99 Trans am stock dynoed at 303.89

**Durango** · 06-09-2011, 03:59 PM

If anyone thinks a tune is no good I tell you a real dyno tune is amazing the 1st pass the car dynoed at 267hp after tuning the car dynoed at 303.89mph

The only mod is a lid and a Flowmaster muffler that it Pretty amazing!!!!

***SMWS6TA*** · 06-09-2011, 05:37 PM

Originally Posted by Durango

If anyone thinks a tune is no good I tell you a real dyno tune is amazing the 1st pass the car dynoed at 267hp after tuning the car dynoed at 303.89mph

The only mod is a lid and a Flowmaster muffler that it Pretty amazing!!!!

Wow, our cars are fast.......

I think you meant 303.89 HP.

Was this on a Dynojet or a Mustang Dyno? If 1st that's sorta low, if the 2nd, about right

A4 or M6?

**az gt eater** · 06-09-2011, 05:57 PM

Originally Posted by SMWS6TA

A4 or M6?

What's the difference? Parasitic loss? How much diff?

To OP, that seems really low before the tune. Maybe the prev owner had it tuned, and swapped parts back before selling? That just seems really low.

**cammed goat** · 06-09-2011, 06:49 PM

Originally Posted by az gt eater

What's the difference? Parasitic loss? How much diff?

To OP, that seems really low before the tune. Maybe the prev owner had it tuned, and swapped parts back before selling? That just seems really low.

Could be. I know when I had my old cammed LS1 dynoed, it made 278whp. After three more sessions, it made 343whp. Some folks will remove some parts and make the car "semi-stock". Hell...there are people who would swap out a fully built motor for a used, unabused motor before selling the car. Ya never know.

**67CamaroRSSS** · 06-09-2011, 06:50 PM

My 02 stock down to the airfilter put down 306rwhp/323rwt... Before the tune.

**jsmith564`** · 06-10-2011, 05:09 AM

Originally Posted by 67CamaroRSSS

My 02 stock down to the airfilter put down 306rwhp/323rwt... Before the tune.

what about stock and after a tune?

**transamtom** · 06-10-2011, 08:37 AM

I only made 312HP and 325TQ w/LT's a Lid,Free Mods and Frosts Mail order tune.

I wonder how much HP loss there is turning 17" tires vs 16"tires?

I have seen other 99's with the same mods doing about the same #'s

**67CamaroRSSS** · 06-10-2011, 09:27 AM

Originally Posted by jsmith564`

what about stock and after a tune?

The numbers in my sig are after a tune with no cats or AIR and with headers into a Y-pipe. I was told that it would be a waste of $$$ to do it as a stocker.

All the other mods came after.

***SMWS6TA*** · 06-10-2011, 09:28 AM

there wouldn't be to much loss between 17" vs 16" if they are made of the same material like if say both are made from aluminum. However it would matter greatly if it was 16" aluminum vs 17" steel. Steel would have more mass/weight density so that would require more torque to turn. Now however the more rotating mass you put on the wheels the greater the drag on the drive train = loss of HP.

Most HP drag comes from the transmission through the drive shaft and then the rear. The rear having the most drag due to the gearing in the hub and turning of the wheels.

Tires also play a part in how much friction they give/have against road surface.

This is why you still see drag racers using 15" wheels.

**35th-ANV-SS** · 06-10-2011, 09:34 AM

As a side note, every DYNO reads differently. It also depends on whether it was a Mustang DYNO or DynoJet.

1/4 mile times are all that matter

***SMWS6TA*** · 06-10-2011, 09:34 AM

Originally Posted by 35th-ANV-SS

As a side note, every DYNO reads differently. It also depends on whether it was a Mustang DYNO or DynoJet.

1/4 mile times are all that matter

I asked in my first post waiting on OP to answer the same question.

**35th-ANV-SS** · 06-10-2011, 09:41 AM

Yeah I seen that. I figured I'd mention it again since there was no response.

**transamtom** · 06-10-2011, 12:38 PM

My friends bone stock(right to the tires) 99 Z28 M6 put down 303HP and 308TQ with 1/2 the mileage my car has.

Mine 123,000 miles

His 70,000 mile

**cammed goat** · 06-10-2011, 04:32 PM

And you still have the DynaPak dynos that bolt directly to the axles. I have heard it is more accurate than Mustang or DynoJet. Mine was dynoed on a DynoJet.

**Mr. Luos** · 06-10-2011, 08:38 PM

Tune done on the day of the before and after by chance?
Never seen a near stock car gain almost 40RWHP.....

Not discounting a tune in any way, but that is simply too much of a gain for a tune alone.....

**Durango** · 06-13-2011, 01:02 PM

The car is an automatic and it was spark knocking a bit before and now it runs amazingly well 1/4 mile timwe 13.33 at 105.88mph with 3:23 gears

Don't know what kind of dyno it was but I will be asking him