96' bonneville ran 16.9@83 mph - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-07-2006, 07:54 PM   #11
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Quote:
Originally Posted by BlownBuick
The cat is brand new (less than 2 weeks old). He replaced it because the car was so slow and has 116,000 miles on it. He'* also got a magnaflow muffler, but the stock resonator and stock pipes, so they're not too large for his car.

I cleaned the MAF off, and it was pretty dirty, so I guess that might help. He'* still got to test if it made a differeance.

The oxygen senser is probably stock, he'* never changed it.

He'* also got an intake (not true cold air, but it should still flow better than stock).

It does have a 2.84 gear ratio and a 2000 rpm stall torque converter, so that'* not helping him any. He does have, however, smaller tires and his speedo is pretty reading pretty high, so he should be equal to around a 3.06.

He also knows this guy with a 2000 Grand Prix GT, and it destroyed him. It wasn't even a close race.

Maybe it'* just a lazy motor???????????????
That 2.84 is a far cry from a 3.06.... Thats some really tall gearing meant for MPG'*.... I'd bet with the proper size tires he could do 35 mpg'* on the open road going about 75 or so...

Plus the 3800 II L36 just doesn't have that super strong low end torque that a series I engine would have.... But it does have some legs once it gets there...

Having that 2.84 Gear ratio and being able to get into the high 15'* is respectable in my opinion.... I doub't if my L36 with 3.06 gearing would be much faster

Damn.... Edit * I must not be able to read *

Wow 16.9 ... OMG I think an 88-91 could pull off a High 16 with 2.84 gears.... What gives

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Old 06-07-2006, 08:00 PM   #12
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Well, the best he did was a 16.9, and that was after running his car over 15 times. He usually got 17.3 - 17.5.

He would launch it with the brake to the floor, gas to the floor, and wouldn't even spin the tires. I drove it twice down the track, and didn't believe he launched it like that, but it was true.

I could see if it ran 16.3 - 16.5, that wouldn't be that far away from reality, but over 16 and into the 17'* is just crazy.

Maybe I should try the Tornado or Turbinator??? j/k
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Old 06-07-2006, 08:00 PM   #13
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i've got a 16.9 PB with a 17.1 average in my 3600 lb van... it'* not inconcevable that a lighter bonneville could hit 15'* with only minor mods.
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Old 06-07-2006, 08:04 PM   #14
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Has he ran a scan tool on his car?
That gearing is definitely killing him.
GPGTs have 3.29'* and are much lighter.
Plus with 117k the suspension is probably hurting the launch.
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Old 06-07-2006, 08:26 PM   #15
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He'* at my house and I just checked his fuel pressure, it'* 50 psi exactly. And his regulator is still good because no gas came out of it with the vacuum line off of it.

I've got a Mastertech ODB-II scanner but no specific GM program card, so the data list updates SO slow, it'* not even worth running it on the car. When I had a Tech-II or even my scanner with a GM card in it, all 30 or so parameters updating twice a second, so until I can get a good scanner on it, I have no idea what the conputer is doing. I'll run mine on it sometime tommrow hopefull, but it probably won't reveal much.
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Old 06-07-2006, 08:29 PM   #16
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Would anyone happen to know how much torque management there is in the 96 PCM?

I know the 97+ are managed to Hell and back

The 95 PCM'* almost seem to be go till you blow...lol

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Old 06-07-2006, 10:15 PM   #17
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I would imagine that the 96 PCM is like the 95 because it'* the same transmission.

I just did a compression test on all 6 clynders.

Cylinder 1 - 165 psi
Cylinder 2 - 170 psi
Cylinder 3 - 165 psi
Cylinder 4 - 170 psi
Cylinder 5 - 125 psi
Cylinder 6 - 170 psi

WTF??? His Dad owned the car since it was new and religiously changed the oil every 3,000 miles with 10W-30 Mobil1 synthetic oil, so I would think that the motor isn't too worn out.

By the readings, I could only figure that the rings on cylinder 5 are either worn out excessivly or broken. But it'* "only" about 40 psi low, and I'm pretty sure broken rings would yeald lower compression.

I added some oil to #5, and the compression went up to 200 psi, but I think I added way too much oil. When he started the car to burn off the oil, there was a huge cloud of smoke.

IDK. The saga continues.
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Old 06-07-2006, 10:43 PM   #18
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Quote:
Originally Posted by jr's3800

That 2.84 is a far cry from a 3.06.... Thats some really tall gearing meant for MPG'*.... I'd bet with the proper size tires he could do 35 mpg'* on the open road going about 75 or so...

Plus the 3800 II L36 just doesn't have that super strong low end torque that a series I engine would have.... But it does have some legs once it gets there...

Having that 2.84 Gear ratio and being able to get into the high 15'* is respectable in my opinion.... I doub't if my L36 with 3.06 gearing would be much faster

Damn.... Edit * I must not be able to read *

Wow 16.9 ... OMG I think an 88-91 could pull off a High 16 with 2.84 gears.... What gives
In October of 04 when Seth and I took our 98'* to Rock Falls Wisconsin (98 SLE and 98 SSE, both with 3.05'*) we both were running high 15'*. We felt good until we saw the Bonneville SE'* with 2.84 gearing, cheap CAI'*, and straight exhaust (DP and straight under the car and out right below the license plate) and they were running 15.5'*. One even had a timeslip for a 15.3 on a previous track outing. We were pretty much stupified, especially with all the money and mods Seth had into his car.
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Old 06-07-2006, 10:59 PM   #19
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Quote:
Originally Posted by BlownBuick
I would imagine that the 96 PCM is like the 95 because it'* the same transmission.

I just did a compression test on all 6 clynders.

Cylinder 1 - 165 psi
Cylinder 2 - 170 psi
Cylinder 3 - 165 psi
Cylinder 4 - 170 psi
Cylinder 5 - 125 psi
Cylinder 6 - 170 psi

WTF??? His Dad owned the car since it was new and religiously changed the oil every 3,000 miles with 10W-30 Mobil1 synthetic oil, so I would think that the motor isn't too worn out.

By the readings, I could only figure that the rings on cylinder 5 are either worn out excessivly or broken. But it'* "only" about 40 psi low, and I'm pretty sure broken rings would yeald lower compression.

I added some oil to #5, and the compression went up to 200 psi, but I think I added way too much oil. When he started the car to burn off the oil, there was a huge cloud of smoke.

IDK. The saga continues.

Try running a can of sea foam through it. You may have valves not closing all of the way due to carbon build up. Running on five and half cylinders would certainly cause a loss of power. It'* better to try the cheap fix before tearing things down.
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Old 06-07-2006, 11:05 PM   #20
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That'* why I think his car should be at least able to get a 16.0 to 16.2, but no way should he get a 16.9.

His front brakes are new, so they're not dragging. I'm going to check the rear drums sometime soon, but they probably aren't dragging: they're not making any noise and his car stops really good.

Just crazy thinking, but could his LIM gasket be misaligned so as to block the intake ports somewhat? I know the UIM gasket would be impossable to misalign, but what about the LIM gaskets? I know we'd never know without taking the UIM off, but has anyone ever seen anything like this happen?
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