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3.9L/4.0L Inline 6 Modification Guide 

 

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Posted: Tue Jul 17, 2007 5:32 pm 
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Ride: eb falcon

Location: sunnycoast
QLD, Australia

thanx heaps for the info voxace..... cant wait to get into it, got a question, do you think its necessary to dyno tune the car after you start getting into the cams and what not???

 

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93 eb2, genie extcators,luckey exuast, 3" intake with k+n pod, pedders superlows, 17" chromies

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Posted: Tue Jul 17, 2007 5:34 pm 
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NSW, Australia

Nah not necessary. Certainly wouldn't hurt, but very expensive.

 

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Posted: Tue Jul 17, 2007 5:50 pm 
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Ride: eb falcon

Location: sunnycoast
QLD, Australia

sweet, aye i herd someone sayn sumthin about a chip for your computer know anything about this???
cheers

 

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93 eb2, genie extcators,luckey exuast, 3" intake with k+n pod, pedders superlows, 17" chromies

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Posted: Tue Jul 17, 2007 5:53 pm 
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Ride: eb falcon

Location: sunnycoast
QLD, Australia

stupid question???? haha

 

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Posted: Sat Aug 18, 2007 9:24 pm 
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Ride: 1994 fairmont

Location: launceston
TAS, Australia

I got the Pacemaker headers and high flow cat thru to 2.5" exhaust the note is beautiful, performance is smoother and a little more punchy. I am now looking at cold air intake. I have not thought much about Cams. Maybe from what I have read it may be a good idea.
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Posted: Fri Sep 07, 2007 7:35 pm 
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Location: perth
WA, Australia

Hey guys i need some help working out my budget will i need to replace the dif, transmition or any of the drive train if i turbo chage my car and do the cam and exhaust mods? I drive a 1999 AU falcon series 1
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Posted: Tue Nov 06, 2007 12:12 am 
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Ride: EF Fairmont

Location: Mooroolbark
VIC, Australia

Fantastic Thread!!!! has really helped me understand the I6 mods. Thanks voxace!!! :lol: :lol:
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Posted: Tue Nov 06, 2007 8:46 pm 
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Ride: Ea Fairmont ghia

Location: brisbane
QLD, Australia

Hey Probably a stupid question and probably been asked a million and one times ... but i have a 3.9l ea auto it has nearly 300 000 k's on it more then like past that once i get all the work done but would it be better to get a second engine and get it rebuilt with a cam and new vavles and stuff of would it be cool to get it done on this one ... also is there any cam or stuff i shouldn't run on lpg??

Thanx for the help
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Posted: Wed Nov 07, 2007 2:35 pm 
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Location: Bathurst
NSW, Australia

wizzgums wrote:
Hey Probably a stupid question and probably been asked a million and one times ... but i have a 3.9l ea auto it has nearly 300 000 k's on it more then like past that once i get all the work done but would it be better to get a second engine and get it rebuilt with a cam and new vavles and stuff of would it be cool to get it done on this one ... also is there any cam or stuff i shouldn't run on lpg??

Thanx for the help


get it rebuilt or get a 4Litre or do a AU conversion

 

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Posted: Wed Nov 07, 2007 5:04 pm 
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Location: Canberra
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Anyone know what it might cost me to get an LSD installed and what the best choice for an EA Auto would be?

 

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Auto '99 AU Fairmont
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K & N Filter, NGK Plugs
Lows all 'round, Monroe's in the front, GSR's in the rear
Pioneer H/U
Tickford Bodykit
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Posted: Wed Nov 07, 2007 10:06 pm 
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VIC, Australia

Airved wrote:
Anyone know what it might cost me to get an LSD installed and what the best choice for an EA Auto would be?


I'm in the process of getting a LSD diff for my auto EA2. After reading a lot of posts, I've settled for a 3.7. Some of the other chaps here recommend a 3.9 or 4.11. For me, a 3.7 will be compromise between acceleration and fuel economy. I've been quoted $450 for a reco diff, $130 for a bearing kit (includes rear axles) & $440 for labour. I bought a good secondhand set of gears on eBay for $250.

If you have a Borg Warner diff, you can probably use a 25 spline LSD from a VK/VL Commodore. The EF/EL uses a 28 spline diff.

 

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Posted: Thu Nov 08, 2007 11:53 am 
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Location: Canberra
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Shortshift wrote:
Airved wrote:
Anyone know what it might cost me to get an LSD installed and what the best choice for an EA Auto would be?


I'm in the process of getting a LSD diff for my auto EA2. After reading a lot of posts, I've settled for a 3.7. Some of the other chaps here recommend a 3.9 or 4.11. For me, a 3.7 will be compromise between acceleration and fuel economy. I've been quoted $450 for a reco diff, $130 for a bearing kit (includes rear axles) & $440 for labour. I bought a good secondhand set of gears on eBay for $250.

If you have a Borg Warner diff, you can probably use a 25 spline LSD from a VK/VL Commodore. The EF/EL uses a 28 spline diff.


What would the advantage of the 3.7 be?

 

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Auto '99 AU Fairmont
--------------------------------------
Pacemaker 4499's, Hi-flow cat, 2.5" Redback catback
K & N Filter, NGK Plugs
Lows all 'round, Monroe's in the front, GSR's in the rear
Pioneer H/U
Tickford Bodykit
COMING SOON:
17's
30mm + 22mm adjustable sway bars.

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Posted: Thu Nov 08, 2007 12:52 pm 
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Power: 133 rwkw

Location: sydney
NSW, Australia

3.7 would be better economy than 4.11 (correct me if wrong) 4.11 would however be quicker for accerlation

 

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Posted: Thu Nov 08, 2007 2:59 pm 
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Location: Canberra
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So 3.7 would still offer power advantages on stock ratios?

 

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Auto '99 AU Fairmont
--------------------------------------
Pacemaker 4499's, Hi-flow cat, 2.5" Redback catback
K & N Filter, NGK Plugs
Lows all 'round, Monroe's in the front, GSR's in the rear
Pioneer H/U
Tickford Bodykit
COMING SOON:
17's
30mm + 22mm adjustable sway bars.

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 Profile  
 
 
Posted: Thu Nov 08, 2007 3:48 pm 
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Ride: AU2 XR8 ute & 91 EA bitsa

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If you've got a ratio of 2.9 to 3.23, then you will notice the difference in acceleration. As the BTR 4 speed auto has a high 1st gear, going to a lower diff ratio will help you get off the line quicker. Not that I'm advocating street drags, but some of these impatient ##**!! Commodore drivers are asking for it. The lower diff ratio will only make use of your available hp.

Changing the diff ratio, like non-standard tyre sizes will put your speedo out as well.

There may not be a significant difference in the revs between a 3.7 and a 4.11, but on a trip to Qld you'll notice the drop in fuel economy. I used to have a Toyota Corona with 4.11s and the screaming engine was irritating on a trip.

 

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