: I want to build up my 96 FWB Advice?



1310monster
03-15-06, 07:04 PM
I finally bought my 96 FWB last week. I want to to do some performance upgrades. I'm thinking about upgading to LT4 specs. Right now I'm looking for one of the GM kits that has the heads intake and cam all in one box. Saw one on ebay and probably should have bought it. Where should I start? Also, I want to get a set of 20's for the car but so far have only found a few styles that will work, all of which I don't care for. I'm interested in knowing if anyone else is running 20's.

Rocky

N0DIH
03-15-06, 08:07 PM
20's in the 1/4mile, right? We are lots faster than that!!!

I am guessing low 15's for mine myself.... :bouncy:

Congrats on the new ride!!! :highfive: You'll love it!

Follow HotRodSaint and Katshot's lead on mods, they both run pretty good. Take the mods in stages. The LT4 might be a little bit soggier in the bottom end and better on top. Recommend 3.42 to 4.10 gears for that one though. That cam won't like 2.56's or 2.93's.


I finally bought my 96 FWB last week. I want to to do some performance upgrades. I'm thinking about upgading to LT4 specs.....I'm interested in knowing if anyone else is running 20's.

Rocky

I~LUV~Caddys8792
03-15-06, 08:10 PM
I think he meant is anyone else running 20" rims on their FWB's

96Fleetwood
03-15-06, 08:12 PM
My 1996 Fleetwood went from this (December 2005):

http://www.richmonddubs.com/gallery/albums/leloz/159_5986_IMG.jpg


To this (February 2006):

http://www.richmonddubs.com/gallery/albums/leloz/161_6188_IMG.jpg

To finally this (March 2006):

http://www.richmonddubs.com/gallery/albums/leloz/P3090604.jpg

http://www.richmonddubs.com/gallery/albums/leloz/P3090602.sized.jpg

http://www.richmonddubs.com/gallery/albums/leloz/P3120621.sized.jpg

I would suggest working on the suspension and wheels first and then moving onto some simple bolt-ons for the engine. Is there any reason why you want to do the LT4? Why not 383? It is proven that a 383 has a much more user friendly powerband than the LT4 and can also hold this heavy monster at the track. As far as 20s, I would go no wider than 9 inches. With any wheel wider than 8 inches, you will have to modify the rear fenderskirts a bit. I have 17X8.5 on mine and the ride is perfectly balanced. Let me know if you have any questions. Goodluck and congrats on the purchase.
-Elias

HotRodSaint
03-15-06, 08:33 PM
http://www.cadillacforums.com/forums/rwd-19xx-1985-deville-fleetwood-1985/1927-lt1-lt4-hop-up.html?highlight=lt4

Here's an old thread on that topic. Also do a LT4 search, there are a couple of others that come up.

HotRodSaint
03-15-06, 08:35 PM
Is there any reason why you want to do the LT4? Why not 383?

Why not a 383 AND an LT4 head conversion?

I~LUV~Caddys8792
03-15-06, 08:38 PM
My 1996 Fleetwood went from this (December 2005):







To finally this (March 2006):

http://www.richmonddubs.com/gallery/albums/leloz/P3090604.jpg

http://www.richmonddubs.com/gallery/albums/leloz/P3090602.sized.jpg


Is that the stock grille? That looks like the one off of the 91-93 deVilles/ Fleetwoods. Either way, its beaaaauuuutifiul!

caddycruiser
03-15-06, 08:59 PM
Is that the stock grille? That looks like the one off of the 91-93 deVilles/ Fleetwoods. Either way, its beaaaauuuutifiul!

It's just a stock '93-96 grille with a Caddy emblem stuck on the center.

1310monster
03-15-06, 09:15 PM
As far as asthetics go....is the hood on these the same as the same year impala? There's a functional ram air available for those. I need to have a mirror and a small scratch near the tail light touched up. If I knew the hoods were the same, I might go ahead and spring for it before an touch up and just shoot it all at one time.

Rocky

caddycruiser
03-15-06, 09:22 PM
As far as asthetics go....is the hood on these the same as the same year impala? There's a functional ram air available for those. I need to have a mirror and a small scratch near the tail light touched up. If I knew the hoods were the same, I might go ahead and spring for it before an touch up and just shoot it all at one time.

Rocky

No, as are almost all of the body panels, the hood is different.

BCs71
03-16-06, 09:30 AM
LT4 engine was designed for a MUCH lighter car, the Corvette. It also ended up between the fenders of a handful of Camaros.

Bottom line, it is a poor choice for performance on a Fleetwood at 4500#s.

For performance you need to maintain torque. The LT1 is actually quite stout already, and opening up the air intake and exhuast systems is a great first start. From there, you may want to consider headers (not cheap by any means, expect at least $500 when all said and done). Do lots of research, there are very few logical choices for the B/D body in the end and none of them are cheap. You gotta pay to play....

The PCM has a wealth of potential with aftermarket programming. The stock tune is conservative and can be leaned out for much more power. www.pcmforless.com

Stock valve springs in my opinion are crap. Replace with a good aftermarket piece and maybe add some 1.6 roller rockers and you can get some more RPMs out of her once PCM adjusted for it.

Rear end gears leave some to be desired...... add a posi differential and 3.42 or 3.73 gears and the car will seemingly become lighter.
STock torque converter is 12" and stalls around 1400-ish RPMS which is very conservative, so you could add a high quality 9.5" converter (much lighter and saves rotational mass which frees up HP) that stalls in the 2600-ish range like from Edge racing converters. $550

All the power is no good if you can't get it to the ground or the car can't handle in the corners. BMR Fabrication sells rear lower control arms for $180. Stocks are crappy thin. Add some new shocks all the way around with perhaps Impala SS springs or some from a Caprice for more aggressive spring rates. Aftermarket sway bars front and rear (Hotchkis, HO/HA combo, 2nd gen WS6 front bar, take your pick).

20" wheels are not a performance upgrade since they'll be heavier, and are rotational mass which multiplies the weight basically when in motion. Something to consider if you want to sacrifice go for some show.....

Good luck! Lots of things to consider and tons of money to spend!

caddycruiser
03-16-06, 11:00 AM
Yes, I agree on the LT4. Have never been around a car with one, but from everything I've read and been told, those parts trully are more suited to light sports cars meant to do nothing but be rev'd out.

It's a change a lot of people always jump to think would be what they want to do to make a B or D body livelier, but it just isn't so. It's better to stick with a lot of the LT1 as it is and just go bolt on crazy...as well as things like rear end gears, PCM, some minor internal engine parts, etc.