Gmpp upgrade - Page 2 - Pontiac Solstice Forum
 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #16 of 26 (permalink) Old 01-18-2019, 02:47 PM
Member
 
Join Date: Sep 2007
Location: Boston MA
Posts: 1,422
The GMPP upgrade isn't just a tune so what's the dynamic re: 2 bar vs 3 bar sensors and an aftermarket tune that mimics the GM one?

Driving and working on a Sly 2008 Solstice GXP 5spd 260/260, and the worst-built 2012 LS3 Camaro 1SS to escape from Oshawa.

Gone but not forgotten:
2007 Solstice GXP 5 speed 290/340

Stored and needing to part ways with a 1970 Skylark Custom convertible I have owned since 1989 and turned into a GS455 clone. 462 with 7/8 primary headers, adjustable roller rockers, TA Performance Stage 1 aluminum heads, auto, Chevy 12 bolt, 3.31:1. Sadly a project car now but a driver from '89 to '06.
ChrisBlair is offline  
Sponsored Links
Advertisement
 
post #17 of 26 (permalink) Old 01-18-2019, 02:54 PM
Member
 
raygun's Avatar
 
Join Date: Nov 2014
Location: Dallas, TX
Posts: 1,543
Garage
Send a message via Skype™ to raygun
There's some debate about whether the sensors are really necessary, and whether they're really "3 bar" sensors vs 2.8 or whatever.

The GMPP tune kicks it up to about 24 psi, which is (roughly)~38 absolute. (This isn't entirely accurate as there's an offset and a scale, just like converting between Celsius and Fahrenheit, but it's close enough for the moment.)

That's roughly 2.6 bar. I'm not sure what the stock MAP sensors do when they get close to their limit, but typically sensors don't provide the most reliable data in that condition. In order for the ECM to correctly manage all the little twiddling bits, it needs an accurate boost measurement - which isn't always possible with the stock sensors.

For fun, you could open up the GMPP tune, set the MAP offset and scale to match the stock sensors, and see what happens. I'd guess that you'd just get a boost reduction or fuel cut a little earlier than with the 3 bar MAPs. (It COULD just let you get as much boost as the turbo can generate since you never really hit the ceiling, but fuel delivery would be an issue and Very Bad Things might happen. I'll let someone else try it.)

Trifecta's budget tune - correct me someone if I am incorrect - can work without the 3 bar sensors. I'm guessing they're just really careful. If you want to run something crazy like 30psi, you'd need sensors that can go that high, and over.

Blue-ish 2006 2.4, Werks stage 1 turbo, Borla cat-back, DDM braces, Spec aluminum flywheel, Spec stage 2 clutch, Werks aluminum radiator, some gauges, RKSport hood, Morimoto FX-Rs, GReddy Profec, Norm's fenders

'07 GXP, Werks Big Wheel K04 and tune, Solo catless downpipe, TCE Wilwood 6 piston front brakes, 4-piston rears , stainless brake lines, slotted/drilled rotors, BC Racing BR coilovers, Performance Autowerks intercooler, DDMWorks CAI, charge pipes and braces, RPM rollbar

Last edited by raygun; 01-18-2019 at 02:58 PM.
raygun is offline  
post #18 of 26 (permalink) Old 01-18-2019, 03:01 PM
Member
 
wspohn's Avatar
 
Join Date: Jun 2007
Location: North Vancouver BC
Posts: 6,435
Garage
Trifecta considered it an added complication to have to include the GMPP sensors in their tune at the beginning but got used to doing it as many who had the basic GMPP wanted more.

I already had the GMPP tune (because it was all I could do while under warranty) so they included that in my basic Trifecta tune and later in the enhanced big wheel tune. The GMPP sensors give you no more power - they were just done by GM to match their standardized headroom for sensors.

