drnick

thanks to abby i have a few more parts to add on the front of the engine below is a pic of the parts that i now have, they are the basics of an original FAST kit although the pulley may be modified - im not sure. im slowly assembling a shopping list of the bits and pieces i will need prior to installing and i have a few basic questions for which i hope answers are there.

the bracket has spacers off the back of it, do they all come like this or is this pulling the blower further out than originaly intended? does the pulley look standard FAST?

so far my shopping list includes the tensioner, intake, intercooler and oil supply sandwhich thing.. i know there are more than just these bits but thats where im starting.

drnick

i need to get hold of a crank puley off the car to see whats what i think. does anyone know if its possible to insert a spacer between the crank pulley and the harmonic damper? this may alow me to seperate out the supercharger and power steering belts, the spacers at the back of the bracket are 20mm and will sit the head unit out by the same compared to the standard FAST system. if the pulley also comes out 20mm this may mean i can drive the powersteering from the v belt normaly used for the aircon (car has none).

on the subject of intercooling ive decided to head in the direction of air/water. it seems both systems have advantages but there is more difficulty implementing an air-air system and it may not be as efficient due to packaging in the 928. it seems the inefficiencies diminish with this type of design as boost levels rise and as im not going to be running high levels i would have mainly been left with the inefficiencies.

as for how much boost to run, ive been re-reading old posts and im not certain if there is a stock GTS engine out there with any more than 5-6 psi going into it. thats a bit disapointing really as it looks like i might make more power if i had a standard S4 engine huffed! but we shall see, im some way off having it installed with only 4 parts currently...

Shane

Get one of those Mann-Hummel Provent crankcase breathers.

Don't worry about max boost just yet, get 'er done, first and enjoy what you get once you finish tuning. This will leave you with the option later, when you start jonesin' for more boost.

drnick

has anyone replaced the power steering pump with an electric one?? it would seem like an easier modification to make and would solve my pulley/belt problems conveniently, any info??

SwayBar

An easier modification? I would stop right now and reconsider what you're attempting to do.

There is a reason why Tim Murphy sells FAST fix-it kits.

Jim R.

Looking at that bracket and pulley setup, and knowing what is on my car from Tim Murphy I would get in touch with him about getting the right parts. I doubt that bracket and setup is good for more than 5-6 psi anyway. Don't try to "mickey mouse" a kit together just do it right and you will have much more fun driving instead of fixing/tweaking/modifying/adapting.

Just my opinion, no offense to anyone involved with FAST.

Jim

hacker-pschorr

IIRC Mark Anderson runs an electric power steering pump on his track car.

MarkRobinson

Bracket is good to a tested 600+rwhp/tq: ask marcus Hutchinson, he has the most powerful 928-engined 928 out there. FAST kits were designed for low boost (5-6psi), not high.

drnick

i dont think the GTS engine will cope with much more than 5 psi, 8 maybe? i wouldnt worry about offending me or anyone else involved with the fast kits, as they are no longer in production there is no competition with the murph stuff.

ive been in touch with tim as a matter of fact and he is more than helpful and not at all offended at my suggestion to mix and match a group of parts for my needs. im not saying that my installation will be any better than anyones and may even have some shortcomings, but for where im at im sure it will make me smile and i will have fun making it happen

i didnt think the electric power steering suggestion was so unreasonable, just wanted to know who else had thought of or done this??

Gretch

The bracket is a proven stress point, in the centrifugal blower set up. It is also subjected to vibration. Based only on my "farmers engineering degree", I have concern about your bracket's ability to hold up as well as the Murph one. I particularily do not feel comfortable with the concept of stanchions and the associated longer bolts. These bolts s/b able to be torqued to 30 foot pounds, and not move at all. I also prefer a seperate pulley with its own shoulders for each belt. Alignment of the belts is critical to proper operation and longevity of the system. Cobbeling seperately engineered components together bears some risk.

BC

The electric power steering shouldn't be that hard. Just a honda or toyota hybrid pump for a good price, and hook it up.

Gretch

Other comments....

Tensioner is usually integral to the bracket, do you know what FAST did there? Airbox, is that what you mean by intake?, what do you plan for there? Air filtration system, how will you engineer that? Down tube, will you be going with an intercooler? Blow Off Valve? Cooling modifications, since you are going with a centrifugal, you will have to remove the stock fans. One last thing to think about....the positive crankcase vantilation system will need to be modified, or you will end up with positive pressure in the crankcase when you are under boost. I am interested in your plans for How will these be accomplished.

Best of luck in your adventure.

drnick

hey gretch, i guess us kiwis are adventurous by nature i agree with you though in that my install will be cobbled together and i know that the murph kit addresses all of these issues with an attention to detail and integrity in engineering that mine will lack. i intend to lean heavily on the pioneering efforts of others such as yourself who have either already engineered there own systems or have real world data from instalation in solving the list of problems youve put up there, i like a challenge and its partly why ive started this thread! the other part is simply to document my progress for the interest of others.

brendan, thats what i was thinking too. my friend adds these to rally cars and suggested the electric power steering as an option using parts from a breaker. i was wondering how you decided on the specification of these things in terms of supplying fluid to the rack and steering feel...

JEC_31

Neat project. Good luck, and keep us posted!

(quietly clicks "e-mail notification" option)

MarkRobinson

Gretch: to keep this conversation from going very bad very quick, I'll close my entry to this thread by saying that none of the 40+ FAST brackets have ever failed, whether "keyed" like Nicks' or a non-keyed earlier bracket (like Tim Murphy's initial braket that came from me)

Marcus has proved that the bracket is good for over 700hp: the highest dyno'd 928 so far @ ~620rwhp if I'm not mistaken.

Ya'll have a good day.