OK, here is a quick'ish sum up of my turbo plan.
My goal is to have a weekend car eventually capable of producing 300whp (maximum) but to run it at around 200-225whp untill I build my motor.
Response is something which matters to me, hence the;
short boost pipes
custom itb inlet
equal length split pulse exh manifold
3" seperated downpipe
extreme thermal management
freeflow cold air inlet
turbo choice (GT28RS)
(could go smaller with the turbo for response but would rather make it up elsewhere and still make good hp top end with a mid range sized turbo)
I have looked at all of these aspects for their help with spool/response. Obviously this will not fully give the desired effect on a standard motor with an MSD timing box but before i can build one and get good engine management, I want to perfect the turbo setup as much as possible.
Its quick and basic summary in the grand scheme of things, and my first turbo car/turbo system design and I would appreciate any feedback or pointers. Dont worry - you wont hurt my feelings and I appreaciate I may be wrong on much of this theory so fire away
The main problem I seem to have is finding a turbo which meets my demands and the intake manifold design (particularly plenum volume and runner length).
The "Disco potato" (GT28RS) has ideal flow capabilities and good spool with its duel ball bearings as far as i can tell but doesnt seem to have "ext wastegate" or "twin entry" as an option. I maybe wrong ? Hopefully !!!
The external wastegate turbo's seem to have a much better shaped area (where the downpipe connects to the turbo) in terms of flow causing no turbulance if that makes sense !?!?! probably not !
Anyway its 00:58am here and I gotta stop thinking about boosted miata's and go to sleep (unfortunately!) or I wont have a job to buy all these nice shiny things
many thanks for reading and I look forward to hearing input from people with miata turbo experience/interest.
theres also some more vids of my car here if you'r interested - YouTube - williamjamesfrost's Channel