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Old 05-09-2021, 07:58 PM   #15
NicKey
 
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We have found that 6th Gen fuel systems both low and high can have some variance so both need to be properly monitored. 700 rwhp and 640 tq “ish” will be approaching the fuel limits for sure, but remember that all Dynos do not read exactly the same. A 90mm pulley will yield approx 15 lbs of boost / restriction peaking at 16 as the 2650 keeps on going, with the larger snout, throttle body, CAI and no cats.


Here is a thread with data on the old Magnuson 2300 as well as a similar 2650.

https://www.camaro6.com/forums/showt...ghlight=NicKey

Last edited by NicKey; 05-09-2021 at 08:18 PM.
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Old 05-09-2021, 09:29 PM   #16
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Quote:
Originally Posted by JasonGofast View Post
Baseline

https://imgur.com/dCZexkF

After above mods


https://imgur.com/EJ6Dwt1

I will mention this is actually on a C7Z...

What type dyno is this if i may ask? And where did they pull 12lbs boost from? This with a 90mm pulley right? Because if it is, its not right.
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Last edited by Camaro1973; 05-09-2021 at 09:40 PM.
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Old 05-10-2021, 01:51 PM   #17
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Originally Posted by Camaro1973 View Post
What type dyno is this if i may ask? And where did they pull 12lbs boost from? This with a 90mm pulley right? Because if it is, its not right.
A mainline hub dyno. It's with the stock pulley that came with the 2650 which I assume is the 90mm. The top of the dyno sheet he gave me said 12 psi.

Would I even be able to run 15 psi with the stock fuel system? Maybe I should get it retuned, but it was done by a reputable one.
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Old 05-10-2021, 04:25 PM   #18
Corey7519
 
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Pretty much the same I have also - 92mm pully
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Old 05-10-2021, 04:52 PM   #19
Camaro1973

 
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Quote:
Originally Posted by JasonGofast View Post
A mainline hub dyno. It's with the stock pulley that came with the 2650 which I assume is the 90mm. The top of the dyno sheet he gave me said 12 psi.

Would I even be able to run 15 psi with the stock fuel system? Maybe I should get it retuned, but it was done by a reputable one.
You wouldn’t be reporting the numbers your showing with 12lbs of boost. Unless your rwhp is wrong and the torque is correct then 12 might make some sense.

These blowers with your setup will hit 16lbs with a 90mm pulley.

I had the same setup, friend and many others. All hitting 16. If it’s cold and very dry I was hitting even higher.

I was hitting about 215kpa total.

215 - 101 (standard atmosphere pressure) = 114/6.89 = 16.5psi


Edit: found some older logs when it was cold.
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928rwhp - 93 | 1040rwhp/898rwrq - E65 SAE

LME 377 LT4 Short Block | Magnuson 2650 80mm upper w/13% lower (9.06) | DSX Lid & Valve Covers | CSP Custom Cam w/32% fuel lobe | CID Heads | NW 103mm TB | Roto Fab Big Gulp | CSP 2" Headers w/Green GESI Gen 2 Cats | Borla 3" Full Cat Back w/ S-Type| Mighty Mouse Wild Catch Can| Custom Holley Low side Fuel system| TooHigh PSI Port Injection w/Holley Controller | Forced Inductions Interchiller w/2 gallon fender tank | TK Performance built 10L90
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Old 05-17-2021, 02:02 PM   #20
radz28
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Quote:
Originally Posted by Camaro1973 View Post
You wouldn’t be reporting the numbers your showing with 12lbs of boost. Unless your rwhp is wrong and the torque is correct then 12 might make some sense.

These blowers with your setup will hit 16lbs with a 90mm pulley.

I had the same setup, friend and many others. All hitting 16. If it’s cold and very dry I was hitting even higher.

I was hitting about 215kpa total.

215 - 101 (standard atmosphere pressure) = 114/6.89 = 16.5psi


Edit: found some older logs when it was cold.
I experienced a lot of these, too, with a similar set-up. With no mechanical changes, and only change in weather, I can see a pretty consistant 15-psi in 80* ambient to closer to 16-plus in the 60*s and good DA (I'm at sea level). I've seen spikes as high as 19 in really cold air, but I'm also running mostly stock exhaust, so that's not surprising.
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