xDennis
10-07-2002, 03:05 PM
Please, don't flame me for asking these questions but i can't really get answers from the search function.
What Are the Difference between the two turbos.
From what i understand:
The t28 has a larger exhasut housing making spooling time slower, and will be able to handle 270WHP, where is the T25 has a a smaller housing. Even though both Turbos are the same size, correct? And the t25 will handle a max of 250whp. Am i correct about all this?:confused:
djisnx2000
10-07-2002, 04:33 PM
Yes, the T28 is a T25 with a T03 compressor.
sonnypippo
10-08-2002, 04:08 PM
another question: at what boost levels will the t25 and t28 make their respective "maximum" power?
javierb14
10-10-2002, 02:23 PM
t25's also come with t3 comp wheels....mine is a 60trim that flow 31lbs/min. good for ~300hp
djisnx2000
10-10-2002, 02:30 PM
I think he was talking about a stock T25. But yes the t25 can also be matched with a T3 compressor.
Sirnixalot
10-10-2002, 02:35 PM
a T-25 with a T3 or TO4 compressor wheel/housing is a T-28
Victorious
10-10-2002, 05:20 PM
hey sonnypippo,
I'm no expert, ,but I'd say that they both probably reach full boost by 3k rpm's.
CowboyDren
10-10-2002, 07:08 PM
Originally posted by djisnx2000
Yes, the T28 is a T25 with a T03 compressor.
No, quite incorrect.
Nissan, HKS, Garrett, Turbonetics turbo sizing (FAQ) (http://www.se-r-list.org/archives/2001/2001-04/msg00883.html)
(Hope that link works). Neither are spool dogs, both are making usable boost by 3000 RPM, and both are very good turbos for street-driven cars. T25s tend to wheeze when you crank up the boost much (12-14 PSI), whereas a T28 can last a bit longer before reversion is a serious issue. This is mostly due to the different turbine capacities, I think, which is only partly because the turbine housing is larger on a T28.
sonnypippo
10-10-2002, 10:16 PM
thanks. would max boost/power be influenced by the type of manifold used? the t28 (gti-r) manifold flows better than the t25 right?
p.s. cowboy, the link didn't work for me.
CowboyDren
10-10-2002, 11:06 PM
The answer is yes. A GTi-R manifold promotes better spoolup, but I don't know by how much. Grinding off the casting flash and a couple of nubbins inside the manifold plus Extrude Honing makes either manifold better, but moreso for the 'R. If there's any chance that you might outgrow a T25, the 'R manifold is just an all-around better investment from the start, anyway.
The link didn't work because se-r-list.org is set up in a paranoid way. Go to same, and search the archives for a message by that title.