Let's talk LSA pulleys! - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 20 (permalink) Old 08-03-2016, 09:57 PM Thread Starter
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Let's talk LSA pulleys!

So now that I have 90% of my remaining parts in transit for my LSA build I need to figure out my pulley situation. The snout is currently still disassembled for my solid isolator, so I can swap pulleys there no problem, or go lower pulley and leave the upper alone.

Now my motor is on stock internals so I'm not looking to beat any HP records.

Money is not the deciding factor for me, but as with any mod where I have multiple options I will always consider the most cost effective means vs easiest means.

So lets talk features and benefits. I'm all eyes and ears for feed back. Holla back!


LSA, Pat G DOD cam, RCR TB, 4.5IN Intake/MAF,
CNC LS3 Heads, OBX,
H&Rs, Konis, BMR, Brembos, Slotted/Drilled Rotors
3.27 Gears, 2600 Stall, ZL1 pump, Ice tank
Tuned By Pat G and Luis at RPM Speed Center

Bolt ons Street tires
[email protected] 60ft 1.96 Da 700ft

Cam no stall Street tires
[email protected] 60ft 1.75 Da -200

Stall
[email protected] 60ft 1.66 DA 400ft

Zex 125shot
[email protected] 60ft 1.83 DA 2000ft
second gear launch

LSA 1/4???
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post #2 of 20 (permalink) Old 08-03-2016, 10:36 PM
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I kept mine simple. Metco interchangeable 2.4" upper with the stock lower. No slippage using the green belt and 100mm metco idler.

PBM G8 GXP M6-Self flex fuel tune,OBX LTs, Kooks A/B, Monster clutch, 3.45 gear,LSA S/C, cam, fuel system, stock block and stock heads, 12 PSI.
Best e.t 10.41/ best mph 138.7 Half Mile: 168.3 mph
2007 TBSS-Self tune, bolt ons [email protected], 1,560 D.A
1991 GMC Syclone- Self tune/catback [email protected], 4,200ft D.A
https://www.youtube.com/channel/UC0o...xsBDzFImcyBfeA
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post #3 of 20 (permalink) Old 08-03-2016, 10:48 PM
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I'll give my usual LSA advice - head on over to ctsvowners and search a bit. Much larger pool of experience.

FWIW, I'm stock upper, 5 or 10% lower (forgot) on a ati dampener. For me, no need to push it, it blows the tires off most any time.

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post #4 of 20 (permalink) Old 08-03-2016, 11:46 PM Thread Starter
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Quote:
Originally Posted by STAGEUP View Post
I kept mine simple. Metco interchangeable 2.4" upper with the stock lower. No slippage using the green belt and 100mm metco idler.
Nice. I looked it up and the fact you don't have to machine the snout in order to benefit from the interchangeable sizes seems legit.

Quote:
Originally Posted by JCMG8 View Post
I'll give my usual LSA advice - head on over to ctsvowners and search a bit. Much larger pool of experience.

FWIW, I'm stock upper, 5 or 10% lower (forgot) on a ati dampener. For me, no need to push it, it blows the tires off most any time.
Oh I have been there. I have been all over the web. Just wanted to engage with a community of owners that knows me well and has been through the struggle with the G8s.


LSA, Pat G DOD cam, RCR TB, 4.5IN Intake/MAF,
CNC LS3 Heads, OBX,
H&Rs, Konis, BMR, Brembos, Slotted/Drilled Rotors
3.27 Gears, 2600 Stall, ZL1 pump, Ice tank
Tuned By Pat G and Luis at RPM Speed Center

Bolt ons Street tires
[email protected] 60ft 1.96 Da 700ft

Cam no stall Street tires
[email protected] 60ft 1.75 Da -200

Stall
[email protected] 60ft 1.66 DA 400ft

Zex 125shot
[email protected] 60ft 1.83 DA 2000ft
second gear launch

LSA 1/4???
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post #5 of 20 (permalink) Old 08-04-2016, 01:00 AM
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I think the 2.4 is a good choice if you're not looking at maxing everything out. I'm running the Lingenfelter 2.38 but it requires machining the snout. I've got the 8.66 lower on ATI damper and it makes around 16 psi of boost just for reference. The 2.4 and stock lower I think would give you all you want on a stock bottom end...and maybe more!

