Ok, as some of you may know by now, I'm planning on making more power out of my car by going with parts shown to help increase intake or exhaust flow.

Now for the intake, I've already purchased the O2 induction manifold. However, on the exhaust side of things, I really don't know what to do. The turbo I'm currently using is a 0.64 A/R GT2871R bolted to the stock S13 manifold on one side and a 3" turbo-back exhaust. I've been looking at various aftermarket turbo manifolds, but I can't decide as there are too many of them around, although I've been eyeing on the Megan Racing manifold, mainly because Megan Racing has in the past few years proven to make parts that last a while while providing good power production.

Meanwhile, I also talked to the guys at Pro-Tech Fabrication about their RWD shorty manifold that allows for going with an external gate. They say that their manifolds have been proven to show dramatic increase in power compared some of the competitions' products out there. They said they could weld on a T2 flange on their manifold so the turbo sits right when topmounted. After going into some serious thought, I think this approach is not worth it to me because first of all, dowtime is going to be too big for me to handle (sending in the the turbo to weld the gate shut, for example). Second, I'll have to redo everything I have exhaust-wise just to go external gate on the GT2871R, and the money put in probably won't account for the power I will make out of this.

Anyhow, here's where I am seeking guidance from my fellow forum members. What would you guys recommend going with in place of the Megan Racing turbo manifold that I am looking at purchasing? Also, is there really a big power difference between the stock manifold and the aftermarket alternatives? All input will be appreciated.

I think you should look into cams instead of worrying so much about the exhaust manifold.

Like you said, you have already gotten everything to mount it in the stock location, with internal gate in mind, so why not just roll with it?

There's a guy on FA that had his stock turbo manifold extrude honed, and he's also got the .64 A/R GT2871R. With JWT S3 cams and I think the Greddy intake manifold, he put down around 400rwhp, with a ROM tune.

See, I already have cams. I'm using the HKS Step 1s, which I believe are something like 264 degrees duration and 10.5 mm of lift. Lopey as heck even with the rather lame lift figure. I don't know what the specs on the S3s are, but if they're close to what I already have, then cams are something I've already taken care of.

Extrude honing isn't a bad idea. I never thought about that. I guess I need to get my extra manifold sent out for that.

ECU tune - now that's what I'm unsure of if I need to work on it or not. I never did a reprogram of the ECU since the only upgrade I've done since the tune it currently has is replacing the GT28R with the GT2871R. I have done nothing major that I feel would require finicking with the ECU. My ECU is an Enthalpy-tune programmed for 850cc injectors and 300ZX TT MAF. On the dyno with this tune and the GT2871R, my A/F looked pretty good, more on the rich side of things, which is exactly where I want it to be.

Now all I really want to look into is the power/cost difference between the Megan Racing manifold and an extrude honed stock manifold. That's key at this point, I guess.

SSAC suck, waste of $200. Lose low end and midrange and gain 2 hp. Go tomei expreme it only like $150 more than extrudehone your stock and it comes with heat wrap and new gaskets for that price.

Jeremy

I haven't mentioned SSAC anywhere on here. I am more than aware of their product-suckage. Megan Racing makes quality stuff. I know that from dealing with enough of their products, from suspension to exhaust stuff.

I haven't mentioned SSAC anywhere on here. I am more than aware of their product-suckage. Megan Racing makes quality stuff. I know that from dealing with enough of their products, from suspension to exhaust stuff.

The Megan Racing exhaust manifold is the same stuff as the SSAC stuff.

Looks the same, feels the same, and costs about the same.


Anyway, "step 1" HKS cams just means that they're drop in cams, not needing to do valve springs and such. Step 2s require valve springs, and step 3 cams require solid lifter conversions.

You could either have 256* duration cams or 264* duration cams for the step 1s.

Either duration HKS step 1 cams, however, feature 10.5mm lift for intake cams, and 10.0mm lift for exhaust cams.

JWT S3 cams are 260* duration intake and exhaust, and 11.2mm lift intake and exhaust.

I know what the "Steps" mean, but the refresher is much appreciated. :)

I looked into what cams I did get. They are the 264s. S3 might just happen if I'm looking at better duration and lift without having to upgrade the valvetrain.

Also, looking and feeling the same doesn't mean the Megan Racing piece will crack as easy as the SSAC one, does it? What I'm getting to it is that I haven't seen anyone complain about the Megan Racing variant, yet.

If you don't have an intake manifold you can always get one. I suggest the O2 induction if you want something top quality, or the Greddy for something midrange. The manifold will cause the engine to make more power on the big end (6000+) via various methods.

Even with Step 1's you'd probably pic up 5-6whp in the top RPM by running valve springs. If you have a stock port head it's not worth the increase in lift, and a longer duration may not be very suitable with such a high backpressure turbo.

