[JSH]

Originally Posted by ZL1Atlanta

It’ll come down to goals, keeping in mind that a SBE is generally good to about ~1,050 RWHP on a PD blower before you need to start worrying about powdered forged rods and bearings. With a ported 2650 you’ll start getting there at around 18-20k RPM, depending on engine efficiency with head work. I would get an upper/lower pulley combo that gets you in that blower RPM range at 7k RPM.

Goals? Nines up here with a car that still behaves reasonably well on the road. I know my forged short block will handle 1000+, but the build you see in my sig won't make that much actual uncorrected hp up here. At least I don't think it will.

I have yet to measure my 10% lower pulley but I'm assuming for now the OEM is 7.87" so 10% should be 8.66/3"x7000 = 20,200rpm. Greg likes this number.

On the other hand, this WeaponX table shows 8" OEM. Either way, the rpm won't vary much. https://www.camaro6.com/forums/showthread.php?t=521860

[ZL1Atlanta]

Originally Posted by JSH

Goals? Nines up here with a car that still behaves reasonably well on the road. I know my forged short block will handle 1000+, but the build you see in my sig won't make that much actual uncorrected hp up here. At least I don't think it will.

I have yet to measure my 10% lower pulley but I'm assuming for now the OEM is 7.87" so 10% should be 8.66/3"x7000 = 20,200rpm. Greg likes this number.

On the other hand, this WeaponX table shows 8" OEM. Either way, the rpm won't vary much. https://www.camaro6.com/forums/showthread.php?t=521860

Sounds like a good combo for what you're trying to do!

[JSH]

Originally Posted by EDFHOBBIES

I would say stock is 7.5 to 7.8 the ZR1 is 8.07

Actually mine is 8.25 inches

Jeez. I had concluded OEM is 2.5" upper and either 7.87 or 8" lower.

[EDFHOBBIES]

So I'm sitting pretty good at 8.3 and 3.0 at 1000 plus? Yes? No maggy has posted that high of a power level with those combos. Ive seen some 10 inch lowers and 3.0 inch uppers! I admit I have a terrible approach bringing info but it really made me mad how these maggy sponsors and Mike made claims about the competition that simply weren't true. Also i didnt appreciate the lying about the 2650 release date and then being pushed a POS 2300 instead. I also pointed out a lot stuff they had in bullets on the their web page and now those claims are gone. I never ever saw them with an edelbrock 2650 performing the same tests as they did on mikes vette all they had were numbers. And when I simply swapped blowers not at where I'm sitting today of course his number were way off just like his advertised gains on his vette. People are not getting the same results as him, you've seen the threads in the zl1 section I'm sure . I had nothing to do with them instead there brushed over from out of whack dynos and tuners. I'll admit it I'm a big baby when I know im right and they put me down for proving my point I won't ever let that go.

Really I could careless I know what I have done and the money I spent was way cheaper. I went out and did it myself I didn't have to listen to someone hype it up and be like a sheep following someone off a cliff with out thinking about things. I have a solid build fixing to hit 3 years. I know edelbrock isn't as prestigious as a maggy mainly from the bad hype the ls 2300 got and it was spot on it sux azz. This allowed maggy and other shops to make claims with out presenting equal testing and just going on hypothesis and hearsay much like csp did when they had all the blowers sitting in the table. RPM, Fran makes plenty of power with them has good iats and says he likes them and he also says the ls2300 version a piece of $#%^.

Anyhow I'm running 10/12 above ambient on my iat 2 and about 24 degrees above ambient on maf air temp no matter the outside temp..

Toohighpsi or Shizzy made a post that I would need a chiller to have as good as iats as the maggi so I bought one.. I ended up getting rid of it cuz I didn't need it. It just proves how wrong they were about the competition.

Anyhow it's all good they are all good blowers but that's not how the competition presented both 2650 so I added my own findings. Probably went about it the wrong way but who cares no one pays me to conduct myself in a certain manner and I don't care what people think of me.

