ok i went to the mustang dyno on saturday. was kinda depressed, but there was a 05 cobalt ss/sc with 2.8 and 60s no cooling mod's! and got 224Whp....here is mine. elavation was around 4200...any thoughts why my car is low?
red is HP
blue is torque

 

no cooling mods....

 

Did you dyno your car stock @ this exact dyno?

if not, your graph is nothing more than a drawing of your power curve.

The stock system is more than capable of insuring a 2.8 setup is cooled for a couple dyno runs. Cooling mods don't work miracles

 

u could smell the car burning! they said he was at 240 something, i hope not IAT2. but they said my car was 180...they said the cruve looked great...but idk

 

no this is the first dyno i ever got

 

maybe belt slippage or car pulling timing, however i see lsj's put down those kind of numbers on the dyno all day with the 2.8 220-250 is all

 

thats all it is ever doing. it doesnt matter if its the same dyno, there is always going to be a percentage of error. dyno is a tuning device, not a tell all power indicator

 

he has a stage 3 h/e and a dual pass endplate

 

In your list of mods didnt see any exhaust mods. What kind of boost numbers are you getting if it really high than you could be restricting flow?

 

knock

 

2.8 pulley + no supporting mods =

Look into a full exhaust (header back). The amount of airflow the 2.8 pulley produces needs a higher flowing setup than the stock manifold, downpipe, and catback.

 

I pulled 251 whp on zzp's mustang dyno with a 3" pulley and no cooling mods. Only thing i can think that helped me is the exhaust. Do a full exhaust and your numbers will be way higher probly.

 

Yeah bro the exat is correct. I just tuned 6 Balts Saturday and one guy had no exaust 3 pulley no intake and 60s,,... we put 93 in it and his iat2s were good but he had kr on his stag to tune he got from ottp bad so I tuned him for his mods and he was getttng kr here and there so I had to take timing out little by little... The maf was off by like .2% in some but most was 0 and the ve was off by 1 or -1 so tune was good... His issue was the lack of air flow... So do ure exaust and u will see better numbers

 

i have a 2.5 catted downpipe from zzp.....i guess that cobalt had a full exsaughst....maybe ill look into that

 

What was your IDC?

 

i have no proof but vince said it was either 83 or 93%...everyone says there maxed. i have a buddy that has HPT and we went and did a datalog and he couldnt moniter the IDC...he says he has no clue y he cant.

 

Hmmm that's weird, if you wanna skip all the cooling and exhaust **** and still put down good numbers, just spray some 100% methanol in there, that will cool your intake charge

 

Stu... I know...

 

i had my car dynoed that same day at the same place and only got 205... mods are below. i even had my HOM on too. my first pull was good but my second and third they said i had heat soak. i checked my ic pump and it was bad but still i only got 205 on my first pull...i thought i woulda had more for sure

 

were u running E-85 as well G11?

 

Your car will be pulling crazy amounts of timing if your pump is out.. 205 is probably pretty good for that.. LOL

 

Agreed !! Without the pump working your IAT2's will sky rocket.

 

I think 4200' elevation is enough to make a noticable differance.

 

To make numbers that low, I think it falls on the dyno. Remember not every dyno is guaranteed to produce 100% accurate numbers. Too many factors are at play. Dyno hardware (dynojet requires an add-on air brake to provide load for boosted cars), calibration, operator error, etc.

If your car is running fine, and your coolant pump is working, then screw the dyno. lol

 

well they had the dyno calibrated for us a week before we came cuz they knew a lot of people were going to come and dyno...and just to show how hot my m62 was after my first pull they poured water on it and it just steamed right off of it and i didn't see any hit the ground

as far as e85 i was running half 91 and half e85... my HOM stays on and i feel like my car runs better for some reason when i don't have HOM on. biggest thing that sucks is my gas mileage goes down but if my car is running better then i will make that sacrifice