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Old 12-20-2013, 06:46 PM   #1
Iam Broke
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SLP 1.85 rocker & spring kit

I've been kicking around a cam but need to stay kinda stock sounding for the emission nazi's OBDII & visual inspection. Saw the SLP rocker & spring kit that will increase lift to ~.600 on the stock cam and wondered if anyone has experience with it?

They claim 12 hp NA so I would expect 20+ on boost but it's a guess.

All input welcome. I know the $1100 price is steep but self install would be easier than a cam swap. Just researching options, TIA.
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Old 12-20-2013, 07:20 PM   #2
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Do cam instead. Just got mild.
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Old 12-20-2013, 07:30 PM   #3
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I don't have any first hand experience but have not heard glowing praise for those that have tried the rockers.
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Old 12-20-2013, 08:57 PM   #4
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Yeah, just looking for options, couldn't find anyone that tried them either.
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Old 12-20-2013, 11:38 PM   #5
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Yeah, just looking for options, couldn't find anyone that tried them either.
I am adding a LS9 cam to mine. Pretty easy install for less than $300 plus like stock longevity
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Old 12-21-2013, 08:53 AM   #6
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They aren't good for your valvetrain geometry, especially if you drive your car hard. Stick with 1.7 and get a baby cam made for boost.
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Old 12-21-2013, 09:34 AM   #7
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Ok, so LS9 cam looks good at 211/230 .558, .552 lift with a 122.5 CL, should idle great and give some gains. Lift is barely more than a stock LS3 (.551/.525) so do I need to worry about upgrading the springs at 8-9 psi? If so, any recommendations? I saw LS9 springs on the Lingenfelter site pretty reasonable.
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Old 12-21-2013, 10:27 AM   #8
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Why don't you just pulley down another step, install the JRE super tensioner so it doesn't slip, and enjoy 11 psi??
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Old 12-21-2013, 11:58 AM   #9
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lol. Lotsa possibilities. Will the JRE supertensioner work with the SLP new design TVS? I didn't think so when I looked before. I don't have any slip with the 3.4" pulley now though.

Squash returnless is first no matter what for more fuel. Still waiting on it...
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Old 12-21-2013, 12:06 PM   #10
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Isn't your dual fuel pump setup keeping up?
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Old 12-21-2013, 12:51 PM   #11
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Nope, drops to 44 psi at redline on the corn. IDC hits 90% in cooler (50*f IAT's) so I'm not too comfortable until I get more fueling. It's dialed in for .78 lambda wot and doesn't lean out up top but I want more of a cushion.

Also need to research the rpm limits of the tvs before I spin it any faster. More pressure = more heat and it'd be better off to do a cam to get the flow up through the engine and let the boost drop some.
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Old 12-21-2013, 01:28 PM   #12
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Yes a small cam would be better, was just thinking pulley change for about the same power increase as a small cam for a lot less money and ease of install.

I also agree your injectors are getting up there because of the fuel pressure. Corn fuel sure needs a lot of pump. Maybe you could install a MSD BAP to get the pressure back up and allow the small cam or a bump in boost, until (if) the squash returnless system ever materializes.

I have heard of others going smaller than a 3.4 pulley but I don't know what crank pulley they were running so I don't know how fast they were spinning.
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Old 12-21-2013, 02:13 PM   #13
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I did some calcs on what I could find with a 7.5 stock crank pully, not sure if 7.5 is correct though.

14,338 @ 6.5k rpm 3.4"
15,234 @ 6.5k rpm 3.2"

I see guys post that they are spinning over 22k rpm on a maggie. Wow! Some post that 16,500 is optimal. Same TVS2300 rotor pack on my SLP I believe. Lots to research, thanks for the input.

Yes, I have considered a BAP but it's only going to help a little bit, I have the voltage to the FP up to 15.5v in boost now in my HPT tune.

Also raised the pressure setpoint in boost (65 psi) using the ZL1 FP settings, but pressure tanked just as bad as leaving it flat at 58 psi.

I could also retune for 60% E but mixing 2:1 with 93 is kinda a pain even for a garage queen.

I have all winter so I hope the Squash returnless is released by spring.
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Old 12-21-2013, 03:16 PM   #14
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Quote:
Originally Posted by Iam Broke View Post
Ok, so LS9 cam looks good at 211/230 .558, .552 lift with a 122.5 CL, should idle great and give some gains. Lift is barely more than a stock LS3 (.551/.525) so do I need to worry about upgrading the springs at 8-9 psi? If so, any recommendations? I saw LS9 springs on the Lingenfelter site pretty reasonable.
Upgrade springs while you at it. Stock springs are junk.
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Old 12-21-2013, 03:58 PM   #15
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Quote:
Originally Posted by Iam Broke View Post
I did some calcs on what I could find with a 7.5 stock crank pully, not sure if 7.5 is correct though.

