So........ yesterday some of us Indy area guys went to a local dyno. My mods are 2.6, 60's, CAI, S3 Heat Exchanger, Ported/Polished M62, 3'' catted dp, muffler, pump gas, and Chevycobaltss3 tuned puling around 20 degree of timing.. I went into the day hoping for a conservative 270whp & 230TQ--- After many guys telling me I would be more like 280whp.. The numbers I received were not close 261.43whp & 219.55tq. As you might imagine I was a bit shocked. (scratching my head at this point) I was the first modded SC to strap in, so I waited to for more numbers. However after watching guys that had only a 2.8 CAI w/a tune put down 3whp less then myself I became a curious.

After a guy put down 259whp & 217tq I decided to ask him if he would run me from a 40-100l 3rd gear no shift same as on the dyno. He agreed--- Needless to say i walked away from him by school buses... WTF?

Now

Another member on the forums here put down 280whp & 236tq with E85, CAI, Bad-Mab Header, 3" Catted Downpipe, 2.9", 60# Injectors, Chevycobaltss3 Tuned. These are more like the numbers I actually expected.. So he also offered to run me just to see what would happen.. We made the same run twice. (Now let me remind you he is making 18whp & 17tq more then me) We pretty much stayed door to door from 30 to 110 twice in gears 2nd&3rd before letting off.

So then I shifted back to talking to the dyno guys, but they couldn't give me an explanation either in the difference in numbers. From my car we could find No belts slip... No clutch slip... Air to fuel dropped throughout the powerband... So nothing in the tune. They let me get back on for a few more pulls I made a 4th gear pull the torque increased to 240, but still only made 263whp.

Now: Im completely aware dyno numbers aren't everything, and they are all different. Im just wanting some kind of reasoning on the discrepancies here.. Could it be the dyno? The ported blower? or???

Thanks guys sorry for the novel...


Couple quick facts
Dyno Type: Dyno Jet
Rev Limit on comparison Cobalt 7100. Mine set @7200 we both hit rev on our pulls
Same size tires and wheels to comparison Cobalt
Same Tuner as well

 

Well the first thing I told u is everyone who dynoed there numbers were low. It was proven..... Ure horssepower should also be up just like everone else's... Also btw u have 60s lol.

 

What does your powerband look like compared to theres? Just because they made more peak power doesnt mean they should beat you.

 

also you did a 30-100 roll race starting in 3rd??????

 

Hey shanes was there a way to see iat2s. And also how long did it sit before u strapped and ran.

 

And with the ported blower .. its not enough to cause any issues... Get more supporting mods cooling and ect.

 

lol had a lot of numbers floating around the last couple of days. Its was 30-100 2nd&3rd

 

Get some meth or e85

 

thats what id say too....

I did not sit for any lengthy period of time maybe 3-4 mins max with the car idling. Pulled the car on the rollers shut it off while they strapped it down. Started it and made 3 pulls..

 

i see no injectors listed in your mod list. i also see nothing for cooling besides the h/e. on a 2.6" that simply will not do

 

This! ^^

 

Shanes I can guarentee Ure issues heat. Get a dual pass and a interceptor. If Ure iat2 got higher then 140 I take timing away because of the 2.6..

 

60's... Im aware I need more cooling mods actually been thinking about going up to a 2.7 or 2.8.

However that is not the point im making. Im seeing the e85, meth, cooling mods. Yes, I could use those things, but thats not answering the question on why I'm laying down 260 but door to door with 280?

 

The cool air getting into the car while running it on the road probably brought your temperatures way down compared to at a stand still on the dyno

Definitely a heatsoak issue for sure

 

heat soak. when you're making that pull on the dyno, theres no air flowing over the h/e. and no that little fan they stick in front of it isn't going to do much of anything.

get better cooling and you'll see the numbers you want. i put down 273whp 250ftlbs on my 2.8" setup. intake, header/dp/cb, 60s, h/e, meth. and that wasn't on a ported blower like you have

 

Thanks you! So instead of blaming the dyno I actually get a somewhat straight answer. I've been talking about getting away from the 2.6, but have been told I was fine.

 

you can continue to run the 2.6, just think about getting some meth. and possibly a single pass manifold

 

I just put on my 2.6" I have a dual pass and a heat exchanger that are yet to be installed but I'm running meth and 60's. The meth helps A LOT..
:p
I still need to get chevycobaltss3 tuned

 

So what is "zzp's" recommended support mods with a 2.6?

 

yea we ran from 30 to 110 2nd gear and winded out 3rd gear. first run i put maybe a car length on him. 2nd run we turned around at the end of the street and came back and we were literally door to door at most i may have inched but it was honestly the closest race i've had and we even raced a few weeks back before we both got retuned and we were both basically door to door again.

 

Also come to think about it none of us even put the fan in front of our cars.

 

meth and more cooling mods...on 2.6..ishh =heat

 

If you run water injection, you won't need any other supporting cooling mods. The stock system is more than sufficient

what kind of gas you running out there? 20* is a substantial amount on a 2.6 if your on 91 octane. Most I could get out here on a 2.6 m62 pulley is 14-15* @ peak rpm using 91.

 

We run 93 pump out here

 

how should i know? lol. i'm not them. personally i would run a single pass, h/e, and meth