Where is my hp going?

[warpig]

Ok so here is the deal I own a 84 buick regal with a 327 sb that has just been rebuilt and put in there. Its backed by a th350 with a shiftkit. My rearend is still the stock rear end that came in the stock v6 model regal(a 2.41) I know i need to put lower gears in the rear end to help it out but my problem im having right now is that i know the car is pusing right at 300 hp and 300lbs tq. I go to do a wheel stand and the tires wont spin. I romp down on the car and it chirps the tires but wont spin them. I know the horsepower is there but it just wont. It still has the stock break system on it from the v6 model but has brand new drums, rotors and pads. So i dont know if the problem im having is coming from the breaks and or also the rearend. I was planing on buying just new gears for the 7.5 rear i was gonna jump to a 3.08.
Any information or tips would be great.

warpig

 

[BrownGP83]

Does the car just fall on its face or does at rev up a little and stay at the same rpm? Is the trans slipping at all?

 

[warpig]

negative the trans holds tight the car starts to creep forward im assuming the brakes wont hold it there. But then i launch it hit 5,000 rpm and shifts never missing a beat. But when i romp on it you would think with that much power to it should spin the tires a little big. I can get them to spin a little on a launch when its wet out.

warpig

 

[busdriver]

Sounds like it can't build power because of a tight torque converter, providing the engine is tuned properly and actually making that much power. The gear is killing you too but you should be able to at least pull off a good smokey burnout. What converter are you currently using?...

 

[85 Cutlass Brougham]

That rear axle will strangle all the joy out of your engine. I used to have one and my car was a dog with it. I got a 3.23 axle from another car for $50 and put it in and it made an amazing difference. It went from barely barking the tires to barely being able to get any traction with all but the lightest throttle application at any speed below 15mph. Granted, I also put in a slightly larger mild cam and swapped from the Edelbrock 600 to a 750 Quadrajet at the same time, but the engine mods alone do not account for the performance improvement.

 

[TBRtat2]

You dont have the power for that kind of gearing.
IMO Change you gears, try something in the 3.20's to 3.30's.
Then you should be able to spin the tires. And as far as wheel stand goes, You may need to do some rear end work. Like control arms, springs, and maybe even stronger axels.

An old trick for doing wheel stands is to remove your lower control arms on your rear end. And replace them with longer ones, moveing the front mounting point on it father forward under the car, Which shifts more wieght on the rear wheels, and gives you a lot more traction.

Also, Are you still using the V-6 springs up front? If so, you better change those for stronger ones before you try a wheel stand, unless you want to bottom out when it comes down.

 

[busdriver]

"Wheel Stand", are you sure that's what he meant?..... :?

 

[arocars]

You said you have a '84 regal, rebuilt 327 sb, 300/300, shiftkit th350, 2.41 rear gear, stock rebuilt brakes. Chirps, but tires wont spin.

The reason the tires wont spin is because you're not making any horsepower in the rpm range the engine wants to run at. Your engine probably doesnt start to make significant horsepower until 1800+ rpm. The 2:41 gears wont let it achieve that rpm from stop until the car is moving 25+ mph. If its running right, it probably accelerates like crazy after that.

Anyway, you can approach this two ways. You can change the rear end gears and/or torque converter. If you're interested in straight acceleration, you might want to do both. Try 3.23:1 - 3:42:1 gears and increase the torque converter to 1800. Those changes would let the engine reach its power range quicker and give you better acceleration.

For now, dont change your brakes. That's not your problem.

 

[phaZe]

You can have all the horsepower in the world and won't do much if you don't beef up the rest of your car. A beefer rear end would help a lot like most people have said, but when you do that you lose top end speed. So, you will get up to speed faster, but when that ricer pulls up next to you, you can't smoke them.

 

[84GP455]

Hey warpig,

Get your lingo correct, a wheel stand is when the front wheels come off the ground, therefore standing the front wheels up, a brake stand is what i think you mean,(meaning standing on the brakes while stepping on the gas pedal at the same time),and if your car can't do a brake stand then you need to upgrade to a big block man!
breaks are what you take at work, brakes are used to stop your vehicle.