Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: Anonymous on May 20, 2006, 03:17:23 PM

Title: TB rebore
Post by: Anonymous on May 20, 2006, 03:17:23 PM
http://www.go.jeep-xj.info/HowtoTBboring.htm (http://www.go.jeep-xj.info/HowtoTBboring.htm)

just done it myself, off to try it out  :D

BTW have a spare one done too, if anyone wants it is £10 plus exchange (to cover the costs of the flap wheels)
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Post by: Anonymous on May 20, 2006, 04:41:47 PM
Oh yes  :D  Much better
Just did a very scientific test, my xj on 30"s is a touch quicker than my mates XJ on 225-70-15s. Get a really nice roar on WOT now too  :D  Will see how the mpg does over the week
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Post by: Bubba on May 21, 2006, 08:58:01 AM
is it better than a supercharger
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Post by: Anonymous on May 21, 2006, 09:06:06 AM
Bubba, you gonner knock out superchargers for a tenner ???? :)
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Post by: Bubba on May 21, 2006, 09:11:14 AM
o shit i was thinkin forty quid priced out of the market huh
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Post by: Anonymous on May 21, 2006, 09:13:51 AM
you missed the pork pies and jaffa cakes.... :D
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Post by: Anonymous on May 21, 2006, 02:38:22 PM
Quote from: "V8 Bubba"
is it better than a supercharger


weelllllll, in terms of bhp per £ yes  :shock:
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Post by: Anonymous on May 26, 2006, 07:56:09 PM
okay then, 1 week of driving like I stole it and it did 20 miles more on a tank compared to my normal driving :wink:
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Post by: Anonymous on May 26, 2006, 08:07:11 PM
performance & economy would probably improve if you laid off the beer & curry........ :lol:
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Post by: Anonymous on May 26, 2006, 09:58:11 PM
mmm beer n curry 8)
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Post by: greggmo on May 26, 2006, 11:35:59 PM
yeh great beer and curry in the tech section. GET OUT STEW.
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Post by: Anonymous on May 26, 2006, 11:54:02 PM
No way lad :lol:  :lol:
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Post by: greggmo on May 27, 2006, 12:00:46 AM
you will or next time i see ya i will kick you in the bollocks so hard you will come back with snow on yer boots. plenty of other threads for you to destroy on here. i think birty should kick your ass if you are posting in tech again. :smt045
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Post by: Anonymous on May 27, 2006, 12:21:53 AM
can we ban shiney socket stew from the tech section :P  :lol:
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Post by: greggmo on May 27, 2006, 12:28:53 AM
steve. in the write up that you posted about this the guy was reboring the throttle body spacer out aswel. my thaughts where that the helix inside the t.b.s is part of why it works so that sort of defies the point of the t.b.s. are you also runnin the t.b.s???
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Post by: Anonymous on May 27, 2006, 12:58:44 AM
TBS things are snake oil if you ask me (especially the helix ones, dont get me started on them), going to the post 99 manifold maybe, but tuning an inlet mainfold to you exhaust etc isnt something that can be achived with a generic spacer.

Simple fact is boring the TB will give you better flow/more 02, results in better power lower in the rev range hence less throttle for given MPH, probably preaching to the converted here, but 7 pints of Timothy Taylor and I get verbal dihoreawhatishowdoyouspellit.

Have you tried a 4litre TB on your 2.5, ment to be a good tune up (go on, nick it off mandas for a test)

All I can say is I have gained noticable power throughout the revs range, and lost no MPG, down side is a very slight whistle at 2000rpm, no lost to me.

Hic   :partyman:
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Post by: JamesH on May 27, 2006, 01:56:28 AM
As I understood it the major benefits of a larger throttle body were to airflow at WOT and higher in the rev range.

The 4.0l TB on a 2.5 is a good one, so is a 68mm TB from a V8 WJ on a 4.0l  :twisted:
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Post by: Anonymous on May 27, 2006, 03:08:39 PM
personally, i couldnt be arsed to go to all that trouble........ :smt019
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Post by: Anonymous on May 27, 2006, 04:39:33 PM
Don't see how the helix helps the air when it has to do 2 90deg turns before it gets to the in port
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Post by: Bubba on May 27, 2006, 04:55:20 PM
yup on paper a tbs should not work but they do seem to so its a suck it an see thing
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Post by: Anonymous on May 27, 2006, 05:24:44 PM
mm beer and curry  8)

Anyway if you do have a TBS how do they act when you already have a K&N panel filter fitted?

Is it a even bigger power/economy gain?
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Post by: Anonymous on May 27, 2006, 11:15:02 PM
there is a science in tuning the length of the inlet port to TB distance to tune out resonance, same goes for the exhaust headers, just dont see the science in a hiclone
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Post by: Anonymous on May 27, 2006, 11:19:43 PM
Possibly didn't explain fully what I meant

What I meant with is with all these performance improvements how much BHP could you claw out of an I6 engine
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Post by: JamesH on May 29, 2006, 09:12:17 PM
With all the bolt-on modifications out there you can get up to around 225 BHP from the 190 BHP or so that is standard.

Beyond that you need internal modifications and new cylinder head.