Whats our real drivetrain % loss? - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 26 (permalink) Old 01-30-2012, 03:19 PM Thread Starter
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Whats our real drivetrain % loss?

I was combing thru various dyno vids on youtube to get an idea of what other cars are making bone stock. I have seen on more than one occasion Chrysler guys claiming to lose 25%. That seems extremely high. I though 18% was more reasonable for any automatic. What is ours?


Current Toys:
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Doug Thorley Long Tube Headers, AFR Intake, HP Tune by "OBSSSD", Magnaflow Catback

Intake/Cortex: 13.20@105.8
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post #2 of 26 (permalink) Old 01-30-2012, 03:40 PM
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I don't know specific for our cars, but automatics are usually between 15-20%
I have No tune, only CAI & catback and it gave me 310whp. I'd say that at most the CAI and cat-back would give me 10hp. So that puts it around 17%, but then again that's guessing.

Jeff
09 GT Premium + Sport + Webasto Sunroof
20/20/5 tint + GXP Diffuser + VVME 6000K HIDs + Camaro SS 20" 245/35 & 275/30
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310rwhp 314rwtq on Mustang dyno(stock tune)
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post #3 of 26 (permalink) Old 01-30-2012, 03:46 PM
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I seem to hear between 17-20% for auto and like 10% for manual.
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post #4 of 26 (permalink) Old 01-30-2012, 04:36 PM
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Not all automatic transmissions are built equally.
I hear that the dodge transmissions are big time power eaters.

My friend lost 25rwhp going from his 4L60e to th400



-VCM intake, DT headers, Solo Axleback, Pat G tune, 12.9@109 and 365rwhp/370rwtq
-Avant Garde M310 20x8.5 and 20x10 milled to +40, 245/35/20 and 275/30/20, H&R springs, Koni inserts and shocks, Neondial corners, Painted gloss black roof, Painted Matte black bumper and grill inserts
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post #5 of 26 (permalink) Old 01-30-2012, 04:38 PM
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I put my bone stock 08 GT on a Dynapack dyno when I first got the car. It put down 290 rwhp and 310 ft/lb rwtq. So for me it seems 20% loss was the average.
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post #6 of 26 (permalink) Old 01-30-2012, 05:31 PM
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on my 403 tested on engine dyno versus car dyno with 6L80 and camaro rear diff... loss was 19%.....

for me with the 9" I also hear its eats another 20-25 rwhp and I am sure my 4L80 will eat up a bit more.......

so depending on your whole setup... it will vary... but I would guess most almost stock trans/rears will lose anywhere from 15-21%...

09 Panther Black G8 GT
4L80/Procharged F1d/9"rear/430 lsx; 921rwhp; :Worlds Heaviest G8.. ... lol... --4350 lbs without driver VECTOR tune
(I work for GM-- all statements from me are opinions of my own and does not represent GM in any way.)
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post #7 of 26 (permalink) Old 01-30-2012, 06:37 PM
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I'd say it depends on the car, but I'd wager its closer to 20% than 15%, stock auto GXP's have been dynoed around 330-340whp, they're rated @ 415 crank from the factory. My intake/exhaust/dyno tuned GT made 332whp, its probably between 405-415 @ the flywheel.

So I think 19-20% is about right for an auto. More like 14-15% for a manual.

Oh, and my car dynoed 293whp stock...so 19%ish from the factory I guess

'08 GT sport/premium, tints 20/35, 18" TSW nogaros w/ bridgestone blizzak winter, 19" sport oem w/ hankook evo summer, Philips crystalvision bulbs, debadged, Vararam OTR, JBA 1-3/4" LT's, ported TB, MF axlebacks, MF X-pipe, DBA-powerslot brakes, russel SS lines, hawk ceramic pads, GXP shocks/struts, lovells poly strut mounts, Slowhawk Tuned 344/356

Gone -'04 GTO A4 2.5" custom exhaust, sweet thunder muffs, H pipe, Z06 heads, Baer brake it, 20% tints, torrid red, AEM brute force intake, tuned
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post #8 of 26 (permalink) Old 01-30-2012, 06:44 PM
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Quote:
Originally Posted by slo gto View Post
Not all automatic transmissions are built equally.
I hear that the dodge transmissions are big time power eaters.

