14b Vs T25 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Powashiftin · 04-21-2004, 08:32 PM

After seeing Ace's setup im set on getting an SR T25 for my KA project.

The only thing setting me back is that a DSM buddy of mine has an extra 14B with NO SHAFT PLAY AT ALL for $100. T25's go for around that same price.

What should I Do? Rock the 14B, or hold out for a decent T25? I mean these turbos arent huge, but I drove my friend 1G Talon with about 14PSI and i liked it, it was VERY streetable, FAST spool up, pulled hard all the way to redline (he has downpipe, exhuast).

Thanks brodies

Ian · 04-21-2004, 10:10 PM

i dont understand how these guys make so much power on the stock t25??? i mean, the turbo can only flow so much air right? i mean, given all the exhaust mods the SR can only make an optimistic 240 at like 14 psi...isnt ace claiming 260?

DuffMan · 04-21-2004, 10:53 PM

Turbos max out when the turbine cant spin faster even when the engine is at its power peak and the wastegate is open. This happens because the efficency of both the compressor and turbine at these pressure and flow levels is too low create any acceleration in the wheels.

A turbo can flow more air at a given blade speed if it is making less boost. Since the KA has more displacement and higher compression, it can make more power at less boost, hense flowing more air, and making more power at the same rpm of turbo rotation than a SR.

A 14B is better than a t25. You would have to get a DSM flange, but dsm turbo options are at least as good, if not better than T2x options.

Powashiftin · 04-22-2004, 11:09 AM

I think the SR T25s flow more than the DSM T25s, is that right?

So a 14B would be a better choice? I would like to get an equal length tubular manifold for my KA ... idk what to do

Powashiftin · 04-22-2004, 11:15 AM

Quote:

Originally Posted by mainevent212

i dont understand how these guys make so much power on the stock t25??? i mean, the turbo can only flow so much air right? i mean, given all the exhaust mods the SR can only make an optimistic 240 at like 14 psi...isnt ace claiming 260?

Ace just posted up his Dyno sheet, about 275WHP and 311WTQ

Crazy shit right? i think a lot has to do with that equal length manifold. I bet if he were using a log style his numbers would be down to like 255whp and 290wtq

*sykikchimp* · 04-22-2004, 03:15 PM

and that additional .4 liters of displacement, and slightly higher compression ratio.

Ian · 04-22-2004, 06:35 PM

ah. i see...makes sense now...

Powashiftin · 04-22-2004, 10:20 PM

so the concensus is that that 14B and the SR T25 flow around the same?

Powashiftin · 04-22-2004, 11:34 PM

alright..

Thanks to Asad from the freshalloy forums..

"The info floating around is that the SR T25 has a 1.68"/2.12" minor/major diam. turbine wheel (or nearly maybe a 1.64"/2.09"). The DSM VFAQ says the DSM T25 has a 1.59"/1.83" wheel. It also says that the TD05H-14B uses a 1.93"/2.20" turbine."

I'm getting the 14B tomorrow and a 1G DSM BOV. muwahaha...

04-21-2004, 08:32 PM	#1
Powashiftin Zilvia Junkie Join Date: Dec 2002 Location: Northern NJ Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	14b Vs T25 After seeing Ace's setup im set on getting an SR T25 for my KA project. The only thing setting me back is that a DSM buddy of mine has an extra 14B with NO SHAFT PLAY AT ALL for $100. T25's go for around that same price. What should I Do? Rock the 14B, or hold out for a decent T25? I mean these turbos arent huge, but I drove my friend 1G Talon with about 14PSI and i liked it, it was VERY streetable, FAST spool up, pulled hard all the way to redline (he has downpipe, exhuast). Thanks brodies __________________ http://www.tempusband.com

04-22-2004, 11:09 AM	#4
Powashiftin Zilvia Junkie Join Date: Dec 2002 Location: Northern NJ Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	I think the SR T25s flow more than the DSM T25s, is that right? So a 14B would be a better choice? I would like to get an equal length tubular manifold for my KA ... idk what to do __________________ http://www.tempusband.com

04-22-2004, 03:15 PM	#6
sykikchimp WOW addicted Join Date: Dec 2001 Location: the moon Age: 40 Posts: 6,518 Trader Rating: (0) Feedback Score: 0 reviews	and that additional .4 liters of displacement, and slightly higher compression ratio. __________________

04-22-2004, 10:20 PM	#8
Powashiftin Zilvia Junkie Join Date: Dec 2002 Location: Northern NJ Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	so the concensus is that that 14B and the SR T25 flow around the same? __________________ http://www.tempusband.com

04-22-2004, 11:34 PM	#9
Powashiftin Zilvia Junkie Join Date: Dec 2002 Location: Northern NJ Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	alright.. Thanks to Asad from the freshalloy forums.. "The info floating around is that the SR T25 has a 1.68"/2.12" minor/major diam. turbine wheel (or nearly maybe a 1.64"/2.09"). The DSM VFAQ says the DSM T25 has a 1.59"/1.83" wheel. It also says that the TD05H-14B uses a 1.93"/2.20" turbine." I'm getting the 14B tomorrow and a 1G DSM BOV. muwahaha... __________________ http://www.tempusband.com

04-21-2004, 10:10 PM	#2
Ian Post Whore! Join Date: Apr 2003 Location: i'm gonna get INSIDE your face Age: 34 Posts: 3,658 Trader Rating: (0) Feedback Score: 0 reviews	i dont understand how these guys make so much power on the stock t25??? i mean, the turbo can only flow so much air right? i mean, given all the exhaust mods the SR can only make an optimistic 240 at like 14 psi...isnt ace claiming 260?

04-21-2004, 10:53 PM	#3
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	Turbos max out when the turbine cant spin faster even when the engine is at its power peak and the wastegate is open. This happens because the efficency of both the compressor and turbine at these pressure and flow levels is too low create any acceleration in the wheels. A turbo can flow more air at a given blade speed if it is making less boost. Since the KA has more displacement and higher compression, it can make more power at less boost, hense flowing more air, and making more power at the same rpm of turbo rotation than a SR. A 14B is better than a t25. You would have to get a DSM flange, but dsm turbo options are at least as good, if not better than T2x options.

04-22-2004, 06:35 PM	#7
Ian Post Whore! Join Date: Apr 2003 Location: i'm gonna get INSIDE your face Age: 34 Posts: 3,658 Trader Rating: (0) Feedback Score: 0 reviews	ah. i see...makes sense now...

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