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3.9L/4.0L Inline 6 Modification Guide
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coopdigity
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PostPosted: Tue Jul 17, 2007 4:32 pm    Post subject: Reply with quote

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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voxace
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PostPosted: Tue Jul 17, 2007 4:34 pm    Post subject: Reply with quote

Nah not necessary. Certainly wouldn't hurt, but very expensive.
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coopdigity
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PostPosted: Tue Jul 17, 2007 4:50 pm    Post subject: Reply with quote

sweet, aye i herd someone sayn sumthin about a chip for your computer know anything about this???
cheers
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coopdigity
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PostPosted: Tue Jul 17, 2007 4:53 pm    Post subject: Reply with quote

stupid question???? haha
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Tails182
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PostPosted: Sat Aug 18, 2007 8:24 pm    Post subject: Reply with quote

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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Redlinefalcon
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PostPosted: Fri Sep 07, 2007 6:35 pm    Post subject: Reply with quote

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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josho89
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PostPosted: Mon Nov 05, 2007 11:12 pm    Post subject: Reply with quote

Fantastic Thread!!!! has really helped me understand the I6 mods. Thanks voxace!!! icon_lol.gif icon_lol.gif
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wizzgums
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PostPosted: Tue Nov 06, 2007 7:46 pm    Post subject: Reply with quote

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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Froudey
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PostPosted: Wed Nov 07, 2007 1:35 pm    Post subject: Reply with quote

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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Airved
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PostPosted: Wed Nov 07, 2007 4:04 pm    Post subject: Reply with quote

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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Shortshift
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PostPosted: Wed Nov 07, 2007 9:06 pm    Post subject: Reply with quote

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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Airved
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PostPosted: Thu Nov 08, 2007 10:53 am    Post subject: Reply with quote

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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SgtBourne
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PostPosted: Thu Nov 08, 2007 11:52 am    Post subject: Reply with quote

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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Airved
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PostPosted: Thu Nov 08, 2007 1:59 pm    Post subject: Reply with quote

So 3.7 would still offer power advantages on stock ratios?
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Shortshift
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PostPosted: Thu Nov 08, 2007 2:48 pm    Post subject: Reply with quote

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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Airved
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PostPosted: Thu Nov 08, 2007 3:01 pm    Post subject: Reply with quote

My friend drives a corona, and I've noticed, after only a lukey extractor mod, that he's always about twice as quick off the mark, but lacks in top speed. Perhaps a 3.7 ratio would help just slightly?
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FordFairmont
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PostPosted: Mon Jan 14, 2008 12:13 pm    Post subject: Reply with quote

a 'electric supercharger is s**t' should be sticky'd somewhere as it pops up at least once a week.
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fresh 87'
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PostPosted: Sat Jan 26, 2008 1:37 pm    Post subject: Reply with quote

im doin up a 3.9l ea starting engine first. i was thinking putting in a cam wat do i need to get done in order to do this? or can i run it straight up of the stock parts with a bigger cam?
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fresh 87'
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PostPosted: Sat Jan 26, 2008 1:51 pm    Post subject: Reply with quote

also is it worth dropping a 4L head on my 3.9L ea?
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fresh 87'
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PostPosted: Sun Jan 27, 2008 11:32 am    Post subject: Reply with quote

jus another thing ppl does anyone no how much it would cost for an AU cinversion???


im just keeping my options open thanks
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