For the past week my older brother has been giving me some ideas on how to improve the performance of my TP. One of his ideas is to put the biggest webber i can on it. He went down to re-carb and they said the best Webber to put on it is a 40mil webber ($650 reconditiond) or i could go to a few wreckers and try to get a second hand webber and get my brother to recondition it.
My question is, how much performance would i get out of it and what kind of fuel econamy am i looking at and my final question... Is it worth it?
thanks.

problem with weber is jetting
the webber is ok for a manual / more to do if an auto
the accelerator cable
the choke
the webber doesnt have coolant running through it
getting the adaptor plate

BCX7 has a link http://www.aussiemagna.com/forums/showthread.php?t=51336

well its a manual, my older bro has put a few carbys in before so he knows what hes doing (acc cable etc) we can ger the adaption plate from re-carb..
do you know around about how much power gain i would get?

thanks, were just going to get people at re-carb to tune it. should be all good.

less carby probs allround

and better performance /dont know the figure

iff the carby stalls as you go around a corner the jetting is wrong


mmm i thought it was the float not the jetting that made it cut out around the corner.

Beast do a search cos it been covered a fair bit.
TM terror has one on his tm challenger

http://www.aussiemagna.com/forums/showthread.php?t=15713&highlight=webber

http://www.aussiemagna.com/forums/showthread.php?t=16592&highlight=webber

http://www.aussiemagna.com/forums/showthread.php?t=31195&highlight=webber

http://www.aussiemagna.com/forums/showthread.php?t=18161&highlight=webber

so at the end of the day the jets aren't that big of a drama. even if there wrong it will run just not well (chews the fuel , lumpy idle). Plus u can't re-jet in the car if you want.
The float seemed to be the problem with cutting out around corners seeing as the carby/bowl is in a different spot than on the 4.1 250ci , so when u hit a corner with speed the fuel would be pushed to one side make it stall.
The search button is there and most of your question have been asked in the past:D

As for power you will be lucky to gain a kw or 2. I'ts like changing a paper air filter for as K+N filter the gain of power will be pretty much nothing but cos it breaths better and revs more freely you think it has more power when really it's just a placebo.
So unless your dumping 10 grand to turbo it or super charge little things like that won't give you much in power. But it will be more fun to drive.

mmm i thought it was the float not the jetting that made it cut out around the corner.

Beast do a search cos it been covered a fair bit.
TM terror has one on his tm challenger

http://www.aussiemagna.com/forums/showthread.php?t=15713&highlight=webber

http://www.aussiemagna.com/forums/showthread.php?t=16592&highlight=webber

http://www.aussiemagna.com/forums/showthread.php?t=31195&highlight=webber

http://www.aussiemagna.com/forums/showthread.php?t=18161&highlight=webber

so at the end of the day the jets aren't that big of a drama. even if there wrong it will run just not well (chews the fuel , lumpy idle). Plus u can't re-jet in the car if you want.
The float seemed to be the problem with cutting out around corners seeing as the carby/bowl is in a different spot than on the 4.1 250ci , so when u hit a corner with speed the fuel would be pushed to one side make it stall.
The search button is there and most of your question have been asked in the past:D

As for power you will be lucky to gain a kw or 2. I'ts like changing a paper air filter for as K+N filter the gain of power will be pretty much nothing but cos it breaths better and revs more freely you think it has more power when really it's just a placebo.
So unless your dumping 10 grand to turbo it or super charge little things like that won't give you much in power. But it will be more fun to drive.




thanks for that. well if its going to chew fuel, cut out around corners and only give me 1-2kw it doesnt sound like such a good idea.
the main reason i was gonig to change it over was because i was told it would give me a fairly large power gain

thanks for that. well if its going to chew fuel, cut out around corners and only give me 1-2kw it doesnt sound like such a good idea.
the main reason i was gonig to change it over was because i was told it would give me a fairly large power gain
It's still going to give a better improvement over the Mikuni, more reliable once set up.

ok then, my brother said it will give a huge improvment, higher speeds, faster acc said it should drop down from 11 to around 9 or so?

