RX8 ST170 twinscrew project - RX8Club.com



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Old 07-15-2016, 06:19 AM   #1
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RX8 ST170 twinscrew project

I just have started my engine swap project.
I will fit Ford st170 supercharged engine in it.
Target is to keep good weight distribution and have more power.
List of spec so far:
Twinscrew water cooled billet housing 2.6l/rev supercharger
PEC rods
WOSSNER forged low comp pistons
Clevite head gasket
ARP con rod studs
ARP main studs
ARP head studs
PIPER vvt delete kit
PIPER valve spring kit
Clevite H main bearings
Clevite H big end bearings
Overhouled head with match porting intake
Simens DEKA ported 1200cc injectors - Prepared by BJP race shop
Custom Fuel rail
Jenvey intake manifold
Custom CNC supercharger bracket and support designed by me
MOROSSO oil filter adapter with TORQUES remote oil filter housing
PUMASPEED cranckcase breather vent
AP RACING twinplate clutch CP7372 series.
TILTON 8000 series hydraulic release bearing
Burtonpower lightwight flywheel
Aeromotive FPR
GETRAG 265 transmission
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RX8 ST170 twinscrew project-masina.jpg   RX8 ST170 twinscrew project-rx98-na-prikolici.jpg  
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Old 07-15-2016, 09:34 AM   #2
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A Focus SVT engine in an RX-8, that's a new one. Looks like a well built engine and IIRC they were designed by Cosworth. How much HP is expected? They were like 170HP stock at the crank I think.
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Old 07-18-2016, 12:20 AM   #3
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Yes stock is rated at 170HP on the crank and it is developed by cosworth.
Basically SVT/ST170 engine is upgraded ZETEC engine from 130hp to 170hp.
In USA market engine is carried by Ford Focus ZX3 SVT but in Europe is sold as ST170.
My over thumb calculation is about 500 crank power with current pulley setup.
With current pulleys supercharger will spin up to 10 000 rpm but it is capable to go on 14 000rpm.

Past week we developed custom bell-housing to match engine and Getrag 265 gearbox.
Attached Thumbnails
RX8 ST170 twinscrew project-design-zvon-menjalnika.jpg   RX8 ST170 twinscrew project-zvon1.jpg  

Last edited by Tunkka; 07-18-2016 at 12:44 AM.
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Old 07-18-2016, 07:40 AM   #4
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I'm tracking on this one. I suppose you can't post it in the engine swap section but subscribed. I'm curious to see where this goes.
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Old 07-18-2016, 07:43 AM   #5
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Yeah very interesting, what is the total weight of the engine/supercharger?
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Old 07-18-2016, 03:31 PM   #6
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Subscribing for further details

All the best with your build, keep us posted.
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Old 07-18-2016, 04:02 PM   #7
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It has been moved to the non rotary swapped section.

Lets see what you can do


Travis
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Old 07-20-2016, 12:01 AM   #8
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Yesterday RWD sump kit received and assembled. Will save some weight and get more ground clearance.

Regarding weight - I don't know how much is engine weight with SC on. I will try to get a scale to measure it (you give me big task to measure the weight).
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RX8 ST170 twinscrew project-rwd-sump.jpg  
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Old 07-20-2016, 03:13 PM   #9
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My friend is just crazy. During my full time job (I work as quality engineer in automotive industry) he put engine and tranny together. Than he put the engine into the engine bay to check layout. He cut a bit of firewall to keep front steering geometry in stock form... Stil a lot on to do list, but progress is fast and we want to built as much as possible before summer vacations...
Attached Thumbnails
RX8 ST170 twinscrew project-20160720_154341.jpg   RX8 ST170 twinscrew project-20160720_171123.jpg  

Last edited by Tunkka; 07-20-2016 at 03:15 PM.
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Old 07-24-2016, 02:24 AM   #10
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this is rather unique in its own. i like!!!!!
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Old 07-26-2016, 12:28 AM   #11
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Inter-cooling in progress...
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Old 09-27-2016, 05:49 AM   #12
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Summer vacations gone so I start to prepare custom intake manifold. Quite happy with robustness and appearance so far.
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RX8 ST170 twinscrew project-ni-zadeve-ernest.pancur%40gmail.com-gmail-mozilla-firefox.jpg  
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Old 09-28-2016, 12:31 AM   #13
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Dashboard flocked in deep black colour. Come out very well quality.
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RX8 ST170 twinscrew project-14483723_995287620594294_1002826031_n.jpg   RX8 ST170 twinscrew project-14463868_995287683927621_981096309_n.jpg  
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Old 10-18-2016, 07:13 AM   #14
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After couple of hours spended behind 3D modeling finally bottom supercharger with air outlet bracket done by CNC machining.
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RX8 ST170 twinscrew project-20161017_185148.jpg   RX8 ST170 twinscrew project-20161017_185038.jpg  
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Old 10-26-2016, 08:32 PM   #15
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Following this one. Looks interesting.

