AP stage 1

[AZMS3]

Hi, im looking to get an AP soon and will be reflashing for the stage 1 91 oct. Only mods I have are the cobb intake. I was wanting to know what people out there have to say about the performance they noticed from stock to stage 1 or stage 2.

Thanks

 

[240ka]

you would run stage 1 + SF(which is SRI) and what ever oct gas you use

you will noticed you will make power to about 6300 before you feel the turbo loose alittle power but you can take it beyond 6300

you can rev alot higher and stay in gear longer, car pulls harder. boost is raised. cant remember the boost targets but get one

tune>stock tune

plus cobb released Launch control and FFS on the new maps. you have to get ATR(access tuner race)

 

[AZMS3]

Thanks, It sounds like the car will pull harder, and have a better and smoother powerband. But does anyone know of some numbers such as hp and tq increase from stock to stage 1 or even stage 2. I know Cobb claims something like 6% increase for stage 1

 

[240ka]

all depends on your mods. numbers vary.

 

[8.5MS3]

my sri gave me ~18whp, tuned probably another 20. hard to say since these cars have tons of variations.

One word of caution - when you do flash the car, monitor engine vitals closely at first. some cars like the OTS maps, others like mine didnt, i had to go with a protune to get it running good.

 

[AZMS3]

my sri gave me ~18whp, tuned probably another 20. hard to say since these cars have tons of variations.

One word of caution - when you do flash the car, monitor engine vitals closely at first. some cars like the OTS maps, others like mine didnt, i had to go with a protune to get it running good.

Thanks man on the numbers for the ap with stage 1. I was going to reflash and eventually get a protune, but will for sure monitor my engine vitals. What do you think is the best to montior, such as a/f, knock, boost. And what are safe numbers for a/f, knock, boost, and fuel pressure.

How does the car feel now with the protune compared to the flash?

 

[8.5MS3]

Thanks man on the numbers for the ap with stage 1. I was going to reflash and eventually get a protune, but will for sure monitor my engine vitals. What do you think is the best to montior, such as a/f, knock, boost. And what are safe numbers for a/f, knock, boost, and fuel pressure.

How does the car feel now with the protune compared to the flash?

KR, Actual AFR, Boost, LTFT, Fuel Pressure optimal numbers in order
0.0, 14.7 at idle dropping to 11-11.5 at WOT, 17-19psi at wot (-10.5 at idle), as close to 0 as possible - anything over +/-10 is a concern, ~430psi at idle 1600 or higher at WOT.

If you dont reach -10psi at idle, you have a leak in the intake, this will also show as high ltft since the computer is compensating for unmetered air. if you cant hold 1400psi at wot, your stock cdfp is crapping out. boost shouldnt spike over 20-21psi

with a protune i am running at 20 psi tapering to 19 by redline, gained an additional 20 hp. total gain of 55 peak hp and 55 peak torque. but i gained 100 hp/tq at 6-6.5k when the throttle plate closes on the stock tune

 

[AZMS3]

with a protune i am running at 20 psi tapering to 19 by redline, gained an additional 20 hp. total gain of 55 peak hp and 55 peak torque. but i gained 100 hp/tq at 6-6.5k when the throttle plate closes on the stock tune

Damn those are some nice numbers for stage 1 with a tune. Especially the increase around redline. Can't wait to get mine and actually get it protuned.

Whats with the new map that is available from Cobb (1.04). Is it only Launch Control and Flat shifting upgrades or a better base map then the previous versions.

Thanks

 

[MSMS3]

Man, I had no idea you were tuned for a steady 20 psi on that dyno you posted on another thread, and running 19 psi out to redline and encouraging others to do this.

I'm reluctant to say this, but a steady diet of 20 psi on this turbo with any tune, no matter how good, you are going to have trouble. I hope and pray I am wrong.

Can you let us know in six months if the engine is still alive on that tune? Seriously.

 

[8.5MS3]

I'm not encouraging anyone to go with this amount of boost. thats what i am running. I could advance the timing and drop boost back to 17-18, but that's much more dangerous. a tank of bad gas and pop...and this was with a protune, if you do this with ATR well, your an idiot. guy i went to is notorious for stupid high horsepower with daily driveability. hes got one customer running 45 psi on a stock sti block with forged internals. his personal car runs 10's in the quarter on pump gas, no meth, no race gas or any of the other crutches.

i rarely hit 20 psi, its just there if i need it, even when i go wot, i'll hit 16psi car only goes to 20 if my foot is welded to the floorboard. kinda looks like my tuner set it up so that it hits 20 after the electric throttle position climbs above 70, not when my foot hits the floor. been on this tune for 3 months now.

I had the same concerns when i first got the tune, sent in some datalogs to cobb and they gave me the green light, as did some other tuners such as surgeline and some locals. heres a quote from cobb

If you look at that run, your FP does drop, but your AFR is bellow 11:1 and your injector pulse width is 72ms. Then the next load cell, pulse width is down to 8ms and pressure is back up. Remember, there are two ways to inject fuel, high pressure and shorter duty cycle, or lower pressure and longer duty cycle AND since this is at a lower RPM there is more time to inject fuel. I don't think this tune is dangerous. Your AFRs are fine, your KR is fine and your boost is not creeping at all. You get a TAD lean at the tall end of 5,000 rpm but not dramatically so.

Talk to your tuner to see what your boost targets are. You aren't spiking and you arent creeping so it would seem that this is what the car was tuned to do since in both logs it exhibits the same behavior. This is certainly an aggressive tune, but nothing to be worried about.

Sunoco 93 is some pretty cool stuff, so you can probably get away with lots of boost on this fuel. Talk to your tuner. If he was shooting for 18psi, then maybe you need to get some tweaking done, if he was targeting 20psi, you should be ok.

Travis
COBB Tuning

I'm welcome to all comments and concerns, I am in no way a professional tuner and that is why i have joined these forums. But at the same time guys like myself can help to dissolve some of the mis information that resides within the forums as well. (the sri vs cai battle for example)