Official T25 compressor flow map thread
10-30-2005, 03:34 PM
#12
0.0 BAR
Join Date: Oct 2005
Posts: 7
Re: Official T25 compressor flow map thread
I found this thread while Googling for a T25 compressor map. So, I registered just so that I could post a reply. I have a DSM 2G T25 on my 2003 Kawasaki ZRX1200. The engine is 1164cc & this turbo works extremely well on my bike. I am running about 8.3-1 compression ratio with stock internals. I start to get boost at slightly over 3000 RPM & have full boost by 5000 RPM. I could probably get better response if I was using a 4-1 exhaust header instead of a log type manifold, but I wanted a "high mount" system so that my oil drain line would be positively downhill. I have the MBC set at a conservative 11 psi, but I do crank the engine to 10000 RPM. At this pressure level I don't get any noticeable boost creep. The bike is extremely fun to ride, especially with an extended swingarm to tame the wheelies. I have had zero problems with the T25(unless you count the melted piston from tuning leaness). I can't vouch for the performance of the T25 on 2G DSMs, but I CAN tell you that it rocks for my installation.
Larry
Larry
10-30-2005, 11:58 PM
#13
0.0 BAR
Join Date: Jun 2003
Posts: 0
Re: Official T25 compressor flow map thread
Originally Posted by larryc7777
I found this thread while Googling for a T25 compressor map. So, I registered just so that I could post a reply. I have a DSM 2G T25 on my 2003 Kawasaki ZRX1200.
post pics...
W
11-02-2005, 08:39 AM
#17
0.0 BAR
Join Date: Oct 2005
Posts: 7
Re: Official T25 compressor flow map thread
Thanks guys. 
I'll start a new thread when I get back home. I have A LOT of pics of the whole installation process. I'm finally getting the jetting sorted out thanks to the DJ Wideband Commander but now the riding season is ending here in the Midwest. 
I'll start a new thread when I get back home. I have A LOT of pics of the whole installation process. I'm finally getting the jetting sorted out thanks to the DJ Wideband Commander but now the riding season is ending here in the Midwest.
01-16-2006, 03:54 PM
#18
1.0 BAR
Join Date: May 2005
Posts: 378
Re: Official T25 compressor flow map thread
Here is the correct map for the largest of the T25's the 60 TRIM with a 0.80 A/R compressor housing and a 0.68 A/R exhaust housing:
The max pressure ratio that you should even consider would be 2.1 Pr or roughly 14~15 psi which would put you at roughly 154K short of the maximum permissable speed line 167K. Running 15 psi would put you around 20 lbs/min, 8.531 m³/min, or roughly 301 CFM with a 70% efficiency. Basic rule of thumb is 150CFM per 100 hp and 200 hp is entirely possible with this turbo given good tuning and an even better intercooler.
This turbo is happiest at a 1.7 Pr (10 psi) which would be roughly 15 lbs/min, 6.398 m³/min or roughly 225 CFM. It's a great turbo for a street driven HMT project or someone who is just starting out. it will obviously work better with a smaller displacement motor but can be used up to a 3.0 V6. The old Grand Ams used them as well.
The bottom line is that this turbo a good starter turbo but if you plan on having a dyno queen or overzealously raising the boost, this turbo isn't for you. Run it anywhere from 10~15 psi with a good intercooler and you're still going to have a fun car to drive that kicks the ---- out of your friend with a T3/TO4E 60 trim who can't get out of the 14's without massive wheelspin, snapping rods, melting pistons.
The answer isn't always throwing on the biggest turbo you can find just because someone else is doing it.
Hope this helps.
The max pressure ratio that you should even consider would be 2.1 Pr or roughly 14~15 psi which would put you at roughly 154K short of the maximum permissable speed line 167K. Running 15 psi would put you around 20 lbs/min, 8.531 m³/min, or roughly 301 CFM with a 70% efficiency. Basic rule of thumb is 150CFM per 100 hp and 200 hp is entirely possible with this turbo given good tuning and an even better intercooler.
This turbo is happiest at a 1.7 Pr (10 psi) which would be roughly 15 lbs/min, 6.398 m³/min or roughly 225 CFM. It's a great turbo for a street driven HMT project or someone who is just starting out. it will obviously work better with a smaller displacement motor but can be used up to a 3.0 V6. The old Grand Ams used them as well.
The bottom line is that this turbo a good starter turbo but if you plan on having a dyno queen or overzealously raising the boost, this turbo isn't for you. Run it anywhere from 10~15 psi with a good intercooler and you're still going to have a fun car to drive that kicks the ---- out of your friend with a T3/TO4E 60 trim who can't get out of the 14's without massive wheelspin, snapping rods, melting pistons.
The answer isn't always throwing on the biggest turbo you can find just because someone else is doing it.
Hope this helps.
01-17-2006, 01:28 PM
#20
0.0 BAR
Join Date: May 2005
Posts: 0
Re: Official T25 compressor flow map thread
I agree that the T25 is way too small for a 2.0L motor, but look at almost every single OEM turbo setup. They aren't out for top end power. They choose turbos were the efficiency lands at the lower RPMS. Zero top end. That way when somebody buys it and they floor it at 2000 RPMs, they will say WOW! GEE! my cars feels so fast, but in reality the top end is falling right of the map, and thus they're car has no power were it is needed and the car is slow(er).
Look at the new Mazdaspeed 6. That thing has a 2.3L motor, crazy torque at lower RPMs, but falls on it's face after 5000. So the T25 is a decent turbo, but just make sure it's for the right motor. Otherwise it might "feel" fast, but isn't.
Look at the new Mazdaspeed 6. That thing has a 2.3L motor, crazy torque at lower RPMs, but falls on it's face after 5000. So the T25 is a decent turbo, but just make sure it's for the right motor. Otherwise it might "feel" fast, but isn't.
