street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
|
|
Aug 26, 2005 23:10:46 GMT
|
Can anyone direct me to a site thats dedicated to turbochrging with carbs........ i found a really good one a while back that went into some detail but i cant find it again the site showed the progress of someone doing his own DIY dirt cheap project ;D Want to read up on the whole draw through/blow through malarkey, so if anyone has any useful snippets of info i would be dead interested ;D
|
|
|
|
|
|
|
Aug 27, 2005 11:54:16 GMT
|
|
|
2001 HONDA CT110 (NOT RCV)
|
|
slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
|
blow through turbo????slater
@slater
Club Retro Rides Member 78
|
Aug 27, 2005 13:39:58 GMT
|
vizards 'tuning the a-series engine' book has loads on turbo conversions, has ac hapter called suck vs blow iirc
|
|
|
|
|
|
Aug 27, 2005 14:46:19 GMT
|
|
|
Last Edit: Aug 27, 2005 14:47:11 GMT by Blown_Imp
|
|
|
|
Aug 27, 2005 18:22:50 GMT
|
Got no links I am afraid but from what I remember talking to someone who was building a turbo pinto you need two have a carb with a vacuum secondary. Like a weber DGV. I guess the reasoning behind that is as the boost increase it gives an increase in fuel which you wouldnt get from a mechanically opening second barrel. Bigger jets also required for the second barrel. You should be able to get a rough idea of how much bigger they need to be if you compare the jet sizes of renault 5 1.4 and an r5 gt turbo as they had the same carb fitted. Not much help I know but its something I havent tried yet. If you do find a source of info let me know as I have a MK2 escort with a 2.1 and a load of spare DGV`s waiting to be played with ;D ;D ;D
|
|
|
|
|
|
Aug 27, 2005 18:25:46 GMT
|
hey street, has dean got a new ride yet?
|
|
"quote hairnet"
I'm not paying nine pound for a pi$$!
[/quote]
|
|
|
|
Aug 27, 2005 18:40:09 GMT
|
Would a metro turbo setup (carb AND turbo) fit the shuv?
Single carb on there, 6 port like the A series, 1256cc...
Hmmm....
*n
|
|
Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
|
|
|
|
Aug 27, 2005 18:44:40 GMT
|
don't know if a 1256 could stand forced induction always thought the little ends were a bit weak. Could be worth a try though.
If it all goes wrong you know its time for an XE ;D ;D
|
|
|
|
|
|
Aug 27, 2005 18:46:07 GMT
|
hey street, look for a turbo technics xr2 kit, it bolts on to carb...
|
|
2006 Audi A3 2003 Fusion 2 looking for a project....
|
|
street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
|
|
Aug 27, 2005 19:13:28 GMT
|
Thanks guys for the links and info ;D ;D ;D Yeah i should have a look at the R5 GT turbo's, forgot all about those little rockets, i'll have a look see at what they use, pretty sure they utilize a garret T2 but upgrade to T3's....... id be interested to find out what psi they put through the weber DGV
|
|
|
|
|
street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
|
|
Aug 27, 2005 19:20:09 GMT
|
Got a pair of dellorto sidedraft 40's which i fancy using- apparently the Lotus esprit Turbo blows through a pair, but they are special turbo specific versions of the carb..... trying to find out what makes them turbo proof and if i can modify mine to suit mrsigma- Yeah deans sorted out a new ride whilke he was 'daaan saaaf', wont say too much but from what hes said it sounds sweet as I'm jealous already without seeing it!! Did you hear what happened to his scort?!?
|
|
|
|
|
|
Aug 27, 2005 20:05:11 GMT
|
to make the carbs turbo proof, they have special spindle seals, and boost going to the float chamber. This will increase the fuel pressure as the boost rises and so richen the mixture. Also put a small restrictor after where you get the boost signal for the float chamber, this will make the fuell increase a little richer and possibly save the engine. THe metro turbo carb is the best one to go for as it has all these features built in, it is also good for about 200-220bhp possibly more but that is the max i have seen out of one. Make sure you get a good intercooler, this again can save the engine from detting its tits off!
what car is this for? what size is the engine?
cheers J
|
|
|
|
street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
|
|
Aug 27, 2005 22:22:05 GMT
|
Its for the escort, I'm building a 2ltr zetec turbo ;D but i don't want the fuel injection, its got to be carbs! I could just throw in an RSturbo lump, but thats just not my way. I'm working on the princaple that the lotus esprit was a 2.2 twink running dellorto 40's and T3 turbo, therefore this setup should be able to work on a 2ltr zetec ;D I figured how i can get the boost to the float chambers, but ive heard that the spindles are pretty turbo proof as they're ball bearing and quite well sealed. I read elsewhere that if you replace all the gaskets with butyl rubber ones it can take around 10PSi. Or alternitively buy a rebuilt kit for dellorto turbo carbs I'm worried about the hollow plastic floats crushing though...... trying to get the lowdown on the turbo specific dellorto version to see what they have, but havent found anything yet! I'm not fully understanding the restrictor bit, can you elaborate? Thanks for your help!
|
|
|
|
|
|
Aug 27, 2005 22:30:10 GMT
|
Find someone who owns/works on a Lotus turbo...
