1979 ls swap questions - Corvette Forum : DigitalCorvettes.com Corvette Forums
 
 
Go Back   Corvette Forum : DigitalCorvettes.com Corvette Forums > C3 Corvette Forums > C3 Corvette
Register Forums Garage Garage Mark Forums Read Auto EscrowInsurance Advertise

Notices

C3 Corvette
C3 Corvette General | Technical | Performance | Aftermarket | Discussions

Other sections:
Corvettes Classifieds
Corvette Detailing & Car Care
Corvette Audio/Video/Radar
General Automotive/Shop/Tools
Corvette Performance Driving/Racing

( Sponsored by: Zip Corvette Parts )

Shops/Tuners
Custom Image Corvettes
A&A Corvette
Corvette tuner

Interior
Corvette aftermarket products

Insurance



Parts & Products
Race Ramps
Edelbrock
ATI/Procharger
Corvetteguys.com
Melrose Motorsports
Parts Taxi
Airaid
Pfadt Racing
Madvette Motorsports
Hi-tech Custom Concepts
Corvette Garage
Corvette Parts and Accessories
Corvette Car Care Products
Corvette HID

Tracks/Schools
Bob Bondurant School of High Performance Driving
Corvette driving school

Wheels/Tires
Cray Wheels

Services
BADWERKS.com
Reply
 
Thread Tools
Old 11-26-2017, 07:28 PM   #1
elee10
DC Crew
 
elee10's Avatar
 
Posts: 4
Member #176290
Member since: Nov 2017
Location: decatur georgia

My Corvette(s)
1979 L82

Thanks: 0
Thanked 0 Times in 0 Posts
1979 ls swap questions

I have a 79 that I'm doing a frame off on. The motor I had built at my buddies shop and he has steered me into some sunlight but I still need a little help. Its a beefed up ls1 6.0 with ls3 heads and a ls9 blower, classic air a/c, the 1st ls9 assessory kit from cvf racing, tanks inc fuel pump, holley dominator efi harness. Have a rebuilt 4l80 trans but cracked it and need a core to swap internals. Ive seen threads that talk about the swap but are like 10 years old and a guy I saw that did the ls9 swap wont answer me on youtube. my questions are:
1-what cold air intake have yall found to work?
2-can I use my surface pro 4 with the holley system to tune
3-anybody in GA have a 4l80 core I can swap my internals 2
4-how did you guys run exhasust
5-how do I hook the vacuum up for the headlights
6-if you have done an ls9 swap please contact me I have a million questions that I will post.
also I will post pics as I go along to help the next guy finish without looking like an idiot like I am
Attached Thumbnails
Click image for larger version

Name:	image4.jpg
Views:	77
Size:	108.0 KB
ID:	21810  
elee10 is offline   Reply w/quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-26-2017, 07:29 PM   #2
elee10
DC Crew
 
elee10's Avatar
 
Posts: 4
Member #176290
Member since: Nov 2017
Location: decatur georgia

My Corvette(s)
1979 L82

Thanks: 0
Thanked 0 Times in 0 Posts
heres my cracked transmission
Attached Thumbnails
Click image for larger version

Name:	image3.jpg
Views:	70
Size:	94.9 KB
ID:	21818  
elee10 is offline   Reply w/quote Quick reply to this message
Old 11-27-2017, 03:04 AM   #3
The Torch
DC PIT CREW BOSS
 
The Torch's Avatar
 
Posts: 35,274
Member #799
Member since: Apr 2003
Location: Western Kentucky

My Corvette(s)
2004 Black/Mod Red-Z06

Thanks: 281
Thanked 698 Times in 487 Posts
The only one I can help with is #5. You might want ot consider changing to electric. There are several threads here on the conversion
The Torch is offline   Reply w/quote Quick reply to this message
RACING...Because with baseball, football, basketball, tennis, and golf, you only need one ball

I used to think that I had learned patience as I got older. Then I realized that I just didn't give a shit
 
Old 11-27-2017, 01:40 PM   #4
Slow & Leaky
DC Crew
 
Posts: 552
Member #84470
Member since: Apr 2009

Thanks: 0
Thanked 12 Times in 12 Posts
There will be excellent full time vacuum at the throttle body.