Current fleet:
1957 Jamaican bodied MGA
1958 MGA Twin Cam (race car)
1962 MGA Deluxe Coupe
1971 Jensen Interceptor
2009 Pontiac Solstice GXP Coupe
2007 BMW Z4M coupe
Recently departed: 1965 Jensen CV8, 1969 Lamborghini Islero S, 1988 Pontiac Fiero GT, 1969 MGC roadster
Mods at https://www.solsticeforum.com/forum/f...thread-102178/

Bill in BC
wspohn is offline  
post #19 of 26 (permalink) Old 01-18-2019, 10:23 PM
Member
 
Greatgab's Avatar
 
Join Date: Oct 2018
Location: Sacramento, CA
Posts: 346
Garage
wspohn - are you still using the Trifecta tune with the bigger turbo?

2008 GXP Aggressive Red - SOL LVR - Trifecta custom switchable tune - DDM CAI/charge tubes/silicone hoses - Werks IC - Solo Hi-flow Cat/Mach Shorty exhaust - DDM Probeam/Backbone/Venom brace - Sprint Booster - Short throw shifter - Full LED conversion w/pulsating third brake light and sequential turn signals - SaddlX & GearTripR center console - Michelin Pilot Sport 4S
Greatgab is offline  
post #20 of 26 (permalink) Old 01-19-2019, 08:45 AM
Member
 
wspohn's Avatar
 
Join Date: Jun 2007
Location: North Vancouver BC
Posts: 6,435
Garage
Yes. Vince hadn't tuned a Kappa before my car although he had been active with Cobalts for awhile. I explained that I wanted to eventually upgrade to a big wheel turbo once my warranty expired and he was kind enough to send me the basic Trifecta tune and then to follow up with a custom tune (absolutely needed when you do anything as serious as changing the turbo) later when I added that.

It took 4 or 5 refinements (send it out, install it, do a data capture to send back to them so they could fine tune, repeat as necessary) to get things perfect.

It is probably possible to do the job in just a couple of tries give all the experience they have had now.

Mine is tuned for 94 octane with no ethanol content (we are fortunate in being able to get that from Chevron here) so I generally avoid full boost when travelling in areas with other mixes, although the built in safeties would probably cut back ignition etc. to compensate safely.

Current fleet:
1957 Jamaican bodied MGA
1958 MGA Twin Cam (race car)
1962 MGA Deluxe Coupe
1971 Jensen Interceptor
2009 Pontiac Solstice GXP Coupe
2007 BMW Z4M coupe
Recently departed: 1965 Jensen CV8, 1969 Lamborghini Islero S, 1988 Pontiac Fiero GT, 1969 MGC roadster
Mods at https://www.solsticeforum.com/forum/f...thread-102178/

Bill in BC
wspohn is offline  
post #21 of 26 (permalink) Old 01-22-2019, 05:52 AM
Member
 
Nervous Norvous's Avatar
 
Join Date: Dec 2017
Posts: 94
Brethern,
What appx. would the HP increase be with the GMPP tune .I have a 2007 GXP

Thx, Nervous
Nervous Norvous is offline  
post #22 of 26 (permalink) Old 01-22-2019, 07:20 AM
Member
 
Join Date: Sep 2006
Location: Lexington, KY
Posts: 5,547
Quote:
Originally Posted by Nervous Norvous View Post
Brethern,
What appx. would the HP increase be with the GMPP tune .I have a 2007 GXP

Thx, Nervous
Search is your friend: https://www.solsticeforum.com/forum/...07/#post782267

John
Lexington, KY
Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked
JohnWR is offline  
post #23 of 26 (permalink) Old 04-28-2019, 11:42 AM
Member
 
Join Date: Sep 2007
Location: Boston MA
Posts: 1,422
Don't know if this thread is still being read but the advertised gain from the GMPP tune kit was 30bhp.

I was more interested in the additional 80 lb/ft it offered. We still get hung up on bhp. Frankly these cars may be 'light' compared to many modern cars but as a two seater they are hardly svelte at all. The torque increase was quite noticeable in the '07 GXP I had the GMPP kit installed on.

