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Old 02-06-2020, 10:56 AM   #29
radz28
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Looks to me like the 90mm is too large of pulley for the 2650...it's being under driven. You will likely have to shift around 7-7200rpm to stay up in good power.
Yeah. Unless it has been changed since the install, that was the CARB-intent kit, which comes with the 90mm pulley. Still - I believe Magnuson said it was right about 14-psi. It sounds like those blowers like closer to 20-or-so, from what I hear and see on the all-truthful interwebs.
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Old 02-06-2020, 09:13 PM   #30
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The all-truthful interwebs... Yes, the 90mm pulley is for CARB purposes and itís still on. Adding some go fast parts this week and then retuning with Ted. Iím going to wait until I can add fuel before going to a smaller pulley.
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Old 02-07-2020, 08:42 AM   #31
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The all-truthful interwebs... Yes, the 90mm pulley is for CARB purposes and itís still on. Adding some go fast parts this week and then retuning with Ted. Iím going to wait until I can add fuel before going to a smaller pulley.
I'm really eager to see how this round of mods' works out because this was the direction I was planning on going.
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Old 02-07-2020, 08:47 AM   #32
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I'm really eager to see how this round of mods' works out because this was the direction I was planning on going.
Be glad to Help you with your project.

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Old 02-07-2020, 09:03 PM   #33
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Yes, I was at 640.7 with one modification - the 2650. Stock everything else and a 90mm pulley.
How much would LTs and a Big Gulp help this setup? Or is it an unnecessary expense at this point?
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Old 02-07-2020, 10:22 PM   #34
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That’s exactly what’s going on. Kooks, BG, 95mm tb and the JMS fuel pump booster. I’m having it remote tuned by Ted J so I will not get dyno numbers this time. This round was not necessary, and I’m not necessarily looking for a particular hp number, just wanted the sound of the headers and Rotofab. The next round will definitely be for more power, but that means a cam, injectors, low and high side fuel pumps and a flex fuel sensor.
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Old 02-08-2020, 02:11 AM   #35
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Thatís exactly whatís going on. Kooks, BG, 95mm tb and the JMS fuel pump booster. Iím having it remote tuned by Ted J so I will not get dyno numbers this time. This round was not necessary, and Iím not necessarily looking for a particular hp number, just wanted the sound of the headers and Rotofab. The next round will definitely be for more power, but that means a cam, injectors, low and high side fuel pumps and a flex fuel sensor.
I would think that setup should get you around 700 give or take. I'll be looking to have mine remote tuned as well. But once it is dialed in I'll be going to a shop to get it dynoed to see what the final numbers come out to be. If I get 650-700 then it'll be well worth it. Especially as a first round of mods since I'll be doing more extensive mods down the road.
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Old 02-08-2020, 05:34 AM   #36
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We have done several 2650 swaps on ZL1's in the past month with similar supporting mods to you, plus headers, 85mm/stock lower and 90mm/5% lower pulley combinations. We see about 750 rwhp through a 10 speed auto at 16 psi, 6600 rpm on 93. You'll be 14-15 lbs at 6500 rpm, 16 psi if you take it to 6800 with that pulley combination. It should make an easy 700 rwhp on 93. The 2650 makes WAY less heat than the stock blower. Even at 15 psi you'll be 30-40 degrees cooler than the stock blower at 9-10 psi. You will loose some torque below 3000 rpm because of the way it ramps boost in. By 4500 though it will be up at least a 100 lb/ft over stock. I think it makes these cars way easier to drive on track. I can post up some dyno sheets when I get back to the shop on Monday if you're interested.

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Old 02-08-2020, 06:17 AM   #37
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Thanks Matt for the input. You guys do a great job at Nickey and build some pretty bad ass rides for sure.
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Old 02-08-2020, 02:14 PM   #38
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Originally Posted by NickeyMatt1LE View Post
We have done several 2650 swaps on ZL1's in the past month with similar supporting mods to you, plus headers, 85mm/stock lower and 90mm/5% lower pulley combinations. We see about 750 rwhp through a 10 speed auto at 16 psi, 6600 rpm on 93. You'll be 14-15 lbs at 6500 rpm, 16 psi if you take it to 6800 with that pulley combination. It should make an easy 700 rwhp on 93. The 2650 makes WAY less heat than the stock blower. Even at 15 psi you'll be 30-40 degrees cooler than the stock blower at 9-10 psi. You will loose some torque below 3000 rpm because of the way it ramps boost in. By 4500 though it will be up at least a 100 lb/ft over stock. I think it makes these cars way easier to drive on track. I can post up some dyno sheets when I get back to the shop on Monday if you're interested.
Thanks for the info. I have a question if you don't mind my asking. I trust you guys know your stuff. Is it safe at that psi and up to 6800 RPMs? Are you sending them out the shop for DD use at those boost/HP/RPM levels or are you dialing it back a bit. Those numbers look really good to me and if I can get there this way then that might be all I need.

Sorry to hijack the post OP.
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Old 02-08-2020, 03:21 PM   #39
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Thanks for the info. I have a question if you don't mind my asking. I trust you guys know your stuff. Is it safe at that psi and up to 6800 RPMs? Are you sending them out the shop for DD use at those boost/HP/RPM levels or are you dialing it back a bit. Those numbers look really good to me and if I can get there this way then that might be all I need.

Sorry to hijack the post OP.
I spin mine 6800 on the road coarse every lap i see no issues with doing this.

16 psi boost might be a bit much for 93 octane pump gas, for the road coarse.

For the road coarse I would like to see closer 13-14 ish in limited to 93.

On good fuel I would have no issue running it at 16-17 psi.
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Old 02-08-2020, 10:02 PM   #40
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For road race use I would keep it below 15 psi like Ted said. 6800 rpm is no problem. For street and drag use we do send them out the door at 16 psi though. We had a shop ZL1 we did testing with and had no problems with those power, boost, and rpm levels for street use on 93 octane. That package on a pump/race gas mix we've pushed to 17 psi and 6900-7000 rpm. That will do 830 whp and high 9's on a drag radial in a full weight car. The 2650 really allows you to be little more aggressive with theses lt4's with proper tuning. So dialed back to around 700 whp will be a reliable road course setup.
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Old 02-09-2020, 07:05 AM   #41
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What they said.
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Old 02-09-2020, 08:18 AM   #42
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I spin mine 6800 on the road coarse every lap i see no issues with doing this.

16 psi boost might be a bit much for 93 octane pump gas, for the road coarse.

For the road coarse I would like to see closer 13-14 ish in limited to 93.

On good fuel I would have no issue running it at 16-17 psi.
Are you still running the stock blower on your ZLE, Ted?
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