Pulleying down....3.6 or 3.4....?
10-08-2016, 11:46 AM
#1
Le Mans Master
Thread Starter
Pulleying down....3.6 or 3.4....?
I have a stock bottom end ls2,running a v2 ti trim blower with a 4" pulley + meth (585/518). Looking to pulley down and make some more hp.....was thinking a 3.6"....but have been told to just go to a 3.4" and not have to tach it out to get the power (more low/mid range power)....thoughts?
10-08-2016, 05:04 PM
#3
I don't know where or what your peak blower speed is but typically you would want that to be where your cam is spec'd to peak, but I'd ask your tuner
if you're concerned about making too much power can always just pull a little timing or richen it up a bit at peak torque to keep stock bottom end happy? lot of guys making far more than 550whp on stock bottom end cars for many many miles though.
if you're concerned about making too much power can always just pull a little timing or richen it up a bit at peak torque to keep stock bottom end happy? lot of guys making far more than 550whp on stock bottom end cars for many many miles though.
10-08-2016, 07:25 PM
#4
Le Mans Master
Thread Starter
I don't know where or what your peak blower speed is but typically you would want that to be where your cam is spec'd to peak, but I'd ask your tuner
if you're concerned about making too much power can always just pull a little timing or richen it up a bit at peak torque to keep stock bottom end happy? lot of guys making far more than 550whp on stock bottom end cars for many many miles though.
if you're concerned about making too much power can always just pull a little timing or richen it up a bit at peak torque to keep stock bottom end happy? lot of guys making far more than 550whp on stock bottom end cars for many many miles though.
ls2 with ls3 heads.
10-09-2016, 09:49 AM
#6
Race Director
Member Since: May 2004
Location: Raleigh, NC
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St. Jude Donor '15
Is this the same as ECS's "1500"?
If so I'm on 3.25 too
If so I'm on 3.25 too
10-09-2016, 11:35 AM
#7
Le Mans Master
Thread Starter
10-10-2016, 12:35 AM
#8
Gen4 rods/pistions will take more than you think, especially since you're running meth. You'll run out of fuel on a BAP before you need to worry about the sbe so long as the tune is right. I have a YSI and we might pulley down to a 3.4 rather than the 3.6 we have on right now.
Last edited by Ant-Man; 10-10-2016 at 12:36 AM.
10-10-2016, 07:15 AM
#9
Drifting
Interested in this as well, also running a T-trim on a 4" with meth. Was going to head down to RPM for a pulley swap earlier this fall, just couldn't find the time. It seems like 700 whp is the norm for a lot of the LS2s out of ECS.
10-10-2016, 05:39 PM
#10
Once my fuel lines come in I'll be driving up to RPM to have Fran retune my heap as well.
Last edited by 0FUXGVN; 10-10-2016 at 05:39 PM.
10-13-2016, 12:43 PM
#11
Le Mans Master
Thread Starter
About what kind of power level should I expect with a 3.4"pulley,lt headers and z06 exhaust? (Z51 gearing 3:42 6 speed)
10-13-2016, 02:38 PM
#12
Instructor
Mine made 701rwhp with a 4" pulley T-Trim with just 93 octane. Also is cammed and has a Fast102 intake though. I plan on converting to E-85 at some point and I'll pulley down to a 3.4. I think i'll be at the ragged edge of what the block and internals can handle at that point though. Really not chasing any numbers though, I'd just like to gain some power in the middle of the power band.
10-13-2016, 02:54 PM
#13
Just finishing 8 rib, direct drive, 10% od, 3.33, second meth nozzle, and ecs fuel system. Hopefully retuned in a week or so.
10-13-2016, 05:55 PM
#14
Le Mans Master
Thread Starter
Mine made 701rwhp with a 4" pulley T-Trim with just 93 octane. Also is cammed and has a Fast102 intake though. I plan on converting to E-85 at some point and I'll pulley down to a 3.4. I think i'll be at the ragged edge of what the block and internals can handle at that point though. Really not chasing any numbers though, I'd just like to gain some power in the middle of the power band.
10-13-2016, 10:44 PM
#15
10-13-2016, 10:46 PM
#16
10-16-2016, 06:58 PM
#18
FWIW, I just got off they dyno the other day with my Grand Sport m6
A&A v3 si 3.4 pulley (6 rib still no slipping), Alky meth, cam, Kooks headers, xpipe, B&B fusion catback, ECS stage 1 fuel system. Stock motor with cam and stock driveline. 710/645 SAE. 10.9 max A/F
A&A v3 si 3.4 pulley (6 rib still no slipping), Alky meth, cam, Kooks headers, xpipe, B&B fusion catback, ECS stage 1 fuel system. Stock motor with cam and stock driveline. 710/645 SAE. 10.9 max A/F
Last edited by underconstruction; 10-16-2016 at 07:04 PM.
10-16-2016, 08:15 PM
#19
FWIW, I just got off they dyno the other day with my Grand Sport m6
A&A v3 si 3.4 pulley (6 rib still no slipping), Alky meth, cam, Kooks headers, xpipe, B&B fusion catback, ECS stage 1 fuel system. Stock motor with cam and stock driveline. 710/645 SAE. 10.9 max A/F
A&A v3 si 3.4 pulley (6 rib still no slipping), Alky meth, cam, Kooks headers, xpipe, B&B fusion catback, ECS stage 1 fuel system. Stock motor with cam and stock driveline. 710/645 SAE. 10.9 max A/F
10-17-2016, 09:24 PM
#20
Le Mans Master
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2020 Corvette of the Year Finalist (performance mods)
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FWIW, I just got off they dyno the other day with my Grand Sport m6
A&A v3 si 3.4 pulley (6 rib still no slipping), Alky meth, cam, Kooks headers, xpipe, B&B fusion catback, ECS stage 1 fuel system. Stock motor with cam and stock driveline. 710/645 SAE. 10.9 max A/F
A&A v3 si 3.4 pulley (6 rib still no slipping), Alky meth, cam, Kooks headers, xpipe, B&B fusion catback, ECS stage 1 fuel system. Stock motor with cam and stock driveline. 710/645 SAE. 10.9 max A/F