One thing that makes me hesitant for several tunes is that vague terms are used to describe the results.

Driving and working on a Sly 2008 Solstice GXP 5spd 260/260, and the worst-built 2012 LS3 Camaro 1SS to escape from Oshawa.

Gone but not forgotten:
2007 Solstice GXP 5 speed 290/340

Stored and needing to part ways with a 1970 Skylark Custom convertible I have owned since 1989 and turned into a GS455 clone. 462 with 7/8 primary headers, adjustable roller rockers, TA Performance Stage 1 aluminum heads, auto, Chevy 12 bolt, 3.31:1. Sadly a project car now but a driver from '89 to '06.
ChrisBlair is offline  
post #24 of 26 (permalink) Old 04-28-2019, 02:04 PM
Founding Member
 
LatinVenom's Avatar
 
Join Date: Jan 2005
Location: Florida
Posts: 10,247
The GMPP tune is about 290BHP not quite 300 as mentioned. The torque is well over 330.

Aggressive GXP at $25,995.00 shipping of $600, MT.
Options:
Air, $960; Chrome Wheels, $545; PCQ, Premium Package (Leather), $525; Radio, 6-Disc with MP3, $495; Monsoon, $395; Premium Acoustic Headliner, $150; and Sport Metallic Pedals, $115; all totals $29,180.00.
No XM/OnStar and NO Spoiler.

MODS (Magnaflow 2.5", BTF Turbo Upgrade wheel,DDM BB,ProBean&tune, Vntrshield, LVKFCB, JPM.
First 1000. Aggressive with everything, NO XM/OnStar. SOLD
~~~~~~~
NASSOA
Founding member
~~~~~~~
LatinVenom is offline  
post #25 of 26 (permalink) Old 04-28-2019, 03:15 PM
Member
 
Join Date: Sep 2007
Location: Boston MA
Posts: 1,422
Advertised as 290bhp and 340 lb/ft and I always wondered what real gains were

Driving and working on a Sly 2008 Solstice GXP 5spd 260/260, and the worst-built 2012 LS3 Camaro 1SS to escape from Oshawa.

Gone but not forgotten:
2007 Solstice GXP 5 speed 290/340

Stored and needing to part ways with a 1970 Skylark Custom convertible I have owned since 1989 and turned into a GS455 clone. 462 with 7/8 primary headers, adjustable roller rockers, TA Performance Stage 1 aluminum heads, auto, Chevy 12 bolt, 3.31:1. Sadly a project car now but a driver from '89 to '06.
ChrisBlair is offline  
post #26 of 26 (permalink) Old 04-29-2019, 08:22 AM
Member
 
wspohn's Avatar
 
Join Date: Jun 2007
Location: North Vancouver BC
Posts: 6,435
Garage
According to GM:

Cobalt 2008-2010 HP & Torque ratings:

280HP @ 4,700 RPM

320 lb,-ft of torque @ 4,300 RPM

This performance upgrade maintains no-lift shift feature on Cobalts and HHR's and adds it for the Solstice/Sky.

Note:

Solstice SKY HP & Torque ratings:


290HP @ 5,200 RPM
MT 340 lb,-ft of torque @ 3,600 RPM

AT 325 lb,-ft of torque @ 3,600 RPM

HHR HP & Torque ratings:
290HP @ 5,200 RPM
MT 315 lb,-ft of torque @ 4,800

AT 315 lb,-ft of torque @ 4,800

Current fleet:
1957 Jamaican bodied MGA
1958 MGA Twin Cam (race car)
1962 MGA Deluxe Coupe
1971 Jensen Interceptor
2009 Pontiac Solstice GXP Coupe
2007 BMW Z4M coupe
Recently departed: 1965 Jensen CV8, 1969 Lamborghini Islero S, 1988 Pontiac Fiero GT, 1969 MGC roadster
Mods at https://www.solsticeforum.com/forum/f...thread-102178/

Bill in BC
wspohn is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac Solstice Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome