1996 Impala SS Performance Improvements - Chevy Impala Forums

It appears you have not yet registered with our community. To register please click here...

Chevy Impala Forums

Go Back   Chevy Impala Forums > Performance and Technical > Chevy Impala 6th Gen Discussion > 6th Gen Engine Performance

Reply
 
LinkBack Thread Tools Display Modes
Old 04-21-2011, 06:56 PM   #1 (permalink)
Junior Member
 
Beetlebill's Avatar
 
Join Date: Apr 2011
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
1996 Impala SS Performance Improvements

I have a sweet 96 Impala SS with the LT1 engine and I would like to do some research on cam, and rocker roller performance options for it and possibly a supercharger. Is there a place on the forum where I can find that kind of info.

Thanks!

Beetlebill is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 04-21-2011, 08:41 PM   #2 (permalink)
The Unscrupulous Lt. Colonel

 
Crime Scene's Avatar
 
Join Date: Mar 2011
Posts: 1,077
Thanks: 0
Thanked 26 Times in 15 Posts
http://www.impalaclub.com/naisso/ss_handbook.pdf

Click here, has just about all the answers to the questions involving performance.

Crime Scene is offline   Reply With Quote Quick reply to this message
Old 04-22-2011, 06:16 PM   #3 (permalink)
Senior Member
 
MrBuick (Magnum)'s Avatar
 
Join Date: Apr 2009
Location: Benton Harbor, MI
Posts: 997
Thanks: 0
Thanked 0 Times in 0 Posts
Unfortunately, some of that info is rather dated.

Go to the "6th Gen" section and ask your questions. You will tend to get more responses. I rarely venture into this section.

__________________
~Cory Magner "My name is Cory, and I'm an addict."


95 DCM Buick RMS 14.21 @ 91.79 "Jesus" Blown Engine at 85k
95 DCM Buick RMS 13.52 @ 99.33 "The Doctor" Blown Engine at 180k
96 DGGM Buick RMW. 263k, still on the factory tranny.

And 5 other LT1 powered land yachts Is there Rehab for this Sh*t?
MrBuick (Magnum) is offline   Reply With Quote Quick reply to this message
Old 04-25-2011, 04:23 PM   #4 (permalink)
Junior Member
 
Beetlebill's Avatar
 
Join Date: Apr 2011
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Cory,

Thanks for your reply. Could you be a little more specific to point me in the right direction. I have searched for 6th Generation and I have come up empty. I am new to the forum and I find it extremely difficult to navigate. I would have thought that performance improvements would have been a sticky thread that is kept relatively current. I live in Canada and I would really like to help my performance shop by giving them some good leads for sourcing the best performance parts list (i.e, cam, rocker rollers, heads, intercooled supercharger).

I finished the body last year after and I have already put in:
- Richmond rear end
- Hellwig suspension
- QA1 Adjustable Gas Shocks
- Borla exhaust, Edelbrock ceramic coated headers
- SSBC Brakes with 13 inch slotted rotors
- K&N Intake
- Pully kit
- Performance tranny upgrade

Next step is the top of the engine and then the supercharger.

Here is a link to some photos:

https://picasaweb.google.com/beetleb...66625945975938

Bill

Beetlebill is offline   Reply With Quote Quick reply to this message
Old 04-25-2011, 05:34 PM   #5 (permalink)
The Unscrupulous Lt. Colonel

 
Crime Scene's Avatar
 
Join Date: Mar 2011
Posts: 1,077
Thanks: 0
Thanked 26 Times in 15 Posts
I almost got mad a second ago for trying to help and one person specifically gets a thank you. But whatever. Valve spring replacement are good in preparation for big performance. Rockers. Of course the cold air intake. Throttle body bypass. F body vette or camaro Mass Air flow sensor descreened. PCM retuned. Cam (owners preference). That's all I can think of.

