0-60 after GM tune - Page 3 - Saturn Sky Forums: Saturn Sky Forum
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post #31 of 71 (permalink) Old 08-03-2009, 07:53 AM
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Originally Posted by skyonpsi View Post
I have a stock engine/stock turbo/tranny but I have practiocally every possible bolt on that supposedly helps boost performance! My car is a perfect example what can be done to boost performance but not do any internal work. By the way, I'm seeing an average of 23lbs boost WOT!!
So, do you have the GM Performance Upgrade Kit too? Or what tune are you running?

I ask because the stock calibration, right out of the plant, is not capable of boosting that high unless you are at altitude. The reason is, and I have seen this happen, the stock ECU program is constantly learning the car to 260 ft-lb, even if you upgrade bits and pieces around it (exhaust, intake, etc.).

My car has ONLY the wastegate mod and the PUpgrade Kit. The rest of the car is basically stock, including tires. I am experimenting with sensor biasing, but am getting close to spark knock doing stuff like that. I can eke out another 5%-10% torque by doing it, which should translate to better ET/Speed.

But, if you have a tune, WITH intake modifications, AND exhaust AND hi-flow cat, and a grippier tire, THEN you probably do have one of the fastest RedLines I have seen. BUT you are not "stock" per se - because "stock" means "right out of the plant, no add on parts."

Usually. You are more accurate saying you have a stock motor and turbo, trans, but have a few minor mods.

I am a GM Engineer.

I do not claim to be a GM rep., all of my postings are my own interpretation and personal opinions.

I am a proud Solstice GXP owner (Flash). My wife, A FORMER GM engineer, is a proud Solstice GXP Coupe owner (Wicked).
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post #32 of 71 (permalink) Old 08-07-2009, 10:55 AM
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Originally Posted by turbolift View Post
I've had the GMPP upgrade for a couple months now (no other performance upgrades) and today I had to nail it and I redlined at 50mph in 2nd gear at WOT. My boost was reading 19psi. I don't think thats right so I'm taking the car in next Wednesday. In the mean time, does anybody have any idea why I can't reach 60mph in second gear? Thanks.
UPDATE:

I took my car in Wednesday and the service tech was told by GM to reflashed my ECM with the GMPP upgrade and current updates. This morning I got on it and I still can't hit 60 in second gear before I redline. My boost is still at 19psi so I'm at a loss as to what the problem is.

Don

2008 Redline
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post #33 of 71 (permalink) Old 09-07-2009, 06:12 PM
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0-60 in 2nd gear

I am also unable to hit 60 MPH in 2nd gear with the tune. It will only get to about 53-55 mph. Have you had any luck in understanding why this is the case?

GTaylor
Black Onyx Redline
Black interior, Chrome wheels, 5 Speed,
spoiler, 6 CD-XM monsoon, 3 inch Magnaflow exhaust, Opel GT grille,GM Tune, DDM Backbone, Trifecta Tune
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post #34 of 71 (permalink) Old 09-07-2009, 06:31 PM
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probably faster to just pin it against the limiter in second instead of shifting to 3rd. or with HP Tuners or an aftermarket tune you can raise the rev limiter just enough to make it.

2007 Sky RL - Wester's Tuned - GMPP - RMR Bar - Kirkey Seats
Harnesses - SSR's - Dunlop Direzza Z1 - Complete Mod List
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post #35 of 71 (permalink) Old 09-30-2009, 07:02 PM
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I do not have any of the "tunes" installed, the mods I have done are listed in my signature.

I am very pleased to have run on my Dash Hawk 0-60.2 in 4.64 seconds.


Landscape
REDLINE #131984
Forest Green / Tan
N tires
Brake light pulse
V2 WR
Seat and Lumbar Mod
Polished SS IC pipes
Color match eng. cover
VDI Doors
Solo-Mach
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post #36 of 71 (permalink) Old 10-01-2009, 08:40 AM
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Originally Posted by LANDSCAPE View Post
I do not have any of the "tunes" installed, the mods I have done are listed in my signature.

I am very pleased to have run on my Dash Hawk 0-60.2 in 4.64 seconds.

Gotta love those downhill interstate ramps.

2007 Sky Red-Line, Midnight Blue, Opel GT Antenna, JPM console, visors & elbow pads, GMPP PUpgrade, T-Bolt Clamps, DDM ProBeam/Backbone, 1st DDM Under-Hood LED on a Sky!
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post #37 of 71 (permalink) Old 10-01-2009, 09:11 AM
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Originally Posted by e-sarge View Post
Gotta love those downhill interstate ramps.
Agreed; either that or your dashhawk is completely screwed up.

2007 Sky Redline
GMPP Stage 2, GMPP Cold Air Intake
Sequential Tail Lights, WindRestrictor
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post #38 of 71 (permalink) Old 10-01-2009, 10:18 AM
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Flat terrain, and witnessed by my passenger. I know what I ran.


Landscape
REDLINE #131984
Forest Green / Tan
N tires
Brake light pulse
V2 WR
Seat and Lumbar Mod
Polished SS IC pipes
Color match eng. cover
VDI Doors
Solo-Mach
Lil Chromies, Chrome Domes, Billet Grill
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post #39 of 71 (permalink) Old 10-01-2009, 11:13 AM
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Quote:
Originally Posted by gtaylor View Post
I am also unable to hit 60 MPH in 2nd gear with the tune. It will only get to about 53-55 mph. Have you had any luck in understanding why this is the case?
I would trust an OBD2 Scanner or GPS device before your El-cheapo gauge cluster.

These aren't accurate VDO german devices these are Delco +/- 10 Mph devices.

Example: My Acura RSX even the gauges in that were not accurate. Neither RPM or Speed.