The Metro Turbo setup is a pretty low-boost affair from the off isn't it? 4-7psi?
*n
|
|
Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
|
|
|
|
|
Yeah but they are good for 20+psi go have a look at the mini williams, i think hes craking on for 230bhp now! As with anyhting the carbs will have to be tuned to that engine to work really well, but it will work straight off! It will be much easier to get the motero set up working than it will the weber setup. On a zetec tho i would go for twin mtero turbo carbs, that would easily flow enough as one might be at its limits rather quickly ;-) If you are quick there is a T3 from a lotus going on ebay at the mo, wold work perfectly! cgi.ebay.co.uk/Lotus-Esprit-Turbo-81-87-Turbocharger-Garrett-T3_W0QQitemZ4571269715QQcategoryZ27375QQssPageNameZWDVWQQrdZ1QQcmdZViewItemAs for the restrictor, the float chamber wants to see the boost pressure so that the fuel wont flow the wrong way. If there is a restrictor at the mouth of the carb, before the jet, but after the line that pressureises the float chamber, the float chamber will get a little more pressure than the carb will see. This is because the restriction causes a slight pressure drop so lets say before it will be 15psi and after it will be 14.5psi, this will cause the float chamber to have a .5psi rise over the boost at the engine and so you will get fuel enough for 15psi and so run a slightly rich mixture. Hope that helps
|
|
|
|
street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
|
|
Aug 28, 2005 12:51:06 GMT
|
Aaah i see now, thanks blownimp ;D The thing about the metro SU's is the manifold, i'd have to fab one up where as the dellorto's i have an inlet manifold already. Plus i got to source the carbs, where as i already have the dellorto's I'm watching that Lotus T3, although i passed up the chance of getting one off the bay for £20 missed it by a few minuites Ive found a site listing the exact spec of the Lotus dellorto's, but it says nothing about the floats bieng different, just the weight Maybe they're not different??
|
|
|
|
|
|
Aug 28, 2005 12:58:23 GMT
|
Normal floats can collapse under the pressure, the SU turbo ones are heavy gauge plastic. Mabe it is the same for the dellortos? It ma be possible to convert then just using a rebuild kit for the esprit turbo carbs?
J
|
|
|
|
|
|
Aug 28, 2005 13:00:56 GMT
|
WHy are you insisting on carbs? In my experience (admittedly not vast) turbos and carbs do not mix very well, 'spesh with the advent of cheapo DIY fuel injection. coughing spluttering bad hot or cold starting, mixture going out of tune.... yuk.
|
|
1972 Fiat 130 1985 Talbot Alpine 1974 Lancia Beta Saloon 1975 + 1986 Mazda 929 Koop + Wagon 1982 Fiat Argenta 2.0 iniezione elettronica 1977 Toyota Carina TA14 BEST CAR EVER!!!!!!!! 1979 Datsun B310 Sunny 4-dr 1984 Audi 200 Quattro Turbo 1983 Honda Accord 1.6 DX GONE1989 Alfa 75 2.0 TS Mr T says: TREAT YO MOTHER RIGHT!
|
|
|
|
Aug 28, 2005 13:04:50 GMT
|
I never have any hot or cold starting problems, and the only mixture troubles ive had is the filter getting plugged up and the float running dry!
Carbs are easier for the initall up and running
J
|
|
|
|
street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
|
|
Aug 28, 2005 13:33:51 GMT
|
Ive looked long and hard at the injection option, megasquirt, modified cosworth EFI systems etc etc. It works very well, but its all been done so many times with the zetec, its almost modding by numbers now that certain places such as www.oddkiddcreations.co.uk have got it down to a fine art. Their way of turboing zetecs is hard to beat, but i really do want to do something a bit different with these engines ;D I think if done correctly, carbs and turboes can get along famously, its just a case of doing your homework. Also i reckon it will be cheaper using carbs in my particular case as i have most of the parts already. No faffing around with mounting sensors and injectors and such like. I spose its also because i understand carbs much better than injection. I like to SEE how something works, and with injection i feel like id be putting alot of trust in something i have little faith in... me and computers don't really mix. Altering jets and chokes is something I'm much more comfortable with ;D
|
|
Last Edit: Aug 28, 2005 13:34:40 GMT by street
|
|
|