Sluggish 98GU 2.8 Turbo Intercooled

Hi Team,
Well what a difference fuel makes, after running it in for a few thousand Kms we managed to find a cheap tune box (single screw type) and proceeded to wire it in. Followed the instructions and set it up so we were actually getting a little puff of diesel soot out of the exhaust when stick the boot in. WOW!! it goes real good for a 2.8 let me tell you, the tip off was a chap at MTQ in Dandenong who said "if it aint puffing black theres not enough fuel going in" and he was right on the money. We are still going to get them to Dyno it because pump timing and all sorts of things could be out and they check and adjust everything, he also mentioned the tune box is a good way to see if your pump can pump enough or if its shagged!! Highly reccomend MTQ in Dandenong, great service, great prices on injectors and turbos, well worth the phone call.
Thanks to everyone for the great advice.

Hello and thank you to everyone who commented on my post. You were all right! after much prompting and blowing the bum out of his old Garrett Turbo the young fella decided to get the thing Dyno Tuned. The freshly rebuilt 2.8 coupled up to the new Garrett Turbo (many thanks to Gavin at Rotomaster in Campbellfield) new 3" stainless system, tune box and 18 psi actuator is quite impressive compared to the stock figures produced by Nissan.
Nissan claimed 98kw at the flywheel and 235 Nm of torque, we are now churning out 96kw at the rear wheels with 33" tyres and the best thing!! 409 Nm of torque.
Wow!! the old girl realy gets up and goes, for anyone who says the 2.8 is not worth the effort they should take a ride in this thing. Considering this was all done at home apart from the Dyno work we are quite pleased with the performance gains as well as the increased fuel economy.
My weekends will now be mine again

Sounds like you're more than happy, figures aren't too shabby either, well done.
Now to get it dirty . Now the forum has a bench mark for the 2.8s 0f 96RwKW.
Surely a bit more work and you can get to 100 rwKW ??? come on.
I take it you have boost and EGT gauges fitted?