Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > 911 / 930 Turbo & Super Charging Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered
 
jebbach911's Avatar
 
Join Date: Dec 2007
Location: Paducah, KY.
Posts: 112
GT2 Cams - Specs please!!

Brain Trust: Anyone who has purchased GT2 cams that still has access to the "valve timing information" sheet that came with the cams, could you please post the "intake opens/closes & exhaust opens/closes for me?

I have recently purchased a donor turbo motor for a track-only 930 and during a complete disassemble have reason to believe that the cams were WAY off. I have the specs of how the cams were timed before disassembly.

I may change a few things to try and enhance low end for track purposes and would love to hear any suggestions from fellow pelicanites.

The grocery list of other goodies in this engine are:
Stock 3.3 Mahle P & C's
stock 930 crank & rods w/ ARP rod bolts
ARP cyl/head studs
GT2 cams
dual plug big port heads 41.5mm IN/38.2mm EX.
Carrera Intake Manifold
MSD, 6 coils/dual plug
Full bay intercooler
DTA Fast engine management
Custom AMS exhaust w/ Tial WG
Precision Turbo AR70 cold/AR68 hot

I will be initially running a 930 4 speed so low end power will be essential. This doesn't have to be a HIGH horsepower build but I am shooting for 550 WHP. This motor made 499 WHP in a street car before being removed.

I am not opposed to modifying the exhaust for twin scroll and changing the turbo.

BTW, does anybody know who has used or specializes in the DTA Fast system to do a dyno tune when I am ready?

I will include some car pics soon!!

__________________
1976 911s,2.7, Cobalt blue, G 40 cams, Weber 40 IDA, SSI / Dansk, MSD 6AL
1991 964 Turbo,3.3 ,Polar silver, Fabspeed headers and exhaust, stock W/G, Greddy EBC, Synapse BOV, BL WUR w/ RPM CSV switch, CIS Fuelhead mods, GT 35 Turbo, Snow W/Meth Inj., K&N Cone Air Filter, AAR delete, Decel valve delete, Zeitronics ZR-2 AFR
1994 968 White, bone stock! (son's first car)
Old 12-31-2014, 11:06 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
jebbach911's Avatar
 
Join Date: Dec 2007
Location: Paducah, KY.
Posts: 112



__________________
1976 911s,2.7, Cobalt blue, G 40 cams, Weber 40 IDA, SSI / Dansk, MSD 6AL
1991 964 Turbo,3.3 ,Polar silver, Fabspeed headers and exhaust, stock W/G, Greddy EBC, Synapse BOV, BL WUR w/ RPM CSV switch, CIS Fuelhead mods, GT 35 Turbo, Snow W/Meth Inj., K&N Cone Air Filter, AAR delete, Decel valve delete, Zeitronics ZR-2 AFR
1994 968 White, bone stock! (son's first car)
Old 12-31-2014, 04:12 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
Bingo

Dougherty Racing Cams Porsche 911, 930 and 964 camshaft profiles
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 12-31-2014, 04:55 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
xbmwguy's Avatar
 
Join Date: Apr 2008
Location: west palm beach fla
Posts: 1,734
Garage
Dougherty said to set cams 2.2-2.4. I went 2.2. I have a similar build with a gt40 turbo and 3.4 p/c. 550 is within your crosshairs
Old 12-31-2014, 05:21 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
xbmwguy's Avatar
 
Join Date: Apr 2008
Location: west palm beach fla
Posts: 1,734
Garage
Sorry. I went 2.3 oops
Old 12-31-2014, 05:21 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,844
Not to be a jackass, but why are you using GT2 cams if your goal is low end torque? Those are on the other end of the spectrum.

I can swap you my Carrera 3.2 cams for your GT2 cams and you'll be all good.
Old 12-31-2014, 05:48 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
Twin scroll, equal length works be a GREAT upgrade. Pulse timing really wakes to a turbo early, doubly true for a turbo designed explicitly for a fully divided twin scroll intake.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 12-31-2014, 06:29 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered
 
jebbach911's Avatar
 
Join Date: Dec 2007
Location: Paducah, KY.
Posts: 112
Hi Tippy, the GT2 cams were in the donor motor when I bought it. I'm not opposed to changing cams. Although I've read that you can get some low end out of the GT2 cams by bumping compression to 8.5:1 and use lightweight flywheel.
Old 12-31-2014, 07:02 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
8.5:1 is critical for GT2 and 993SS for good off idle torque production. Quoted from Dougherty.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 12-31-2014, 07:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
beancounter
 
