300hp Street Setup

[90GSX17]

I'm looking to make 300hp on a stock motor. The previous owner of this Talon I just bought has a apex-i turboback on it, but it's not a 3in like I thought. The downpipe measured in a 2 1/4 and the rest of the exhaust system was 2 7/8! By switching to a true 3in downpipe and and exhaust system will this bump up my power a tad bit? i'm trying to squeeze everything out of the stock turbo and manifold etc. So i've put a list of mods, will a stock clutch hold 300hp? Mods are as follows

Redo Exhaust to a True 3in turboback
FMIC
ported stock turbo manifold
ported o2 housing
ported 14b
ported intake manifold and throttle body
(already have boost controller) turn boost up to 17-18psi
SAFC
Walboro 255
AFPR
Will that reach 300hp or will cams be needed?

 

[dr1ftx3]

Are you talking about horsepower to the wheels or what?

 

[TSiTech]

With the mods i see, 300 isn't to far out of site. I would suggest a nice intake setup, a front mount, and that 3 inch exhaust. The more air that can move in and the more exhaust that can exit, the better off. Also you can crank the boost up a little more, like 20-22 you'll hit your mark.

 

[FORMONTOYA]

And what injectors are you planning on...at least a set of 550s, right?

 

[donmagicjuan]

300 awhp is a LOT to ask of a 14B. You will need a near expert tune and a lot of octane to get there. Keep in mind that speculating how much power you will get with a certain list of mods is known as bench racing, and it's against the rules of this site. The only way to know for sure is to take it to a dyno. Good luck with your setup.

 

[mygsx2120]

A stock clutch will hold 300hp, but not for long. Especially with thoses oh so fun AWD launches. Might as go ahead and step up the clutch now. No point in making it fast, just to break the clutch in a week. I just put in an ACT 2600 with a street disk in my gsx. I absolutely love it. The added pedal pressure is not too bad, and it is not excessively grabby.

 

[JayRolla]

I agree to make it easier to hit your mark I would look for a small 16g or bigger. They are perfect for about 300whp on pump gas, anything past that is a fight. But injection of some sort helps that.

 

[matt j]

what i would add in as said above will be a set of cam gears, a clutch, a set of 550s and some 116 octane gas on 22psi of boost, then you should be damn close to that 300awhp mark. I am trying to do the same thing right now (actually i just want to be the first one in my home town here to run mid 12s on a 14b). I am also porting my intake and exhaust manifolds to gasket match just for a little bit more power.

 

[91etalon]

what i would add in as said above will be a set of cam gears, a clutch, a set of 550s and some 116 octane gas on 22psi of boost, then you should be damn close to that 300awhp mark. I am trying to do the same thing right now (actually i just want to be the first one in my home town here to run mid 12s on a 14b). I am also porting my intake and exhaust manifolds to gasket match just for a little bit more power.

cam gears wont do anything with stock cams, so scratch those, also you dont need race gas nor do you need 300 awhp to run 12s. i modified your list to help you reach your goal.

Redo Exhaust to a True 3in turboback
FMIC
act 2600lb clutch
act 12lb flywheel
ported 2g manifold
ported o2 housing
evo 16g
stock 1g intake manifold and throttle body
(already have boost controller) turn boost up to 20psi
SAFC
Walboro 255
AFPR
PTE 680cc injectors
2g mas airflow
bpr7es ngk spark plugs
home depo intake
boost gauge
data logger

 

[MyBeatGSX]

Did anyone else notice something.... his exhaust is 2 7/8 inches. What do you think he's going to gain by getting one that's 1/8" bigger? The DP can't be 2 1/4", no one makes a 2 1/4" DP. Maybe the first bend, but that's fairly typical.

I redid this list again...

FMIC
act 2600lb clutch
Evo manifold (like $10 more than a 2G)
Tubular O2 housing (ebay, cheap cheap)
evo 16g
stock 1g intake manifold and throttle body
DSMlink
Walboro 255
AFPR
PTE 680cc injectors
2g mas airflow
bpr7es ngk spark plugs
Dejon/ExPsi/Ebay whatever metal intake pipe
boost gauge

The money you saved by not getting a new exhaust (~$800), not getting a flywheel (~$250), and not getting a datalogger (~$150) can be put into DSMlink (~$500?) and your repair fund that you will need.

 

[toomey200]

I dont know too much but with ,my evo b16g i was recomended to use 550cc injectors. Wont those 680s be a little much or not needed? Besides the 550s are a little cheaper depending what you plan on doing down the road.

Let me know what you guys think about the 550s instead.

 

[MyBeatGSX]

550's should do 300whp just fine. But if he goes with Link like I recommended then there's no reason not to go bigger (aside from price). But whats $40-50 over the course of a couple years and preventing you from having to buy bigger later?

 

[91etalon]

550's should do 300whp just fine. But if he goes with Link like I recommended then there's no reason not to go bigger (aside from price). But whats $40-50 over the course of a couple years and preventing you from having to buy bigger later?

yeah 550s will do the job but i really dont see why not go bigger. like you said price difference is only 50 bucks and you wont have to upgrade if you decide to go with a bigger turbo set up. mine were only $260. i was running the PTE 680ccs on a regular big 16g with a 2g mas and just an afc to tune and they worked excellent. i only did a mild tune on the car and i had a steady increase in timing up to 28 degrees and a max of 2 counts of knock around 5200 rpms. this on 91 octane and 20 psi.

 

[NewTurboTuner]

Whhaaaaaa???

""speculating how much power you will get with a certain list of mods""
.......Is against the rules???

It may be a rule, but that's freakin crazy talk!! WTF The whole website is about improvement. Talking about improvement.... how it will be improved, or what will be improved... ect ect. Not being able to say I hope I get X hp, with Y part silly.

