RaceDynamix STi - Time Attack 2009

RobCallow · Post by **RobCallow** » Tue Oct 06, 2009 7:01 pm

Any more pics of the diffuser Dunk?

Looking very

duncan · Post by **duncan** » Tue Oct 06, 2009 7:03 pm

Before the strakes went on:

after:

Bart · Post by **Bart** » Tue Oct 06, 2009 7:09 pm

alot work gone into the car, i like the rear diffusor nice job
so you planning on doing time attack for few more years then in club class?
so next year supose the target will be to retain the title then.

duncan · Post by **duncan** » Tue Oct 06, 2009 7:13 pm

I have to say I dont fully know what will happen - there are a few exciting options open to me - watch this space

Bart · Post by **Bart** » Tue Oct 06, 2009 7:21 pm

will do indeed

duncan · Post by **duncan** » Thu Oct 08, 2009 7:04 am

Couple of hiccups in the plan yesterday that cost a lot of time but now with the correct sized pulley I headed back to Zen to try it for size.

It fitted !

Final full assembly took place then along with remaking the feed hose from the oil tank to allow for the height difference between the block and the oil level in the tank and we were good to crank it to see oil pressure (we hoped).

Pump primed and away it went - perfect pressure just from cranking with rubbish oil. We were very happy

A quick stop for an excellent chicken curry and JP cooked by Liz and it was start it up good and proper. Woop woop it fired into life with 100 psi straight off rising to 125psi on revs.

Lots of checks on unions and connections along with pressure as the temperature rose and all good. Then the top of the radiator split on the top hose connection (i blame the monkey that put the jubilee on ... me) and it was time to take that out and put in a different rad that Paul had around. (thanks Paul)

Everything now fully assembled and road test time ... There was a lot of setting up of the correct oil pressure level with the adjustable pressure relief valve to get the right level through the rev range. A quick oil change to put some proper oil in and it was ready to try again.

Perfect !

Everything packed up and I headed back from Zen followed by Ren (who had been busy freezing Paul's bits along with doing some wiring .. ) at just gone midnight.

I am almost ready for Sunday now - just need some sleep and that should do it

RobCallow · Post by **RobCallow** » Thu Oct 08, 2009 12:42 pm

Great work Dunk I look forward to seeing the car in full TA spec.

Not seen either you or the car in ages.

Mr Fletcher · Post by **Mr Fletcher** » Thu Oct 08, 2009 7:32 pm

was there any specific criteria on the positioning of the diffuser ie angle , width, length etc .

In case we don't get to catch up with you on sunday Duncan we would like to wish you the best of luck in your quest for victory . After all the blood sweat and tears which have gone into this project it would be a fantastic conclusion to the season .

cheers

jason

Daniel · Post by **Daniel** » Thu Oct 08, 2009 7:35 pm

hardcore duncan, bloody hardcore mate

duncan · Post by **duncan** » Thu Oct 08, 2009 8:35 pm

sidewaysfletch wrote:was there any specific criteria on the positioning of the diffuser ie angle , width, length etc .

In case we don't get to catch up with you on sunday Duncan we would like to wish you the best of luck in your quest for victory . After all the blood sweat and tears which have gone into this project it would be a fantastic conclusion to the season .

cheers

jason

Jason - yes, angles have been judged as far as possible to be in the middle of the range that will work. Without wind tunnel I will never really know but it is 10 degrees angle and extends about 1 metre in front of the 'turn' to enable some laminar flow of air prior to it.

I've always wanted to do that bit anyway and with the exhaust out of the way it was made as wide at the wheel base would allow it.

Hardcore - yes. As Gary at APT knows, dry sump is what is needed for serious track work. Hoping that the kit works as well on track as early indications show us from spirited road tests. Without it I know I would suffer bad oil surge there (thats what started the death of the last build in march) so it is a case of balancing risks...