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Old 05-05-2003, 06:14   #1 (permalink)
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EB Ė best Exhaust size / Diff ratio for EB II

All right, me and a mate have just recently given Holden the dump and picked up a few ford EB IIís. Iím very technically minded and have had a lot of experience with doing up cars and mechanics so chuck it all at me.

Both cars are 4 speed autoís and will have a stage 3 shift kit put through them shortly, as well as the intakes widened and K&N air filters fitted. Plugs, high flow injectors, leads, fuel pumps and such will all be changed to higher quality setups, but what Iím really interested in is exhaust size and diff ratios.

Iíve done a lot of searching and phoning around on the subjects so I have got a fair idea on what diff ratios tend to work best in the EBís and what exhaust sizes give the best but I want to get some opinions.

The cars are being worked for performance not soo much as sound, so a quicker take off will far outweigh a low note capable of setting off every car alarm in the neighbourhood.

If anyone has had any experience with diff ratios and exhaust sizes on an EB II then please post below. And please, think constructive. One thing I used to find a lot on Holden forums was people telling me if I want performance get the next model up. I am happy in my decision to work with the EB II and donít wish to be told to get an XR6 or something like thatÖ Well, maybe you can tell me once, but thatís it... :)


Thanx in advance,
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Old 05-05-2003, 06:30   #2 (permalink)
Two SC 61's = trouble
 
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Do a search..
But imo copy the latter model E.L's- XR's like more compression,higher fuel pressure, mill or mod inlet maybe shorter runners, better valve springs and cam with higher lift esp. Them I like a low final drive if power is your go and you don't cruse interstate too often like 3.7 f/d or lower.. Similar to latter XR's only 1+ step more.. There seems a restriction in those inlets about 130 rwkw they seem to hit a wall.Ford went vairiable inlet from E.F and they fit but you need some way of making it work, some guys on here have tried/ done just that...
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Old 05-05-2003, 12:20   #3 (permalink)
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3.45 (Xr6 LSD) are a popular choice and would be the best choice for performance vs economy.
Exhausts well they are all over the place.
I've had excellent experiances with the Dynomax/Lukey headers and exhausts but they are the cheaper brand.
Pacemakers are good as well.
Don't worry to much about the cats. The standard Ford Cats are excellent and flow quite well.
Hope that helps dude.
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Old 05-05-2003, 21:06   #4 (permalink)
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for exhaust size I think stock on EBII was 2" maybe 2.25, most people reckon 2.5 is enough for non-forced induction engines, apparently 3" can be a problem if you want to low the car a fair way.

I have pacemakers, no complaints from me but i havent driven any other falcon 6's with extractors so i cant really compare...
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Old 05-05-2003, 21:42   #5 (permalink)
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i dont think the EA==> ED inlet manafold has a 130rwkw limit on it, seing that its flows better than the dual runner model
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Old 05-06-2003, 01:04   #6 (permalink)
Two SC 61's = trouble
 
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Quote:
Originally posted by Walkinshaw
i dont think the EA==> ED inlet manafold has a 130rwkw limit on it, seing that its flows better than the dual runner model
Well show me some numbers then where an n/a E.B goes much over 130 rwkw.The latter AU's can quite easy with some small mods..Up top rpm the latter inlets surely can't be beat'n with its short runners...Excluding fabricated inlets..
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Old 05-06-2003, 06:08   #7 (permalink)
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Well sounds as though ripping the guts out of a VL diff and having them wedged in mine, or ripping the rear axel of an XR6 is gona be the way to go. A 3.45 ratio seem to be the one that most people chose, even over 3.7. Funs gona be recalibrating my speedo for it. Praise god for Ford Mods web site.

Working on an EB II is quite a step up from the Holden VK Iíve been tinkering with lately.

As far as exhausts go sounds to me like the standard cats arenít too bad; crazyís post wasnít the only one to confirm that. A 2 1/2Ē with extractors sounds decent for the EBís, Iíve heard talk around here that anything above that starts to cut into your performance anyways, so ill see what my mates at Bevicís Auto can track down for me.
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Old 05-06-2003, 06:47   #8 (permalink)
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Wouldnt go more than 2.5". In a 3" exhaust the gasses cool down to fast (becoming more dense) and therefor more power is needed to puch the gasses out the exhaust.
Learnt this in a physics assignment last year, so school wasnt that much of a waist of time :)


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Old 05-06-2003, 07:02   #9 (permalink)
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Good to see that physics class actually showed up something useful for someone. Not too say that some of what was taught wasnít interesting, I just questioned the need to know a great deal of it.

Anyways what you said makes sense. A 3Ē would not heat up as much because it would have a grater cooling surface area causing the gasses to also lose a lot of there heat. Funny, when it comes to exhausts bigger is not always better. If the gasses are too cold, they would make it harder for the car to push them through then if they were flowing through a well warmed 2 1/2Ē system where adequate space is allowed for quick removal of them, but cooling area is still kept to a minimum.
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Old 05-06-2003, 07:18   #10 (permalink)
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Thats why i hate lil jap 4cyl cars with 3" zorst thinking that they get a power boost. For hi power cars it needed (more gas to be expelled), but for most its a waist of money.

There is a site somewhere which has 'Exhaust theory' article on it, good read, havent been able to find it for ages but. tells you what to look for.



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2nd EF GLi, 'custom' interior, extractors, exhuast
3rd EA Fairmont 5spd, low'd, extractors, exhuast, head
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4th EB2 Fairmont, EL dash and interior, BBM, LSD etc etc
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