Ok I'm doing alot of work on my car right now and I'm trying to order some parts tonight, but I need to know some little known facts first. Maybe you guy's can help.

I am building a turbo manifold and I need to know the inside diameter of the exhaust ports. I have a gasket but I know that the ports are smaller than the holes in the gasket.

Ari from rx-7.com told me I could run 1600cc injectors as primarys and secondaries with my haltech, and still be able to make it Idol and not hesitate at low end. Have any of you tried this or herd of anyone doing this?

I'm also thinking about building a new intake manifold. This would relocate the injectors farther up the intake trac from the motor. Have any of you had expierence with this sort of setup? pro's or con's?

I just ordered my turbo. I specified a 62-1 with a 1.15 a/r divided tang exhaust housing and p-trim. Would it be better to run one exhaust port into each side of the divided tang, or join the exhaust ports prior to entering the turbo?

I think thats all for now.

 

Anyone???

 

crispeed
87 RX-7 TII
9.204@150.47mph
2600lbs
un-tubbed

 

the 4x1600 setup should be fine

ive seen many cars with this and they idle fine you would never know

 

Why do you need 4 x 1600 of fuel? That's a LOT of fuel... if you are running 25psi on the turbocharger you listed, you still don't need that much.

If you do get the 4 x 1600 set up, like nyt said it can be made run fine even at low rpms - you just have to have it tunned really well. Even with this in mind, smaller injectors generally will still run better at low rpms.

Check out this thread of a custom exhaust manifold build.
The guy states in it:
It's schedule 10 1.5" pipe. It has a ID of 1.68 and a ID of 1.9. The pipe ID is about the same size of the exit of the stock 13B-RE sleeve so I went with it.
Hopefully that helps you out a bit. It seems a little small to me, so I would suggest 1.75" ID for your car, unless it's a really built up engine set up, and then you could even step up as high as 2" ID.

Keep that manifold divided. Like crispeed said, better turbocharger response (ie: less lag).

By the sounds of it, you must be going for a pretty extreme car in terms of desired power output. (1600cc x 4, custom intake manifold, etc). What are your plans?

 

??? Not that I am a Rotary God but... what do you mean, "...doing alot of work on my car..."??? They’re 52mm in diameter… but, if your building a turbo manifold shouldn’t you already…ah, never mind.

That’s a whole lotta fuel you got there, son. Four 1600cc injectors, running a total of 6,400cc (assuming per/min.) of fuel, is enough to produce over 1000hp! I can’t see those large injectors able to atomize the fuel fine enough for a decent idle.

Why do you want to move the injectors farther up??? You won’t get “a decent idle”, unless you can get an ultra fine atomization and avoid the fuel from condensing or dripping down the long intake port runners… I don’t think you’re seriously thinking much at all…


The “center divide section” of a dual port turbine housing will be an obstruction when used with a single port manifold, although not saying it won’t fit. The dual port advantages only work much better with a dual port manifold. Shouldn’t you have asked yourself this question before ordering the “divided tang exhaust housing”???

Sensei

 

Generally most people use standard 2" pipe for the exhaust runners. The actual openings are much smaller but the sleeves expand to about this size. I have new machined exhaust sleeves so I use 1 3/4" runners and have more flow than stock.

Crispeed knows alot about turbos so his opinon is one to value. With standard 2" runners your turbo setup would work fine. If you were using new sleeves I'd say get the P-trim clipped for more flow. Definitely keep the runners seperate all the way into the turbo.

I do have a custom built intake manifold (a couple of them!). Moving the injectors farther away works better at higher rpms while an injector closer works better for lower rpms. I don't see any advantages to using 4-1600cc injectors. Especially not in the primary location. Yes it can be done and made to work but it won't work as well as 2 smaller injectors do on the low end. The smaller openings on smaller injectors allows the fuel to atomize better as it enters the intake. You may find that you have to run more fuel and hence a greater air/fuel ratio down low with the bigger injectors just to get the car to run correctly since alot of fuel isn't getting atomized properly. If you really need that much injector then just add 4 smaller secondary injectors. The Haltech will control it. This wouldn't be hard to do since you plan on building a custom manifold anyways. Just add 2 more locations than planned. This will all atomize better anyways. I have 2-550cc primaries, 2-1600cc secondaries and haven't maxed it out. Mine does right at 425 rwhp. I'm not Crispeed so I don't need nearly as much!

 

Thanks to all you guys who didn't have shitty comments to say after your "ah...nevermind." And I am serious about building my car. It has been in the build up process for about 2 years. Do you think the 1.15 a/r on my exhaust housing is big enough to run seperated ports? I was just asking the 4x1600 cc question to see if I could actually do this. I haven't actually made plans yet. But I do have 2 720 cc's I could use for primaries. It sounds like this would be better from your comments. If I knew how to post pictures I would put them up the way my car sat before the recent tear down. Maybe this would convince some people of how serious I am. The problem I have is my picture size is too large. Do you guys know how to remedy this? Also, what's up with these machined exhaust sleeves? Can you install them without a full motor tear down? Where do you get them? What are the advantages and disadvantages? Can you post pictures of your custom intake manifolds? I have an idea of how I'm going to do it, but all input is welcome.

Thanks!

 

The new exhaust sleeves are not over the counter pieces. I had them made and can still get them. However, you do have to have the engine apart to install them. I had a thread several months ago with pics of my intake manifold. I'll have to go search for it. The advantage of the new sleeves is far less turbulence and more velocity through the exhaust ports. Turbo spool up time is nearly incredible. the disadvantage is that they are $150 a set (of 2) and you have to use a custom built exhaust manifold that matches the same shape as the port openings. Also the added velocity keeps exhaust temps REAL high before the turbo. If you like running high boost pressures you can actually melt the turbine wheel!!! Inconel is the preferred materail but is very expensive. You actually don't need the Inconel if you just use the 2" runners even with the sleeves. It gets complicated and you only need to worry about it if you are going to use the sleeves. They aren't that scary or expensive to use I just make it sound that way.

1.15 a/r should be fine. You may possibly even go up as high as a 1.32 a/r and still have good response. I'd like to hear Crispeed's opinion on this. If you had the sleeves installed you could do the 1.32 a/r with a 20 degree clip on the wheel and still get fantastic boost response. Less backpressure and a fast spool rate = more power and more fun!

 

Glad to hear you are a perfomance serious car nut!
Yes, go with 720cc primaries and bigger secondaries (1200cc or 1600cc). You already have the primaries so you're half way there.

You can make the pictures smaller by using any photo program. Shrink them to an appropriate size, and then change them into the JPG (or JPEG) format.
If you aren't sure what I mean or how to do it, just email them all to me and I'll do it and post them for you (or email them back). bridgeported20b@yahoo.com

 

trying to do the pics thing!!

 

But that wasn't the pic that I wanted to post...and I am going to bed now. I will try to post more tomorrow.

 

nice nice

 

I know the wheels look shitty brown...he he

 

i like it...looks nice.