[JSH]

Originally Posted by EDFHOBBIES

So I'm sitting pretty good at 8.3 and 3.0 at 1000 plus? Yes?

At 8.87/3" I'll be 20600-ish. Is yours the same Kong TVS2650 that I bought?

[EDFHOBBIES]

Originally Posted by JSH

At 8.87/3" I'll be 20600-ish. Is yours the same Kong TVS2650 that I bought?

I think mine is ported more actually atleast compared to what my friends was that I saw 2 weeks ago. I'm just going off of visual looking down the snout of course. Mine was done by hand so he could scan it to software to cnc the rest.

[JSH]

Originally Posted by EDFHOBBIES

I think mine is ported more actually atleast compared to what my friends was that I saw 2 weeks ago. I'm just going off of visual looking down the snout of course. Mine was done by hand so he could scan it to software to cnc the rest.

The bosses for future port injection also added to this SC's appeal.

[ZL1Atlanta]

Originally Posted by JSH

The bosses for future port injection also added to this SC's appeal.

I went back and looked at all of the pulley combos I’ve had trying to find one that got blower RPM to what you’re aiming for. When I first got the 2650 I had a 3.15/9.17 combo, so roughly ~20k RPM. We were shifting around 6800 at the time. It made 994 RWHP on an off the shelf 2650 (no porting) through an A10. This was prior to having a port injection option so it was on C16. Would have made a little more on ethanol.

[EDFHOBBIES]

Originally Posted by ZL1Atlanta

I went back and looked at all of the pulley combos I’ve had trying to find one that got blower RPM to what you’re aiming for. When I first got the 2650 I had a 3.15/9.17 combo, so roughly ~20k RPM. We were shifting around 6800 at the time. It made 994 RWHP on an off the shelf 2650 (no porting) through an A10. This was prior to having a port injection option so it was on C16. Would have made a little more on ethanol.

It's stated that all come with stage 2 porting in mikes video. No there are no cnc marks visible in the housings they are more open for sure. When I did my build the edelbrock was 4800 to 5200 at summit with that 500 rebate considered. Kongs porting was 700 for me since I was the 1st. Now it's 1200 something. This was one of my main points it was cheaper and better once ported especially with $400 112 snout. Still came in cheaper than the maggy. You must have a good setup cuz it took janetty with an all DI set up to pass me with a 10 inch lower.

[ZL1Atlanta]

Originally Posted by EDFHOBBIES

It's stated that all come with stage 2 porting in mikes video. No there are no cnc marks visible in the housings they are more open for sure. When I did my build the edelbrock was 4800 to 5200 at summit with that 500 rebate considered. Kongs porting was 700 for me since I was the 1st. Now it's 1200 something. This was one of my main points it was cheaper and better once ported especially with 400 112 snout. Still came in cheaper than the maggy. You must have a good setup cuz it took janetty with an all DI set up to pass me with a 10 inch lower.

Yeah, I know they say that, but there are aftermarket porting options now with proven back to back results - both with dyno HP and in manifold pressure. Magnuson sent me an in house "stage 3" ported housing that I haven't tried yet, but they said to expect some loss down low but gains up top. Saw something similar with the Kong porting I have now.

No idea what they did, but every combo the car has had has a trap speed with a race weight to show that it aligns very closely to the dyno, if not showing a little more. I think "better" is subjective at this point considering Tim King in his C7 was the quickest and fastest Edelbrock 2650 for LT's I've seen and I'm already matching his trap speeds with a heavier car, and just added a couple hundred more RWHP (and dropped weight)..

[JSH]

Originally Posted by ZL1Atlanta

I went back and looked at all of the pulley combos I’ve had trying to find one that got blower RPM to what you’re aiming for. When I first got the 2650 I had a 3.15/9.17 combo, so roughly ~20k RPM. We were shifting around 6800 at the time. It made 994 RWHP on an off the shelf 2650 (no porting) through an A10. This was prior to having a port injection option so it was on C16. Would have made a little more on ethanol.

