t-25 in s14 ka, max. boost? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

nipplepinch666 · 08-08-2004, 09:38 AM

what is the maximium boost recommended on the stock injectors for a ka with a t-25 turbo. It seems to be doing well with the 7lbs that I am running now.

skatanic28 · 08-08-2004, 12:25 PM

that thing has gotta spool almost instantly.
from what ive been readin 6-7 psi maxes out the 270's on stock pressure, and the 370's are good to 10 or so. im not boosting yet but those are the numbers that i am going with so far.

240Stilo · 08-08-2004, 02:15 PM

I would say be happy with that and don't push your luck. Unless, you're just curious like me and want to put it to the test meanwhile you have a back up engine ready.

nipplepinch666 · 08-08-2004, 04:55 PM

I can hear it start to spool at 1750 rpm's and the bov will go off if i let off the throttle. Does anyone with a t-25 know if 9-10 lbs is safe? i'm running 7, and am running rich it seems. mabye it is my stock fuel curve which is making it run rich at low rpm's.

Mr. Spool · 08-08-2004, 06:24 PM

I was wondering the same thing on stock injectors with my ihi, every body says that the stock injectors max out at 5psi and the 370s at 7psi but they never say with what turbo, I have ran up to 9psi by accident and I was fine. let me know what you come up with.

orion::S14 · 08-08-2004, 07:03 PM

Stock 270cc injectors cannot do more than 200rwhp safely.

Whether that's 2psi or 15psi from your setup, that's the safe limit.

I'd bet your over that by a little bit with 7psi from a T25...you're just waiting for the day it blows due to a lean condition.

Same goes for you "Mr. Spool"...if it's an IHI T4 or bigger, you're pushing your luck.

Once the injectors go static, they can still supply fuel, but not enough for more than 200rwhp (at stock fuel pressure...).

- Brian

Ricer240sx · 08-08-2004, 08:27 PM

i will be running a T25 on my ka and i was told that the turbo is efficient up to 15 psi!!! i have 444cc injectors out of a RB26, will thoes support the 15 psi??? so should i ask what hp will they hold???? im hopeing to push 300 hp

orion::S14 · 08-08-2004, 08:41 PM

~14psi is the common "max" on an SR.

444cc injectors, stock fuel pressure, and a max of 95% duty cycle will theoretically get you to ~292rwhp safely, if you plug the numbers.

T25 + KA + 15psi will get you to ~270rwhp I'd bet, but probably over 300rwtq...based on "AceInHole"s dynos.

T25 are only good to about ~250rwhp on an SR...it'll get you a little more from the KA, but not much.

- Brian

Mr. Spool · 08-08-2004, 09:03 PM

The ihi I have is quite small, smaller than a t25 as far as I know, infact at 4psi there is little to no change over stock, but at 7psi it pulls hard, I keep it lower but due to a boost leak I was running 7 for a while.

*AceInHole* · 08-08-2004, 09:18 PM

Quote:

Originally Posted by orion::S14

~14psi is the common "max" on an SR.

444cc injectors, stock fuel pressure, and a max of 95% duty cycle will theoretically get you to ~292rwhp safely, if you plug the numbers.

T25 + KA + 15psi will get you to ~270rwhp I'd bet, but probably over 300rwtq...based on "AceInHole"s dynos.

T25 are only good to about ~250rwhp on an SR...it'll get you a little more from the KA, but not much.

- Brian

I hit 275rwhp and 310tq at 13psi. That's with dangerous ignition timing, though. A boost retard would bring it down quite a bit....

Finally drove my car again today after putting another engine in. I had forgotten how fast the T25 spools.... seemed more instant than my friend's supercharged honda.

orion::S14 · 08-08-2004, 10:21 PM

I couldn't recall...I was thinking 255rwhp.

I stand corrected.

Ricer240sx · 08-09-2004, 07:03 PM

i got walbro Fuel pum too

lol but i really really want 300hp!!!!!! lol i guess ill have to pick up a 14b or something

hehehehe maybe a T3 who knows

08-08-2004, 09:38 AM	#1
nipplepinch666 Join Date: Dec 2003 Location: sc Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	t-25 in s14 ka, max. boost? what is the maximium boost recommended on the stock injectors for a ka with a t-25 turbo. It seems to be doing well with the 7lbs that I am running now.

