punkoutnz Posted May 13, 2014 Share Posted May 13, 2014 So I'm a bit stuck here, I have a 32dgv weber on my 1300 kent, higher revs are great, but down low, she's a shocker and I can't seem to get it to run right. Mixture screw can't be turned out more than 1/4 turn before it starts to run rough and then stall out. Jets are: F50 emulsion tubes Air: 160/120 Fuel: 120/115 Venutri 3.5/4.5 Those are all main/secondary order. I thought those were the jets for the stock 1300gt so I'm not sure why it's not running right. Can anyone point me in the right direction? I've given the carb a good clean out and nothing has changed. Quote Link to comment Share on other sites More sharing options...
Benno Posted May 13, 2014 Share Posted May 13, 2014 Tried doing a plug chop to see if it is running rich or lean? Does pulling on choke help things at all or make worse? If it's lean, putting that filter on it should help matters Quote Link to comment Share on other sites More sharing options...
punkoutnz Posted May 13, 2014 Author Share Posted May 13, 2014 Nah haven't checked the plugs, I might borrow a mate's wideband to see where the mixtures are at exactly. I guess the jets could have been drilled at some point. The choke butterflies have been removed so can't use that as a reference unfortunately. And yeah that filter might help a little, fingers crossed anyway! Quote Link to comment Share on other sites More sharing options...
azzurro Posted May 13, 2014 Share Posted May 13, 2014 i have a box of weber bits incl jets you are welcome to swapsies with. (on a busy nightclub one in one out basis ) bring to BF tomorrow? we can play carbs. those jettings dont seem to out there. could be the mixture screw is busted, or its seat worn or maybe idle jets too big, or ??? i have same issue on my downie and it runs best wound right in and adjust using the throttle stop. seems bung but it goes fine (mostly) Quote Link to comment Share on other sites More sharing options...
punkoutnz Posted May 13, 2014 Author Share Posted May 13, 2014 The thing I'm thinking at the moment is that the jets may possibly have been drilled out. I didn't check the size of the idle jet but it idles beautifully. The issue starts to come about at light throttle. Once I open the taps right up (and the second throttle opens) it's fine. I thought monthly meet was next week? I'm going to grab another carb I had back off chris cos that has a slightly bigger main jet than what I have in there at 125, though I'm pretty sure it hasn't been touched, so if the problem is worse I know it's too rich, if it's better then I can work my way up some jet sizes. So I'll try that jet and let you know, could be keen to play swapsies if that's okay, cheers for the offer! Quote Link to comment Share on other sites More sharing options...
ajg193 Posted May 14, 2014 Share Posted May 14, 2014 Could be something with ignition advancing issues? Quote Link to comment Share on other sites More sharing options...
punkoutnz Posted May 14, 2014 Author Share Posted May 14, 2014 I don't think so, but hadn't considered that. These issues only came about when I put the new weber on. I'll try disconnecting the vacuum advance just in case. Chur! Quote Link to comment Share on other sites More sharing options...
Ned Posted May 14, 2014 Share Posted May 14, 2014 borrow/buy a wideband so you can actually tell whats up. Tuning without it is a waste of time IMHO. Especially since it's $95 (US + shipping) for a wideband, so would be a good tool to have. Maybe but $20 each together with some mates and buy one is it's still too spendy. It will probably save you that in fuel in a short enough time Quote Link to comment Share on other sites More sharing options...
Benno Posted May 14, 2014 Share Posted May 14, 2014 $95 US + shipping wideband? Where from? All of the decent ones that I've been able to find that include sensor, controller, gauge etc are all around $150 US +. Quote Link to comment Share on other sites More sharing options...
Ned Posted May 14, 2014 Share Posted May 14, 2014 http://www.14point7.com/products/slc-free there is 3 options with sensor. It's actually $85 if you just want a shitty bar graph rather than actual AFR/Lambda values, which is 95 though i just noticed it doesnt have a cable sorry or 115 for the evaluation kit and just put a multimeter on the 0-5v linear signal to figure out whats what if you wanna do it on the cheap http://www.14point7.com/products/sigma-lambda-controller-oem-eval-kit or 160 if you want a gauge too http://www.14point7.com/products/slc-gauge Quote Link to comment Share on other sites More sharing options...
Rookie Posted May 14, 2014 Share Posted May 14, 2014 LOL Ned, hod rodders have been tuning my arse/plug chops for years. Sure wide bands are nice, but they certainly aren't mandatory to make a car run. 1 Quote Link to comment Share on other sites More sharing options...
Rookie Posted May 14, 2014 Share Posted May 14, 2014 You haven't posted up the idle jets dude, what are those? 1 Quote Link to comment Share on other sites More sharing options...
punkoutnz Posted May 14, 2014 Author Share Posted May 14, 2014 I didn't check to see what the idle jet was (idles really nice so hadn't looked). Will check that tonight anyway, along with the vacuum advance. Still on a learning curve with the weber carbs and what affects what. Quote Link to comment Share on other sites More sharing options...
Ned Posted May 14, 2014 Share Posted May 14, 2014 LOL Ned, hod rodders have been tuning my arse/plug chops for years. Sure wide bands are nice, but they certainly aren't mandatory to make a car run. im sure they have, but knowing what AFR your car is running at is hard to tell with your ass dyno and for $100 you can just know, and you can see what changes things make and makes life easy. 21st century is about making life easy, not trying to do shit an old antiquated, less superior way just because we can dave or else you're never allowed to mention LS motor swaps ever again, because hot rodders have been making cars fast without them for years before the LS motor came out Quote Link to comment Share on other sites More sharing options...
Rookie Posted May 14, 2014 Share Posted May 14, 2014 The idle jet is what is the problem. It does much more than just control the fuel at idle. This is reasonably relevant, but just imagine that the green is halved between the main jet and the idle/pilot jet; because you don't have a needle. Quote Link to comment Share on other sites More sharing options...
Rookie Posted May 14, 2014 Share Posted May 14, 2014 im sure they have, but knowing what AFR your car is running at is hard to tell with your ass dyno and for $100 you can just know, and you can see what changes things make and makes life easy. 21st century is about making life easy, not trying to do shit an old antiquated, less superior way just because we can dave or else you're never allowed to mention LS motor swaps ever again, because hot rodders have been making cars fast without them for years before the LS motor came out Dude, it is a stock carb on a stock configuration, it doesn't need a wide band to figure it out. Fluffy, just didn't know there was an extra jet that actually mattered. Also I don't think a wide band would actually make this easy, I bet I could get this running spot on in the time it would take you to weld the bung into the exhaust. 1 Quote Link to comment Share on other sites More sharing options...
Rookie Posted May 14, 2014 Share Posted May 14, 2014 This is a more relevant picture. Quote Link to comment Share on other sites More sharing options...
Rookie Posted May 14, 2014 Share Posted May 14, 2014 This one too. Quote Link to comment Share on other sites More sharing options...
punkoutnz Posted May 14, 2014 Author Share Posted May 14, 2014 The more you know! Sweet that's gonna give me a couple of decent leads to investigate tonight. Cheers man! Quote Link to comment Share on other sites More sharing options...
Rookie Posted May 14, 2014 Share Posted May 14, 2014 According to this they should be 45s, so if they aren't that will be your problem. http://locostbuilders.co.uk/viewthread.php?tid=168222 Quote Link to comment Share on other sites More sharing options...
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