I am looking to increase my whp by about 50-80whp and was hoping to do it without having to move to bigger injectors, which I've begun to realize just won't happen (meaning I'm going to have to up the injector size). My setup is a t04b compressor housing (.70 A/R) with a 3076r cartridge and a t03b exhaust housing (.82 A/R) pushing 20 psi on an inline pro kit and using 675cc injectors, tuned via EMS and putting down a little bit over 400whp @ 20psi (obviously 3mm HG is used). After a series of PMs to 2QYK4U about what I should do, I've decided to pose the question to the whole forum. My options are these:
A) Buy the full race intake manifold, retune and post my results.

B) Spend a ridiculous amount of additional money to get a tubular manifold, new DP, new charge pipes, injectors/resistor box, and tune.

C) Buy a bigger turbine housing and upgrade the fuel injectors, purchase a resistor box and then retune.

Here are some obvious advantages/disadvantages with these options:

A) Advantage: at $1,420 the full-race intake manifold seems to be the biggest bang for the buck deal, unless I have to run a bigger TB and no one has told me. I've read of people in that past stating 'full race claims gains of up to 50whp are possible'. This has never been validated to my knowledge though.

Disadvantage: Only changing the IM for my setup will only allow so much more power, how much more power @ the same boost level with the same amount of fuel is unknown, and that is why I'm asking you what I should do. Disclaimer: My 675cc injectors are only good for ~425whp with my current setup.

B) Advantage: Changing my TM, DP, and charge pipes will allow for a lot better efficiency, so I can make more power @ the same psi I am at currently.

Disadvantage:620 for down pipe, 1,400 for manifold, 100 for DIY dumptube kit + w/e costs of fabricating it to make it fit would be, w/e Wastegate I'd have to run with the manifold - ~400. Then, on top of that, I have no idea if I'd need bigger injectors to support these or if it simply increases efficiency so that my power will just raise without having to require more fuel. So I'm easily looking @ 3,000 more bucks for I have no idea how much more whp, anyone have any ideas?

C) Advantage: Since I am limited, after fuel, by the size of my turbine housing (that's right its not a typical 'gt3076r'), this upgrade route would be good because it will allow for a good bit more power without having to spend as much as option B, but would only be slightly more than option A and reap more benefits from what I was told by Inline Pro. The only question is, would I make more whp from choosing this option than I would from going option A, as option A is a much more simplified option.
Disadvantage: I'd have to notch the frame, which I'm not crazy about, but will do it eventually. I'd also have to run bigger injectors which will make my gas mileage go to shit, I'm pretty sure. I think at this point I'd need some heat wrap...

So, there it is, or there they are, whichever is proper grammar. I know this is a long post, but I want to give as much detail so I can receive insightful responses and not flames. Also, if anyone has other reasonable options that I have yet to mention, please include with some supporting statements. Last note: I am a college student so price IS a bigger deal to me, I can't afford to spend another 4-5k on 'upgrades' to my already 10k investment anytime within the next year or two while keeping in mind the cost of usual maintenance items.

Thanks. -SPC Samborski

 

well if you get the fullrace manifold, your going to have to change the intake pipes, downpipes, etc as well. Its not just bolt on and go be aware of that.

I can definatly believe it will gain a good amount of power, but remember you'll have to brace it properly or it will crack like all the other tubular manifolds. Plus you'll need to heat wrap components around it.

Not saying it diss it, but 1400 dollars for the manifold is just the start of things to do to make it work.

 

I think you misread the post, I stated that I will have to buy all the items you think I am forgetting when I first introduced the idea as option B. See here:

New intake for the turbo I don't really care about listing, its not a big deal as well as a smaller battery. Yes, I know heat wrap and bracing, otherwise it will crack, thats why I'm least likely to go with option B.

 

 

Yeah I guess I read it wrong.


Option C would be the most economical but the downside is, unless you go race gas, ~500 is the max HP you'll see safely on a 3mm HG stock engine block with the inlinepro kit no matter what turbo you get. Granted a GT35R will net you some decent gains along with the larger injectors, but don't expect anything past probably 480rwhp without a built block.

 

I'm not tossing out the 3076r cartridge, just going to a bigger turbine cover for it...but the issue is that I don't know how much whp I can make with a bigger turbine cover with my current setup. I'd be completely fine with 450-470whp and then IF I wanted more in a few years, building the block and differential at that point and going for 500+ However, I'm still wanting to hit that 450whp goal and really wish anyone out there could provide some evidence of what the full race intake manifold was capable of in terms of gains on a turbo'd s2k.

 

A simple search for power numbers that members have achieved with the tubular manifolds over the log-type manifolds should provide you with all of the info you need.

However, you've pretty much answered your question already. You want 450-475 rwhp and your current injectors won't support that. Nothing you can do, will change that, whether you change your turbo, upgrade your intake manifold, crank up the boost, etc. You need bigger injectors to safely support that horsepower level.

 

Reading comprehension (and spelling) > me

 

DOn't forget that selling the items that you will be replacing will help you regain some if not most of the money you spend on upgrades. As long as you can do most of the work yourself then you could come out of this almost even.

 

Yes, I realize that I'll need bigger injectors, but it still leaves a bunch of unknowns. Such as, how much power will I gain from the intake manifold and not upgrading injectors, what about once I upgrade the injectors? How much power would I gain from simply changing the turbine housing for a T4 housing and injectors on top of that? For me, its all about calculating the #s for whp gained and cost of $ for which direction I go. I was really hoping someone with the full race intake manifold could post with some #s they put down with F/I to see what kind of gains the IM will make. I don't want to have to do 'guess work' when throwing money at my car, unlike a great deal of people on this forum I can't just sell my s2k and get a c6 vette or BMW M series car, so it is a little more complicated with my situation.

I really don't care about tubular manifolds anymore after more research, I need something reliable and not ridiculously expensive, which they are not.

Final note: I e-mailed full race with my question about their hypertune intake manifold they sell and hopefully I'll hear back from this sometime this week. If they give me any solid numbers, I will post them.