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OBX Individual Throttle Bodies


andybp

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7 minutes ago, Jake.Lowther said:

May be a stupid suggestion but what about small mini ducted fans with some ducting pipe bringing cold air from outside into the bay, could be discreetly installed wouldn't have to go right to the intake trumpets.

Would lower the temps a small amount, anything creating air flow in the bay will bring the air temps down. Like the old BMWs had belt powered cooling fans.

already done it, it's a bit of an aluminium ducting and fibreglass bodge right now using a motorbike cooling fan but it makes quite a difference I'll post up a pic tomorrow if I remember

:)

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5 minutes ago, andybp said:

already done it, it's a bit of an aluminium ducting and fibreglass bodge right now using a motorbike cooling fan but it makes quite a difference I'll post up a pic tomorrow if I remember

:)

Ah fair enough it stopped most of your heating issues then?

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Just now, andybp said:

have considered it but it'll be a pig of a job with the engine in

:)

Could be worth it in the long run, would have to do some research in  heat reduction from the wrap. Also you can get heat resistant/insulating paint which if you put in the side of the block where the exhaust ports are I imagine would make a massive difference to bay temps.

 

 

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22 hours ago, Jake.Lowther said:

Ah fair enough it stopped most of your heating issues then?

picture as promised please bear in mind this is a temporary bodge to try to see what works and it has made a big difference 5-10 Deg

 

IMG_20180823_183215.jpg.ca7751c12741670e389837431b6c885c.jpg

 

:)

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20 hours ago, andybp said:

picture as promised please bear in mind this is a temporary bodge to try to see what works and it has made a big difference 5-10 Deg

 

IMG_20180823_183215.jpg.ca7751c12741670e389837431b6c885c.jpg

 

:)

Not a bad start I'd try something coming from either side where the headlight braces are if you can cram it in lol

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9 hours ago, Daisyduke said:

 

4 hours ago, Bakkums said:

Sasha Anis did this: Cold air intake itb

 

 

the problem with most of your suggestions is that there just isn't the clearance it's hard to show in photo's but it's really tight.

just look at the engine bay in sasha's 350 and how much standard stuff is missing  and I'm pretty sure his bonnet wasn't standard either

but feel free to keep the suggestions coming as I'll be back on it soon, as I have just sorted out the electronics issues I've been having with the airride

:)

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  • 7 months later...

I'm not sure where to start with this so here goes

Just as the weathers getting reasonable and I can carry on with this project someone on here (Reecodecides to sell a set of new Jenvey ITB's at not much more than I paid for my knock off OBX ones so just out of curiosity I had to have them :shrug:

At first glance they are identical but looking closer the Jenvey ones are far superior.

The castings are better and of better quality aluminium with no impurities unlike the OBX ones

The machining is more accurate, I haven't had to finish tapping holes or countersinking and everything lines up without me re-drilling holes

The throttle bodies themselves open and close more smoothly

The supplied fuel rails will also fit unlike the OBX ones

 

After the initial fitting issues of the OBX ones were sorted the only thing they still occasionally do wrong is not closing fully causing it to idle a couple of hundred rpm faster than it should; on a track car this wouldn't get noticed on a road car it's a little irritating but not a big deal it's also doing it less with use

So without a doubt the Jenvey ones are better but are they worth £1400 more than I paid for the OBX ones an extra £600-700 on a road car I'd say yes but not £1400

but that's just my opinion

 

But now I do have a set of Jenvey ones for near OBX money I'm already preparing to swap them over

I've already drilled and tapped the manifolds for the vacuum system and also made some insulating spacers to go between the manifolds and the throttle bodies to help overcome some of the temperature issues with the current setup 

 

IMG_20190409_211830.jpg.dd9022ef7f921ee2fc42d876fff8d223.jpg

 

IMG_20190410_174036.jpg.3b60fb3a256fcf6839328d7d618beb37.jpg

 

:)

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On 10/04/2019 at 16:22, andybp said:

I'm not sure where to start with this so here goes

Just as the weathers getting reasonable and I can carry on with this project someone on here (Reecodecides to sell a set of new Jenvey ITB's at not much more than I paid for my knock off OBX ones so just out of curiosity I had to have them :shrug:

At first glance they are identical but looking closer the Jenvey ones are far superior.