14,338 @ 6.5k rpm 3.4"
15,234 @ 6.5k rpm 3.2"

I see guys post that they are spinning over 22k rpm on a maggie. Wow! Some post that 16,500 is optimal. Same TVS2300 rotor pack on my SLP I believe. Lots to research, thanks for the input.

Yes, I have considered a BAP but it's only going to help a little bit, I have the voltage to the FP up to 15.5v in boost now in my HPT tune.

Also raised the pressure setpoint in boost (65 psi) using the ZL1 FP settings, but pressure tanked just as bad as leaving it flat at 58 psi.

I could also retune for 60% E but mixing 2:1 with 93 is kinda a pain even for a garage queen.

I have all winter so I hope the Squash returnless is released by spring.
Setting the volts to 15.5 I don't think helps much as there isn't 15.5 volts physically available without a BAP. Also, I wonder if a reprogrammed FPCM would help, I don't know your twin pump system so you would have to research this, or maybe you already have one?

I commend you for setting it up for ethanol.
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Old 12-21-2013, 04:15 PM   #16
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Actually with HPTuners you can raise the system voltage when in increased fuel flow. They do this stock on CTS-V's. I logged voltage when in boost and it does increase it to over 15 volts. See attached.

I did try the ADM FPCM that I had on the ZL-1 pump prior to this but it popped a FPCM code or two and Andy from ADM balled me out for trying it. I think this Livernois pump was too much for his module to drive. lol. I have the stock FPCM on it now. Sold the other combo.

I'm always messing with something.
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Old 12-21-2013, 05:15 PM   #17
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Wow. I didn't know our alternators were capable of over 15 volts without using a voltage booster.

If you boost up over 17 volts to the FPCM it will throw a code.
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Old 12-21-2013, 05:48 PM   #18
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Don't waste your money..You would gain more with our 102 TB for about half the price
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Old 12-21-2013, 06:15 PM   #19
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Wow. I didn't know our alternators were capable of over 15 volts without using a voltage booster.

If you boost up over 17 volts to the FPCM it will throw a code.
Ya, Ted told me that a while ago so I never tried a BAP. Figured another 1.5 volts would be pointless.
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Old 12-28-2013, 09:32 AM   #20
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Got a slightly used SLP 1.85 rocker kit coming pretty cheap to try, prob go with Comp dual springs good to .650 lift though instead of the SLP's that are good to .600". If I add an LS9 cam with those rockers it'll be 211/230 122.5 with ~.611 lift. Should idle near stock and have a modest power gain. Gotta be able to fool the Guv'nor.

Still fighting with myself about what to do.
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Old 12-28-2013, 09:47 AM   #21
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Why don't you guy's go to a return line setup? These cars have the same issue as the older single feed line cars. Pressure drop from the small single feed line that dead heads at the rail.
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Old 12-28-2013, 10:25 AM   #22
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I was avoiding the return system because of the extra labor involved running the line if I could get the fueling I need returnless. That and I'm clueless what all I'd need to switch over to a return style system. I looked at the Squash site and got more confused with all the options.
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Old 12-28-2013, 10:35 AM   #23
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Got a slightly used SLP 1.85 rocker kit coming pretty cheap to try, prob go with Comp dual springs good to .650 lift though instead of the SLP's that are good to .600". If I add an LS9 cam with those rockers it'll be 211/230 122.5 with ~.611 lift. Should idle near stock and have a modest power gain. Gotta be able to fool the Guv'nor.

Still fighting with myself about what to do.
I would like to see your gains from the 1.85 rockers. Are you planning to dyno it?
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Old 12-28-2013, 11:09 AM   #24
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I would love too if I could find a dyno closer than 100 miles away. Winter here now, mod time & storage.

I use HPTuner's scanner for real world gains. Best 60-100 so far is 3.72 sec in third, 3.8 sec avg. I'll go from there in the spring after all the salt is washed away.
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Old 01-03-2014, 02:20 PM   #25
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I had SLP do the rockers, valve springs on my Camaro. It was either that or a cam. I elected to go with the rocker set-up because I didn't want the front end of my engine messed with. Also kept original parts if I wanted to go back to stock. So I have the SLP supercharger with small pulley (9lbs of boost), 65lb. injectors, buster pump, SLP long tube header, full 3" X pipe exhaust and high flow mufflers and had the balancer pinned to crank. Roto-Fab CAI as well. When SLP was in Toms River NJ it was about 35 minute ride to the place. I had them do the work and do a dyno tune on the car when done. This was all before SLP was purchased and moved out of NJ. They did excellent work and I have no problems with the car at all. It can crank out the power when you put your foot into it.
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