If you don't have ports between the throttle body and blower.......A lot of other supercharged applications still hook vacuum accessories to the normal spots downstream from the blower. There's still vacuum up to around 20% throttle. Use a check valve in the line and the headlights should work fine.

good luck!
Slow & Leaky is offline   Reply w/quote Quick reply to this message
Old 11-27-2017, 02:07 PM   #5
Pops71lives
DC Crew
 
Pops71lives's Avatar
 
Posts: 726
Member #132985
Member since: Oct 2013
Location: Goshen/Indiana/USA

My Corvette(s)
1971

Thanks: 245
Thanked 106 Times in 96 Posts
4. I went with side pipes
5. I went electric.
I look forward to seeing some pics
Pops71lives is offline   Reply w/quote Quick reply to this message
Old 11-29-2017, 03:40 PM   #6
blueday
DC Crew
 
blueday's Avatar
 
Posts: 165
Member #49549
Member since: Aug 2006
Location: LAKE CHARLES, LA

My Corvette(s)
79 VETTE

Thanks: 16
Thanked 14 Times in 13 Posts
I'm doing an ls3 swap now. Sounds like you've already dug around some but be sure to keep in mind control arm clearances around the power steering pump/alternator and water pump sides. I say that because it looks like the accessory setup you have moves the alternator and power steering lower because of the throttle body angle.

Here's a link to my ls3 swap if you haven't seen it foraccessory reference pictures and also for you classic auto air install. They sold me some universal kit that did not universally fit on my later c3 knowing some of the install is very very similar to the earlier c3's.

https://www.digitalcorvettes.com/foru...d.php?t=283297

1. Most just do a filter setup in the engine bay. Some will end up building a custom setup or go so far as to going to a different size radiator to get cool air from.
4. Sidepipes here. Patro just did some hunting for headers. Some of it depends on you steering setup. Some just keep the factory manifolds and route new pipe to the back.
5. I think you'd enjoy the electric motors better, but ls swaps aren't cheap either so like said above, hook up to engine vacuum and add/replace check valve.
blueday is offline   Reply w/quote Quick reply to this message
Old 11-29-2017, 06:28 PM   #7
brent319
DC Crew
 
brent319's Avatar
 
Posts: 1,513
Member #113953
Member since: Sep 2010
Location: iowa city/iowa/usa

My Corvette(s)
76 LS1/Richmond 6

Thanks: 61
Thanked 98 Times in 94 Posts
#1. I routed my tube down and put a cone shaped filter on in front of the MAF. I made a housing that surrounds it and draws air from below the radiator. I tried to over size it as much as possible to limit restriction, but don't have any way to measure that. I did, however, put the outside temp. sensor on my Dakota Digital gauges behind the radiator where the cone filter was formally located. I compared that to the ambient air temp on my ECU readout via a bluetooth dongle running into my iPhone. Before startup the temps were about identical. I watched the difference as I drove around and it did make a huge difference. The biggest seems to be when I was on the highway and then slowed down in town. The difference was a full 60 degrees. It was less on the highway but still very significant. I forgot to take pictures when I was building the box out of fiberglass, but took some as well as I could once installed.
I had to add a tab on the spreader bar bracket so it could be moved toward the engine and open a little more room to pass down.
IMG_5308 by brent hagist, on Flickr
IMG_5310 2 by brent hagist, on Flickr
IMG_5311 2 by brent hagist, on Flickr
brent319 is offline   Reply w/quote Quick reply to this message
Old 12-03-2017, 02:29 AM   #8
Patro46
DC Crew
 
Patro46's Avatar
 
Posts: 1,012
Member #136162
Member since: Dec 2013
Location: Tulsa Oklahoma

My Corvette(s)
C3 Convertible

Thanks: 51
Thanked 129 Times in 106 Posts
I've brought this up before, but it bears repeating. When your searching for a cold air alternative on an LS swapped C3, you already know there isn't an easy solution, by any stretch of the imagination. What you might not know, unlike any carburated version of an engine, the fuel injected LS has a handful of sensors, one of which is an IAT sensor. It's job is to measure intake air temp. No big deal, right? Wrong. The IAT sensor has a table on the pcm that takes intake air temps and scales the engine timing to match. Yea....so?
Most folks put a 90 on the throttle body and toss a cone filter on it because...it works.
Sort of anyway. Here's why, but first a question.
When your cruising around on a hot summer day (or any day for that matter) how hot you think your underhood temps run? Toss that number around in your head then realize that iat table starts pulling engine timing when the iat's hit 130 deg or so.
The reason nobody seems to care is the engine still runs...ok, because the timing is being pulled in the background and most havent a clue its even taking place...but it is. I didn't know it was happening until I hooked up HP Tuners and began recording logs. I was exceeding 150 deg iat's with a 90 and a cone filter with the pcm effectively pulling 5 to 6 deg from the engine timing. Keep in mind this was before the LSA blower install when it was basically an LS3. Now, more than ever keeping the iat's cool has become a project, having to shrink the horizontal dimension of the radiator to allow room for a 4 inch cold air solution to draw from in front of the radiator/condenser/supercharger heat exchanger.
I did it, but it was a pain, and a newer design is currently in the works.
Attached Thumbnails
Click image for larger version