The castings are better and of better quality aluminium with no impurities unlike the OBX ones

The machining is more accurate, I haven't had to finish tapping holes or countersinking and everything lines up without me re-drilling holes

The throttle bodies themselves open and close more smoothly

The supplied fuel rails will also fit unlike the OBX ones

 

After the initial fitting issues of the OBX ones were sorted the only thing they still occasionally do wrong is not closing fully causing it to idle a couple of hundred rpm faster than it should; on a track car this wouldn't get noticed on a road car it's a little irritating but not a big deal it's also doing it less with use

So without a doubt the Jenvey ones are better but are they worth £1400 more than I paid for the OBX ones an extra £600-700 on a road car I'd say yes but not £1400

but that's just my opinion

 

But now I do have a set of Jenvey ones for near OBX money I'm already preparing to swap them over

I've already drilled and tapped the manifolds for the vacuum system and also made some insulating spacers to go between the manifolds and the throttle bodies to help overcome some of the temperature issues with the current setup 

 

IMG_20190409_211830.jpg.dd9022ef7f921ee2fc42d876fff8d223.jpg

 

IMG_20190410_174036.jpg.3b60fb3a256fcf6839328d7d618beb37.jpg

 

:)

I’m sorry if I missed it but what are you using for a cable stay for the throttle cable.

 

Keep up the great work!

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  • 2 weeks later...

These are the insulating spacers I made to try to help with the heat issues

 

IMG_20190416_194107.jpg.29128d85f19cb2f9af6322af4763544f.jpgIMG_20190416_194056.jpg.351dd5dd3cc7077af9c8b81f36301901.jpg

 

also treated it to new manifold to head gaskets

 

IMG_20190421_091748.jpg.2a84406f821de6813fccb91488a87baf.jpg

 

unlike the OBX setup there was no additional work to be done before installation it seems Jenvey know how to drill and tap holes all the way through and countersink as required to the right depth ( OBX take note) 

 

here is the manifold installed with vacuum pipework and fittings

 

IMG_20190421_115920.jpg.91db05796da29ea9e3334b46af63a8c6.jpg

 

and this is how it stands now

 

IMG_20190422_173926.jpg.9d4950cf045872f081b65420c5d6018a.jpg

 

I have had it running but I need to balance the Throttle Bodies and sort out the accelerator cable 

there were two things I had to do which I wasn't expecting one was shave a bit more off my filler cap nothing major

 

IMG_20190422_174407.jpg.94b702e4967c037fbba604cd9b5f150a.jpg

 

the other I wasn't expecting, the fuel rails didn't fit :scare: as per the OBX supplied rails the fuel injectors would have to be 15-20 mm longer was there a VQ fitted with much longer injectors ? I have 3 sets original UK , JAP import and GTR all the same length look at the picture not even close

 

IMG_20190421_154131.jpg.4027e58db04a6c133a71eb5277061de5.jpg

 

had to cut the mounting brackets to make them fit all ok now

 

and before I go here's a couple of pictures that showcases the difference between the Jenvey and OBX ones

 

IMG_20190421_115419.jpg.b3255336972aa3c9048b68abf7ac74c8.jpg

 

IMG_20190421_100758.jpg.bb0fe490a2f778a71169e1abe21c289a.jpg

 

:)

 

 

 

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Apologies for such vagueness,

 

Im not fully familiar with 350z yet - just bought one as a track toy.

But I bet your fuel rail issues are because they developed the kits on older 60mm Bosch style injectors whereas the ones in your photo's look like the newer, shorter 48mm long ones - perhaps your car is a facelift and thats something thats been overlooked.

 

Apologies again if Im teaching you to suck eggs or barking up the wrong tree, Im new to zeds but not Jap engines lol

 

J.

 

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