Aftermarket inlet manifolds (for injection)

[Murph]

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

Yeah your name is Dave right?!

Cam is a baby Crow 58643

Nice. I just wanted to get an idea of what a relatively stock L series will do with some boost. Seems like they respond quite well! I have your cams big (but still small) brother sitting on my desk here (58640).... Will be interesting to see how it goes. Should still be small enough to be suitable for my future forced induction plans too.

[thehelix112]

Remember, you want to match the cam with the exhaust manifold, turbine A/R, exhaust size.

The crow cams appear to have a fair amount of overlap (but very low ramp rates so it doesn't really matter). Next cam I get will be in the 230-240 0.05" dur range. Should be more suited to the GT35R 0.82 housing and we'll see what it'll do.

Dave

[Murph]

Keep us updated when that happens.

For my initial setup on the L26 I wont be too concerned if it's not perfectly matched. I'll only be running low boost on that, pretty much as a bit of a shake down for the setup, make sure it all works well. Later on I'd look and spending some $$ on a tough motor....and of course that'll have a cam to suit.

Anyway...that's all a few months off at least. :-/

[thehelix112]

Sounds like it'll be fun still. What turbo are you planning on? What ECU? What cooler?

Dave

[Murph]

No turbo. Whipple 2300.

Cooler = water air

ECU = Not sure. Possibly (call me mad) nissan RB20 ECU. My mates have all the gear for reprogramming these, and are currently developing a setup to allow you to do it on the fly, without using an EEPROM emmulator, just using the consult port. What will make it a little more difficult it adapting the CAS to where the dizzy was. Has been done before mind you.

[Murph]

Actually, scratch the RB20 ECU idea.....I'm getting projects mixed up. I'll need something using MAP for the load input. I'd definitely be looking at Autronic.

[Bubbleguinea]

OK guys, a few things....

a. its not steel, the website is wrong. its just as heavy as the old one...

b. this is NOT a turbo designed intake. the runners are 9 1/4 in long, SUPURB for low RPM, which is what i want for a street car. SDS is the ECU im going to use.

the car ran a 14.6 without flatops or any of this "new" stuff.

im more than confident the car can hit 13's. you'd be surprised what higer-compression, supurbly flowing EFI manifold, and SDS can do...

[thehelix112]

If its not a FI orientated intake, then why are you bothering compromising the velocity stack radii, adding all that weight, reducing tunability, bringing flow distribution into question, etc by not running individual throttle bodies on the end of plain-jane runners?

As a matter of interest, what does the manifold flow @ 25"Hg?

Dave

[thehelix112]

Oh and if its not steel, is it alu?

Dave

[SteveK]

im more than confident the car can hit 13's

You can be as confident as you want -- doesnt mean it will happen

supurbly flowing EFI manifold

Where are the flow figures comparing this to say the stock manifold and AN other make such as a JDM unit or even an off the shelf canon "plain jane" manifold

you'd be surprised what higer-compression

High compression means jack if your fuel atomisation, spark, cam, squish, head, header, collector -- et al dont all work together.

That manifold is designed to take big pressure, look at the design its a pressure vessel, the plenum inlet is way to restrictive for a NA application

Measure the diameter of your plenum chamber inlet -- how big is it

I found that on my airbox that anything under 80mm began to compromise performance and at 65mm it ran like a Honda (thats on an engine making 250 HP at the fly)

NA performance is reliant how much volume of air/fuel you can get into the cylinders, with as little resistance/effort as possible the smaller your main tract is, the harder the engine has to work to pull it in.

Its an unfortunate car tuners trait that they sometimes assume HP by the hole left in their wallet

[thehelix112]

Its an unfortunate car tuners trait that they sometimes assume HP by the hole left in their wallet

Couldn't agree more Steve. But then, even people who put the effort in themselves aren't not likely to be happy taking criticism, and they should be the ones who are more aware of any short-comings (from performing the design) as opposed to someone who just brought a product.

Dave