Was thinking about a GT28RS. What are they like compared to a T28r what are the spool characteristics? When will it start coming on boost?? When will it come on to full boost?? I was aiming for around 320hp will this be achievable at 1.3-1.4 bar??
Cheers
Stage3 with t28r will give you 320 ish bhp... T28rs Way more laggy on an s13.. But when on boost.. Amazing...
How much more laggy as a t28r is only slightly laggier than a t25 so I've heard.
Cheers
gt28r is less laggier than t25, ball bearing ownz!
my old setup
GT28RS is outdated.
GT2871R gives better results in all ways.
And i guess the GTX28 series soon to be released (if not already) will please a lot of people ... cant wait to have the budget to get one. GT2554R spool with GT2871R powerband anyone ?
the GTX series will be more laggy, its acctually a larger turbo but as its not as laggy as the one its matchec to size wise they have called it the smaller turbo, they sit between the two,
ive had a gtx35 (or what now compares to one but it was an early one from scooby clinic) and it was a laggy mo fo to say the least, savage when it came on boost though
Can someone explain the graph to me please. Also why has one of the lines got oscillations in?? From the looks Of it looks like it tails off towards the top end?? Also was that a gt28rs or a t28r??Originally Posted by Sideways Danny
my old setup
Cheers
The lines with wobbles is the boost pressure.
The graph shows full boost is achieved at around 4750rpm peaking at 1.2bar and dropping slightly to 1.1 bar by redline.
What's the other line then??
Does anyone have any graphs for a t28r?? As full boost by nearly 5k is way to late.
Cheers
hp
Does anyone have dyno prints of a t28r and a gt2871r so I can compare??
Cheers
Have you looked in here ?
http://www.sxoc.com/vbb/showthread.php?t=142254
The search button is your friend.
That one did used to be stickied
Was always a good place to go to check how other people with a similar setup have performed.
I would also say the 2871r will be less laggy compared with 28RS.
I've had both 28R and now have a 2871R. I would choose the 2871r all day long.
My car is was used daily, and even at .9bar for daily use i didn't find one bit laggy tbh.
It was mapped to 1.4 bar, starting spooling at 2800rpm and hit full boost at 3400rpm.
Don't have any graphs, it was mapped using pfc and info was got from datalogic software.
How about a gt2876r?? From looking at the specs with the smaller trim it will spool faster than a 2871??
Cheers
my CA with a 2876 was at full boost at 4k-4100rpm, that was with a 2mm headgasket, no headwork. as per my sig, had good torque but relatively lower power at 1.3bar (I got the turbo off bren from his old S13 - he'd run at 1.4bar with cams and got to 400+). I didn't get a chance to go further with it as my 180 came along and my CA was pretty buggered from a dirty build.
the torque fell off fairly quickly towards the redline, I suspect the car could have done with some work on the inlet manifold & head to smooth the transitions at the very least. I liked the way the 2876 responded but I wouldn't use a thicker HG again, caused it to be very flat off boost.
white '94 s13 200sx scrapped - mapped to 1.45bar. OS giken box, garrett GT2876R, 950cc injectors, ORC twin plate, nistune. 349bhp/325lbft @ 1.3bar CA18DET
white '96 s13 180sx - type g with more kouki bits- RB25DET, GTR steel twin turbo conversion, RB26 crank & rods. 2.6L VVT twin turbo, SR20 OSG box, OSG STR twin plate clutch, Z32 ECU w/ nistune.
current status: 180 a bit broken but to be repaired.
Quoted for the truth....
t2871r £500 ish .. t2560r(t28r) £150+.. t28r will spool faster on a ca, but without doubt, the t2871r will pull better when on boost and is capable of 360ish bhp.. But if your only after 320bhp, i'd go the t28r route..
where do you shop? i would buy 2 at that price as last time i looked they were just shy of a grand with an actuator and an inlet flange.
you will be really pushing a t28r at anything over 300bhp they top out at 320. t28rs is old hat as has been stated you would be better off with a 2871r and running it safe as it would be good for 350bhp but at those figures you would want to be thinking about pistons and rods etc..
i had a t28r on my old one and you noticed the boost dropping off towards the top of the rev range. but i had head work on mine so its not really a good example. from memory you were on good boost by 2800rpm
to be honest turbo dynamics did me a t2860rs for just over £550 delivered but that was trade price and company i worked for at the time had to pay vat on it and that was with actuator but no inlet flange
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