Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

GTS Resurrection

Thread Tools
 
Search this Thread
 
Old 07-21-2019 | 11:14 AM
  #46  
ptuomov's Avatar
ptuomov
Nordschleife Master
 
Joined: Jan 2009
Posts: 5,610
Likes: 82
From: MA
Default

To what specs did you have those Colin/Colt cams ground?
Old 07-21-2019 | 12:23 PM
  #47  
PortlandTom's Avatar
PortlandTom
Thread Starter
Rennlist Member
 
Joined: Sep 2002
Posts: 191
Likes: 5
From: Portland, OR
Default

Originally Posted by FredR
Looks very nice!

I see you have fitted vents to all four positions on the cam covers- what are you going to do with the rear vent on the driver's side cam cover?
You'll have to ask Greg. That's a part of his proprietary oil control measures.
Old 07-21-2019 | 12:26 PM
  #48  
PortlandTom's Avatar
PortlandTom
Thread Starter
Rennlist Member
 
Joined: Sep 2002
Posts: 191
Likes: 5
From: Portland, OR
Default

[QUOTE=Kevin in Atlanta;15987842]
Originally Posted by PortlandTom
Here is the engine ready for the test stand. It looks incredible.

The powder coating on the manifold and valve covers wasn't in great shape, so I had it redone, along with hardware plating.

I had done an intake refresh just a couple thousand miles ago, so we were able to reuse some pieces - Hall sensor, knock sensors,CPS, injectors, etc., but most wear items are new, including the 14-pin wiring harness, fuel pressure regulator and dampers, oil pressure sender and spark plug cables.

I really like how the powder coating came out on the manifold and valve covers


/QUOTE]

Which hardware parts were replated and which ones are new? Who did the plating?
The only new plated parts that I can think of were the FPR and dampers. Some bolts are probably new, but everything else was replated. Not sure who Greg used for the plating.
Old 07-21-2019 | 12:27 PM
  #49  
PortlandTom's Avatar
PortlandTom
Thread Starter
Rennlist Member
 
Joined: Sep 2002
Posts: 191
Likes: 5
From: Portland, OR
Default

Originally Posted by ptuomov
To what specs did you have those Colin/Colt cams ground?
Again, you'll have to ask Greg. I only know that it's his mildest grind.
Old 07-21-2019 | 12:32 PM
  #50  
ptuomov's Avatar
ptuomov
Nordschleife Master
 
Joined: Jan 2009
Posts: 5,610
Likes: 82
From: MA
Default

Originally Posted by PortlandTom
Again, you'll have to ask Greg. I only know that it's his mildest grind.
I’m just curious about intake and exhaust durations, are they more like what Colin/Colt profiles are or more like what Porsche profiles are? Also, are you running straight lobes on flat lifters or stock tapered lobes on stock spherical (very large radius) dome lifters?
Old 07-21-2019 | 03:02 PM
  #51  
GregBBRD's Avatar
GregBBRD
Former Vendor
 
Joined: Feb 2005
Posts: 15,230
Likes: 2,481
From: Anaheim
Default

Originally Posted by ptuomov
I’m just curious about intake and exhaust durations, are they more like what Colin/Colt profiles are or more like what Porsche profiles are? Also, are you running straight lobes on flat lifters or stock tapered lobes on stock spherical (very large radius) dome lifters?
Standard Colin Stage 2 cams. These are "Colt's favorite thing to do"....dual intake profile. (That's an entire subject/discussion on it's own,)
These are not what I would design for lobe centers or lobe separation, but they are not my product and everyone has their own ideas. These cams add a little bit of "punch" over a stock GT cam without making the engine "dirty" or killing the bottom end torque. The material and quality is very high and unlike all the Porsche factory cams....they are both available and economical!

Standard style lifters. I use a special lightweight DLC lifter (not like what Colin uses) to keep the spring pressures as low as possible....something very important to me, over my entire career.
Old 07-21-2019 | 03:14 PM
  #52  
ptuomov's Avatar
ptuomov
Nordschleife Master
 
Joined: Jan 2009
Posts: 5,610
Likes: 82
From: MA
Default

Originally Posted by GregBBRD
Standard Colin Stage 2 cams. These are "Colt's favorite thing to do"....dual intake profile. (That's an entire subject/discussion on it's own,)
These are not what I would design for lobe centers or lobe separation, but they are not my product and everyone has their own ideas. These cams add a little bit of "punch" over a stock GT cam without making the engine "dirty" or killing the bottom end torque. The material and quality is very high and unlike all the Porsche factory cams....they are both available and economical!

