Today me and a mate (with a subaru type RA) both booked our cars in for a RR diagnostic session at weston performance

http://www.westonperformance.com/

they said they've had a couple of 20vt in before, anybody off here had any dealings with these people?. from the website they look pretty proffessional, and claim to have one of, if not the most advanced rolling road in the country, and after speaking them they seem very friendly and helpfull so really looking forward to it

they are a bit pricey at £75 + vat, but i will get an hour on the road, including

BHP figures
Torque figures
Boost analysis
fueling check
knock test

so not to bad i dont think.

Anyway, what figures do you think i should expect? mods include..

GTEC 1
Walbro 255 + wiring mod
Armval switchable PRV (base / 1.0bar, with 1.2 overboost)
Peco cat back
K&N panel with mod air box
uprated DV
thats all at the mo

any ideas?

ninja

260bhp

Ninja I've visited this place just last month and they are indeed very professional. I agree you should get around 260bhp or thereabouts.

cheers guys, i will be happy with that, but i'm not finished tuning yet

glad to hear of a happy customer aswell, i will post my results when i get done.

ninja

What date are you going? I was meaning to go back but haven't had the chance to.

hi ive heard of them as its my mates company , and yeah they have spent alot of money getting right dynos etc

greg is my mates name he main guy apart from owner, i grew up with him before he went to swansea uni to do motorsport course ,hes been sweden to work with rally teams etc

Yeah he's the dyno operator and nearly everytime I've visited, he's just come back from Sweden sometimes with their drift car.

yeah he got drift car with driver which they enter in drift comps , but he got his own one too . he was back in bristol month ago drifting and crashing it about lol

I reckon at 1.0 bar with 1.2 overboost you'll run about 230-240. If you can hold 1.2 bar in the midrange then 250-260.

i'm booked in on the 7th july,

WOW is there really that much differance in .2 bar?

ninja

Yes - on your setup you'll get 10-15 bhp per 0.1 bar of boost increase, over 1.2 bar and you'll get diminishing returns, and at 1.4 you may well find you get less than at 1.2 as the turbo is not efficient at this level (would also give fuelling issues + high charge temps etc.)

1.0 bar is standard boost - the power hike from a chip comes mainly from the boost hike, though some play with the ignition advance as well.

wow i better start tweakin

but with a 1.2bar max limit i feel safe at 1bar, until i source a gt28rs in the future

ninja

well very impressed in a whole, very friendly, helpful advice (straight to the point, not trying to sell me everything on the shelf) very clean workshop, and some very good equipment! (lots of very highly moddified cars on the car park, mainly jap, evos, supras, silvias)

as for the results, suba you were right - Max 241.4bhp @ 1.0bar! which i'm happy with for the level of tuning.

http://i5.photobucket.com/albums/y165/bravo_rich/rr_results_2small.jpg

as the graph shows, i have a boost spike when the boost comes in, causing it to run a little lean, but this settles quickly. This is due to the manual PRV and can be easily rectified with an EBC. i am also running a little rich at the top end, EBC should sort this by holding the boost a little better further up the rev range (Next mod me thinks )

all in all a vary good day, except for my mates subaru, which he found out his exhaust was FUBAR and he needed new spark plugs, but he still pulled 271bhp (should be 300+ when he gets a full de-cat sorted)

would recommended them to any one

heres a few pics

Rolling road

http://i5.photobucket.com/albums/y165/bravo_rich/RR1small.jpg

http://i5.photobucket.com/albums/y165/bravo_rich/RR2small.jpg

owners 650bhp supra

http://i5.photobucket.com/albums/y165/bravo_rich/RR3small.jpg

westons drift car (and customers cozzie in the back)

http://i5.photobucket.com/albums/y165/bravo_rich/RR4small.jpg


rich

Well - slightly over my prediction but not by much.