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Birth Of An Rb25

2rismo

By 2rismo,
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  • 2 weeks later...
2rismo Grand Master

2rismo

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This is how a bunch of people suggested I mount the injectors:

2rzriwx.jpg

First problem is having spacers machined up was a pain in the arse, second was how far out the injector sat from the hole in the runner and third was having the injector seal and seat properly. I grabbed a set of pre-fab bushes that use an o-ring around the outside to seat in the standard intake but even the biggest 14mm o-ring was too small to seal in them.

This meant I had to drill out the standard runners to suit the larger body of the new injectors. It has a slight taper on it now and because the injector sits further down in the runner, it now also uses the factory rubber bush from the side feeds for some extra support/sealing.

This is what it looks like now.

308jxo0.jpg

While the intake was off, I removed the barbed water fitting at the back (I hate push-on with a passion) and welded on a -6AN fitting for the water feed to the turbo. You can see it at the very back of this photo next to the back of the left rocker cover.

2hs89xc.jpg

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Also mounted the thermo fans correctly and modified the fuel filler door signage... lol.

n6z4pd.jpg

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Tuning it this Thursday.

BezerkR32 Veteran

BezerkR32

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nice work brother, fits nicely, and doesnt leak, well the front half of the car anyway.

who was the brainchild behind mounting the injectors like that? he must be very clever...............you would think he had done it before lol, with less hassle though. maybe he should get a job designing top feed injector kits for rb25......oh wait they already are available. whats that, they dont fit........you have to remove the intake runners and modify the seats, no-way.

now lets boost this eco-friendly monster.

Let's see, it's the Nissan loom with different injector clips on it...
2rismo Grand Master

2rismo

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Swapped my old e-Boost2 for a new one yesterday. Thanks Turbosmart!

The new version has sexy new features (that I won't be using) but the design is much better than my old one. The vacuum line isn't fixed into the back of the head unit and the electrical plugs are flush mounted to the backing instead of sticking out. There's also no more silver bolt poking through the back.

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Lithium Grand Master

Lithium

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Don't get me wrong - 335kw is a good level of power, but I would have thought even on a low reading DD and through an auto - 335kw would be a bit low for a built/cammed RB25 on E85 running 22psi and revving to >8000rpm? And mid 5000rpm for full boost, even with a 1.06a/r hotside? That, and the fact the power goes flat makes me wonder if something weird is going on - trans slipping, or an air leak?

Either way its clearly got the goods to go fast, but I really was kinda expecting more power than that.

Feel to set me right if I am missing something. Was there any reason you didn't go for a more aggressive boost level?

2rismo Grand Master

2rismo

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Don't get me wrong - 335kw is a good level of power, but I would have thought even on a low reading DD and through an auto - 335kw would be a bit low for a built/cammed RB25 on E85 running 22psi and revving to >8000rpm? And mid 5000rpm for full boost, even with a 1.06a/r hotside? That, and the fact the power goes flat makes me wonder if something weird is going on - trans slipping, or an air leak?

Either way its clearly got the goods to go fast, but I really was kinda expecting more power than that.

Feel to set me right if I am missing something. Was there any reason you didn't go for a more aggressive boost level?

The power going flat is a function of the big converter. It's not really going flat as much as the left side of the graph is artificially full because of the flaring converter. Air leak? You think we wouldn't have found that? Come on man. :)

I mentioned that I need more spring in the gate already (only has a 7psi spring right now) and that I can only see 21psi no matter the duty on the EBC and I made a guess at what it will do when I wind it up. No Sherlock Holmes'ing required dude.

Lithium Grand Master

Lithium

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Posted
The power going flat is a function of the big converter. It's not really going flat as much as the left side of the graph is artificially full because of the flaring converter. Air leak? You think we wouldn't have found that? Come on man. :down:

I mentioned that I need more spring in the gate already (only has a 7psi spring right now) and that I can only see 21psi no matter the duty on the EBC and I made a guess at what it will do when I wind it up. No Sherlock Holmes'ing required dude.

Haha don't worry, I figured there was more to the story than I picked up on - but you gotta know to understand :P The converter thing makes a lot of sense, I've not really been exposed to them before but have seen quite a few dyno plots from auto cars which look like that... hadn't really thought too hard about it so cheers for the explain.

Sounds good, and sounds like there is more party to be had which makes me happy - looking forward to hearing what she does when you hit the strip with the latest setup!

2rismo Grand Master

2rismo

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Haha don't worry, I figured there was more to the story than I picked up on - but you gotta know to understand :down: The converter thing makes a lot of sense, I've not really been exposed to them before but have seen quite a few dyno plots from auto cars which look like that... hadn't really thought too hard about it so cheers for the explain.

Sounds good, and sounds like there is more party to be had which makes me happy - looking forward to hearing what she does when you hit the strip with the latest setup!

Check it out :)

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