Crime Scene is offline   Reply With Quote Quick reply to this message
Old 04-25-2011, 08:10 PM   #6 (permalink)
Super Moderator
 
Dwayne J's Avatar
 
Join Date: Jan 2009
Posts: 3,199
Thanks: 10
Thanked 204 Times in 133 Posts
Valvesprings need to be spec'd after the cam is chosen.
Typical CAI will not fit the supercharger.
Descreening MAFs can screwup the calibration and accuracy.

The pulley kit besides being a waste to begin with is unlikely to work with a supercharger. The cam driven waterpump of the LT1 makes pulley kits about pointless.

"performance tranny upgrade" is pretty vague, FEW shops can build this tranny well, LOTS of guys buy "performance" trannies that are complete junk when compared to stock much less a real performance build.

Sorry to be so harsh but I have been at it with this car a long time and see too many people start out with a mediocre to poor mod list and plan like this and I find it very frustrating to see how far in people get before asking questions.

Your exhaust is a poor match to a decent supercharger setup, the K&N kit is not likely to fit a supercharger.

__________________
Dwayne
96 Caprice with AI 200cc package
Best et 11.5
Best MPH 116
Just another taxi
Dwayne J is offline   Reply With Quote Quick reply to this message
Old 04-26-2011, 11:35 AM   #7 (permalink)
Senior Member
 
Fuzzy from MN1988's Avatar
 
Join Date: Jan 2011
Location: Mankato, Minnesota
Posts: 418
Thanks: 0
Thanked 0 Times in 0 Posts
Dwayne
I have headers, full exhaust, CAI, some of the typical mods. What would you suggest being my next area to address for performance. I would like to start with throttle body and F-Body MAF; if thats possible. You tell me what to do..

__________________
Winning a race in a Vette with you and a buddy is awesome. Winning a race in an Impala with you and 3 other friends is BADASS
Fuzzy from MN1988 is offline   Reply With Quote Quick reply to this message
Old 04-27-2011, 01:54 AM   #8 (permalink)
Senior Member
 
Gregg-O's Avatar
 
Join Date: Mar 2008
Location: Phoenix
Posts: 2,086
Thanks: 1
Thanked 81 Times in 57 Posts
Gears & high stall TC.

Gregg-O is offline   Reply With Quote Quick reply to this message
Old 04-27-2011, 11:21 AM   #9 (permalink)
Senior Member
 
Fuzzy from MN1988's Avatar
 
Join Date: Jan 2011
Location: Mankato, Minnesota
Posts: 418
Thanks: 0
Thanked 0 Times in 0 Posts
After or before a new throttle body? Pass on the maf.

__________________
Winning a race in a Vette with you and a buddy is awesome. Winning a race in an Impala with you and 3 other friends is BADASS
Fuzzy from MN1988 is offline   Reply With Quote Quick reply to this message
Old 04-27-2011, 11:24 AM   #10 (permalink)
Senior Member
 
Fuzzy from MN1988's Avatar
 
Join Date: Jan 2011
Location: Mankato, Minnesota
Posts: 418
Thanks: 0
Thanked 0 Times in 0 Posts
I bought the car with mods already done to it and no papers on any of the work.. I also have never drove a car with this much hp or any performance vehicle whatsoever. I don't really want to have to tear into the car and find out that it already has had that done to it. How would I know if it has had that done already?

__________________
Winning a race in a Vette with you and a buddy is awesome. Winning a race in an Impala with you and 3 other friends is BADASS
Fuzzy from MN1988 is offline   Reply With Quote Quick reply to this message
Old 04-27-2011, 11:35 AM   #11 (permalink)
The Unscrupulous Lt. Colonel

 
Crime Scene's Avatar
 
Join Date: Mar 2011
Posts: 1,077
Thanks: 0
Thanked 26 Times in 15 Posts
If I could help in the least, I had this exact same problem when I bought my car. Dude claimed it had over 325 hp. But because I never driven a v8 with that much power. I didn't know so I believed him. Gregg-O suggested starting from scratch because I was having a lot of problems at first. So I did, overtime I had a dyno test done. I pushed just over stock, around 270hp with basic mods. So in short, try to get a dyno test done.