Can't tell you, never done the mod. (I'm an injection boy, not a carby boy)

alrighty then, thanks anyway. hopefully somebody else can give me abit of an insite on performance improvment

hahaha where do i get this magical wonder carby?

i might put one on the TJ!!! lol


you brother tells you some tall stories!

if you had a reco factory carby tuned to factory specs running 100% and were to put on a webber, you would see no more than 5hp at WOT max, then you would loose choke and proably a few other nice features of the factory carb when it's running well

something that will give you real gains that you can write home about would be an efi conversion

sure carb is going to cost you $400 or so give or take.... and that a 2nd hand carb! or $650 as you say for a reco carb then there is the fuel line no choke and the acc cable to set up as well as the adaptor plate and air cleaner, lots of time and no change from $800

A whole efi car would cost you the same then transfer you old bits on to that and sell it and all up it's only cost you a hand full of $$ and time...

then its happy days!

haha fair enough. might give it a miss then.

when it's running well
:bowrofl: :bowrofl: A Magna carb? Running well?:gtfo:

as someone who as ACTUALLY done the mod, i'll give you all spill about it seeing as there seems to be a lot of BS in this thread. I'll break it down to some dot points for ease of reading.

*the stalling around the corner is solved by adjusting the float. has absolutely nothing to do with jetting. i have solved this problem by adjusting the float. it is true the carby sits the wrong way and upsets the float.

*jetting can be done with the carby on the car. it involves taking the top cover off the carby and changing them.

*Putting this weber on my car was possibly the best mod i have ever done. i went from a 14-15 second 0-100kmh time to a sub 9 second time. keeping in mind that my car is also an automatic. more than the estimated 1-2kw figure that people have pulled from somewhere and it is certianly not a placebo.

*futhermore, i can smoke up 215/45R17 with ease in the dry, and if i kick back to second at around 80, the car breaks into spin in the wet. (once again taking note my car is STILL automatic)

*i can beat in drags VN, VP auto commodores, and keep up with a VY ute to the drivers surprise.

*I eliminated the choke so i could mount my TPS bracket, but even without the choke, the car isn't too bad in the mornings

*One coolant hose just needs to be blocked, as the weber does not use coolant for it's choke.

*I am yet to rejet my carby, i am using the jets that came off the falcon (4.1L auto XF). the jets seems reasonably spot on. however, this is with a cam, extractors and balance shaft elimination. on a stock motor, the gains will not be as much for power, but also the jets will run too rich. I will guarentee you that you will not regret getting rid of the mikuni heap of ****

*Custom bracket needs to be made up for the throttle cable. took me about 30 or so mintues and an arc welder to make my TPS and the cable. if your taking it somewhere to be done, they will sort something out. also if your car is manual, then you dont even need the tps.

*fuel enconomy for me has been pretty much the same - provided i drive sensibly. i once upon a time rebuilt my mikuni and that carby used to run spot on. so it's not the fact that my old carby wasn't working correctly. the mikuni carby is just crap.

*As soon as the secondaries open up, you can watch your fuel guage go down real. but you can feel the secondaries through the pedal so you can control when they open up. as i said, if you drive sensibly, the fuel economy will be fine.

something that will give you real gains that you can write home about would be an efi conversion

i beg to differ... there are plenty of sigma and galant guys that use the webers and are getting very good results.


sure carb is going to cost you $400 or so give or take.... and that a 2nd hand carb! or $650 as you say for a reco carb then there is the fuel line no choke and the acc cable to set up as well as the adaptor plate and air cleaner, lots of time and no change from $800

$38.50 for second hand carby, $50 or so for rebuild kit, $28 for adaptor plate.... no where near $400...

Thanks Bill, knew you'd be able to answer the questions.

Thanks Bill, knew you'd be able to answer the questions.

gav, you remember how nuts fossel's car was?

he went through 5-6 transmissions... both a mix of autos and manuals.

Fossel never rejetted his carby when he first put it on, but also had a nuts cam and extractors.

I'm with BCX7 on this one, when I first went for a test drive in His car after He put the webber on His, the difference in power quickly puts a smile on my face.

With a full car load of people his 17s were shredded with smoke everywhere while just under acceleration (no e-brake usage). :shock:

I was surprised to see how much of a power increase it had given, and safe to say it was across the whole rev range. And if you shut the windows and turned the stereo off, and opened the air vents, when the secondaries opened you could hear it as clear as day sucking in the earth.

Puts my car to shame.

gav, you remember how nuts fossel's car was?

he went through 5-6 transmissions... both a mix of autos and manuals.
Yeah, I have no idea how he kept killing the manuals, especially the TP boxes.

