STi Time Attack 2008 - new dyno figures !!

rolty · Post by **rolty** » Sun Nov 18, 2007 7:46 pm

Does seem a little odd in that case if there are no significant gains to be had using the 3 port. Makes sense though really as the WR1 isn't exactly a country mile away from a normal UK STi

Gerry H · Post by **Gerry H** » Sun Nov 18, 2007 11:37 pm

Subaru went from a 2 port to a 3 port solenoid about MY99 iirc. What's the difference between the Prodrive unit and OE, other than price?

duncan · Post by **duncan** » Mon Nov 19, 2007 8:10 am

They went back to a 2 port the year after iirc Gerry.

The standard unit is a 2 port where the compressor and wastegate pipes are T'ed together with a restrictor pill in the pipe to the wastegate. With the 2 port the wastegate always sees some pressure and depending on the strength of the wastegate arm it may never be 100% open.

The 3 port bypasses the wastegate until pressure is needed to open it.

duncan · Post by **duncan** » Tue Nov 20, 2007 5:30 pm

okay - I may have been hasty in my 'dissing' this modification.

It does seem to hold marginally more boost higher up the rev range and spool a fraction of a fraction quicker. Not a lot in it yet but more changes to the maps and there may be a benefit after all with this turbo.

With a turbo change it will definitely have a benefit.

blacky · Post by **blacky** » Tue Nov 20, 2007 5:44 pm

You sure its not just because this part is new, and you old one had done x miles??

duncan · Post by **duncan** » Tue Nov 20, 2007 5:45 pm

good point - long and short of it is that I am not sure at all :whistle:

323ian · Post by **323ian** » Tue Nov 20, 2007 5:54 pm

Nice to keep up to date on this project mate, you really seem to have got stuck into the mapping now, fair play on that.
Keep up the good work, it was an awesome car when i had a pax ride!

Down side is it kept my rear view mirror filled when i floored the Skyline on the road and i have an extra 600cc!

duncan · Post by **duncan** » Tue Nov 20, 2007 6:17 pm

100cc Ian - mine is a 2.5 litre

323ian · Post by **323ian** » Tue Nov 20, 2007 7:05 pm

Oh yeah, ha ha at least i feel better now! Think of all the weight i have extra to you now!! Slow Scooby's!!

duncan · Post by **duncan** » Tue Nov 20, 2007 7:48 pm

what weight is yours Ian ?

Book weight for the 06 subaru is 1495 KG