Shortbus

then i guess my **** should have been blown up.

ebristol

iTrader: (4)

Thats a good point.

WunSick

heh i wanna see what happens here, hes gunna need 60s.... subscribed

an0malous

its a possibility that he has limited boost in all gears to avoid going above 100% IDC, but to do that, your talking about a pretty major drop after 5500rpm, which is where a 2.7 will start to max out the injector.

can you say reverse-Vtech! lol

not to mention your still creating all that extra heat, and not using the boost its being created for.

all this to avoid buying some 60s?
strange logic.

Shortbus

Lol why try explaining things on thise site anymore.

an0malous

lol yeah i hear ya.
they are just gonna do whatever they want anyway.

JMHZ2401

Not really. When you run a injector above 90% IDC it is more likely to fail. This does not mean it will, but the chances are more likely. It is like a playing with a ticking bomb. When the fix is really easy (bigger injectors) to me it seems dumb not to fix the issue.

Shortbus

mine were 122% at 5k rpms.....

FryLoch

iTrader: (5)

Yea, that has got to be one hell of a tune to run a 2.7 with 42's. Good Luck man!

Area47

if you saw the real numbers of the 42 lbers, you would understand.



the saying, been there done that. applies to this.

distillion

if this shop knows cobalts.
theyd throw 60s in and tune for them.
a 2.7 on 42s is ridiculous....

Shortbus

its like playing with fire knowing your going to get burned but doing anyway.

ludicristSS

The Fact the to many WEB tuners rely on IDC from a scanner they got free with there tuning software. Look at MS on the injectors 22.4 is static but HPT will show 100% at 17.8 MS . They don't conincide . I do how ever feel more comfortable with the 42's from http://www.cobaltperformanceparts.com/ Then the GM 42's . IMO . But everyone here on the boards knows how to tune we just guess at it . Here is the bottom line 42lbs x 2 =84 x4 = 336 crank hp The math is still the math. Most I have seen from a eaton 2.0lsj on my dyno is 245 x 15% 281 hp . How are we going to get the extra 55hp the injectors will allow ? Not ment to you personally but if people are running very rich I.E. in the low 10's-High 9's [ alot of you are ] and adding timing to compensate for lack of hp then you might max out the injector.Also it's better to run a little leaner with less timing then rich with more .

You car was to rich and you need to look at the ms on the scan.

11.8 af at the tailpipe [ reads leaner then accual] He will not need 60lbs .

We can and do . What do you think we run in our 10 second vettes/trailblazer SS's ? 42's ?

WTF are you nuts running 32 degrees of timing ? I would go and blaming anything on the injectors if I where you .

rickay726

thank you matt! oh and my IDC is 78-82%

SSCobalt~SSZ24

this is entertaining lol

chevysalesman614

is he seeing the full amount of cfm the 2.7 is capable of, or did you bleed boost up top via the bypass valve?

also, why do the numbers seem so low? i would hope my cobalt would've made 260+ had i put on a 2.7.
are you saying there is no room for more power (with his current mods) with 60lb/hr injectors?

Edubs

HA HA HA HA...

Matt, it's about time you came on here and shut people up.

I'm dissappointed. Someone comes on here and talks about how some freakin' carnival worker told him that Matt can't tune and you go running w/ it like it's the bible.

People need to understand that Matt knows how to tune and it's been proved over and over. There are plenty of TTP tuned SS/SC's running around NE and none of them blew up due to tuner error. I drive three hours to get tuned for a freakin' reason...

chevysalesman614

my issue is with the weak numbers, not the safety of the tune.

didnt matt tune dtm's car for 60s and a 2.6?(menaing he can tune for 60s if he needs to)

mine never blew up, and i beat the **** out of it actually, so did the guys who stole it
i dont know of any tune time cobalts that blew up for any reason. is there one?

yeah, once i get my monies in order, i'll be going to matt again to get my cobra tuned for a smaller pulley. (but i'm still learning whats safe as far as not grenading my new heaton)

ludicristSS

What kind of dyno . Yes he is seeing 18 psi total . His car did good on my mustang dyno . [ it will generally read 10-12% less then a dyno jet .]

Edubs

Before you go running around telling people what you think you heard...

There were issues tuning 60's on one particular, turbo swapped, Cobalt because of limitations in HPT. That guy either doesn't know what he is talking about or you weren't listening.

ludicristSS

Bring it . I love that mod motor .

chevysalesman614

your mustang dyno. u tuned my car. i made 245/214 2.9, 42, a catback, and intake.
have you changed the calibration?? or was it beacuase the dyno had been recently greased when i was there?

Edubs

Dan's (DTM) car was tuned and dyno'd at like 276 or something, but that was on a dynojet that Matt borrowed before he bought his Mustang dyno. At one point, we had my car w/ 60's in it, and it ran and idled better than stock. They were just too freakin' big for my car only making 280whp. BTW, I'm pretty sure mine is the car he's talking about making the 245 on his dyno...

chevysalesman614

i plan to, once the funds are scraped together.

Avrj123

Interesting post, and looking forward to getting my car tuned soon with a 2.7 pully and 60lb injectors, but im hoping to get more whp than 237, I see a lot of cars on here with stage 2 and intake making more whp, and thas boosting only like 14-15lbs boost on a good day.