08-08-2004, 02:15 PM	#3
240Stilo Junkie Join Date: May 2002 Location: Socal Age: 41 Posts: 1,160 Trader Rating: (0) Feedback Score: 0 reviews	I would say be happy with that and don't push your luck. Unless, you're just curious like me and want to put it to the test meanwhile you have a back up engine ready. __________________ -Juan

08-08-2004, 06:24 PM	#5
Mr. Spool Zilvia Addict Join Date: Jan 2003 Location: East Side, Michigan Age: 44 Posts: 622 Trader Rating: (0) Feedback Score: 0 reviews	I was wondering the same thing on stock injectors with my ihi, every body says that the stock injectors max out at 5psi and the 370s at 7psi but they never say with what turbo, I have ran up to 9psi by accident and I was fine. let me know what you come up with. __________________ 96' SE Turbo'd Super 60, S-AFC, SMIC, 370cc Injectors, Open Air BOV, Warblo 255 pump, Stage 3 Clutch Kyb agx, Sportline Springs Full body kit, Bomex rear, Drift sides, r34 front gunmetal rims, yok tires

08-08-2004, 08:27 PM	#7
Ricer240sx Zilvia Addict Join Date: Sep 2002 Location: Green Bay WI Age: 40 Posts: 615 Trader Rating: (0) Feedback Score: 0 reviews	i will be running a T25 on my ka and i was told that the turbo is efficient up to 15 psi!!! i have 444cc injectors out of a RB26, will thoes support the 15 psi??? so should i ask what hp will they hold???? im hopeing to push 300 hp __________________ 00 impreza 2.5rs sedan...dd 00 impreza 2.5rs coupe....EJ255, goin rwd!!

08-08-2004, 09:03 PM	#9
Mr. Spool Zilvia Addict Join Date: Jan 2003 Location: East Side, Michigan Age: 44 Posts: 622 Trader Rating: (0) Feedback Score: 0 reviews	The ihi I have is quite small, smaller than a t25 as far as I know, infact at 4psi there is little to no change over stock, but at 7psi it pulls hard, I keep it lower but due to a boost leak I was running 7 for a while. __________________ 96' SE Turbo'd Super 60, S-AFC, SMIC, 370cc Injectors, Open Air BOV, Warblo 255 pump, Stage 3 Clutch Kyb agx, Sportline Springs Full body kit, Bomex rear, Drift sides, r34 front gunmetal rims, yok tires

08-08-2004, 12:25 PM	#2
skatanic28 Zilvia Junkie Join Date: Oct 2002 Location: ny Age: 41 Posts: 443 Trader Rating: (0) Feedback Score: 0 reviews	that thing has gotta spool almost instantly. from what ive been readin 6-7 psi maxes out the 270's on stock pressure, and the 370's are good to 10 or so. im not boosting yet but those are the numbers that i am going with so far.

08-08-2004, 04:55 PM	#4
nipplepinch666 Join Date: Dec 2003 Location: sc Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	I can hear it start to spool at 1750 rpm's and the bov will go off if i let off the throttle. Does anyone with a t-25 know if 9-10 lbs is safe? i'm running 7, and am running rich it seems. mabye it is my stock fuel curve which is making it run rich at low rpm's.

08-08-2004, 07:03 PM	#6
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,666 Trader Rating: (0) Feedback Score: 0 reviews	Stock 270cc injectors cannot do more than 200rwhp safely. Whether that's 2psi or 15psi from your setup, that's the safe limit. I'd bet your over that by a little bit with 7psi from a T25...you're just waiting for the day it blows due to a lean condition. Same goes for you "Mr. Spool"...if it's an IHI T4 or bigger, you're pushing your luck. Once the injectors go static, they can still supply fuel, but not enough for more than 200rwhp (at stock fuel pressure...). - Brian

08-08-2004, 08:41 PM	#8
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,666 Trader Rating: (0) Feedback Score: 0 reviews	~14psi is the common "max" on an SR. 444cc injectors, stock fuel pressure, and a max of 95% duty cycle will theoretically get you to ~292rwhp safely, if you plug the numbers. T25 + KA + 15psi will get you to ~270rwhp I'd bet, but probably over 300rwtq...based on "AceInHole"s dynos. T25 are only good to about ~250rwhp on an SR...it'll get you a little more from the KA, but not much. - Brian

08-08-2004, 10:21 PM	#11
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,666 Trader Rating: (0) Feedback Score: 0 reviews	I couldn't recall...I was thinking 255rwhp. I stand corrected.

08-09-2004, 07:03 PM	#12
Ricer240sx Zilvia Addict Join Date: Sep 2002 Location: Green Bay WI Age: 40 Posts: 615 Trader Rating: (0) Feedback Score: 0 reviews	i got walbro Fuel pum too lol but i really really want 300hp!!!!!! lol i guess ill have to pick up a 14b or something hehehehe maybe a T3 who knows __________________ 00 impreza 2.5rs sedan...dd 00 impreza 2.5rs coupe....EJ255, goin rwd!!