much effort I finally picked my car up from Westfeild Motors late last night. On the install front i'm less than happy with the quality of the work carried out and even less impressed with the final cost! But that's a story for another time 
The results from this morning tuning session at Thor were a little dissapointing to say the least.
I was always led to believe that a bigger turbo should in theory be able to produce more power at the same boost levels than the smaller one it replaced 
In my own case this wasn't to be true!With the GT28 in place and running the same 1.2bar that was being run on the old turbo, I made virtually no gains! How the hell can that be I thought!?
In the end they mapped the car at a slightly higher 1.3bar which they deemed safe due to the fact that the GT28 would be passing cooler air etc. In the old spec the car made 286.7bhp @ the wheels. With the addition of the GT28 and larger injectors it made a gain of 18.8bhp, leaving me with 305.5bhp @ the wheels. But even this can not be attributed to the new turbo when you think about it. ie the fact that i had increased the boost by .1 of a bar and that their is now a 3" downpipe in place of the original decated elbow could more than be hels accountable for the new found power!? 
Once the tuning session was over Pete overlayed my mapping session over that of Neil Johnson graphs.
As most of you will know Neil is also using the GT28 and the very same C/C as myself. It was amazing just how closely our maps followed each other! 
Pete at Thor seemed to think that the only real reason for both my own and Neils troubles were caused by the Pace/Roque Systems C/C being unable to flow the amount of air our GT28's are throwing at them! 
So it would seem after all that Jonno's suspicions have been confirmed!? Anyone got an ST205 C/C they would like to sell
??? 
Mikejc
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