2009 Hot White G8 GT, CTS-V v1 fronts, Camaro 20's, BMR Sways, Eibach Springs, Rear Cradle bushings. GXP FE3's, BMR rear susp. Kooks 1 7/8 LT headers, RCR custom 3 exhaust, ported LSA blower, 2.38 pulley; Ported heads and TB; LS7 MAF, Racetec pistons, Scat rods, CTS-V crank; FAST 85 injectors; RCR Lunati cam: 219/237 .612/.601, 114 +2 LSA. CTS-V pump/VaporWorx cntlr. Built trans, Methanol injection. Rick Crawford built and tuned. Best 1/4 9.68 @142, 1.42 60'.
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post #6 of 20 (permalink) Old 08-04-2016, 09:20 AM
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Not quite running yet but i have an interchangeable 2.55 upper and stock lower on a stock bottom LS3 with a small cam and e85 fuel system. I'm nervous to pulley up anymore right now until i get it dialed in like this, don't want it on the ragged edge. Hoping to break into the 10's.
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LS3 - Livernois 1C cam - Joker ported LSA - Vaporworx - e85 - 2.55 upper / stock lower

PB: 1.626 60' [email protected] PB Run
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post #7 of 20 (permalink) Old 08-04-2016, 10:40 AM
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Forgot to mention. My combo makes exactly 11 psi.

PBM G8 GXP M6-Self flex fuel tune,OBX LTs, Kooks A/B, Monster clutch, 3.45 gear,LSA S/C, cam, fuel system, stock block and stock heads, 12 PSI.
Best e.t 10.41/ best mph 138.7 Half Mile: 168.3 mph
2007 TBSS-Self tune, bolt ons [email protected], 1,560 D.A
1991 GMC Syclone- Self tune/catback [email protected], 4,200ft D.A
https://www.youtube.com/channel/UC0o...xsBDzFImcyBfeA
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post #8 of 20 (permalink) Old 08-04-2016, 06:26 PM
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Let's talk LSA pulleys!

Hi are you retaining the existing valvetrain? If not what alterations in the detail?
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post #9 of 20 (permalink) Old 08-04-2016, 10:12 PM
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Stock pulley on stock motor I made 6 - 7 psi, with a 2.5 I do 12 - 13. Haven't looked to see if you have a build thread or anything but do you have fuel system to support it all? With just the stock pulley I was running out of fuel on stock system. Ran the Vaporworx stuff and had enough until I went to the 2.5, then needed injectors.

If you want to get really crazy you can do the overdrive lower pulley and keep it easy up top. What my buddy did until he stroked it, now is maxxing out the blower.
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post #10 of 20 (permalink) Old 08-04-2016, 11:03 PM Thread Starter
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Quote:
Originally Posted by DougHG8 View Post
I think the 2.4 is a good choice if you're not looking at maxing everything out. I'm running the Lingenfelter 2.38 but it requires machining the snout. I've got the 8.66 lower on ATI damper and it makes around 16 psi of boost just for reference. The 2.4 and stock lower I think would give you all you want on a stock bottom end...and maybe more!
Right on Doug. I'm going to make it easy on myself and not do anything requiring machining lol. I think you are right about the 2.4 being optimal based on everyones feedback. I don't want to blow the motor for at least another 18 months haha. I don't track the car really anymore so I should be able to keep it rolling for a while under modest boost levels.

