[RobJ]

Hi all,

I'm soon going to be putting extractors and a 2" exhaust on my stock '92 sierra and have read that once that is done the Carb will be the limiting factor.

For a while i was considering changing to a weber but my stock carb has never given me any issues and i don't want to have to give angles a second thought.

I've read on other forums about people swapping the primary and secondary jets in their carbs and stretching the spring so the secondary opens earlier. Unfortunately the people who have done it seem not to be particularly active and i'm still yet to decide whether it is worth the effort.

Has anyone on here done this change? If so, how great an improvement is is to performance, and what has it done for fuel consumption?

Also, Would swapping to the Vitara carb be worthwhile? Is it as reliable on angles as the stock carb?

And finally, Is it worth thinking about Carburetors at all? Or, is there something else i could be doing to get a little more kick out of my 1.3 Sierra?

Cheers

[Rusho]

I got 2inch exhaust and extractors.....mine runs fine with the standard carby..if it ain't broke don't fix it!!!

[shep]

i recon that the only worthwhile power up for a sierra is a vit 1.6

[alex]

RobJ wrote:

Hi all,

I'm soon going to be putting extractors and a 2" exhaust on my stock '92 sierra and have read that once that is done the Carb will be the limiting factor.

For a while i was considering changing to a weber but my stock carb has never given me any issues and i don't want to have to give angles a second thought.

I've read on other forums about people swapping the primary and secondary jets in their carbs and stretching the spring so the secondary opens earlier. Unfortunately the people who have done it seem not to be particularly active and i'm still yet to decide whether it is worth the effort.

Has anyone on here done this change? If so, how great an improvement is is to performance, and what has it done for fuel consumption?

Also, Would swapping to the Vitara carb be worthwhile? Is it as reliable on angles as the stock carb?

And finally, Is it worth thinking about Carburetors at all? Or, is there something else i could be doing to get a little more kick out of my 1.3 Sierra?

Cheers

i have herd people swapping to the Vitara carb but i think you will need the intake manifold as well??? as far as i know they sware by it

[alex]

shep wrote:

i recon that the only worthwhile power up for a sierra is a vit 1.6

not if your on your Ps or Ls

[shep]

i have a sierra carby on a vit manifold so the vit one should fit on the sierra manifold.

[shep]

alex wrote:

shep wrote:

i recon that the only worthwhile power up for a sierra is a vit 1.6

not if your on your Ps or Ls

makes no difference what ya license is where i am.
you could have 10 turbos hanging of a big block chev in a excel and ya could drive it on your Ls

[alex]

shep wrote:

alex wrote:

shep wrote:

i recon that the only worthwhile power up for a sierra is a vit 1.6

not if your on your Ps or Ls

makes no difference what ya license is where i am.
you could have 10 turbos hanging of a big block chev in a excel and ya could drive it on your Ls

Im moving to the Northern Territory now

[shep]

also get your full license at 17 in the nt.

[alex]

shep wrote:

i have a sierra carby on a vit manifold so the vit one should fit on the sierra manifold.

isnt the Diameter of the carby smaller than the manifold???

[alex]

shep wrote:

also get your full license at 17 in the nt.

we can go swimming here

[ball]

shep wrote:

also get your full license at 17 in the nt.

It's changed since you were a lad a couple of centuries ago.

16 for your learners and you have to wait 6 months before you can go for your P's now

I can't remember if they have changed how long you have to be on your P's before getting a full open licence.

[ball]

alex wrote:

shep wrote:

also get your full license at 17 in the nt.

we can go swimming here

You can swim here too.

You just have to be fast !!!!!!

[shep]

ball wrote:

alex wrote:

shep wrote:

also get your full license at 17 in the nt.

we can go swimming here

You can swim here too.

You just have to be fast !!!!!!

or at least faster then your mates.

open license is at 17.5

[royce]

Steve or Nissvit posted a fair bit of detail in rejetting a sierra carb on here somewhere, makes a huge difference

gypsy on here has a 1.3 with mild tighe cam, exhaust and rejetted carb and its pretty nice to drive, will in a straight line on a smooth road at least

[alex]

royce wrote:

Steve or Nissvit posted a fair bit of detail in rejetting a sierra carb on here somewhere, makes a huge difference

gypsy on here has a 1.3 with mild tighe cam, exhaust and rejetted carb and its pretty nice to drive, will in a straight line on a smooth road at least

found it: http://www.auszookers.com/index.php?nam ... ight=carby

[gypsy]

ok mine has mild cam $110 well spent 110 jet and 120 jet. Can do 130kmh in 5 gear goes good any where i drive it and even better off road. And it smokes 31 lol

[RobJ]

alex wrote:

royce wrote:

Steve or Nissvit posted a fair bit of detail in rejetting a sierra carb on here somewhere, makes a huge difference

gypsy on here has a 1.3 with mild tighe cam, exhaust and rejetted carb and its pretty nice to drive, will in a straight line on a smooth road at least

found it: http://www.auszookers.com/index.php?nam ... ight=carby

That page makes it sound like the stock jetting is just right the way it is.

So do you think Cams are the way to go? If you could point me in the direction of some of the better topics regarding the options, it would be very much appreciated

Thanks for the replies all and by all means keep them coming!

[gypsy]

cams are the way to go. Mild cam and 110 120 jets cant go wrong

[Rockhopper]

gypsy wrote:

cams are the way to go. Mild cam and 110 120 jets cant go wrong

when you say mild cam, where is the powerband?? There are two cams readily available for a 1.3 and I've been contemplating this myself as my 1.3 is in too good a condition to get rid of for the moment. One cam I've found has the power band between 1000 - 4000 rpm. The other one is between 2000 - 5500 rpm. At this stage I'm thinking the 1000 - 4000 rpm one, as the only time I go above that is when I'm going up a hill on a highway and have to drop it down a gear to keep the speed up. With a bit of extra oomph, I figure I won't need to change down as often.

[gypsy]

mine is a custom grind tighe cams did it comes in about 3200 if u tell them what u want they will make it happen

[Scrawny]

I've got a re-jetted secondary, extractors and 2" exhaust. It goes really well!! Thoroughly recommend at least re-jetting secondary and see how you like it.

Re-ground cam sounds interesting!! hmmmm....

[RobJ]

Who did you go to for you cams Gypsy?
The only site i've been able to find is
http://www.camtechcams.com.au/cat/suzuki.html
but i remember stumbling across another website a while ago but can't find it anymore.

I think they offered two types of cam for a sierra, but just can't find their site.

[gypsy]

tighe cams

[RobJ]

Do you think 105 and 120 jets would be too rich if i didn't change the cams?

Also, how much of a hassle is it to re-tune the carb after you change the jets?

(i've never had to touch a carb before and am pretty new to the mechanical world) If i can't get it retuned properly, how much will it cost to get it done professionally?