I had a data logger and real time visuals on rpm and speed coming from the ECU. My car was usually about 5 mph slower than what the gauge said and the rpm usually 200-400 rpms slower.

Best way to figure out where you car is to get either the ODBII scanner and plug it in and have a friend read to you when you think you are at 60 and such. Or use a GPS it will tell your speed and you can adjust the speed as needed. I know my Sky is 3-5 mph off on the gauges. I never look at the gauges much as they are hard to read if I have my GPS in the car I just use that.

07 SKY Redline Silver
  • Red/Black Leather
  • JPM Custom: Dash, Side panels, Shift boot, Center console Red leather
  • Dejon IC pipes
  • Hahn IC
  • 3" Magnaflow Quad Exhaust
  • DDM BBK (RED)

Last edited by compdoc777; 10-01-2009 at 11:15 AM.
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post #40 of 71 (permalink) Old 10-01-2009, 05:56 PM
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Originally Posted by LANDSCAPE View Post
I do not have any of the "tunes" installed, the mods I have done are listed in my signature.

I am very pleased to have run on my Dash Hawk 0-60.2 in 4.64 seconds.

Landscape
REDLINE #131984
Forest Green / Tan
N tires
Brake light pulse
V2 WR
Seat and Lumbar Mod
Polished SS IC pipes
Color match eng. cover
VDI Doors
Solo-Mach
Lil Chromies, Chrome Domes, Billet Grill
Dashhawk
Green Neon Underbody
I have to agree with you. One Saturday for kicks, I installed a set of blue LEDs under my front end and my ET went down to 4.60 and that's with a GMR tune; I'm thinking blue might result is a slightly faster ET than green.

Last edited by Sky_Pilot; 10-01-2009 at 05:59 PM.
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post #41 of 71 (permalink) Old 10-01-2009, 06:33 PM
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Garage
My old turbo 88 Fiero did 0-60 in 4.55 and a 1/4 about 13 flat. But then it is almost 300 lbs. lighter and a mid-engined car will always have better traction than a front engined one, so we'll call it as close as makes no never mind to the fun factor
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post #42 of 71 (permalink) Old 10-01-2009, 07:40 PM
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Originally Posted by LANDSCAPE View Post
Flat terrain, and witnessed by my passenger. I know what I ran.

so it counted wheel spin.

2008 Sky Redline
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RPi Race Downpipe
Werks Street I/C
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13.688 @104mph (altitude of over 3000')
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post #43 of 71 (permalink) Old 10-01-2009, 11:07 PM
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Originally Posted by Sky_Pilot View Post
I have to agree with you. One Saturday for kicks, I installed a set of blue LEDs under my front end and my ET went down to 4.60 and that's with a GMR tune; I'm thinking blue might result is a slightly faster ET than green.
I think you are gaining the benefit of green in as much as the blue mixed with the yellow of your car creates the speed (yellow + blue makes GREEN), the other 0.04 you picked up was OBVIOUSLY from the tune


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REDLINE #131984
Forest Green / Tan
N tires
Brake light pulse
V2 WR
Seat and Lumbar Mod
Polished SS IC pipes
Color match eng. cover
VDI Doors
Solo-Mach
Lil Chromies, Chrome Domes, Billet Grill
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post #44 of 71 (permalink) Old 10-02-2009, 12:16 AM
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When it comes to 0-60 and qtr mile calcuations, it's very important to understand how the measurements are taken, the inherent accuracy involved, and how the measurements are used to arrive at a calculation.

Dashhawks use a vehicle's internal speedometer measurements to produce the calculations. A speedometer measurement is derived from the rotational rate of the spinning wheel under the assumption that there is no wheel slip. Since the speedometer measurement cannot make the distinction, neither can the Dashhawk. Hence, wheel spin is interpreted as translational motion (which it is not), and therefore results in a CALCULATED 0-60 and qtr mile time that is better than what is/was actually achieved. We don't doubt what you see on the dashhawk display. Rather, we doubt that the dashhawk display reflects the reality of the run.

Racelogic devices use GPS (and possibly accelerometers) to measure the motion of a vehicle. As long as the satellite signals are of sufficient clarity to produce the measurement (possibly aided by accelerometers during any breaks in signal), and are broadcast within spec, the accuracy from these devices should be very close to what is actually achieved. Furthermore, GPS signals lend themselves to post processing, which allows a post run validation of the measurements.

There are some devices that use only accelerometers. These devices depend on the precision of the accelerometers, to include the ability to zero out gravity. They would also be subject to gravity error induced by the movement of the device (e.g., if it's an IPOD), or change in slope of driving surface during the run. If you do use a device like this, make sure it can zero out gravity and keep it FIXED in position during the run.

And then, of course, there's the track where beams of light trigger timing circuits. But even these measurements come with caveats, as the type of staging (deep vs shallow) involves a roll out variable, which affects the calculated values.

2008 Redline Auto
Born 7/20/07
Snagged 8/31/07
Released 8/8/15

Last edited by Bogie; 10-02-2009 at 12:20 AM.
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post #45 of 71 (permalink) Old 10-02-2009, 10:49 AM
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Originally Posted by LANDSCAPE View Post
Flat terrain, and witnessed by my passenger. I know what I ran.

Now I definitely don't believe it. Adding a passenger is going to add about 150-200lbs (obviously an estimate). As such, it would be expected that you would run faster solo. Now way in hell I believe that time with a passenger.

2007 Sky Redline
GMPP Stage 2, GMPP Cold Air Intake
Sequential Tail Lights, WindRestrictor
Fender Lights, JPM Console and Sun Visors
DDMWorks Race Backbone and Pro-Beam
Auto-Dimming Mirror, 6k HID Headlights
Viper Remote Start / Alarm
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