Itb

Started by jeffwins24 · Sep 4, 2008 · 14postsInvision 2005–09

jeffwins24Sep 4, 2008, 6:19 am · #1

I've seen a few ITB CA18DET's on google image. is there a special kit or is it custom?

Umai NaaSep 4, 2008, 8:44 am · #2

Most likely custom.

Nismo used to make a cast aluminium adaptor flange to bolt individual throttle bodies onto CAs. I saw one on Yahoo Auctions about a year ago. I'm kicking myself now, as it was cheap, and now I'm going down that path, as I'm building an NA engine.

Alternatively, you could get in touch with EFI Hardware here in Australia. They do a set for the CA, but they're $1200AUD.

XanoSep 4, 2008, 8:59 am · #3

Umai Naa @ Sep 4 2008, 03:44 AM
Most likely custom.

Nismo used to make a cast aluminium adaptor flange to bolt individual throttle bodies onto CAs. I saw one on Yahoo Auctions about a year ago. I'm kicking myself now, as it was cheap, and now I'm going down that path, as I'm building an NA engine.

Alternatively, you could get in touch with EFI Hardware here in Australia. They do a set for the CA, but they're $1200AUD.

So 990.48, thats not THAT bad for a full ITB setup.

jeffwins24Sep 4, 2008, 9:01 pm · #4

I'm just wondering if this would be able to work on a turbo model. 990 buxs anit bad I've seen ITB'S go for almost 1,500

Umai NaaSep 8, 2008, 10:26 am · #5

I don't see why it can't.

As long as everything is sealed, you shouldn't have any dramas.

ArroSep 8, 2008, 3:15 pm · #6

Well think about it, our engines use airflow meters, how would you meter it? You cant. You'd have to run a stand-alone engine management system that uses speed density (MAP).

XanoSep 8, 2008, 3:56 pm · #7

Arro @ Sep 8 2008, 10:15 AM
Well think about it, our engines use airflow meters, how would you meter it? You cant. You'd have to run a stand-alone engine management system that uses speed density (MAP).

i WISH our engines used manifold absolute pressure sensors for air metering rather than mass air flow sensors.

ArroSep 8, 2008, 5:46 pm · #8

I don't know if HKS's Vein Pressure Converter (VPC) has a chip for CA18DET, otherwise you could use one of those, since that's what it does, uses a MAP sensor to simulate an airflow meter signal and sends that to the ECU.

VPC's haven't been used much since 2002 or so. Not even sure if you can still buy them new.

Edit: From a quick google, apparently people have indeed used an HKS VPC and the accompanying fuel computer, the GCC, on a CA18DET. So in theory, if you used one of those... but I have no idea how it would react to a vac source tapped from the short runner of an ITB setup.

Umai NaaSep 9, 2008, 5:31 am · #9

Seriously, if you're going for quad throttle bodies, you wouldn't even bother with a stock ECU, or even a PFC for that matter.

I'm running mine off a Micro-Tech LT8S that I picked up off Ebay for $750AUD, already configured for the CA18DET.

One of my mates is running the EFI Hardware throttles on his Datsun A15, with a Haltec. While it aint turbo'd, it sounds very nice smile.gif

blue streakSep 23, 2008, 3:46 pm · #10

HA! Im using a MAP on mine along with a Electromotive TEC II ECM. MAFs suck

ArroSep 29, 2008, 3:41 am · #11

Not necessarily, just depends on your application. Saying "MAFs suck" is a bit narrow-minded tongue.gif Anyways I agree with Umai, you pretty much need a standalone.

blue streakOct 1, 2008, 12:53 am · #12

MAPs seem to be more "forgiving or flexable", not to mention cheaper to replace or upgrade.

MagnumOct 1, 2008, 2:08 am · #13

You could make your own. http://www.extrudabody.com/Products/ITBs.html

seishukuOct 1, 2008, 2:39 am · #14

GTi-R SR20DET has ITBs stock, and runs a MAF sensor... The trick is to use a plenum. laugh.gif

Yeah, you probably won't get the awesome induction sound you get from open ITBs, BUT at least with a MAF you'll get an accurate air flow measurement, unlike with speed density which uses tables to "calculate" "air flow"... Basically a guesstimate.
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