As someone who has stuck with the magna carby since I first bought the car, I can give it wraps, and I can also give a list of it's flaws, having said that, any car I've driven I could nit pick.

The weber upgrade on a magna carb series engine is a cheap, reliable, and hella good upgrade.

Fo55el def was the envy of all who had a magna, still with an astron strapped in it, as well to the fact of running a carb.

I find it more funny, when people tell me it can't be done, spec with 40 yrs experience... ignorant decades for damn sure.

anyone looking to keep the carb, it's a damn good, cheap, efficient ( for power and cost) upgrade.

Only reason I'm no longer doing it is cause it's all to common now, and I'm going a completely diff route which should be done in months to come.

But mmm, Carby FTW

as someone who as ACTUALLY done the mod, i'll give you all spill about it seeing as there seems to be a lot of BS in this thread. I'll break it down to some dot points for ease of reading.

*the stalling around the corner is solved by adjusting the float. has absolutely nothing to do with jetting. i have solved this problem by adjusting the float. it is true the carby sits the wrong way and upsets the float.

*jetting can be done with the carby on the car. it involves taking the top cover off the carby and changing them.

*Putting this weber on my car was possibly the best mod i have ever done. i went from a 14-15 second 0-100kmh time to a sub 9 second time. keeping in mind that my car is also an automatic. more than the estimated 1-2kw figure that people have pulled from somewhere and it is certianly not a placebo.

*futhermore, i can smoke up 215/45R17 with ease in the dry, and if i kick back to second at around 80, the car breaks into spin in the wet. (once again taking note my car is STILL automatic)

*i can beat in drags VN, VP auto commodores, and keep up with a VY ute to the drivers surprise.

*I eliminated the choke so i could mount my TPS bracket, but even without the choke, the car isn't too bad in the mornings

*One coolant hose just needs to be blocked, as the weber does not use coolant for it's choke.

*I am yet to rejet my carby, i am using the jets that came off the falcon (4.1L auto XF). the jets seems reasonably spot on. however, this is with a cam, extractors and balance shaft elimination. on a stock motor, the gains will not be as much for power, but also the jets will run too rich. I will guarentee you that you will not regret getting rid of the mikuni heap of ****

*Custom bracket needs to be made up for the throttle cable. took me about 30 or so mintues and an arc welder to make my TPS and the cable. if your taking it somewhere to be done, they will sort something out. also if your car is manual, then you dont even need the tps.

*fuel enconomy for me has been pretty much the same - provided i drive sensibly. i once upon a time rebuilt my mikuni and that carby used to run spot on. so it's not the fact that my old carby wasn't working correctly. the mikuni carby is just crap.

*As soon as the secondaries open up, you can watch your fuel guage go down real. but you can feel the secondaries through the pedal so you can control when they open up. as i said, if you drive sensibly, the fuel economy will be fine.

thanks that was a HUGE help. should of came straight to you in the first place ay lol
maybe i will put it on. if theres a power again as you said and if i can control my foot then it should be all good (fuel usage)

thanks that was a HUGE help. should of came straight to you in the first place ay lol
maybe i will put it on. if theres a power again as you said and if i can control my foot then it should be all good (fuel usage)

i got a huge benfit from the carby as i had a cam and extractors... done expect too much if you dont have the extra mods but it should be better than the mikuni carby and will pave the way for mods later down the track.

you already have the extractors? thats probably the most expensive out of the mods out of the way... after you got the weber on and your still chasing power, go for a cam and jet the carby tuned again.

I reckon you will feel the difference even in a stock motor. The extra fuel and better mix will have the motor singin through the whole rev range, I say go for it.:badgrin:

yeah already got the extractors, my brother (Steve) said i should still do the rest of the exhaust, 2"-2 and a quarter inch pipe, something to do with back pressure.
if i get the webber from Re-carb it will come with a "sports" filter and just about everything else except the adaption plate for around $650 or so... or i could get get a second hand one for god knows how much and get a carby kit (cleaner etc) for $50 and get steve to clean it as i know little about cars. then we'll put it on and take it to Re-carb abd they can tune it... for a price..
is there anything else i need... should do???

ive decided to go with a 38mil webber. $650 new and installed

keep us updated... should get it dyno'd before and after just to show how much good carbys can give.... and a good tune.:D

ill keep everyone up to date. but i wont be doing it till the start of next year as my money is being used for a holiday. but once its done ill post details

yeah if this works well for you it might be sumthing i might consider sumtime next year also