Noob quesiton: Greddy vs GT25
#1
Noob quesiton: Greddy vs GT25
More turbo newbie-ness for you all
Assuming you had two cars both pushing out a solid 180rwhp; one is running a Greddy setup, the other a GT2554.
I'm guessing the GT25 would spool sooner, but what would the difference in driveability be between the two cars?
Thanks
John
Assuming you had two cars both pushing out a solid 180rwhp; one is running a Greddy setup, the other a GT2554.
I'm guessing the GT25 would spool sooner, but what would the difference in driveability be between the two cars?
Thanks
John
#3
Because the T25 would spool sooner, you'd likely have quite a bit more torque in the 2000-3500 RPM range, making around-the-town driving more pleasant.
I don't think the turbo cartridge would "last much longer" than the Mitsubishi's, though. If taken care of properly, the difference should be near negligible.
I don't think the turbo cartridge would "last much longer" than the Mitsubishi's, though. If taken care of properly, the difference should be near negligible.
#4
I have driven both. The GT2554r in almost instant boost were as the Greddy kicks in around 3000rpm which isn't bad. Both feel comparable in the upper rpm range. You probably have to run a higher boost level with the Greddy to achieve 180 compared to the gt25r depending on your setup. I give the edge to the gt25r, but I own one
#6
To actually add something useful here is a merged dyno graph of a GT25R vs. a Greddy both at 8 psi. Both on dynojets. Both relatively not well tuned. Both with 2.5" exhausts. GReddy with stock 1.75" DP and GT25R with 2.5" DP. (Yes, I am making excuses) Not done on the same dyno, nor the same day, but good for a general comparison.
Look at that early spool! So jealous....
Almost forgot two more excuses...below dynos GT25R was on a 1.8L and GReddy on a 1.6 and who drives under 3K rpm in a miata anyway? :gay:
Look at that early spool! So jealous....
Almost forgot two more excuses...below dynos GT25R was on a 1.8L and GReddy on a 1.6 and who drives under 3K rpm in a miata anyway? :gay:
Last edited by brgracer; 06-21-2006 at 03:24 PM.
#8
We'll to make Greddy owners feel a bit better....the sleeve bearing turbo's are rebuildable (rebuild kits available), where as ball bearing are cheaper to replace than repair (alot more $). Also since your not in boost in the lower rpms, your saving some gas. I kind of like the dual personality of my Miata with the Greddy.
#10
Wow, great info, thanks!
That Dyno chart was interesting, a 2.5" DP on the greddy would help narrow the spoolup gap wouldn't it?
I see this isn't going to be an easy decision. Once I've decided on the GT25 the Greddy's low price tempts me...and when I've decided on the Greddy someone says they wished they had thrown a GT25 in to start with.
Hopefully getting a ride in a Greddy next week so I'm hoping that will help me decide.
Thanks!
That Dyno chart was interesting, a 2.5" DP on the greddy would help narrow the spoolup gap wouldn't it?
I see this isn't going to be an easy decision. Once I've decided on the GT25 the Greddy's low price tempts me...and when I've decided on the Greddy someone says they wished they had thrown a GT25 in to start with.
Hopefully getting a ride in a Greddy next week so I'm hoping that will help me decide.
Thanks!
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