Garrett GT25-DBB

[omnivore]

I am looking at buying one of these. It is suposed to support 350 WHP. I am gunning for a 300 FWHP Omni that can run a 12 flat on slicks, and still be autocrossed and street driven without much spool time (I mean I want full boost around 20 psi by 3200 rpmish).

The GT turbo comes:
48 trim wheel, in a .60 AR comp housing, with a 76 trim turbine, in .82 AR housing..Flow is rated at 39 lbs.

Will this turbo be well suited to a 2.2, G head, 89 roller cam, 5 spd, 2.5 madrel exhaust, no cat, 3 BAR, + 40% cal....and a water to air intercooler (bar and plate core).

[TurboBuggy]

I think it may be a bit too small

the 60trim version is a bit better and would do "ok" at 20 pounds boost, but its still a little on the small side if you were to go over 20psi boost


The GT2871R 48trim .60a/r would do better at around 20psi but there isnt much breathing room above that

[omnivore]

Anyone have a comp map of this unit?

[TurboBuggy]

[TurboBuggy]

[omnivore]

Is that 1st map for the turbo I was looking at? Looks like about 250 HP is where it'd start to become inefficient. Rayhall Turbos claims that it is good to 350 HP. ...hmm

[TurboBuggy]

at the top of the map it says what it is, actually the first one is the 60trim so the 48trim would be even worse

[john1320]

According to Chris, you can go larger and still retain crazy quik spoolup.

[shadow t2]

I'm running the GT2871R with the 56 trim compressor, .63 exhaust. It's in my 89 mini with a fresh 2.5l, ported swirl port head (by myself) & the 88 TBI cam. So far I only have 16psi with a 5th injector & it's great. I had to modify a TU header for the flange & relocate the turbo closer to the firewall so the compressor hsg would clear the intake. The spool up on this turbo is amazing. Feels like a mitsu spool, pulls amazingly hard for 16psi. I really need a tune with the ported head & cam. I had to add the 5th injector to take 6me from 14psi to 16psi with +40's injectors. It pulls the heavy van with 2.70s gears in the a413 with no problem. Consider the fabrication required before purchasing one of these.



Coy

[shadow t2]

engine before installation

2871R vs.mitsu

Fab work on TU header

[krazy4]

Quote:

Originally Posted by shadow t2

[john1320]

I see you went to shop ATP's site
Been looking over there myself, as it's cheaper than TU for true BB.
Let us know what it does with a tune!
+40s and 5th are a bit heavy- what A/F are you averaging?

[shadow t2]

WOT @ 5900 rpm I have 11.0-11.5:1. I have the fuel pressure cranked down to 30 psi initial. I bought the turbo from Himni racing, cheaper than ATP. I'm gonna try a adjustable gain regulator to add fuel. Funny, you can hear the turbine spinning for 30 seconds or so after I kill the engine from an idle.

[Austrian Dodge]

i bought my gt30r directly from chris @ tu...
no need for customizing the header and stuff -> chrysler style turbine housing
it has internal wastegate and is kind of a bolt-on!

therefore i had absolutely no problem paying a few bucks more

[john1320]

True, true! We either have time or $$. I rarely have both..
Shadow, did you have a link to that vendor?
Sounds like a smooth turbo still winding down *tells the lady "size DOES matter"*

thanks