928-LS Tech
Thread Starter
Rennlist Member
Joined: May 2009
Posts: 2,762
Likes: 13
Last plumbing enigma.... mate GM PS pump to 928 rack.
Which one is the high pressure port and return port?
928PSrack_zps2e965023.jpg
Which one is the high pressure port and return port?
928PSrack_zps2e965023.jpg
Last edited by xschop; Apr 22, 2013 at 03:15 PM.
Thread Starter
Rennlist Member
Joined: May 2009
Posts: 2,762
Likes: 13
Didn't have an LS flywheel lock. The higher gear ratio of the 928 box allowed for dropping trans in 1st gear, setting hand-brake, and using an XS cheater bar to install the new F-body harmonic balancer.
WP_000303_zpsdf7878e0.jpg
WP_000303_zpsdf7878e0.jpg
Thread Starter
Rennlist Member
Joined: May 2009
Posts: 2,762
Likes: 13
And I didn't have to machine it
I asked months ago if the 928 PS pump (one that looks like a 944 PS pump) is the same thing. I machined an adapter bracket and 6-rib pulley then plumbed in all the factory lines and didn't worry about pressure/flow issues. Eric at TPC says he's had ZERO issues with the GM PS pump on the 928 rack, it must flow more volume, it is a bigger rack no doubt.
S5000035-2.jpg
S5000036-3.jpg
S5000040-1.jpg
I asked months ago if the 928 PS pump (one that looks like a 944 PS pump) is the same thing. I machined an adapter bracket and 6-rib pulley then plumbed in all the factory lines and didn't worry about pressure/flow issues. Eric at TPC says he's had ZERO issues with the GM PS pump on the 928 rack, it must flow more volume, it is a bigger rack no doubt.
S5000035-2.jpg
S5000036-3.jpg
S5000040-1.jpg
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
Genius Porsche-Themed Gifts That'll Make Any Dad or Grad Smile
Joe Kucinski
10 Used Porsches Are Selling for Way Too Cheap
Joe Kucinski
Tuner Is Converting Porsche 911s Into Shooting Brakes
Verdad Gallardo
This Coachbuilt Creation Is A Modern Take on the Legendary Porsche 917
Verdad Gallardo
Is This Convertible Cayenne A Steal, Or A Returnless Investment?
Verdad Gallardo
10 Best Non-Flat Six Porsches You Can Buy For Under $100K
Joe Kucinski
Porsche's Top 5 Most Questionable Naming Decisions
Verdad Gallardo
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field
Verdad Gallardo
6 Convertible Top MYTHS Most People Don't Understand!
Michael S. Palmer
Rennlist Member
Joined: Feb 2005
Posts: 1,559
Likes: 95
From: NC
I really hope you used an LS specific damper install tool here, and not just a bolt. There is a nice one for about $50 most LS guys use.
Rennlist Member
Joined: Oct 2009
Posts: 514
Likes: 9
From: Incline Village, NV & Phoenix, AZ
Just wrote a long post on GM pumps for the track. Hit the wrong button and it's gone. Here's the short version.
For TRACK USE-don't use GM style pumps-they won't hold up to sustained 6-7k rpm. Go with KRC aluminum 9,000 pumps, a properly placed unvented reservoir, GM fluid and bleed the **** out of the rack by putting a high speed drill on the pump arbor while racking the steering wheel. They're expensive, but almost anything that really works on the track is.
For TRACK USE-don't use GM style pumps-they won't hold up to sustained 6-7k rpm. Go with KRC aluminum 9,000 pumps, a properly placed unvented reservoir, GM fluid and bleed the **** out of the rack by putting a high speed drill on the pump arbor while racking the steering wheel. They're expensive, but almost anything that really works on the track is.
Thread Starter
Rennlist Member
Joined: May 2009
Posts: 2,762
Likes: 13
I thrice heat-tempered an M16 x 2.0 x 120mm bolt with anti-seize to start it half-way, then removed it and installed the rest of the way with a stronger ARP crank bolt with anti-seize.....no problem.