Standard style lifters. I use a special lightweight DLC lifter (not like what Colin uses) to keep the spring pressures as low as possible....something very important to me, over my entire career.
Thanks for the info. Any concerns with running the stock radiused lifter bucket on the straight non-taper love of the colt cams? At least I’m measuring no taper in those.
Old 07-22-2019 | 12:54 PM
  #53  
GregBBRD's Avatar
GregBBRD
Former Vendor
 
Joined: Feb 2005
Posts: 15,230
Likes: 2,481
From: Anaheim
Default

Originally Posted by ptuomov
Thanks for the info. Any concerns with running the stock radiused lifter bucket on the straight non-taper love of the colt cams? At least I’m measuring no taper in those.
I've used several sets of these cams, with no issues (regarding taper.)
Keep in mind that I run new DLC lifters, which are very "lobe friendly" along with very conservative spring pressures, so I may not see compatability problems others may experience.
Old 07-22-2019 | 01:01 PM
  #54  
ptuomov's Avatar
ptuomov
Nordschleife Master
 
Joined: Jan 2009
Posts: 5,610
Likes: 82
From: MA
Default

Originally Posted by GregBBRD
I've used several sets of these cams, with no issues (regarding taper.)
Keep in mind that I run new DLC lifters, which are very "lobe friendly" along with very conservative spring pressures, so I may not see compatability problems others may experience.
Flat lifter on non-tapered lobe is correct, and the offset will provide the rotation so there’s no issue there. The blue engine in my car currently has flat lifters and non-tapered lives.

There’s probably no issue running the stock spherical lifter on non-tapers lobe either, but not sure about that. Just curious about how significant people think these minor variations are.
Old 08-04-2019 | 07:19 PM
  #55  
PortlandTom's Avatar
PortlandTom
Thread Starter
Rennlist Member
 
Joined: Sep 2002
Posts: 191
Likes: 5
From: Portland, OR
Default It's Alive!

I've been remiss in my reporting. Over the last couple weeks, the following has happened:

Greg got my engine running on his test stand. Started right up, and ran fine for about an hour total. Just needs a little tuning.

I tried to post a video of the engine running, but couldn't get Rennlist to take it.




Then he installed the engine back into the cleaned-up engine compartment. A bunch of new stuff went into the engine compartment (some of which I had stockpiled):

- Clutch pack and flywheel
- 14 pin electrical harness
- PS pressure hose
- AC hoses
- Clutch master
- Rebuilt clutch slave
- Oil pressure sensor
- Coolant reservoir and hoses
- GB alternator
- GB fuel lines and oil cooler lines (installed shortly before engine failure)

While installing the engine they found two problems:

- One cooling fan was barely running, causing the other to run constantly. Greg replaced them both.
- The AC condenser had a hole on the underside, apparently from corrosion. Not sure when this happened. I'm sure the AC worked the last time I used it, but not sure how long ago that was. So Greg found a new condenser, and replaced the compressor at the same time (He said Denso is practically giving them away.)





With those problems resolved, the car is now back together and is currently being road tested!
Old 08-04-2019 | 08:29 PM
  #56  
merchauser's Avatar
merchauser
Three Wheelin'
 
Joined: Jan 2017
Posts: 1,801
Likes: 44
Default

looking so very sweet.....good work
Old 08-04-2019 | 08:50 PM
  #57  
andy-gts's Avatar
andy-gts
Drifting
 
Joined: Aug 2006
Posts: 2,232
Likes: 12
From: lawrence,kansas
Default

very beautiful !!!
Old 08-04-2019 | 09:20 PM
  #58  
Mrmerlin's Avatar
Mrmerlin
Team Owner
 
Joined: May 2004
Posts: 28,639
Likes: 2,666
From: Philly PA
Default

Thats the money shot, lots of fresh parts in that engine bay.
This is the best way to breath new life into a super car.

The West Coast guys at Gregs shop do very nice work.
Your fortunate to have this car fixed their and so is the car.
Keep em flying!
Old 08-04-2019 | 10:05 PM
  #59  
Kiln_Red's Avatar
Kiln_Red
Rennlist Member
 
Joined: Jul 2010
Posts: 1,716
Likes: 364
From: Bowling Green, KY
Default

Excellent thread and details. I always love a good salvation story. Congratulations to you for your GTS resurrection! Let's get a look of the whole beast.

EDIT: I missed the post with the photos of the car. Beautiful combo. Love it!
Old 08-05-2019 | 11:22 AM
  #60  
cobalt's Avatar
cobalt
Rennlist Member
 
Joined: Oct 2003
Posts: 22,753
Likes: 2,332
From: New Jersey
Default

Glad to see you are back up and running. IIRC there were around 11 Amazon green GTS's made and only 2 I believe with 5 speed box. Mine is the other M with cashmere interior. I believe and don't want to speak out of line so correct me if i'm mistaken. Back when I was searching for my GTS I came across your car and there was a bit of controversy over the actual miles. Not sure if it's so but was told the later cars with electronic odo can be checked to see if any odo tampering had occurred. Might be worth checking. Would be interesting to see if this is age or mileage related.

Looks like it will be better than when you first purchased it. All the best and fun driving.


Quick Reply: GTS Resurrection



All times are GMT -3. The time now is 04:17 PM.