Boost lvl for a 2650R / 90mm Pulley / OEM Lower / 103mm TB / 2" Longtubes

FoundNemo · 07-18-2021, 09:43 AM

Just curious, what boost level are folks seeing with a 90mm pullied 2650R on an OEM lower pulley, Rotofab intake, 103mm TB, 103mm blower snout, 2" longtubes and all otherwise stock setup?

Camaro1973 · 07-18-2021, 11:17 AM

Quote:

Originally Posted by FoundNemo

Just curious, what boost level are folks seeing with a 90mm pullied 2650R on an OEM lower pulley, Rotofab intake, 103mm TB, 103mm blower snout, 2" longtubes and all otherwise stock setup?

16psi +

IneedAZ · 07-18-2021, 11:39 AM

Mine is 16 but with the ATI 14% lower

Camaro1973 · 07-18-2021, 12:09 PM

Quote:

Originally Posted by IneedAZ

Mine is 16 but with the ATI 14% lower

You have a cam. Technically you should be lower, unless 16psi is when its cold.

Camaro1973 · 07-18-2021, 12:16 PM

This is the 2650, 90mm, headers, green cats, 103mm intake, cat back, roto fab.

Cold weather 16.6 psi.

FoundNemo · 07-18-2021, 12:23 PM

Looks like my buddy will be going with a 95 or 100mm pulley to keep it totally safe for fueling limits then. Thanks.

IneedAZ · 07-18-2021, 12:58 PM

Quote:

Originally Posted by Camaro1973

You have a cam. Technically you should be lower, unless 16psi is when its cold.

My components are in the sig

Camaro1973 · 07-18-2021, 02:52 PM

Quote:

Originally Posted by IneedAZ

My components are in the sig

Yes but hes asking what the boost is with stock engine, no internals.

Camaro1973 · 07-18-2021, 02:57 PM

Quote:

Originally Posted by FoundNemo

Looks like my buddy will be going with a 95 or 100mm pulley to keep it totally safe for fueling limits then. Thanks.

Stock 90mm is fine, he will be close/right at limits. If hes in an area that doesn't have 93 may need to reduce timing rather then otherwise. A 95mm will work too. A 100mm probably isn't worth putting on as you'll be losing 3-4psi of boost.

I think i made like 660/665 or something on the 90mm @ 17degrees of timing up top.

PureZL1 · 07-20-2021, 12:23 AM

I hit 13 psi with a 90mm upper, oem lower and stock tb, stock snout also 14 on 85mm with the same build, seems like i am very different than everyone else but its happening for me.

Camaro1973 · 07-20-2021, 12:35 AM

Quote:

Originally Posted by PureZL1

I hit 13 psi with a 90mm upper, oem lower and stock tb, stock snout also 14 on 85mm with the same build, seems like i am very different than everyone else but its happening for me.

Ya that's odd. do you have any data logs?

laynlo15 · 07-20-2021, 09:45 AM

Stock lower should be at about 13-14 depending on elevation

Camaro1973 · 07-20-2021, 02:21 PM

Quote:

Originally Posted by laynlo15

Stock lower should be at about 13-14 depending on elevation

That definitely isn’t right. You can see many posts from other tuners all over where the 90mm, stock lower are all hitting 16psi. (Sea level) my log as well.

PureZL1 · 07-20-2021, 04:23 PM

Unfortunately i don’t, i am setting up a new build with a cam and 9.17 lower hope it goes well.

07-18-2021, 09:43 AM	#1
FoundNemo Drives: 2019 ZL1 Join Date: Oct 2019 Location: GA Posts: 573	Boost lvl for a 2650R / 90mm Pulley / OEM Lower / 103mm TB / 2" Longtubes Just curious, what boost level are folks seeing with a 90mm pullied 2650R on an OEM lower pulley, Rotofab intake, 103mm TB, 103mm blower snout, 2" longtubes and all otherwise stock setup?

07-18-2021, 11:39 AM	#3
IneedAZ Drives: 2017 ZL1 A10 & 2021 BMW M340i x Dr Join Date: Mar 2009 Location: Tampa Posts: 5,110 View My Garage	Mine is 16 but with the ATI 14% lower __________________ Sold 2012 2LT RS 12.3@112 old setup Sold 1967 Camaro Pro Street. Ran 10's mild BB on NOS. 2017 HyperBlue ZL1 A10 Born 3/17/17Delivered 4/08/17 2020 Build: Mag2650, BTR Stage2, NW103, BG, 14% lower, 90mm upper, ARH 2" Long system w/no cats, SW Legend mufflers. 807hp/762tq on 93 gas and 848hp/792tq on e47 Sold 2018 (Go Mango) Dodge Charger Daytona 392 Daily Driver Daily Driver 2021 BMW M340i Xdrive

07-18-2021, 12:16 PM	#5
Camaro1973 Drives: 2019 ZL1 Join Date: Mar 2019 Location: NJ Posts: 1,534	This is the 2650, 90mm, headers, green cats, 103mm intake, cat back, roto fab. Cold weather 16.6 psi. Attached Images __________________ 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

07-20-2021, 09:45 AM	#12
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	Stock lower should be at about 13-14 depending on elevation __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

07-18-2021, 12:23 PM	#6
FoundNemo Drives: 2019 ZL1 Join Date: Oct 2019 Location: GA Posts: 573	Looks like my buddy will be going with a 95 or 100mm pulley to keep it totally safe for fueling limits then. Thanks.

07-20-2021, 12:23 AM	#10
PureZL1 Drives: 2018 A10 ZL1 Join Date: Oct 2020 Location: Kuwait Posts: 21	I hit 13 psi with a 90mm upper, oem lower and stock tb, stock snout also 14 on 85mm with the same build, seems like i am very different than everyone else but its happening for me.

07-20-2021, 04:23 PM	#14
PureZL1 Drives: 2018 A10 ZL1 Join Date: Oct 2020 Location: Kuwait Posts: 21	Unfortunately i don’t, i am setting up a new build with a cam and 9.17 lower hope it goes well.

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