Quote:
Originally Posted by wastedrubber View Post
Not quite running yet but i have an interchangeable 2.55 upper and stock lower on a stock bottom LS3 with a small cam and e85 fuel system. I'm nervous to pulley up anymore right now until i get it dialed in like this, don't want it on the ragged edge. Hoping to break into the 10's.
The LS3 is a nice foundation to build that LSA blower on. Better than my 94k plus mile engine haha

Quote:
Originally Posted by pir4te View Post
Hi are you retaining the existing valvetrain? If not what alterations in the detail?
Same valve train. No alterations until I destroy something some day and go with a full on rebuild.

Quote:
Originally Posted by Rawr256 View Post
Stock pulley on stock motor I made 6 - 7 psi, with a 2.5 I do 12 - 13. Haven't looked to see if you have a build thread or anything but do you have fuel system to support it all? With just the stock pulley I was running out of fuel on stock system. Ran the Vaporworx stuff and had enough until I went to the 2.5, then needed injectors.

If you want to get really crazy you can do the overdrive lower pulley and keep it easy up top. What my buddy did until he stroked it, now is maxxing out the blower.
I have a ZL1 pump and 60lb injectors. Should be plenty of fuel for my plans based on feedback from my tuner.


LSA, Pat G DOD cam, RCR TB, 4.5IN Intake/MAF,
CNC LS3 Heads, OBX,
H&Rs, Konis, BMR, Brembos, Slotted/Drilled Rotors
3.27 Gears, 2600 Stall, ZL1 pump, Ice tank
Tuned By Pat G and Luis at RPM Speed Center

Bolt ons Street tires
[email protected] 60ft 1.96 Da 700ft

Cam no stall Street tires
[email protected] 60ft 1.75 Da -200

Stall
[email protected] 60ft 1.66 DA 400ft

Zex 125shot
[email protected] 60ft 1.83 DA 2000ft
second gear launch

LSA 1/4???
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post #11 of 20 (permalink) Old 08-04-2016, 11:08 PM
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Let's talk LSA pulleys!

Quote:
Originally Posted by The Yeti View Post
Same valve train. No alterations until I destroy something some day and go with a full on rebuild.

OK so keeping Custom AFM cam and 1.85 rr?
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post #12 of 20 (permalink) Old 08-04-2016, 11:30 PM Thread Starter
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Quote:
Originally Posted by pir4te View Post
OK so keeping Custom AFM cam and 1.85 rr?
Exactly. My setup is ultra mild and will be fine with boost. Just need to swap valley covers and I'm golden.


LSA, Pat G DOD cam, RCR TB, 4.5IN Intake/MAF,
CNC LS3 Heads, OBX,
H&Rs, Konis, BMR, Brembos, Slotted/Drilled Rotors
3.27 Gears, 2600 Stall, ZL1 pump, Ice tank
Tuned By Pat G and Luis at RPM Speed Center

Bolt ons Street tires
[email protected] 60ft 1.96 Da 700ft

Cam no stall Street tires
[email protected] 60ft 1.75 Da -200

Stall
[email protected] 60ft 1.66 DA 400ft

Zex 125shot
[email protected] 60ft 1.83 DA 2000ft
second gear launch

LSA 1/4???
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post #13 of 20 (permalink) Old 08-04-2016, 11:35 PM
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Quote:
Originally Posted by The Yeti View Post
Exactly. My setup is ultra mild and will be fine with boost. Just need to swap valley covers and I'm golden.


Why swap valley covers, do you have raised bumps on valley cover like the one on the right below?
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post #14 of 20 (permalink) Old 08-05-2016, 01:16 AM
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I'm running metco interchangeable 2.4 upper and 9.1 lower currently making 770whp 700tq running out of fuel . But like previously stated the cts-v forum has way more info



