Anyone with a 2.9!!!!

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Jun 7, 2012 | 12:12 AM

CelphTitled

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From: San Diego

Anyone with a 2.9!!!!

Is anyone running a 2.9 on a stage 2 tune with 91 octane?????? I want to put my pulley on but people tell me different things. OR.... If you know it it safe for me to run a 2.9 on my 2006 cobalt ss with 49lbs, GM stage 2 tune header back all 3".????????

Please help me out... im going crazy with this pulley thing!!!

Jun 7, 2012 | 12:24 AM

Vander Nars

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From: Augusta GA

Well im guesing u meant u have 42 injectors because gm stage 2 tune is made for 42 injectors not 49.

Jun 7, 2012 | 12:25 AM

CelphTitled

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From: San Diego

hahhahahahahah Yes 42s my bad.

Jun 7, 2012 | 07:21 AM

Staged07SS

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From: NEPA

You will be fine.

Jun 7, 2012 | 08:54 AM

insylem

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From: Wisconsin

I ran a 2.85 on 42s for a while and I was fine.
Though I upgraded to 60s just tobe safe

Jun 7, 2012 | 09:40 AM

ItalianJoe1

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From: Miami, FL

This has been covered a million times before...

You can run a 2.8 on 42lb injectors, depending on how high you rev they will run out of capacity, usually around 6800 or so they peg at 100%.

Jun 7, 2012 | 09:50 AM

mrbelvedere

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From: KY

Quote:

Originally Posted by CelphTitled

this has been covered a million times use the search button or google it

Quote:

Originally Posted by ItalianJoe1

This has been covered a million times before...

You can run a 2.8 on 42lb injectors, depending on how high you rev they will run out of capacity, usually around 6800 or so they peg at 100%.

make that a million and 1

Jun 9, 2012 | 12:43 PM

CelphTitled

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From: San Diego

do you guys have 91 octane or higher????????

Jun 9, 2012 | 01:59 PM

bluebalt07

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From: Ohio

You will be fine with 91 octane

Jun 9, 2012 | 02:03 PM

#10

05Slowline

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From: HBG/Hanover

Lol. If you're not going to pony up to do it right then don't do it IMO.
This is a 3.0 42's and custom tune and you can see that it ran way out of injector...

Jun 9, 2012 | 02:05 PM

#11

nhanson

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From: Minnesota

Tune for 91...will be easier to find than 93

Jun 11, 2012 | 07:01 PM

#12

ULWizSS

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From: Florence, NJ

Quote:

Originally Posted by 05Slowline

Lol. If you're not going to pony up to do it right then don't do it IMO.
This is a 3.0 42's and custom tune and you can see that it ran way out of injector...

Why at almost 12.70 AFR?

Jun 11, 2012 | 07:21 PM

#13

05Slowline

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From: HBG/Hanover

ran out of injector lol, you can see commanded was way rich so this is what lead to it and was just one in a number of flashes thereafter, i think idcs were just below 100 when it was done but this is on a 3.0 and people thinking it's ok to run lower with a gms2 tune are delirious imo. granted you will have more or less inj depending on altitude as in CO you can run a 2.8 and 42's and be fine, but i don't see the point in putting a smaller pulley on if you can't afford a 2-300 dollar tune to make sure it's safe.

Jun 11, 2012 | 07:29 PM

#14

05Slowline

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From: HBG/Hanover

AFR was ok until idc's got to about 109 and started going static

Jun 11, 2012 | 08:02 PM

#15

ULWizSS

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From: Florence, NJ

I see it now, Sorry not thinking straight. Little Jet lagged from the Bahamas this weekend.

Jun 11, 2012 | 08:27 PM

#16

07MetallicSC

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From: Land of Freedom

Curious why 3" exhaust

Jun 11, 2012 | 08:39 PM

#17

05Slowline

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From: HBG/Hanover

Quote:

Originally Posted by 07MetallicSC

Curious why 3" exhaust

bcz so much powa....and wtf are 49# injectors lol

Jun 12, 2012 | 10:09 AM

#18

ebristol

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From: WI

05slowline is right. I would never run anything lower then a 3.1" pulley on GMS2 injectors.

I maxed them right at 7k with a custom tune.

Stock Injectors Stock Pulley Stock Tune and all the bolt-ons - Saturn ION RedLine Forums

Quote:

Originally Posted by GMRedline

42s / 3.07" / Stock GMS2 Tune

Tune is from an 07 ION Redline

PE Fuel Multiplier vs RPM Table

I am not sure what the thought process behind this is...

It takes quite a while for the AFR to drop to a safe level. Before 4562 rpms the AFR was in the mid 12s.

100% IDC at 5841 and the lowest AFR of 10.7.

120% IDC and 11.8 AFR at 6626.

I wanted to rev to 7000 but I saw the lean spike and let off. I have a little more faith in this setup compared to the stock setup. I "think" that I can keep the IDC under 100% all the way to 7k with a custom tune that has the proper AFR. But its going to be close.

It will be really interesting to see what the 2.8" and 2.9" pulley does with these injectors.

Quote:

Originally Posted by GMRedline

42s / 3.07" / Custom Tune

11.76 Flat Commanded AFR, 22 degrees of timing.

Of course the OP already heard the answer he wanted to hear so he is probably going to do it.

Jun 12, 2012 | 10:16 AM

#19

YelCal7

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From: Moon

That's why I am upgrading my fuel injectors from 42lbs to 60lbs. I am on 2.9 pulley right now with 42lbs and I can tell it's stall/fuel cut off alittle bit only on the second gear. If I am pushing it.

Jun 12, 2012 | 11:03 AM

#20

sujomatt

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From: Hartford CT

I had no issues with a 3.0 on 42s. I would be cautious running them wiht anything lower. I am going to be running a 2.8 and upgraded to 60s

Jun 12, 2012 | 12:55 PM

#21

07MetallicSC

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From: Land of Freedom

i maxed out my 42# injectors on a 2.9 after 5,500 rpms
that was back in the day too

Jun 12, 2012 | 11:39 PM

#22

CelphTitled

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From: San Diego

ok guys thanks a lot! u might have saved my car hahah

Jun 13, 2012 | 12:03 PM

#23

Littlegoose

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From: Charleston, SC

I have logs somewhere of my 2.9 with 42s at over 120% duty cycle as well. Depending on your mod level and what you're revving to, I'd be very careful and recommend 60's.

Jun 14, 2012 | 10:01 PM

#24

robd53

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I'm on a 2.9 and running 60's, for whatever it's worth.

Jun 15, 2012 | 01:15 AM

#25

insylem

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From: Wisconsin

Check this artical out by ZZP I think it should awnser your questions.

ZZP News | Go Fast... Not Broke | 3800 | Ecotec | Sonic/Cruze

And for what it's worth, I'm running a 2.85" (seems to be an oddball size) on 60s

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