Blown 4-banger

I have the stock pulley and injectors, with hp tuners could I richen the car up and raise the rev limiter to 7k without running too lean? Basically I just want a more agressive timing curve (to use race fuel) and the raised rev limiter.

Blown 4-banger

Bump

Blown 4-banger

Oh come on! Are you serious!?!? What The Eff!!!
B-U-M-P

-Jayson-

Bump

Blown 4-banger

thank you, I can use all the bumps I can get!

NJHK

No one probably answered you cause you answered your own question...

If you're going to richen up the motor, you're not going to run lean. With HP Tuners you can basically do anything you want.

If you're worried about your stock injectors and if they'll be pushed to the limit, no they shouldn't be.

Just remember, with HP Tuners you have control and view over everything. If you're afraid your injectors are going to reach close to 100% duty cycle, you will be able to see that and keep from reaching that point. I believe usually suggested is no more than 80% duty cycle but I guess that can be different per application.

Overall, should you be worried? No, I don't think so.

Blown 4-banger

Well I've heard the stock injectors can't support 7k, but I didn't know if that was with hp tuners or not. I'll see I just want to be able go faster than freakin 34 mph in first gear, rediculous!

Cobalt_Supercharged

It is not recomended to go over 80% duty cycle because the injectors can over heat or not have enough time to close completely making them spray inconsistantly and possibly cause unwanted lean/rich conditions not to mention potential failure.

For as rich as your car seems to run, I think you should be ok if you possibly lean it out a little. I'm not an expert though. I would talk to Rich at Dyno comp if you plan on tuning it in.

NJHK

They were probably talking about without HP Tuners.

I honestly don't see why it wouldn't support it because it's not like in stock form you're running anywhere close to 100% duty cycle.

Tomtwtwtw

The only reason I'd be wary of running the stock injectors at that rpm is the fact that GM includes the 42# ones with the stage I upgrade. There's no doubt they can handle the power output, but I wonder if they can fire that fast consistently without overheating, as Cobalt_Supercharged suggested.

NJHK

True but this is the wonder of HP Tuners where he can watch how his injectors are handling at that RPM.

Also, I suggest getting an Wideband, that would be helpfull to truely know if you're leaning out.

OBSSSD

Yes, you absolutely can assuming you make the proper adjustments in the IFR and PE tables

zinner

There is a reason that GM gives you new injectors with stage 1. You will 42# injectors to raise the redline to 7k and ad more boost.

Cobalt_Supercharged

Well he is not adding boost yet, just RPM. Know that I think about it you should be fine if you keep the stock pulley and raise the rev limiter. There are people running stock injectors with a 3" pulley, so I don't see why you could run a stock pulley up to 7K with the stock injectors.

denny

BINGO!

WopOnTour

If you're running more RPM then YOU ARE running more boost! (as well as more mass airflow)
The stock injectors consistently run into 100% duty cycle at 6500 rpm and numerous members here had validated through wide-band testing had indicated most LSJs were already riding the ragged edge of 13-13.5:1 @WOTn7000 (dangerously close to engine damage territory) Unless you dont plan on any sustained periods at WOTn7000 I would recommend finding some 42 pounders first. There's usually a few sets in the classifieds here and over in the Redline forums from guys upgrading their Stage 2 cars to 2.5" and 60s.
HTH
WopOnTour

denny

If he is running a stock pulley without the boost bypass mod he isn't making more boost at higher RPM. 500 more RPM with stock pulley is not even close to putting him in dangerous territory. Our cars stock, run PIG Rich.

StinkBOMB

My set up is boosting past 12.5 with no mod. And you're right 500 rpm isn't going to blow his motor.

denny

Yeah but your running a 3" pulley, he is stock. You are going to boost a few more pounds of air before the solenoid kicks in and starts to bleed off boost back to 12.xx

SilverSS/SC

I have been running mine to 7K with the stock injectors and pulley with boost bypass mod for a few months now . Rob did the tune on my car . I havent had my car on a dyno since the tune so I dont know the a/f's . I knows its not precise , but its something to give u an idea ....my 02 volts are 880-900 all the way to 7K rpm . Im putting a 3" pulley on within a couple weeks , and Rob said I will still be fine with the stockers . So Im gonna keep the stockers and have him tune it again until I get all my big upgrades with the 2.5 pulley ect.

StinkBOMB

No, it doesn't kick in at all. It goes all the way to 15 and stays that way until I shift. Beats me as to why it's that way, everything else works as it should, but I get 15lbs.

SilverSS/SC

.....and fyi on the boost . With no converter , and 2.5 cat back , with the boost bypass @ 7K rpm Im only making 12.0-12.4 psi .

djt81185

idk i saw 100%+ IDC stock with just an intake. I wouldnt feel safe. Then again idk how rich ud actually be.

Dan

Bad06SS

iTrader: (1)

If you have HP Tuners, you've got a scanner. Try it, scan, and if it's not safe, change it back. Let us know how it worked out.

WopOnTour

Hmm
It depends on what YOU call "dangerous" and "pig rich"
These terms are meaningless
Maybe get a wide band and log some real AFR numbers you'll see...

And of course it's assumed you'll be running the boost mod (or have altered the TQ managment ala the Stage kit if you have HPT) and as 500 rpm is approx another 1000 rpm of supercharger speed, there WILL be more peak boost
Wop