jwasbury's Avatar
 
Join Date: Jan 2008
Location: Weehawken, NJ
Posts: 3,627
I can't offer any help on the GT2 cams, but just wanted to say that race car is going to be a lot of fun. Looks like a nice set up. Enjoy!
__________________
Jacob
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
Old 12-31-2014, 07:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,844
Quote:
Hi Tippy, the GT2 cams were in the donor motor when I bought it. I'm not opposed to changing cams. Although I've read that you can get some low end out of the GT2 cams by bumping compression to 8.5:1 and use lightweight flywheel.
Race gas? If not, I wonder if the 8.5:1 might be a little high for 550whp? Seems you'd need to be over 1 bar for sure.
Old 12-31-2014, 07:32 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered
 
totle's Avatar
 
Join Date: Oct 2008
Location: Norway / Miami
Posts: 1,324
Garage
Here is The spec on my improved EVO cams

__________________
Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 01-01-2015, 03:39 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
Quote:
Originally Posted by Tippy View Post
Race gas? If not, I wonder if the 8.5:1 might be a little high for 550whp? Seems you'd need to be over 1 bar for sure.
You can get there on pump gas without drama, with knock control and water/meth injection. Heck, with methanol injection, you can get past 700HP.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 01-01-2015, 06:56 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,388
Garage
We are getting ready to build an engine for my car with a 500whp goal and will use similar cams.
I do not have direct experience with them but understand low end will suffer. We are leaving the C/R at 7:1.
Can you tell me the idle and off-boost qualities?
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 01-01-2015, 07:33 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
GJF GJF is offline
Slantnose from HELL
 
GJF's Avatar
 
Join Date: Dec 2004
Posts: 860
I'm running 8.3:1 on pump, well over 1.2, no knock sensor, no meth and have been since 2006, and way past 700. It's all in the tuning.
__________________
It changes from time to time.....
Old 01-01-2015, 07:36 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #15 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
Well there ya go. My 993SS cammed 3.4 should be done by end of month. It cc'ed out at 8.3:1 after twin plugging, as well. 993SS has even more overlap than GT2. Will let you know how it goes. Btw, I'm running knock control.
__________________

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930

Last edited by kenikh; 01-01-2015 at 07:54 AM..
Old 01-01-2015, 07:48 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #16 (permalink)
Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,388
Garage
GJF which Garretts are you using?
Kenik which turbo are you using?
I have not yet chosen a turbo. Need to retain as much low end as possible yet support 500whp.
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 01-01-2015, 08:48 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)
Registered
 
Join Date: Feb 2013
Location: Essen, Germany
Posts: 193
GT2cam

The GT2 cam is a good profile.

The TDC lift is still on the conservative side.

It likes: static compression > 8:1
a " not too small " hot side on the turbo
good velocity in the inlet plenum
not too big exhaust tube diameters

With all done right it pulls from down below.

The high inlet velocity gives you more flexibility in ignition timing - which pays off also in low revs.

If you want it even more torquy then adjust it to 2,5 mm in TDC.

Best reg.

Dirk
Old 01-01-2015, 08:56 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #18 (permalink)
 
Registered User
 
Join Date: Jul 2009
Location: Ontario
Posts: 1,839
Quote:
Originally Posted by RarlyL8 View Post
GJF which Garretts are you using?
Kenik which turbo are you using?
I have not yet chosen a turbo. Need to retain as much low end as possible yet support 500whp.
Hi guys, not to steal the thread, but the GT35R with twin scroll is the best turbo I've had! Spools quick, and no problem supporting 500 ponies. I think the twin scroll may also be a factor in low end power/torque! Philip
__________________
87 930 GHL/Rarlyl8/Garretson/GT3582R/1 Bar/Wevo shift, mounts/Meth inj/LM-2/Custom Fuchs/Carrera intake manifold/Xtreme Carrera heads P&P/3.4/DR 993SS cams/ Mahl/Pauter/JE/Niresist/ARP/twin COP/8.25:1/KEP stage 2/twin tials/close 2,3,4th. MS3Pro Evo 500+ HP, BTSOMP Dyno
Old 01-01-2015, 08:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #19 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,844
Quote:
I'm running 8.3:1 on pump, well over 1.2, no knock sensor, no meth and have been since 2006, and way past 700. It's all in the tuning.
What fuel? I thought he was using stock 930 heads, I see I missed that. Too much cerveza.

Old 01-01-2015, 09:00 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #20 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 09:24 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.