Texas speed 408 stroker,Lingenfelter ls3 ported heads,LSA 2.5 UPPER with 8.1 lower,kooks header header back,custom axel back, adam ace built transmission, squash double pump upgrade, e85 tein lowering , brm sway bar, bmr toe rod , bmr end link, spohn trailing arms, tein springs,tsw nurburgring rims. Icebox. 770WHP 700tq street numbers
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post #15 of 20 (permalink) Old 08-05-2016, 09:15 PM Thread Starter
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Quote:
Originally Posted by pir4te View Post
Why swap valley covers, do you have raised bumps on valley cover like the one on the right below?
exactly


LSA, Pat G DOD cam, RCR TB, 4.5IN Intake/MAF,
CNC LS3 Heads, OBX,
H&Rs, Konis, BMR, Brembos, Slotted/Drilled Rotors
3.27 Gears, 2600 Stall, ZL1 pump, Ice tank
Tuned By Pat G and Luis at RPM Speed Center

Bolt ons Street tires
[email protected] 60ft 1.96 Da 700ft

Cam no stall Street tires
[email protected] 60ft 1.75 Da -200

Stall
[email protected] 60ft 1.66 DA 400ft

Zex 125shot
[email protected] 60ft 1.83 DA 2000ft
second gear launch

LSA 1/4???
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post #16 of 20 (permalink) Old 08-10-2016, 04:00 PM
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I'm going back to a W-body company I used to deal with, Smooth Flow Pulleys.
Dial the boost in. Even might do a larger pulley just for the Winter to make traction easier

'09 PBM GT. #2 "Time to start modding again"
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post #17 of 20 (permalink) Old 08-10-2016, 05:26 PM
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my plan was to run a 10 or 10.5 lower , and keep the stock upper , little more stealthy for the mexico races

09 G8/GT stryker blue 12.13 @ 114 , best mph 115
04 5.7 auto 1 of 273 12.300 @ 110.953 1.74 60ft , 11.49 @ 120 on da bottle , formerly BMR's gto
06 6.0 M6 1 of 227 13.282 @ 106 1.9 60ft


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post #18 of 20 (permalink) Old 08-11-2016, 09:21 AM
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9.55 is as big as you can run on the lower without hitting the AC line. Nothing stealth about a huge lower pulley. It's right there and everyone notices it first. 9.55/2.55 combo is good for #17. Toss on a 2.38 if you are feel like rolling the dice.

Stock idlers on a relocation bracket with a good belt and it won't slip.

Cam selection, tuning, idle speed is all key too to running a sporty pulley combo. Idle vacuum over 75 kpa won't allow the bypass to function properly at idle.
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post #19 of 20 (permalink) Old 08-11-2016, 10:34 AM
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the area infront of my pulley is wide open , granted its been a while since i opened the hood

with the rest of the stuff around the crank pulley , and being blacked out , most will over look its size

09 G8/GT stryker blue 12.13 @ 114 , best mph 115
04 5.7 auto 1 of 273 12.300 @ 110.953 1.74 60ft , 11.49 @ 120 on da bottle , formerly BMR's gto
06 6.0 M6 1 of 227 13.282 @ 106 1.9 60ft


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post #20 of 20 (permalink) Old 08-17-2016, 10:22 PM Thread Starter
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SO I went with the Metco 2.5 pulley. Since they are interchangable I will swap out down the road to a 2.4 if I can support the power. Just gonna play it safe for now until I get the car dialed in 100%

Big shot out to everyone who pitched in on the conversation!
s/c'd cav likes this.


LSA, Pat G DOD cam, RCR TB, 4.5IN Intake/MAF,
CNC LS3 Heads, OBX,
H&Rs, Konis, BMR, Brembos, Slotted/Drilled Rotors
3.27 Gears, 2600 Stall, ZL1 pump, Ice tank
Tuned By Pat G and Luis at RPM Speed Center

Bolt ons Street tires
[email protected] 60ft 1.96 Da 700ft

Cam no stall Street tires
[email protected] 60ft 1.75 Da -200

Stall
[email protected] 60ft 1.66 DA 400ft

Zex 125shot
[email protected] 60ft 1.83 DA 2000ft
second gear launch

LSA 1/4???
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