Thanks for the info ASP, the 948 hybriders/track ****** use the Turn-1 PS pump. I'll track mine to work daily. 120mph off-ramp exit with 7-11 coffe in hand lol....
$35 bolt is getting rediculous, I'll machine my own next time round and have it quench-hardened....
ARP234-2503_zpsa9b974f2.jpg
The 928 fuel line fittings are back-assward. As I don't have the fuel-line tool, I sent them off to Eric at TPC to have fuel lines press-fitted to mate these to the easy-connect fittings on the filter....
928fuellinefittings_zps0d986e93.jpg
Thanks for the info ASP, the 948 hybriders/track ****** use the Turn-1 PS pump. I'll track mine to work daily. 120mph off-ramp exit with 7-11 coffe in hand lol....
$35 bolt is getting rediculous, I'll machine my own next time round and have it quench-hardened....
ARP234-2503_zpsa9b974f2.jpg
The 928 fuel line fittings are back-assward. As I don't have the fuel-line tool, I sent them off to Eric at TPC to have fuel lines press-fitted to mate these to the easy-connect fittings on the filter....
928fuellinefittings_zps0d986e93.jpg
Thread Starter
Rennlist Member
Joined: May 2009
Posts: 2,762
Likes: 13
Did a lot of fuel line plumbing and new billet fuel rails with Russell fittings.
Fuel Filter fittings are done. Looks like a high-pressure hard line from the 928 feed is the way to go with O-ring snap fittings at the filter. The return line is simple fuel line with a hose clamp. The adapter from the filter to the rail is a -6an Russell fitting (640940)....
WP_000326_zps66ba70d4.jpg
Talk about lucky, the Ford Contour fan (95-00 V6) shroud fits perfectly with a top-hanger boss and the bottom of the shroud has two areas that are perfect alignment for the radiator bottom lip to drill 2 holes and zip-tie them up.....
WP_000322_zps89a1bbce.jpg
WP_000321_zpse4a0af0c.jpg
WP_000323_zps2861b408.jpg
WP_000324_zps2a9ac4df.jpg
The exact same filter I used on the 948 swap sits perfectly in the area of the shroud that deflects the radiator heat.... Spectre 9732 (10.25" x 6.0")
WP_000325_zpsddb94416.jpg
The original PS pump pulley bolt and washer was bothering me as it was fugly...
So I Lathed out a 0.375 x 1.125 x 0.20" thick billet washer for the PS pump pulley....
WP_000313_zpsc9a1cf67.jpg
Fuel Filter fittings are done. Looks like a high-pressure hard line from the 928 feed is the way to go with O-ring snap fittings at the filter. The return line is simple fuel line with a hose clamp. The adapter from the filter to the rail is a -6an Russell fitting (640940)....
WP_000326_zps66ba70d4.jpg
Talk about lucky, the Ford Contour fan (95-00 V6) shroud fits perfectly with a top-hanger boss and the bottom of the shroud has two areas that are perfect alignment for the radiator bottom lip to drill 2 holes and zip-tie them up.....
WP_000322_zps89a1bbce.jpg
WP_000321_zpse4a0af0c.jpg
WP_000323_zps2861b408.jpg
WP_000324_zps2a9ac4df.jpg
The exact same filter I used on the 948 swap sits perfectly in the area of the shroud that deflects the radiator heat.... Spectre 9732 (10.25" x 6.0")
WP_000325_zpsddb94416.jpg
The original PS pump pulley bolt and washer was bothering me as it was fugly...
So I Lathed out a 0.375 x 1.125 x 0.20" thick billet washer for the PS pump pulley....
WP_000313_zpsc9a1cf67.jpg
Last edited by xschop; Apr 22, 2013 at 01:05 PM.
