14b [How much boost?]

[FaTtUrBo]

I was wondering how much boost i can run on stock internals with a 6bolt 4bolt and what i might beable to run. If theres any more little mods i can do to up my horsepower. If i got a boost controller to how much psi?

 

[Xplicit93AWD]

well bone stock car i would recommend at least a fuel pump 190 lph or 255lph depends on your future mods before you go putting the boost up i will be hearing from you later about either a blown headgasket or worse motor if u dont also try checkin out free mods and step 1 in the tech section

 

[S_Ranger]

13-14 safely bone stock. Yes, fuel upgrades would benefit you.

 

[dsmsucks]

I was wondering how much boost i can run on stock internals with a 6bolt 4bolt and what i might beable to run. If theres any more little mods i can do to up my horsepower. If i got a boost controller to how much psi?

First off get a logger and see how much you can increase the boost with little to no knock! 16psi max for stock set up seems to be the golden rule around here
You can run 20psi on the 14b, you just need some supporting mods
190lph pump
injectors
logger
intercooler
exhaust
Oh yeah, this topic has been asked MANY times

 

[boostdog]

i have run 21psi on my 91 with a 255lph pump upgrade. joe bucci has ran 25 psi but with a few other mods.

 

[dub2gsx]

Don't do anything untill you get a boost gauge You will also need an SAFC I or II (go with the II if you can) so you can control the fuel. You may not need the injectors. I've seen a lot of people run with stock injectors on the 14b but they were pushing it. on the fuel pump also rewire it or it will do almost no good! You will most likely run into fuel cut so get new plug wires, plugs, & fuel filter. Intercooler isn't a must but will help later! Exhaust, downpipe, intercooler pipes, if i left anything out some will tell you!!

With all that you should run damn good!

 

[4g63t]

I can run 23psi with 91pump gas with Fic 650 and 255 lph fuel pump and a AFPR thats all I got for my fuel set up. You do not need SAFC I or II untill you want bigger injectors. Rely you can run as much boost as you want as long as your timing isent getting pulled because of knock...

 

[dub2gsx]

Turning up your psi isn't gonna do much untill you get the supporting mods. Each supporting mod you get you can tell a difference, esecially the exhaust!

 

[Ultimatedsm]

To run over 18 psi, I recommend getting an intercooler upgrade because at that point its blowing hotter air. With a walbro 190LPH and 550 cc injectors you can easily do 22 psi with proper tuning of course.

 

[dsmsucks]

22psi on a 14b . Man thats TOO much, if somebody wants that much psi they should upgrade to a 16g or bigger!!

 

[napkinthief]

get a safc2, a boost gauge, the 14b, a 190 or 255 pump, injectors, and a mbc. thatll run you about 500-700$ if you get em used.

 

[Talesin]

As noted, follow the upgrade guides posted handily on this very site. Tech Guide link at the top, just to the right of 'home', with the 'increase horsepower' link for 1G turbos.

Also, once you are ready to go to larger injectors, I would recommend DSMLink instead of an SAFC I/II. Idles better, gives much finer control, better tune overall, and is only about 150% the cost of a new SAFCII, if you already have an EPROM ECU. Most with SAFCs end up switching to DSMLink (or a standalone EMS) when they're ready to make some real numbers... I'm of the 'do it right, only buy it once' mentality, instead of trying to re-sell your previous upgrades when they prove to be sorely lacking.

 

[a73_4g67]

With all the fuel mods, FMIC, racing fuel, no knock on the logger, whats the most boost you can do on a 14B? What I'm thinking is I might be overrunning the turbo.

 

[andymoraitis]

Alvin,

There's a mod on our site who's local to me and he used to run 22-24 psi on the 14B without issue. As a number of people mentioned above, I would invest in a 190 pump (255 is overkill and requires an AFPR), 550cc injectors and a way to control them. I'm an EPROM ECU proponent, but for 550's the correction factor on the AFC isn't so much that it skews the timing out of working range. Talesin also has an excellent point that since you already have an EPROM ECU, it would be worthwhile to consider DSM Link. Drop them a line and see if their chip will work with the JDM GVR4 ECU.

I understand your issue and can tell you that at a certain point, you can overrun the turbo as I'm near that point now on the 16G and at 24 psi, you'll likely be at that point on a 14B. On a final note, tuning for no knock is still a rich tune. I'd like for you to tune for 3 counts of knock towards the top of third gear so that you can safely see what the limit is on your tune. Zero knock still falls on the rich side and if you don't know where knock is induced on a small scale, you'll still lose performance from being rich.

Like we've discussed, I think your goals will be much better met by grabbing a 16G variant as you can run this at 26 psi with proper fuel support. I know you've had trouble getting one, but it's your best option.

Drop me a PM and let me know how things are going when you have a chance.

Andy

 

[boostdog]

22psi on a 14b . Man thats TOO much, if somebody wants that much psi they should upgrade to a 16g or bigger!!

