carb 2nd stage mod.? [Archive]

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raj

29-09-2009, 23:22

is there a detailed guide on how to go about doing this?

ill be buying my afr setup pretty soon so would like to know the ins and outs of what to do.
also what afr's should i be aiming for etc?

Spooky

30-09-2009, 09:56

raj

30-09-2009, 10:46

2nd stage can easily be cocked up as its fixed so be careful.

unless you go down the 'drill it out/helicoil and have removeable jetting' route :D

aim for 12.1-12.5 afrs on boost.

what boost you aiming for raj? 18lbs i take it...:coffee:...:p

yes mate, im aiming for around 18psi Max.

so, no guide to doing this?

not heard of the helicoiling method but sounds good to be able to remove the jets:agree:
question is,once the original jet has been removed,what jets are available to fit? where to buy etc?

i could possibly get a friend who is a prcision engineer to drill and tap/helicoil the original 2nd stage jet, so its just the jets that would be the problem.

im after some more info on the 2nd stage in general before i go faffing around with it.

RAGOONEY

30-09-2009, 10:47

This is a mod I will be tackling very soon too! Just getting the boss welded into the downpipe first.

After reading many threads on this I will be starting with a 1.2 2nd stage for around 18psi and seeing what afrs like on WOT.

This has made me think of a question.......If it runs lean would I drill the 2nd stage to 1.3? or get a bigger main jet? or smaller air corrector? same question applies for if it runs rich.:)

TrixNFlix

30-09-2009, 11:16

Raj pm james5 he knows all about the second stage. :agree:

James5

30-09-2009, 12:19

Solex 32 Dis - 2nd stage drilling

Tools required

Spare A/c jet is required,
Tap - size M4 x .7
Drill bit -size 3.3
Drill bit size 4mm (This is used to enlarge the top part of the 2nd stage hole as the a/c jet is not threaded all the way up and bigger at the end).
Small 3mm flat headed screwdriver,
Drill with variable speed (Slow),
Plenty of carb cleaner,
A steady hand is also required.
Remember if you do decide to fully drill out the 2nd stage non-removable jet, any mistake renders the carb pretty much scrap. I would personally just enlarge the non-removable jet to suit, and if this gets to big (over 1.4) then would consider drilling & tapping an a/c jet in place.

http://i252.photobucket.com/albums/hh25/GTTJames/Solex%2032%20Dis%20Carbs/th_MVI_3306.jpg (http://s252.photobucket.com/albums/hh25/GTTJames/Solex%2032%20Dis%20Carbs/?action=view&current=MVI_3306.flv)
http://i252.photobucket.com/albums/hh25/GTTJames/Solex%2032%20Dis%20Carbs/IMG_3311.jpg
http://i252.photobucket.com/albums/hh25/GTTJames/Solex%2032%20Dis%20Carbs/IMG_3314.jpg

raj

30-09-2009, 13:07

thanks for that james:agree:

what size is the std 2nd stage jet?
i think ill go for drill the fixed jet:agree: if i mess up its on with removing it.

James5

30-09-2009, 13:08

thanks for that james:agree:

what size is the std 2nd stage jet?
i think ill go for drill the fixed jet:agree: if i mess up its on with removing it.

Standard size it is 1.00

raj

30-09-2009, 13:12

Standard size it is 1.00

and in what increments should i drill.?

James5

30-09-2009, 14:03

and in what increments should i drill.?

.5 increments

DaveMayGTT

30-09-2009, 14:10

.05?

James5

30-09-2009, 15:04

.05?

:agree::ashamed:

Spooky

30-09-2009, 15:54

J, is there not enough room to squeeze a helicoil in there?

I've drilled mine out to 1.3mm but may go down that route.

James5

30-09-2009, 16:04

J, is there not enough room to squeeze a helicoil in there?

I've drilled mine out to 1.3mm but may go down that route.

To be honest once you have drilled and taped the hole large enough there is definatly not enough room to put a helicoil screw thread in it.

Spooky

30-09-2009, 16:20

To be honest once you have drilled and taped the hole large enough there is definatly not enough room to put a helicoil screw thread in it.

Cool beans :agree:

I didn't think there was, just needed a 2nd opinion otherwise I'd have had another 'wanted post' up :laugh:

Miller

30-09-2009, 16:41

Hi Raj

Have a read at this......

http://www.rtoc.org/boards/showthread.php?t=4734

Then......

http://www.rtoc.org/boards/showthread.php?t=4761

Their is some more stuff in the articles section

Chris:)

scratcher

30-09-2009, 18:32

Whilst this topic is up... I've read before about simply swapping the enrichment jet and a/c jet.
Has anyone tried this and what was the outcome?

Brigsy

30-09-2009, 18:36

Whilst this topic is up... I've read before about simply swapping the enrichment jet and a/c jet.
Has anyone tried this and what was the outcome?

If you mean swapping the 1st stg jet for the a/c jet, its totally crap. Comedy black smoke out the exhaust & super rich afr's. Fuel economy? forget it;)

James5

30-09-2009, 18:36

Whilst this topic is up... I've read before about simply swapping the enrichment jet and a/c jet.
Has anyone tried this and what was the outcome?

The 2 jets are interchangeable but you don't want to touch the 1st stage jet.

If the 1st stage jet has been increased in size it will get to rich when you give it alot of throttle just before boost comes on. Some tuners used to swap the jets around with the a/c fecking cheap skates. Thus makeing the fuel curve horrible.

Spooky

30-09-2009, 19:24

RESULT...I was just fishing about in my spares and completely forgot that I've got about 4 tubs worth of carb spares which I thought were junk...well...I only stumbled across a spare carb body with a removeable 2nd stage didnt I!...awesome :D

scratcher

30-09-2009, 19:48

Ok, cheers James & Brigsy. I'll leave those well alone :agree:

Kris M

30-09-2009, 20:31

Spooky

30-09-2009, 20:33

You didnt ask, more so, come over :cooter: