adding power to an L27 - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 08-30-2006, 06:31 PM   #21
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unfortunately i already bought the monroe gasmatics,
at the time, i did not have the money for sensas, and the price difference is a hell-of-alot.
not only that... i saw reflex (fake?) also from monroe.

mine has bucket seats, center console(not engaged) and f17, but no numbers- power eveyrthing, spoiler, have u guys noticed my grill, its got the silver around it like the sse'* and sle'*, ive also got the little cubby u talk about.
i have seen other bonnies, with different grills, and the lettering "Bonneville SE"
on the side, mine has neither.

edit: it did look beutiful before the crash.. the green was amazing...
now its purple... (chasing a brand new jeep on the highway.. he goosed..i went
right into a ford fukus, i hit the brakes but couldnt goose, hit it dead on when the car was diving.. bit of damage but engine was unharmed)
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Old 08-30-2006, 07:03 PM   #22
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Only the 92 and 93 SE had 'bonneville se' on the doors. 94 and newer did not.

With F17 listed, you have the 2.84 ratio. In other words, you have your work cut out for you. You have 'freeway cruising' gears. Not 'stoplight racing' gears.
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Old 08-30-2006, 07:25 PM   #23
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Anything stopping an L27 owner from doing what I did? I think you should look into a cam regrind and milled heads. You'll get a one-two power punch that way. Unless, of course, the L27 heads aren't able to be milled very far.
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Old 08-30-2006, 07:34 PM   #24
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L27'* are only 8.5:1 natural compression. Quite a bit to be gained there if it'* possible. But the gear ratio is still going to be a crutch.
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Old 08-30-2006, 08:54 PM   #25
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Considering the static compression ratio, an aggressive regrind with milled heads should do quite a bit for that car. You can't do much about the granny gears, but the car will still feel a heck of a lot quicker than it is!

Or if a regrind isn't up your alley, buy a new camshaft, have the heads milled .060" or so, and buy pushrods that are .060" shorter. You might be talking about an increase of 20-30 hp at the wheels, depending on the cam profile.
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Old 08-30-2006, 10:24 PM   #26
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20-30 hp would more than make up for the taller gears.

And you can get a PCM out of a 3.06 equipped car and switch differentials.
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Old 08-30-2006, 11:08 PM   #27
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Quote:
Originally Posted by willwren
20-30 hp would more than make up for the taller gears.

And you can get a PCM out of a 3.06 equipped car and switch differentials.
Very possible. But even if the stock PCM and diff were used, that kind of power increase would put a little scoot in the daily commute

Actually, this all sounds like a really good idea. 94BonnieSE, are you catching all this? An L27 with increased compression, cam, and 2.84 gears would be an awesome highway cruising car. I bet you'd even see a mileage increase.
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Old 08-30-2006, 11:53 PM   #28
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Old 08-31-2006, 12:43 AM   #29
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Quote:
Originally Posted by Hans
Quote:
Originally Posted by willwren
Most L27'* for Bonnevilles are mated to 3.06 ratios. Your car SHOULD be surprisingly quick compared to other 4-door sedans. Even the L27 is known for it'* surprising torque rating off the line.
I thought only SLE optioned SE'* received the 3.06 where the standard bonneville recevied the 2.84.

Who here has a 3.06 ratio on a non-sle?
I've got 3.06'* in my '93. And it'* definately not an SLE, with the cloth bench seat up front
But for some reason it also has the honeycomb grill, which i thought was only for SLE'* in '93.

I have an odd car...
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Old 08-31-2006, 01:16 AM   #30
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i'll delete my last post i got all the info i needed.

damn the head milling seems like a percise job.
i would need exact numbers im going to do some reading on it.
how much do milling jobs usually go for?

i will look into:
-new cam
-pushrods
-upgrade the diff
-and a reprogram on my pcm or to ****** an l27 3.06 pcm
thanks
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