Crime Scene is offline   Reply With Quote Quick reply to this message
Old 04-28-2011, 02:45 AM   #12 (permalink)
Senior Member
 
MrBuick (Magnum)'s Avatar
 
Join Date: Apr 2009
Location: Benton Harbor, MI
Posts: 997
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Beetlebill View Post
- Richmond rear end
Tells us virtually nothing...

Quote:
Originally Posted by Beetlebill View Post
- QA1 Adjustable Gas Shocks
Garbage. They may be great when they work, but they are not very reliable. Buffman had one start to leak. Replaced it. Then next year, the other one on the front started to leak. They were not very old, so there was no reason for it. So he put some Monroe SS shocks up front, and was very surprised that it got better traction on launch afterwards.

Quote:
Originally Posted by Beetlebill View Post
- Borla exhaust, Edelbrock ceramic coated headers
The catback is the most over priced one out there for these cars, and has one of the worst return on investment performance gains. Then add to it, the WORST headers made from a performance standpoint... and you have an incredibly great exhaust setup. For what you spent on those two, you could have had a much better header/catback setup.

Quote:
Originally Posted by Beetlebill View Post
- Pully kit
Pointless, unless your point is to slow down the PS pump for roadcourse/autocrossing.

Quote:
Originally Posted by Beetlebill View Post
- Performance tranny upgrade
Once again, tells us virtually nothing.




At this point, valvesprings/1.6 roller rockers on the stock cam would be next on my list. Then have it tuned by a mail order PCM tuner, and have the shift points raised. At that point, a quality high stall torque converter will really help it off the line. This is assuming the tranny has a proper shift kit, and the rear axle has something like 3.73's. Otherwise, I would do the gears before the high stall.

__________________
~Cory Magner "My name is Cory, and I'm an addict."


95 DCM Buick RMS 14.21 @ 91.79 "Jesus" Blown Engine at 85k
95 DCM Buick RMS 13.52 @ 99.33 "The Doctor" Blown Engine at 180k
96 DGGM Buick RMW. 263k, still on the factory tranny.

And 5 other LT1 powered land yachts Is there Rehab for this Sh*t?
MrBuick (Magnum) is offline   Reply With Quote Quick reply to this message
Old 04-28-2011, 09:30 AM   #13 (permalink)
Senior Member
 
Fuzzy from MN1988's Avatar
 
Join Date: Jan 2011
Location: Mankato, Minnesota
Posts: 418
Thanks: 0
Thanked 0 Times in 0 Posts
[QUOTE
At this point, valvesprings/1.6 roller rockers on the stock cam would be next on my list. [/QUOTE]

I want to eventually be able to put an aftermarket cam in it.. If I buy the valvesprings and roller rockers now will they work out later?

__________________
Winning a race in a Vette with you and a buddy is awesome. Winning a race in an Impala with you and 3 other friends is BADASS
Fuzzy from MN1988 is offline   Reply With Quote Quick reply to this message
Old 04-28-2011, 01:36 PM   #14 (permalink)
Senior Member
 
MrBuick (Magnum)'s Avatar
 
Join Date: Apr 2009
Location: Benton Harbor, MI
Posts: 997
Thanks: 0
Thanked 0 Times in 0 Posts
That isn't a cut and dry answer. The rockers for Iron heads, need to be self aligning. So if you continue to use stock iron heads, you will need SA rockers. Otherwise, it is generally said that the NSA rockers are better for higher performance cams, as they are aligned by plates, that are sandwiched between the head and the screw in rocker stud like on aluminum heads. The plate maintains the push rod in that same plane.