Why? Pressure is pressure! 22 psi on a 14b is the same as 22psi on anyother turbo...that makes no sense at all!

 

[a73_4g67]

Alvin,

There's a mod on our site who's local to me and he used to run 22-24 psi on the 14B without issue. As a number of people mentioned above, I would invest in a 190 pump (255 is overkill and requires an AFPR), 550cc injectors and a way to control them. I'm an EPROM ECU proponent, but for 550's the correction factor on the AFC isn't so much that it skews the timing out of working range. Talesin also has an excellent point that since you already have an EPROM ECU, it would be worthwhile to consider DSM Link. Drop them a line and see if their chip will work with the JDM GVR4 ECU.

I understand your issue and can tell you that at a certain point, you can overrun the turbo as I'm near that point now on the 16G and at 24 psi, you'll likely be at that point on a 14B. On a final note, tuning for no knock is still a rich tune. I'd like for you to tune for 3 counts of knock towards the top of third gear so that you can safely see what the limit is on your tune. Zero knock still falls on the rich side and if you don't know where knock is induced on a small scale, you'll still lose performance from being rich.

Like we've discussed, I think your goals will be much better met by grabbing a 16G variant as you can run this at 26 psi with proper fuel support. I know you've had trouble getting one, but it's your best option.

Drop me a PM and let me know how things are going when you have a chance.

Andy

Andy,

Thanks for the quick reply. I got your point on the knock issue. The leaner the mixture, means better performance. I've read somewhere, that a few counts of knock will still advance the timing, a few more will keep it steady and more will retard it. We lost again the bidding to the Big 16G. Maybe we'll save more and just buy a new Evo 3 turbo.

 

[dub2gsx]

Why? Pressure is pressure! 22 psi on a 14b is the same as 22psi on anyother turbo...that makes no sense at all!

Don't forget CFM!!

22psi on a 14b and 16g is totally different! The 14b is near or out of it's fficiency range while the 16g still has quite a bit more room to grow!! Say at 17-18 psi the 14b will not push as much cfm as the 16g! It's all about the turbo efficiency!! My t-25 can push 22psi but it will just blow hot air and has inferior cfm comparred to even the 14b!

 

[BoostedTalon95]

Why? Pressure is pressure! 22 psi on a 14b is the same as 22psi on anyother turbo...that makes no sense at all!

What are you talking about? So what you're saying is that I could set a T25 to 15psi and it would be the same as a 16g at 15 psi? I'll leave it at that.

 

[Quasimondo]

Why? Pressure is pressure! 22 psi on a 14b is the same as 22psi on anyother turbo...that makes no sense at all!

You also have to remember that this boost pressure is not static, it's not like the intake manifold is being pressurized like a balloon. That 22 psi is while the engine is sucking in as much air as possible. Trying to have something like a 14B maintain 22 psi while the engine is sucking in as much air as possible at 6000 rpm's is going to be significantly less efficent than something like a FP Green maintain that same amount of pressure while the engine is sucking it in at 6000 rpm's.

The closest analogy I can think of is trying to blow through a straw and trying to blow through an empty paper towel roll. Trying to blow through that paper towel roll and maintain any kind of pressure will leave you winded pretty quickly. That's your 14B at 22 psi. Trying to maintain that same amount of pressure through the straw is not as difficult and won't leave you so winded. That's your FP Green at 22 psi.

It's the closest analogy I can think of when you think of turbocharger efficency.

 

[BoneMaro]

The 14b is near or out of it's fficiency range while the 16g still has quite a bit more room to grow!!

The 14B is nowhere near it's efficiency range at 22psi!! At 20-22 psi, it's like trying to tow a boat in a tricycle.

Efficiency range for the 14b is about 16-17 psi.

 

[ChvyKc]

I made the most amount of power at 19 pounds on my 14B on the stock intercooler. You could tell that anything above that and the stock turbo/intercooler wasn't able to keep up. This was with 550's, AFC II, Automotive FPR and a 255HP. I never got a chance to see that the 14B would do on a bigger intercooler, I decided to take a crap on me before I could do anything.

 

[boostdog]

Hmmmm...i never thought about it that way. i was using my knowledge of irrigation systems. when i made that remark where pressure always stays the same through the entire systems. i know i know this is a car not an irrigation systems but o well i was wrong.

 

[hereitcomes]

Different turbos can flow more different air volumes depending on which turbo. Running 15 lbs on a 14b is different than running 15 lbs on a 50 trim garrett.

 

[SkyLineGtR-R34]

Different turbos can flow more different air volumes depending on which turbo. Running 15 lbs on a 14b is different than running 15 lbs on a 50 trim garrett.

Yeah, what he said.
But still 14b is a nice lil' turbo that can work for ya untill you get something bigger and put some supporting mods.

 

[SkyLineGtR-R34]

i have a t-25 and am running 19 psi w/ no fuel mods, just a boost controller. I dont know about a 14b ya see

I think after 16 psi it's pretty much pointless running more boost. Just hot air blowing... (on a t-25, that is)