Author Topic: Boost  (Read 3415 times)

ben marks

  • 200BHP Senior Member
  • ****
  • Posts: 150
    • View Profile
Boost
« on: 17:56, Mon 26 September 2011 »
Im so very sure this has been asked before but for when i am thinkin of uping the boost on my 5 wot is the limit on a standard engine

James5

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 2769
    • View Profile
    • http://www.rtoc.org/boards/member.php?u=34
Re: Boost
« Reply #1 on: 19:50, Mon 26 September 2011 »
14psi carb top which will work out to be around 9-10psi carb base, ideally any change in boost and you should get the afr's checked to make sure all good.

ben marks

  • 200BHP Senior Member
  • ****
  • Posts: 150
    • View Profile
Re: Boost
« Reply #2 on: 20:04, Mon 26 September 2011 »
cheers mate thanks for the heads up long way off from messing with the boost yet still need to get it on the road lol

markey mark (bd)

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 1851
    • View Profile
Re: Boost
« Reply #3 on: 21:37, Mon 26 September 2011 »
Standard engines can take a hell of alot of boost, but as James says the carb needs to be jetted correctly for the boost.
The thing that will determine your boost limit is the turbo, other components come into it too but turbo is main one.
BD Autosport - Renault 5 gt turbo tuning and repairs.

ben marks

  • 200BHP Senior Member
  • ****
  • Posts: 150
    • View Profile
Re: Boost
« Reply #4 on: 21:54, Mon 26 September 2011 »
So when it comes to jeting the carb is there a rule of thumb on wot size for wot boost and the same for the a/c ?

fordy

  • 200BHP Senior Member
  • ****
  • Posts: 242
    • View Profile
Re: Boost
« Reply #5 on: 22:10, Mon 26 September 2011 »
only thing you can do is check with a wideband and go from there

other peoples carb specs may not be 100% on yours

1.2mm main
1mm ac
1.2 2nd stage
will be a good start for 14psi on a stock t2

ben marks

  • 200BHP Senior Member
  • ****
  • Posts: 150
    • View Profile
Re: Boost
« Reply #6 on: 22:32, Mon 26 September 2011 »
Keep hearing wideband can u explain for me ? I take it its to do wit fuel mixture ? Im a diesel fitter so   petrol and carbs are not my thin lol

tubbyG

  • 200BHP Senior Member
  • ****
  • Posts: 409
    • View Profile
Re: Boost
« Reply #7 on: 23:15, Mon 26 September 2011 »
Yes, Wideband guages measure the air/fuel mixture in the exhaust, and are pretty essential if you plan on upping boost.

Gives the opportunity to set your car up yourself - saving :D

ben marks

  • 200BHP Senior Member
  • ****
  • Posts: 150
    • View Profile
Re: Boost
« Reply #8 on: 23:23, Mon 26 September 2011 »
Sweet so like abit lambda sensor then do ya have to get an exhaust designed to fit this how much do this sort of thin cost ?like i sed new to all this so sorry for the questions but no better place to learn lol

James5

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 2769
    • View Profile
    • http://www.rtoc.org/boards/member.php?u=34
Re: Boost
« Reply #9 on: 23:33, Mon 26 September 2011 »
You just need to get a lambda bing welded into your downpipe and just simply buy a decent wideband kit, personally I recomend the AEM afr kit for it's easy use and easy install and faultless usage.

This is site belongs to RTOC member Chris aka Scoff top bloke, tell him James5 referred you  :mrgreen:  this is the kit you want


http://www.efi-parts.co.uk/index.php?productID=204

For any info on the readings just post a thread on here or RTOC and one of us can give you the advice of what mods needs to be done to the carb and where :D

tubbyG

  • 200BHP Senior Member
  • ****
  • Posts: 409
    • View Profile
Re: Boost
« Reply #10 on: 23:36, Mon 26 September 2011 »
Beat me to it James  8)

I also recommend the AEM kit.....

ben marks

  • 200BHP Senior Member
  • ****
  • Posts: 150
    • View Profile
Re: Boost
« Reply #11 on: 00:02, Tue 27 September 2011 »
Quote from: "James5"
You just need to get a lambda bing welded into your downpipe and just simply buy a decent wideband kit, personally I recomend the AEM afr kit for it's easy use and easy install and faultless usage.

This is site belongs to RTOC member Chris aka Scoff top bloke, tell him James5 referred you  :mrgreen:  this is the kit you want


http://www.efi-parts.co.uk/index.php?productID=204

For any info on the readings just post a thread on here or RTOC and one of us can give you the advice of what mods needs to be done to the carb and where :D

Excellent mate thanks for the help when Im at that stage ill look it up cheer mate

denty225

  • 200BHP Senior Member
  • ****
  • Posts: 230
    • View Profile
Re: Boost
« Reply #12 on: 20:55, Wed 28 September 2011 »
Quote from: "James5"
14psi carb top which will work out to be around 9-10psi carb base, ideally any change in boost and you should get the afr's checked to make sure all good.

Where does the standard boost gauge feed come from?

ben marks

  • 200BHP Senior Member
  • ****
  • Posts: 150
    • View Profile
Re: Boost
« Reply #13 on: 21:12, Wed 28 September 2011 »
Quote from: "denty225"
Quote from: "James5"
14psi carb top which will work out to be around 9-10psi carb base, ideally any change in boost and you should get the afr's checked to make sure all good.

Where does the standard boost gauge feed come from?
The carb top on the o/s

denty225

  • 200BHP Senior Member
  • ****
  • Posts: 230
    • View Profile
Re: Boost
« Reply #14 on: 19:21, Sat 01 October 2011 »
Ok, so is standard boost 11-12 psi at carb top then?