Then there is the whole issue, about how some after market cams can have too much lift with 1.6 rockers, on the stock iron heads. The GMPP "845" cam in my 96 9C1 was one of those that was really border line on the exhaust. Many said you could not use 1.6 rockers on the stock press in studs on the exhaust. But... 20k-50k later, I bought the car, and it's fine. The valvespring retainer gets close to the valve stem seal(which is a shorter blue band seal), but otherwise it all seems ok.

The valvesprings, they are a lot of variables. You need to have them setup at the correct install height so you have the right pressure, and also have enough movement to allow the amount of lift you need them to allow. Meaning, you could have a spring that allows .600" of lift, but it needs to be setup at 1.6" height. On the stock iron heads, they might be setup at 1.5" height, so the spring no only has a max lift of around .500". That is the exact case with the Comp Cams 26915/26918 beehives springs.

Buffmans car has some springs sold under the number CMS614, for the stock cam. The 96 9C1, had some springs sold under the number CMS613, for the GMPP 845 cam, which is one step stronger. Unfortunatly, Combination Motor Sports went out of business, so I have no idea what springs they actually are, or what the rates are. They were popular springs for a while in the early to mid 2000's on ISSF, so maybe somebody there knows the answer.

__________________
~Cory Magner "My name is Cory, and I'm an addict."


95 DCM Buick RMS 14.21 @ 91.79 "Jesus" Blown Engine at 85k
95 DCM Buick RMS 13.52 @ 99.33 "The Doctor" Blown Engine at 180k
96 DGGM Buick RMW. 263k, still on the factory tranny.

And 5 other LT1 powered land yachts Is there Rehab for this Sh*t?
MrBuick (Magnum) is offline   Reply With Quote Quick reply to this message
Old 05-02-2011, 07:17 PM   #15 (permalink)
Junior Member
 
Beetlebill's Avatar
 
Join Date: Apr 2011
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Mr. Buick, thank you for your detailed response. I really appreciate your opinion. I have all my work done at a performance shop with a dyno, and rather than use a mail order tuner, I have have the software to reprogram the computer. He's set all of the shift point and tuned it on the dyno with the proper bunghole probes in the exhaust behind the headers.

The Richmond rear end was a move to 3.73 gears to give me more out of the hole on the bottom end. The tranny work was a performance upgrade of the switches and solenoids with carbon woven fiber plates.

The pulley kit and intake was one of my first after market addons. Yah, I get it. They go with the supercharger for sure.

I want to get the cam right and not cause problems with the vacum or braking. I want more torque through the low end because I like the performance off the launch. Nothing sweeter than a big ole' Impala embarrassing a kit in a rice rocket. I am thinking about a 206 at 50 with about 114 separation at the lobes, maybe 210. I want a cam that will take the supercharger so I will be replacing the heads to get the lift clearance I need.

I am not a mechanic nor am I a car wiz. Most of this is greek to me so I use a performance mechanic that I really like and trust who does a lot of vettes. All I know is my Impala is my baby and I want her to hummm.

Thanks again for your comments. Please feel free to add to the discussion.

Bill

I love the QA1 shocks, put about 10,000 miles on them and the ride is awesome. No plowing in the corners or diving on braking and great off the launch. I take your comment on durability seriously though, the jury is still out on that and they were not cheap.

Beetlebill is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

« HP Gains | Heads »

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy Impala Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
3.9 Performance JTGRAY Automotive Discussion 11 05-20-2011 07:40 PM
ls4 performance jay87 8th Gen Engine Performance 8 04-30-2010 06:26 AM
Steering wheel improvements? highhat Chevy Impala 8th Gen Discussion 6 04-02-2009 09:09 AM
Suspension improvements? DV06LTZ 8th Gen Suspension 5 02-10-2009 12:58 AM
what spark plug will give me the best performance in my 1996 trans am Kerry M Automotive Discussion 0 06-21-2008 06:32 AM




Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0 ©2011, Crawlability, Inc.
This site is not affiliated nor endorsed by General Motors Corp. Chevy Impala and related trademarks are the property of General Motors Corp.