Turbo Replacement/upgrade - Your Thoughts?

[Raysboostin]

hi all

im just wondering if anyone has tried using a gt2876R on thier RB25 Neo?? a mate of mine has a GT3071 on his stag and its a bit laggy for my liking. this is just the next size down. any info or thoughts?? turbo specs follow the link.

http://www.turbobygarrett.com/turbobygarre...6R_705330_1.htm

[wolverine]

a GT2876 is really not a good combo. you have a 500hp compressor bolted to a relatively tiny turbine (something in the order of a 53mm). the garrett version usually isn't a T3 footprint. this turbo will absolutely be choked by the relatively tiny turbine.

A GT3071 with a proper 60mm turbine shouldn't be laggy at all with good tuning and should put out around 450hp (flywheel) depending on the compressor trim.

If this is a bitza turbo in a nissan housing then it is harder to guess at the results.

A GCG hi-flow more or less uses a 450hp compressor wheel but a smaller turbine wheel and these obviously work quite well as a cheap bolt on (bear in mind the turbine can choke this and its actual output might be a bit lower)

A HKS GT-RS is a GT2871 with a HKS T3 turbine housing. 53mm turbine, 71mm compressor (52 trim)

A HKS 2835ProS 56mm turbine, 71mm compressor (56 trim).

What are you aiming for with your car and what engine management do you have?

[Raysboostin]

im lookin for good streetable power. prob 250awkw is max. doesnt need to break records just have a nice spread across the rev range. just not to laggy. my mates one is prob laggy cos of the stock manifold. but usually autos spool quicker than manuals, so i took a guess it would be laggier on mine. i did some calcs and the 2876 will spool up nice, but i was worried it would be a bit restricted at the top.

as for management it will be full programable (haltech,microtech,wolf,etc) just havent settled on a brand.

have u got a compressor and turbine map for the gcg or hks turbos so i can do some basic calcs??

[wolverine]

the GT2876 really is pig.

if you want 250rwkw then the GCG Hi-Flow, GT3071 (with a 0.82 garrett housing), or HKS GT-RS put you right into the zone as they are all around the 420-450hp compressor mark.

The GCG unit is the easiest option as it bolts directly back onto the stock gear, the HKS GT-RS comes in kit form and bolts back into the stock location.

Any other option will require a new dump, lines and probably intake mods.

Once you have decent engine management PowerFC, ViPEC or other you will be able to spool any of these turbos with no issue.

If you are happy with a bush bearing then Hypergear is making some cheap bolt ons too.

[Raysboostin]

thanks for the help there wolverine.