The exhaust manifold is a crucial piece of equipment when it comes to making power out of the engine. Spend the money there, where it counts.

BTW, you never responded to my PM.

SSAC doesnt mean "crap". you see a low price which means more cheap-asses are prone to buy it. with most cheap-asses, you get cheap and shoddy work done in other aspects of the car. most people that had a problem with their SSAC manifold (that ive talked to) did not hang their exhaust right, and also werent the brightest of people. not to mention SSAC does not manufacture their product, they merely sell it. ive had one on my car for almost 2 years with absolutely no problems, and the price was nice for me because i plan to go topmount soon, though ive been planning that for a long time now lol.

how much power are you looking to get? alot of which mod you do next relies on whether or not you want a nice, quick, daily driver or are you planning for a track car? the greddy intake manifold will drop your low end power but will raise your top end. look at some stuff on zilvia, alot of the guys suggest waiting until upper 300 hp before going that route, granted it you dont mind the low end loss, go for it.

how much power are you looking to get? alot of which mod you do next relies on whether or not you want a nice, quick, daily driver or are you planning for a track car? the greddy intake manifold will drop your low end power but will raise your top end. look at some stuff on zilvia, alot of the guys suggest waiting until upper 300 hp before going that route, granted it you dont mind the low end loss, go for it.


On my last dyno run, I hit 330 hp and 322 lb-ft tq @ 19 psi on 91 octane. I am looking to produce 400 whp when all is said and done. I've seen guys with the same turbo as the one I have do it, albeit with a Greddy intake manifold. I am really hoping to see a bit more than that with the O2 induction intake manifold I just purchased. Only time spent on a dyno will surely tell.

Speaking of low end loss, the turbo lag is already there. A bit more due to more air going in to make more power is something I don't really mind very much, as long as the loss won't be as bad as if I had a turbo larger than my GT2871R.

SSAC suck, waste of $200. Lose low end and midrange and gain 2 hp. Go tomei expreme it only like $150 more than extrudehone your stock and it comes with heat wrap and new gaskets for that price.



Jeremy

Sorry, I meant Megan, but they are the same, just look at em crap.

On my last dyno run, I hit 330 hp and 322 lb-ft tq @ 19 psi on 91 octane. I am looking to produce 400 whp when all is said and done. I've seen guys with the same turbo as the one I have do it, albeit with a Greddy intake manifold. I am really hoping to see a bit more than that with the O2 induction intake manifold I just purchased. Only time spent on a dyno will surely tell.

Speaking of low end loss, the turbo lag is already there. A bit more due to more air going in to make more power is something I don't really mind very much, as long as the loss won't be as bad as if I had a turbo larger than my GT2871R.

Porting the cylinder head and running some S4 or bigger cams would be the best solution along with a good exhaust manifold. Run that on race gas and you should be pretty damn close if not over.

Does the O2 manifold use the factory TB placement (ie. no cold pipe mod) ? If so I'll probably buy one sometime soon.

Megan and SSAC both = Motoria.

I had a SSAC/Megan/Motoria manifold on my 240's KA engine, when I bought it. It lasted about 1 year before developing a nice crack in the collector, almost directly under the turbo. This was *after* the previous owner had a reputable shop weld in supports to the collector.

That was enough for me.

Harris, like the other guys said, look into extrude honing your existing, cast manfold. Different cams and/or cam *timing* should be looked at, too.

I haven't mentioned SSAC anywhere on here. I am more than aware of their product-suckage. Megan Racing makes quality stuff. I know that from dealing with enough of their products, from suspension to exhaust stuff.

Ah. I love it! coudnt have put it better myself.:rofl:

Megan and SSAC both = Motoria.


That's a first one for me. I had no idea this was the case. Well, stock manifold it is.


Harris, like the other guys said, look into extrude honing your existing, cast manfold. Different cams and/or cam *timing* should be looked at, too.


Advice taken and appreciated. I have an extra manifold that will go in for extrude honing as soon as I get hold of my guy back in Ohio who can do this for me. I have my O2 manifold sitting here, and Im just waiting on the Q45 TB so I can install it and dyno the car right away. I'm crossing my fingers really tight on reaching my 400 whp figure.

Just to make sure, if you are having the mani honed by "extrudehone" it is about 450$. mIght as well get the Tomei expreme for $550. It comes with heat wrap and new gaskets and it is the bomb.

My .02

Do you have a link fro?

I link for what the tomei?

Best bottom mount IMO for only $555 delivered to soacl, not sure about shipping to other states

http://www.nengun.com/tomei/expreme-exhaust-manifold-nissan-silvia

If you want the Tomei manifold PM me, I can get it from Japan.

Edit.

Well it looks like my price has gone up. Nevermind.