Interesting. Right now, I'm at 3"/8.87" = 2.956, and you're at 2.91. I've kicked this topic around with Kong and KaTech too, and used 7,000/20,700 rpm in my math, and they both agreed. Using 6800, I get 18,133 which is fine too. KaTech said they typically spin the blower between 18,000 and 19,000rpm @ 7,000rpm engine speed. I've mainly raced big cid (500-742) high HP carbureted engines up here, and I believe I need to try to rev to 7k. We'll see.

[ZL1Atlanta]

Originally Posted by JSH

Interesting. Right now, I'm at 3"/8.87" = 2.956, and you're at 2.91. I've kicked this topic around with Kong and KaTech too, and used 7,000/20,700 rpm in my math, and they both agreed. Using 6800, I get 18,133 which is fine too. KaTech said they typically spin the blower between 18,000 and 19,000rpm @ 7,000rpm engine speed. I've mainly raced big cid (500-742) high HP carbureted engines up here, and I believe I need to try to rev to 7k. We'll see.

I can’t speak to the Kong 2650 having not owned one, but the additional porting on the Maggie really needs a lot more RPM to be effective (22k+). Up to that point the gains seem to be minimal over the standard stage 2 port that comes with them.

[JSH]

Originally Posted by ZL1Atlanta

I can’t speak to the Kong 2650 having not owned one, but the additional porting on the Maggie really needs a lot more RPM to be effective (22k+). Up to that point the gains seem to be minimal over the standard stage 2 port that comes with them.

He said 20k would be a good "starting point", so, yea, 22k works.

BTW, hypothetically, let's say you were to do a half dozen races this season in Georgia. How often would you adjust your ECM/TCM tunes?

[toohighpsi]

Originally Posted by EDFHOBBIES

So I'm sitting pretty good at 8.3 and 3.0 at 1000 plus? Yes? No maggy has posted that high of a power level with those combos. Ive seen some 10 inch lowers and 3.0 inch uppers! I admit I have a terrible approach bringing info but it really made me mad how these maggy sponsors and Mike made claims about the competition that simply weren't true. Also i didnt appreciate the lying about the 2650 release date and then being pushed a POS 2300 instead. I also pointed out a lot stuff they had in bullets on the their web page and now those claims are gone. I never ever saw them with an edelbrock 2650 performing the same tests as they did on mikes vette all they had were numbers. And when I simply swapped blowers not at where I'm sitting today of course his number were way off just like his advertised gains on his vette. People are not getting the same results as him, you've seen the threads in the zl1 section I'm sure . I had nothing to do with them instead there brushed over from out of whack dynos and tuners. I'll admit it I'm a big baby when I know im right and they put me down for proving my point I won't ever let that go.

Everything that was claimed or published was backed up with testing, Magnuson had a verified SAE J1723 Supercharger Performance stand in which competitor SC were tested and compared for both SC and Intercooler performance. I'm sorry, but as delivered the Edelbrock is a rather poor performing unit. It's SC inlet was too restrictive causing poor Volumetric Efficiency and it intercooler had low pressure drop (good) but poor effectiveness (bad) due to a low fin count in the reasonable sized intercooler core.

I'm sure I wouldn't recommend an interchiller (not a fan), but everything from my C7 Z06 is accurate. Many people tend to forget that I had an LT Engine on the Engine Dyno at Magnuson running tests and developing an understanding for LT tuning parameters since 2014. There isn't a calibration value inside that engine from Cam Timing to SOI that I didn't understand and optimized for the combination on my cars. Please don't think for a minute that you're going to throw a 2650 on your car, tune it yourself and expect the same results in an afternoon. Even the 700+ HP pulls on pump gas were the result of upwards of 50-60 chassis dyno pulls after extensive engine dyno pulls to hit that WOT tune. I wasn't limited on dyno time, resources, or education relating to the LT engine to optimize the system. Just because you can't do it doesn't mean it can't be done, you just might not have worked at it as hard or had the resources that I had...