Just wondering, what's out there in the way of aftermarket inlet manifolds for injected L series motors? For that matter, how well does the L28 manifold flow? Is it any good at higher power levels?

The motor in question would have forced induction, aiming for around 450HP.

well forced induction the stock intake is OK.

but for a NA setup, the SU intake is even better than the EFI!!!

ive got a new Lonewold Performance intake, with 9.25 inch runers, a HUGE pleum, velocity stacks, and lots of other goodies. i hope it flows excellent! only $500!

it you are going turbocharged, the stock intake is fine for you...

The stock Nissan plenum manifold was built primarily with economy and emmisions in mind and it is only when it is used with forced induction(turbo , Supercharger etc) that it begines to work. There is a guy in the UK with a twin turbo'd L6 kicking out the best part of 400 Hp, using the stock plenum (trouble is he drives like a girl and wont come out to play (sorry Mark). I have some pics of it at a show, I will put a couple in my gallery(subject to approval) his are the ones in the sunshine, mine is the one with red throttle bodies.

G'day guys! Thanks for the responses. Gotta start by saying I love your engine bays and engines detailing! Awesome jobs on both.

Bubbleguinea: Love the colour combo on your engine!

I gather that lone wolf intake is a modified L28 item ya? What exactly do they change?

SteveK: That intake and exhaust setup you have there is pure automotive porn! Love it!

So as a general rule, a cleaned up L28 manifold will do a pretty good job on a big HP forced induction motor?

The reason I'm looking down this avenue is because the engine in question will be supercharged, not turbocharged. With this supercharger, it'll be operating somewhere toward the higher boost pressures that it can push efficienty, however somewhere around the middle from a airflow point of view. So getting any extra HP out of it will be a matter of making the whole system flow as well as possible, just as you'd do with a NA motor.

dont worry about switching out intake manifolds if you are going turbo.

trust me.

you want to see automotive porn? check back in a second..il post a pic of my new manifold.

there she is. tell me you didnt just wet your pants. now THAT sucker with 1.5 inch runners would be SSSIIIIIIIIICCCCCCCCCKKKKKKKK for a turbo setup.

Ohhhhh that is absolutely sweet, and pretty much direct port injection too.

Man if I ever did my dream short stroke L6 on a supercharger then thats the induction set up for me.

Good find

Bubbleguinea: Nice! Very nice!

Now...I am always a little weary of aftermarket inlet manifolds, as often there hasn't really been much thought, development or testing put into them, resulting in an uneven distribution of flow to each runner. Do you know what sort of development this manifold has been through? Are there any figures/dyno charts etc available to back it up?

Any chance you could take a few more pics of it for me please, including the inside of it if possible.

Cheers,

Justin

check the thread below this one, there are pleanty of pictures...

go to www.lonewolfperformance.com

talk to james, a LOT of testing and research went into. there ARE dyno numbers on a turbo, without this intake, and with it. +53 HP was the difference to the wheels...that along with tuning.

the stock intake is a HORRIBLE design. if we had two exact same engines, both L28, but one carb, and one EFI, the carb would would make more power cause the carb intake is actually less restrictive than the EFI one.

this intake is going to be INSANE on my setup. flatop pistons, SDS, this intake...im looking at high 13's in the 1/4

Bubbleguinea

Nice as it is

Do you intend to use that in a normally aspirated set-up

I ask because

A. Surely its built primarily as a forced induction set-up which doesnt neccassarily make it good for normally aspirated

and

B. Your target time of the high 13's is fairly unambitious for a turbo, but highly ambitious for an NA car with single throttle body.

I base my data on the fact that I have run a 13.7 1/4 in an 240Z which is an NA set-up using individual throttle bodies and a fully mapped distributorless, ignition system. High to mid 13's in an NA car are significantly hard to achieve and it took 8 months of engine/head/header/collector configuration, building and tuning/mapping to get the 200 Hp at the wheels (250.5 @ the fly) needed for a car weighing 1150 kilos (car, me and fuel) to break into 13 seconds (its a UK record thing we dont get out much :stupid: )

That is unless your US 1/4 miles -- like your gallons are differant from the rest of the world

^^^^^^^^^^^^

What he said.

Also, website says they are steel? Steel is heavy. Get someone who can fab them in alu. Also, direct port is not necessarily a good thing. The longer the fuel has to atomise the better. Injectors want to be up the runners I think.

Dave

Dave: Is your manifold stock? Match ported? Deburred?

Is you engine internally stock? Cam? What's your estimated current power output @ what boost pressure?

Ok...I'm done with the questions.

Datto-Zed,

I'll assume you're talking to me, sorry for the hi-jack everyone.

Manifold is stock, no match porting, no internal deburring, that being said, it looks pretty clean in there to me. All it has had done is bead blasting because it was very dirty (and full of crap) when it came off the 280zx. Engine is internally stock. Cam is a baby Crow 58643 (http://www.crowcams.com.au/templates/Catalogue-Datsun-OHC.shtml)

I have no idea on power output, but most HP calculators give me around 320fwhp on 10psi assuming 1115kg weight (very optimistic). Calculated from 115mph trap speed.

Dave