by Donald
I would have though the addition of the 70mm TB and ATR inlet would be overkill unless you're upgrading internals too. But then I don't know a lot at all.