I just wish the Mods would loosen up a bit. gggeeeeeez!
ok ok ....rant mode off
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I dont think Race Gas is very street car like

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90GSX17
If you're talking about a 300wHP goal ....that's going to be hard with a 14b.
If you stick with the 14b, you'll most likely need cams to make 300whp. Even then it could be harder than you think.

Work on the Exhaust 1st.
Maybe do a 2.5 down pipe, and then 3" exhaust.
I think a 3" DP will be a little too big for a 14b.

You'll have to go all-out with supporting mods to get 300whp with a 14b.
If its 300whp you're looking after ....It might be possible to upgrade to a EVOIII, and spend less money for 300whp, Because you wouldn't have to go all out with everything else .....does that make sense? (You could spend $650 on a exhaust to get 15whp, or you can spend $650 on a EVOIII to get 80whp) ....see what I'm saying?

If you ultimate goal is 300whp period, End of story ....Then consider loosing the 14b, and upgrading the Turbo.
If you ultimate goal is to make as much power as you can with a 14b ....it might cost more, but it is possible.

SB

 

[donmagicjuan]

Steve,

I'm not saying that asking the question "what will I need to get 300 hp?" is necessarily bench racing, but it's a very subjective question that will often digress to exactly that in a matter of minutes. For the site's complete definition of bench racing, read this.

 

[gsxAWDdsm692]

Those exhaust sizes sound a little fishy to me.

 

[crazy_skier]

umm question, how did you measure the exhaust, I mean it could really be a 3" if you measured it incorrectly you know??? the best thing to do would be measure the circumference and then figure out the diamater.

 

[MyBeatGSX]

I mean it could really be a 3" if you measured it incorrectly you know??? the best thing to do would be measure the circumference and then figure out the diamater.

ITS AN EIGHTH (1/8) OF A FUGGING INCH PEOPLE!! Who cares if it was measured correctly or not, a couple hair widths isn't going to make a difference in flow. That 1/8" wouldn't even be within the repeatability of the math calculations depending on what you use for pi.

 

[nc90awd]

if its a apex-i exhaust it will flow a lot more than 300whp. people run 450hp+ on those things all the time

 

[flashburn02]

If it is 2 7/8" then perhaps he measures the inside of the pipe?

I also want to support switch to a 16G.

 

[FORMONTOYA]

It's 2-7/8 as the Apexi unit is actually measured in millimeters (similar to a HKS), and that's just how the conversion works out, not inches as with a lot of other manufacturers.

And as stated, 1/8" isn't going to make a "hill of beans" difference. Don't waste time or money on an 1/8".

 

[90GSX17]

I know it sounds kinda of stupid with the 2 7/8, but i'm trying to squeeze every inch of power out of the car, but if it really won't help then I won't worry about it. I'm damn sure I measure the downpipe right and it's 2 1/4 don't know if it's a apex-i or not, but it's gotta go. I'll think about switching turbos, but the whole point of doing this wasn't to just get 300hp, It was to get it on a 14b any idiot can make 300hp on a EVO 3 16g, some people just like more of a challenge I guess. Thanks for the all input though, and i'll let you all know what I finally decide to do.

 

[fourreGsixty3]

Dont port a 1G exhaust manifold, they are prone to cracking before porting them, what do you think will happen if you make it thinner?
This is the mod list I would go with, but I doubt it will be 300hp capable on pump gas.

~ACT 2100 w/ street disc(all the power in the world doesn't mean anything unless you can get it to the ground)
~Dejon tool air intake pipe
~K&N air filter
~EVO 3 exhaust manifold and port it
~extrude hone the 1G intake manifold
~FMIC(the stock SMIC will be heat soaked from pushing the 14B past its efficency range)
~ use your MBC and turn the boost up to 18psi for pump or 20+psi on race gas, the added octane rating will help be a detonation supresent to going higher boosts and hotter intake temps)
~that 2-1/4" DP sounds stock sized
~port the o2 housing
~wally 255 rewired for a steady voltage
~AFPR w/ guage(set to 43psi off boost)
~boost guage(stock one isn't accurate)
~FIC 650cc injectors (bigger the better here, low IDC allows for more tuning room)
~S-AFC II or DSMLink, either one you get get a logger to go with them to monitor engine vitals like knock count, ect... (If you go larger then 660cc injectors DSMLink is needed)
~NGK BPR7ES plugs
~go with a set of cams to let the turbo breath in the top end
~get a good tune, and you will come close to your goal with 93 pump, and you will pass it with race gas
~if you have a cat get a test pipe for the dyno run
Follow this guide>>http://www.dsmtuners.com/sub.php?page=1gtstage1power

Dustin

 

[fourreGsixty3]

2g mas airflow

Can you justify spending the money on this? The 1G MAS can flow more then enough for the 300hp.

Did anyone else notice something.... his exhaust is 2 7/8 inches. What do you think he's going to gain by getting one that's 1/8" bigger?

I agree with this, the gains would be unnoticable.

what i would add in as said above will be a set of cam gears, a clutch, a set of 550s and some 116 octane gas on 22psi of boost, then you should be damn close to that 300awhp mark. I am trying to do the same thing right now (actually i just want to be the first one in my home town here to run mid 12s on a 14b). I am also porting my intake and exhaust manifolds to gasket match just for a little bit more power.

Cam gears? Those are not needed, unless you have aftermarket cams, and are trying to extract every bit of power possible. Also what are you going to use to control those 550s?

Also this option would be cheaper then a DSMLink or S-AFCII. Get an EPROM ECU/Keydiver chip with a custom timing and A/F maps. That will be cheaper then getting just the DSMLink.

Dustin