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Feb 21, 2011 15:47:26 GMT
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I know some people have done it & being quiet at work gives me time for silly ideas. I have sat in the shed feeling sorry for itself my other Starlet, which I think is desperate for some forced induction. I've never even worked with a turbo before, so it's going to need some research before I start the proper work! So, what do I need? From what I gather so far: Turbo & homemade adaptor to mount in on the exhaust manifold Carb that can take being force fed (already got one of a Charade turbo?) Oil feed for turbo tapping into the sump. Intercooler if I can find the space. Pipework from turbo to top of carb (via intercooler if fitted) What about fueling? Just a case of fitting a rising rate pressure regulator, or do I need more than that? How do I keep an eye on the amount of boost? I've read 10psi tops, but how do I control that? Any help gratefully recieved!   |
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Feb 21, 2011 16:15:58 GMT
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This comment may seem out of turn in these circles but have you considered efi???
I know carbs are preffered in these parts but they do make things difficult...
My first thought would be to see if I could make the 1.3 turbo from the newer starlet fit straight in.
If this is a loooong term project maybe even a mr2/celica turbo upgrade, loads of work but if its not the daily and you got the time then might as well go mental...?
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skinnylew
Club Retro Rides Member
Posts: 5,546
Club RR Member Number: 11
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DIY Turbo conversion?skinnylew
@skinnylew
Club Retro Rides Member 11
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Feb 21, 2011 17:44:42 GMT
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Far be it from me to shoot down the idea of turboing an engine (see my sig I'm doing it to an Ax GTi!) but the Staarlet came with a Turbo engine through various guises of its lifespan. Would be less hassle and easier to throw one of these in surely! And they are quick when fettled as well, i had one pushing my Octavia vRS very hard indeed the other day when i was down in Canterbury! Couldn't pull away one bit!
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Feb 21, 2011 18:56:06 GMT
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Why would a carb make it difficult on a car that already runs a carb? More work surely converting to efi, with sourcing suitable injectors, ecu & accociated wiring etc?
The fwd turbo starlets are a very difficult conversion. Cracking cars & good for 300bhp but because of the wiring & that there's no RWD box that fits doesn't make it straight forward at all.
Wouldn't want to go for a bigger engine either & have to cut the bulk head as then it'd be a modified monocoque & into BIVA etc?
People have done it, just wanted general DIY turbo conversion advice really.
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Feb 21, 2011 19:14:07 GMT
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have a look on skogenracing: skogenracing.editboard.com/f12-english-forumtheres loads of stuff on there on turboing n/a engines theres a really simple one with extra injectors fired with a pressure switch when on boost and standard fueling the rest of the time. |
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stealthstylz
Club Retro Rides Member
Posts: 14,845
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DIY Turbo conversion?stealthstylz
@stealthstylz
Club Retro Rides Member 174
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Feb 21, 2011 19:33:21 GMT
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Make an inlet manifold to mount a carb that will take boost. Easiest i've seen are Renault 5 turbo carbs or modify an SU to take boost. Make an exhaust manifold with a turbo flange. For fuel run a pressure regulator which is fed boost pressure to one side of the diaphragm so that the pressure rises as boost rises. Only expensive bit is buying a wideband lambda kit to set it up properly.
Matt
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Feb 21, 2011 20:07:24 GMT
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Make an inlet manifold to mount a carb that will take boost. Easiest i've seen are Renault 5 turbo carbs or modify an SU to take boost. Make an exhaust manifold with a turbo flange. For fuel run a pressure regulator which is fed boost pressure to one side of the diaphragm so that the pressure rises as boost rises. Only expensive bit is buying a wideband lambda kit to set it up properly. Matt so tell me more. how do you go about modding an SU to take boost?? and whats the best way to get around the timing? doesn't it need to be retarded when on boost? always wanted to do a DIY turbo setup.. and my fiesta might just be the right candidate for the job ;D |
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stealthstylz
Club Retro Rides Member
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DIY Turbo conversion?stealthstylz
@stealthstylz
Club Retro Rides Member 174
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Feb 21, 2011 20:26:51 GMT
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IIRC you have to feed boost into the float chamber and switch a couple of seals round so they don't leak. Not done it myself but its what i'd use now, as 5 turbo and BL turbo carbs are like gold dust.
