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View Full Version : gt25r vs gt2871r ?

drnovascotia
06-10-2005, 08:05 PM
For my sil80, built block SR, full downpipe exhaust FMIC and such. Greddy e-manage, ssautocrack mani, taka lines, etc.

Goal is for good 7-9psi daily, and wanna go 11's @ the track with 18psi.

Both now seem to be the same question now that the gt2871R price went up, so 2 questions.

Both are identical in the sense they use same mani, same downpipe, same hotpipe, mild intake fab needed. . so no diff there. No major diff in price either. Both are BB centers. A lot of similarities.

1. which one will be better for quick spooling daily, but still kick @ the track ?

2. for mainly street driving which trim, .64 or .86 ? I know the .64 is more responsive, but off FA I saw the dyno of both side by side and it seems the turbo takes a few hundred more to spool up, but once it does is strong till 7K rpm's. if I did the .64 it says maxes @ 350, but reality is ~290-320rwhp. . . whereas the .86 says 400 and would be around 330-370.

LSD isn't in but is in the way, and clutch will be right behind it.

gonna do 650 or 740cc injectors and z32 mafs once I find them!

THANKS IN ADVANCE!

Dr.
TheSparo
06-10-2005, 10:40 PM
where do you get "in reality 290-320 hp? i've seen the turbo put 363whp(.64) on an SR... and 413rwhp(.86) on one as well
basically, newer technology, so go with 2871r, and gt25/40r does require you to trim the motor mount, while the 2871r just bolts in...
and if you don't mind lag, fo with .86
drnovascotia
06-11-2005, 04:54 AM
And i'm sure with some insane mods they get that high, but I don't think i'll ever that that amount of mods to be able to get that high, like intake mani, pulleys, cams, etc.

if it's 300-500 rpm's worth of diff I don't see a diff, but if it's mostly daily driving I should probably stick with the .64 then huh?

Dr.
Var
06-11-2005, 11:12 AM
And i'm sure with some insane mods they get that high, but I don't think i'll ever that that amount of mods to be able to get that high, like intake mani, pulleys, cams, etc.

if it's 300-500 rpm's worth of diff I don't see a diff, but if it's mostly daily driving I should probably stick with the .64 then huh?

Dr.


You need a headgasket, exhaust, and the right fuel supply and tuning. You can make 400hp with the .86 on a close to stock motor. Cams would help to.