Had to cut the firewall on mine too. I'll have to remove the plastic wiper scuttle panel to change the rear spark plug.

Cheers John
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Old 10-27-2016, 12:24 AM   #16
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I didn't really need to cut the firewall but I choose large intercooler and position it horizontally so I choose this compromise to move engine a little bit backwards.
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Old 10-27-2016, 03:21 AM   #17
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I see. I chose to cut the firewall & still run the rx8 box in the original position. Engine sits in about the same position as the rotary too.

Cheers John
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Old 11-12-2016, 04:28 AM   #18
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Last engine mount positioned and at same time this is also bracket for alternator. I use BMW steering rack instead of Rx8 unit. Alternator and rack are dummy parts to test how they sit on the position. New items ordered... And lol engine looks really small
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RX8 ST170 twinscrew project-20161111_205155.jpg   RX8 ST170 twinscrew project-20161111_202923.jpg  
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Old 11-28-2016, 02:06 AM   #19
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Huh I just stuck with fuel delivery system I want to replaced stock fuel pump with 430L one. After disassembling in tank fuel system noticed that 430L pump can't be installed without big diy task. How you guys solved fuel pump system on over 500HP setups. Any ideas? Plase give me advice how to solve issue with in tank system. I know fuel cell with inline pumps is always solution. Thank you.
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RX8 ST170 twinscrew project-430-fuel-pump.jpg   RX8 ST170 twinscrew project-430-fuel-pump-replace.jpg  
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Old 01-03-2017, 12:22 AM   #20
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Intake manifold and throttle body position optimized so now I can start work on air piping. ECU arrived and I decided to go with Haltech for this project. For fuel pumps I found a solution and will be updated soon.
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RX8 ST170 twinscrew project-20161212_193553.jpg   RX8 ST170 twinscrew project-20161219_175038.jpg  
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Old 01-03-2017, 06:33 AM   #21
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Quote:
Originally Posted by Tunkka View Post
Huh I just stuck with fuel delivery system I want to replaced stock fuel pump with 430L one. After disassembling in tank fuel system noticed that 430L pump can't be installed without big diy task. How you guys solved fuel pump system on over 500HP setups. Any ideas? Plase give me advice how to solve issue with in tank system. I know fuel cell with inline pumps is always solution. Thank you.
I am not a fan of the stock fuel system, or the stock means of fuel pickup...I have heard a lot of fuel starvation issues.


My plan is to run these... https://liquidironindustries.com/Wal...k-Pickups.html


They are Walbro fuel pickups, include a mesh screen and a valve that if it starts sucking air, it closes. I plan on putting a couple of these in the bottom of each side of the tank and running an external pump...since I already have the pump.


My off road rig has run upside down with these on more than one occasion, so they work pretty damn well.
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Old 01-03-2017, 07:28 AM   #22
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Thank you for nice proposal. It might change my plans
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Old 01-03-2017, 07:44 AM   #23
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Anytime! Definitely subscribing to this build! I like the engine choice, beautiful fitment, and the manifold came out mint!
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Old 01-27-2017, 12:26 AM   #24
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Hi,

If anyone interested I did measurement of used valve springs vs. performance valve springs. On fist graph you can see stock used ST170 valve springs and on second graph performance. As you can see spring rate for performance springs is much better and more consistent.
Attached Thumbnails
RX8 ST170 twinscrew project-testxpert-ii-ghss-qlaboratory102-tensioning-machinezwick-testsvzmet-1.serija.zp2.jpg   RX8 ST170 twinscrew project-testxpert-ii-ghss-qlaboratory102-tensioning-machinezwick-testsvzmet-piper-cams-3.serija.zp2.jpg  
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Old 01-28-2017, 01:14 AM   #25
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Not knocking the build at all, looks like a great project, just curious why you chose the dated Zetec platform and not the newer Duratec platform? There are a few bolt-on options for 5spd and 6spd trans (including the stock RX-8 trans).

Flyin Miata supercharger (formerly built by Cosworth) on a 2.5L Duratec can easily hit 300BHP with stock internals, more if built. Not sure what your power goals are though, my friends were making 300-350ish whp back in the day with built turbo SVT's. I had a 2.3 Duratec Focus ZX3 with a Garrett GT28r on stock internals, made 260whp @ around 10-12psi. Fun cars.

Anyway, looking forward to seeing this thing finished.
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