Matt
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Feb 21, 2011 20:35:50 GMT
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I've got an early Charade turbo carb, so that can take boost as it is & that is a direct fit onto a Starlet inlet manifold, so that's the easy bit (although jets might need changing, but no major issue there)
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stealthstylz
Club Retro Rides Member
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DIY Turbo conversion?stealthstylz
@stealthstylz
Club Retro Rides Member 174
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Feb 21, 2011 20:44:26 GMT
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Just need an boost referenced pressure regulator and an exhaust manifold and you're nearly there then. Oh and an intercooler.
Matt
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Feb 21, 2011 21:04:18 GMT
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Sounds good to me!
This isn't going to happen (if at all) until next winter as my busy work time is just starting, leaving little time for a project like this. Gives me time to make the money to buy the parts to do it though.
Thanks for your help Matt.
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Feb 21, 2011 21:17:25 GMT
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High pressure fuel system
Return line to the tank
Boost referenced FPR
SU carb + inlet manifold with the dash pot sealed and fed boost from the manifold, a restrictor ring needs to be fitted into the carb inlet before the needle, the float bowl then needs boost pressure from the plenum piping to it. What this will achieve is a difference of around 3 psi between the float bowl and the jet/throat of the carb, resulting in a boost referenced fuel supply.
Then simple bolts on's -
exh adaptor
turbo with built in wastegate
intercooler
oil supply from low pressure light feed
Oil drain to brazed sump fitting (must be above oil level)
pipework
clamps
All good fun!
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Feb 21, 2011 21:19:09 GMT
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I don't wish to speak out of turn but my origional post never mentioned converting the origional engine to efi but indeed choosing a new efi engine over the origional carb setup. I think this is due to my age and having absolutly no idea how carbs work. I just assumed there were more tuning options available to efi than carbs.
I can see how converting the fwd starlet engine to rwd could be difficult.
Keep us posted and good luck with the build.
Alex
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Feb 21, 2011 21:29:54 GMT
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Feb 21, 2011 21:30:21 GMT
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Depending what your exhaust fannymould looks like, it may be easier to use a standard cast-type manifold, and make a bolt-on adaptor to fit the turbo straight onto the end of that, rather than spend weeks making a "proper" style manifold, resembling medusas head on a bad hair day... Sure, it may lose you 3-4Bhp, but it would be a damned sight easier to make! If you can weld well, making pipes isn't too hard. If you can't... don't attempt it, just buy pre-bent bits, and sillicone tubing. Will save a lot of tears in the long-run when you try for the tenth time to stop that leaky weld from letting all your boost out! For ease, try it without an intercooler at first (less piping to worry about) and when it's running nicely, slap one on, and then deal with the problems associated with that AFTER you know it'll run! Keep your job list small, and don't try to do too much, too quick, or make the "perfect" setup first time round, as we all know that NEVER happens  |
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You're like a crazy backyard genius! |
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Feb 21, 2011 21:47:20 GMT
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You should not use silicone pipes in direct contact with fuel or fuel vapour, as it will rapidly degrade resulting in splits and leaks. It can be obtained with a flurocarbon liner which will make it fuel proof however.
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Feb 21, 2011 22:42:46 GMT
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stealthstylz
Club Retro Rides Member
Posts: 14,845
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DIY Turbo conversion?stealthstylz
@stealthstylz
Club Retro Rides Member 174
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Feb 21, 2011 23:05:24 GMT
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I fancy doing a Polo engine with a blow through carb, were Metro turbos a 1 3/4" SU as obviously they're a similar size engine so should work on.
Matt
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spiny
Club Retro Rides Member
Wiki Admin
I am abivalent towards car electrics ...
Posts: 1,330
Club RR Member Number: 167
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DIY Turbo conversion?spiny
@spiny
Club Retro Rides Member 167
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I though that using a pull through carb setup was considered a lot easier ? I haven't done either method yet, though  |
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generally easier - but then you can't fit an intercooler  |
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You're like a crazy backyard genius!
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Ax GTi Turbo
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