My friend lost 25rwhp going from his 4L60e to th400
got that right! on my 05 viper truck theyre said to have 505 hp crank and on a dyno it peaked out at only 410hp wheels.

kooks LT headers, hi flow cats, x pipe, corsa exhaust, Vararam CAI, ported TB/intake manifold, underdrive pulley, catch can, qtp electric cut outs, 160 t stat, HSRK, H&R lowering springs, BMR sway bar

12.6 @109-old tune
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post #9 of 26 (permalink) Old 01-30-2012, 07:15 PM Thread Starter
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Good info guys...thanks


Current Toys:
2009.5 PBM G8 GT
Doug Thorley Long Tube Headers, AFR Intake, HP Tune by "OBSSSD", Magnaflow Catback

Intake/Cortex: 13.20@105.8
Headers/Catback/Tune: TBD

in garage..
2008 Suzuki Hayabusa 9.48@140
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post #10 of 26 (permalink) Old 01-30-2012, 09:30 PM
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Yep 16% loss is a good number for the G8.

Ken's 2009.1 Pontiac G8 GT Pacific Slate Metallic -Premium
Rotofab CAI, Kook's 1 3/4 LTs, HF Cats, 3" X-pipe, Stock Mufflers, PLX WB O2 & Aeroforce gauges
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VMR Solar Rain V701 Staggered 19x9.5+50 & 19x8.5+35, Hankook V12 285/35 & 255/40
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post #11 of 26 (permalink) Old 02-01-2012, 09:54 AM
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GM claims 361hp (flywheel) for a stock G8.
People with stock cars seem to be making 290-295rwhp.

assuming 20% loss and 290rwhp, 290/.80= 362hp
assuming 18% loss and 295rwhp, 295/.82= 359hp

It's safe to assume we lose between 18% and 20% through the drivetrain, more or less.

2012 Mustang GT, M6, 3.73's, Base/Brembo Package
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Magnaflow 14619, K&N Drop Filter, Airraid MIT, UPR Catch Can, American Outlaw Deputy 17x9, BFG 285/70/17 TKO, Bilstein 5100's
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post #12 of 26 (permalink) Old 02-09-2012, 10:19 PM
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yup close to 20% loss on autos, I made 288hp/312tq stock on 93 octane

ChrisD '09 G8 GT
1.93 12.67@110.1 Vararam, VMSpowercal, Kooks 17/8, 2.5" exh, UDP, 19"RE050A, 351hp/361tq
1.85 12.29@113.1 VMS 227/239, FAST, Yank3200, 18"M/T, VMSdyno 440hp/407tq
1.75 11.92@116.2 3.45, 3"exh, 20"R888, dynojet 426hp/368tq
1.61 10.99@126.2 Rick Crawford's 223/231cam, heads & manifold, 17"M/T ET
http://youtu.be/lwaQXBftXXY
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post #13 of 26 (permalink) Old 02-09-2012, 10:35 PM
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Depending on dyno and the car anywhere from 15-20%! I'm just glad it's not as much as the AWD Audi's and some of the Chrysler drivetrains!

2008 MGM G8 GT
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post #14 of 26 (permalink) Old 02-04-2013, 03:31 PM
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Old post, I know, but it's relevant.

I just recently (as in last Saturday) got my new set-up tuned by Pat G & Kurt, and now that I have an official dyno readout I've been trying to figure crank hp.
At 18% loss, I'm at 502.68 (!!) hp and 483.9 tq.
I would guess that the losses are the same, tranny tune or not, but I had no idea I'd be making that kind of power.
I guess we're fairly sure it's ~18%, but it's still hard to grasp for me.

2008 G8 GT PBM, DOD Delete, Pat G Spec'd Cam, 7.4 Hardened Pushrods, Comp Trunion Kit, PAC 1518 Springs, ARH 1 7/8" LT Headers Catted Exhaust, Spectre CAI, Pat G Tune.
412.198hp/396.828tq at the Wheels - Mustang Dyno

1/4 Mile, Very First Run, Stock: 13.66 @ 102.74 w/ a 2.067 60'
1/4 modified 12.49 @ 114

2008 G8 GT MGM, Leather w/ Red Inserts, Sun Roof, 18" Bremmer Wheels
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post #15 of 26 (permalink) Old 02-04-2013, 04:54 PM
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My LY7 was on the dyno back in oct and way at 223.18 RWHP AND 224.85 MAX TOURQ, so mine is a shade over 10%. The LY7 is rated at 256HP at the crank about 12-13% loss,not bad..

