Dyno guess

The Blue Flame will be going on the rollers next weekend.

Back in August of 2005 I had a dynotune which produced numbers of 252.5 RWHP / 262.8 RWTQ.

Since then, I've upgraded the intake manifold(radiused, polished and coated), added Kooks headers, replaced the 4.10s with 4.30s, installed new SS exhaust with electric cutouts and swapped the 3500 stall torque converter with a 3800 stall torque converter along with a few other minor changes. I hope to find time to install fresh plugs, spark plug wires and filters.

For entertainment value only, what do you think would be the new peak numbers on the dyno from the dynotune?

I'm going to guess 270rwhp and 280lb torque.

guess is 245/250

My guess 265/265.

I hope that your going to compare cutouts open and closed too?:big-grin:

Edit: I just read your other post about the comparison. I am very curious to see that.

The anticipation is killing me!! 275/ 280

My guess is with cutouts open 275-290 rwhp.

I'm hoping for 280+ RWHP peak after the tune and I suspect it will be with the cutouts open though I don't expect more than a 5 HP difference with the cutouts. That may be optimistic, but let me explain my reasoning.

In my analysis of time slips, I see perhaps a 20 HP increase since my last dynotune judging by MPH only. At my last session I gained 12 HP with the tune but I suspect that to be less a gain this go around. And not only do I believe the intake and exhaust mods netted more HP, I believe it to have changed the A/F ratio from prime. Tweaking the A/F ratio, I suppose 5-7 HP from the tune would be my guess. So in all I hope to be looking at 25-27 HP above my previous tune which should put me in the 277-279 range before the cutouts are taken in consideration.

With the cutouts, I cannot honestly say I feel any significant HP increase even though I believe there very well may be. This fact leads me to believe the HP from the cutouts will be less than 10 HP, most likely 5 HP or less. But this minimal gain is in consideration of a free-flowing exhaust without the cutouts. Without any track runs to judge, I cannot ascertain any better prognostication. Heck, for all I know I lost power.

Time will soon tell I suppose.

Giving up HP/RWT doesn't necessisarily mean you will slow down nor more than having more HP/RWP would mean you would be quicker, as you have got a few added mods going on here (gears, exhaust, and looser convertor).
I feel what you see on the dyno with your set up won't be truly representative of the improved performance you will be getting at the track.
Looking forward to see your new results.

Roadboss said:

Giving up HP/RWT doesn't necessisarily mean you will slow down nor more than having more HP/RWP would mean you would be quicker, as you have got a few added mods going on here (gears, exhaust, and looser convertor).
I feel what you see on the dyno with your set up won't be truly representative of the improved performance you will be getting at the track.
Looking forward to see your new results.

Click to expand...

Well said.

I'm waiting for the day when power can be given as the area under the power curve rather than just the peak.

I don't think I'm following along here. I'm not sure how HP could be lower and performance be higher?

Acceleration is a product of HP and torque. Now I understand I muddied the water with the gears/converter change(and let's ignore the cutouts for now)... but with one variable being held constant, the other two are proportional. In other words, with the same torque, if the HP is increased, the acceleration is proportionately increased. That is to say if I double the HP I will double the acceleration.

Speed(trap speed in MPH in this case) is a product of time and acceleration. With the increase in acceleration comes an increase in speed which is correlated back to the increase in HP.

The area under the HP and Torque curves do indeed represent power more accurately than the advertised peak HP of any dyno result. If you extrapolate the curves as I have in the past, the most power is made at a lower rpm than the peak HP since the torque curve is consequential. IF the torque was a true linear value, then peak power would be at the same rpm as peak HP. The power curve is best represented by a polynominal equation and is parabolic in shape with the peak power usually between the peak HP and peak torque.

Most bragging rights are measured in "peak HP" from the dyno while most races are won with maximum acceleration. But unless I radically changed the torque output, I fail to see how to achieve more acceleration with less HP. I stepped up the gears from 4.10 to 4.30 and the converter went from a 3500 stall to a 3800 stall. Both factors more accurately described as 'tweaked' than radically changed from what it was before.

I love this stuff!

Going from 4.10's to 4.30's means a bigger ring gear, more rotational inertia, and thus slightly lower measured horsepower on a dyno that measures power based on inertia (ie: most of them). You'll get down the track a little faster, possibly gaining mph, maybe not, but measured hp to the wheels will be the same on some dynos (mustang dynos) and lower on other dynos (dynojets).

You made some significant changes that should increase HP though, so i expect you'll see a gain. I'm not going to venture to guess how much. Good luck, though.

Crappy pic...

My guesses were the closest, without overbidding.

46 Callaway and Be2lose were really the closest to the torque number though.

I am not surprised. I didn't want to post my guesses, but it's dead on.

You need a power adder to keep that curve UP !

what does it say? 256 hp?

sleeper said:

what does it say? 256 hp?

Click to expand...

Max Power = 258.11 Max Torque = 277.99

I have a couple maintenance issues to address and I'll probably go back on a dyno just for giggles. Something about those numbers the more i think of it. Not that I really care, more curious than anything.

When does the track open? That'll be the most telling. I really ought to get over to Hagerstown sometime and watch you...only about an hour and 10 minutes for me!

Here's a better view...

budpytko said:

When does the track open? That'll be the most telling. I really ought to get over to Hagerstown sometime and watch you...only about an hour and 10 minutes for me!

Click to expand...

It would've been a long day. :wink2-green

I was there before 11AM and left well after 6PM. All for 3 runs. :frown:

Lol, Driller, you're just like Max and Craig, crumpling your timeslip into your pocket so none of us can read it later

Are those 1.9 60 foot times?

Awesome times man! Must be that cool weather over there! I'm going to run my Shark at the track wednesday, I ran 14.08 at Infineon on Pres Day but was up against a 15-20mph headwind so I didn't get to use my helmet. Now I have the headers and a completely new exhaust system so I hope I can dip down into the 13.7's! All your upgrades seem to be just like mine, more power retreivers vs. adders if you know what I mean. Did you gut your car to get those times? I run fully loaded, but maybe I should pull my seat(drive on a milk crate, lol), speaker box and spare and run at a 1/2 tank of gas?