Name:	20171013_160457_1512293579777.jpg
Views:	95
Size:	61.3 KB
ID:	21841  
Patro46 is offline   Reply w/quote Quick reply to this message
Old 12-03-2017, 12:54 PM   #9
Pops71lives
DC Crew
 
Pops71lives's Avatar
 
Posts: 726
Member #132985
Member since: Oct 2013
Location: Goshen/Indiana/USA

My Corvette(s)
1971

Thanks: 245
Thanked 106 Times in 96 Posts
Spot on Pat! I wish I had addressed this before the car went back together and painted all pretty. I think there's a way to get the filter over the radiator depending on what radiator is used. I have a gap between the radiator and the support. I'm thinking if you channel an area you might be able to go over. That's what Winter is for..
Pops71lives is offline   Reply w/quote Quick reply to this message
Old 12-03-2017, 05:00 PM   #10
Patro46
DC Crew
 
Patro46's Avatar
 
Posts: 1,012
Member #136162
Member since: Dec 2013
Location: Tulsa Oklahoma

My Corvette(s)
C3 Convertible

Thanks: 51
Thanked 129 Times in 106 Posts
Quote:
Originally Posted by Pops71lives View Post
Spot on Pat! I wish I had addressed this before the car went back together and painted all pretty. I think there's a way to get the filter over the radiator depending on what radiator is used. I have a gap between the radiator and the support. I'm thinking if you channel an area you might be able to go over. That's what Winter is for..
I can see this as a possibility in an FI NA engine, because the throttle body is positioned in the center.
With my LSA, it has around a 33 deg bend to the drivers side, pretty much leaving the drivers side to deal with the solution. Josh at Custom Image Corvette had the idea I began with-shrinking the horizontal area of the radiator. I also had to shrink the condenser as well as the front mounted secondary supercharger heat exchanger. This at least can get you in front (or to the side) of the radiator for a cold air solution.
For a straight LSx application, I agree going over the top, even if you had to notch the radiator support and shink the vertical area of the radiator
Patro46 is offline   Reply w/quote Quick reply to this message
The Following User Says Thank You to Patro46 For This Useful Post:
Pops71lives (12-03-2017)
Old 01-04-2018, 09:27 PM   #11
elee10
DC Crew
 
elee10's Avatar
 
Posts: 4
Member #176290
Member since: Nov 2017
Location: decatur georgia

My Corvette(s)
1979 L82

Thanks: 0
Thanked 0 Times in 0 Posts
Update
Finally got around to working on it. Got the gas lines ran(gotta mount the regulator on firewall)
Heater hoses barely cleared the control arm but there clear
Power steering and alternator side has plenty clearance
Trans mission lines ran
Put coil packs and spark plugs in
Thermostat housing in
Body goin back on next week after I finish a few other odds and ends
elee10 is offline   Reply w/quote Quick reply to this message
Old 01-05-2018, 08:40 PM   #12
Maniacmechanic1
DC Crew
 
Posts: 5,331
Member #176497
Member since: Dec 2017

Thanks: 209
Thanked 220 Times in 200 Posts
Quote:
Originally Posted by elee10 View Post
heres my cracked transmission
If you have the broken piece yet I would TIG Weld the transmission case back together.
The trick is to preheat warm the area up with a MAP Gas blowtorch.
Heat it to 300 F. Check with an Inferred Pyrometer temp gun.
Then TIG Weld on the outside & inside of the Bellhousing.

Hold the piece in place with a nut & bolt with washers or flat stock steel.

4L80E transmissions are out there if you want another trans case.
They have lost popularity except for the Pro Touring groups.
Maniacmechanic1 is offline   Reply w/quote Quick reply to this message
Old 01-05-2018, 08:45 PM   #13
Maniacmechanic1
DC Crew
 
Posts: 5,331
Member #176497
Member since: Dec 2017

Thanks: 209
Thanked 220 Times in 200 Posts
As long as your not severe drag racing the welded 4L80E trans case will hold up.

It looks like the trans was hanging by the bolts initial instead fully seated on the engine block dowel pins.

All GM transmissions have this weak area. The Bellhousing.

The GM TH400 Turbo 400 has the strongest beefed bellhousings.
Maniacmechanic1 is offline   Reply w/quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Corvette Forum : DigitalCorvettes.com Corvette Forums forums, you must first register.
Please enter your desired user name (12 CHARACTERS MAXIMUM), 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:
City / State / Country?
Where you live
What kind of Corvette(s) do you own?
This field is not required.
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools

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

Forum Jump

Powered by vBadvanced CMPS v3.2.2

All times are GMT -6. The time now is 01:53 AM.




Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
2003-2011, DigitalCorvettes.com - All Rights Reserved