2009 GT White Hot, AKA CASPER, Superchips 93 octane tune, Volant C.A.I with HSRK,Slotted and cross drilled rotors with ceramic pads,GXP Diffuser,Debadged.Solo axle backs, Coronet 440 style tips
Dyno 4/26/15,343 MAX H.P.,338.6 MAX TORQ
5/13/15 13.42@103.66, 2.03- 60'."WE ARE THE LAST OF OUR KIND"
2009.1 V6 STRYKER BLUE, TRADED IN 1/10/13
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post #16 of 26 (permalink) Old 02-04-2013, 05:28 PM
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Check sig for numbers stock. My M6 is roughly 12.5% loss.

2009 G8 GXP, SRM, M6, Onyx, Roof. (#1818 of 1829) a.k.a Gianna
Show: Tint, VG Sharkfin, 3M clear bra, 6000k HIDs, 20" TSW Interlagos.
Go: BMR, GForce, MGW, Monster Clutch, 3" SOLO, Dynotech, Squash DW255s, Tein, NLP Twin Turbo!
Stock: 363 whp/367 tq SAE (Dyno Jet) 13.149 @ 108.21 mph
Mods (old): 399 /399 SAE (Dyno Jet) 12.711 @ 108.66 1.548 60' w/MT ET Streets
Mods (new): 602/614 SAE 10 psi, 6* (Dyno Jet) 11.33 @ 125.26
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post #17 of 26 (permalink) Old 02-04-2013, 06:10 PM
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Re: Whats our real drivetrain % loss?

So what percentage would it be to say that a 3600 stall, is eating up?

2008 gt, lsa 9psi, meth, rcr blower cam, Lingenfelter ls3 heads, ls7 maf, crawford tb, kooks headers &mid pipe magnaflow mufflers, spohn toe & lowers
10.38 130mph 1.56 60ft PB
11.29 122pmh 1.67 60ft (old n/a setup)
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post #18 of 26 (permalink) Old 02-07-2013, 04:15 PM
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Also depends if you have 20" wheels, they suck up power too.

'09 SRM GT. VCM Intake, Saxonpc MAF Screen 5:1, Cortex,1.85 Rockers/105# Springs, JBA shorty's, Solo H/F Cats, Solo Mach Balanced. BMR Sway bars, Superpro strut mounts, Whiteline Rear Subframe Bushing, Mevotech arms. PPV struts/shocks, Tein Springs. MPSS Tires
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post #19 of 26 (permalink) Old 02-07-2013, 06:24 PM
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Quote:
Originally Posted by GT Drew View Post
Also depends if you have 20" wheels, they suck up power too.
If they are close to the same rolling diameter as the stock 19's they shouldn't correct? My rears are only .04" different.

275x.4= 110/25.4= 4.33+19= 23.33"

285x.3= 85.5/25.4 = 3.37+20= 23.37"

2009 G8 GXP, SRM, M6, Onyx, Roof. (#1818 of 1829) a.k.a Gianna
Show: Tint, VG Sharkfin, 3M clear bra, 6000k HIDs, 20" TSW Interlagos.
Go: BMR, GForce, MGW, Monster Clutch, 3" SOLO, Dynotech, Squash DW255s, Tein, NLP Twin Turbo!
Stock: 363 whp/367 tq SAE (Dyno Jet) 13.149 @ 108.21 mph
Mods (old): 399 /399 SAE (Dyno Jet) 12.711 @ 108.66 1.548 60' w/MT ET Streets
Mods (new): 602/614 SAE 10 psi, 6* (Dyno Jet) 11.33 @ 125.26
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post #20 of 26 (permalink) Old 02-07-2013, 06:51 PM
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Total weight of wheels and tires is what eats the hp. Plus how far out from center that weight is carried. If the wheels weighed exactly the same but are 20 and 19 the 20 would require more hp to turn since the hoop of the wheel is out farther from center.
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