carmad
Posted a lot
Posts: 2,000
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just for talk sake whats the cheepest way you can turbo or supercharge an engine
say its a car you don't care about
and you just want to make a quick sleeper for a few runs
i know a few things like 2 head gaskets ect but any one wanna go a bit futher
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Get Paul G on the NSRA forum to laser cut you a thick plate the same shape as a headgasket. Bolt it in. Lash on a larger supercharger than you think you need and go see what you can break
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what car is it? efi or carb?
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I'll prob be doing this to fit a bigger turbo to the rally car ... Fabricate a manifold if you can, or get a local place to do it. Depending on the car/turbo there may be pre-cut flanges available on ebay or from some metal fabricators. You can get thick "T" pieces and bends to weld to the flanges to make the manifold, then sort out a downpipe. When I do mine I'll also be adding bigger injectors, fuel pump and aftermarket management. I know the block and internals will take loads more boost than I'll be using. Good source of info: www.homemadeturbo.com
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Last Edit: Oct 5, 2010 21:29:43 GMT by skattrd
Current cars: 1999 VW Bora SE tdi 1998 Daihatsu Storia X4 (x2) 1995 Volvo 850R 1994 Umm Alter II 1992 Alfa 155 - LPG 1990 VW Scirocco Scala - TSR 1.9 1989 Renault Espace 1988 Mitsubishi Galant Sapporo 1987 Honda Accord Aerodeck Exi auto (x2) 1979 Lancia Beta Spyder
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carmad
Posted a lot
Posts: 2,000
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Ok say you didn't want to use fancy after Market management / boost controllers
how would one go about plumbing up a fifth injector ect on a standard multi point fuel injection engine
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Problem with a boost is that you also need more fuel, not just air if you wan't the car to survive past 0,1 bar and make any extra horsepower at all. This is rather hard to "bodge" The closest would be to use boost sensors (which can be found on for instance old saabs) and wire them to some extra injectors. There are some semi-advanced boost sensors which can be wired to several injectors, and make them open linearly with boost. These can't be found in scrapyard cars though, and probably don't count as "bodge"
Edit - On some engine you can fit stuff from a bigger engine, and bigger injectors, and trick the stock ecu that way. I've for instance heard of m30b35 afm and injectors on a m20b25 works a treat. Not sure on the details though.
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Last Edit: Oct 5, 2010 22:06:32 GMT by dude
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stealthstylz
Club Retro Rides Member
Posts: 14,840
Club RR Member Number: 174
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Run a boost referenced fuel pressure regulator. Feed boost into it. As the boost raises it lets more fuel through.
Easiest way is to bodge a manifold together to bolt a 5 turbo carb on.
Matt
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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run a fifth injecter plumbed up to the fuel rail actuated by a cheep (about a 5er new) washing machine pressure switch its 2 stage and adjustable!! for turbo as a bodge yu can tack weld the dizzy advance weights so its static and run it at a high advance static ie25degs etc.. or fit twin points with one on a switch (again by washing machine switch) to switch the closing points on when on boost effectively retarding the timing.. or turn the advance actuator around the wrong way on dizzy to make a mech advance retarder (a bit fiddly but no biggy) or fit a inline ign retarder (can buy or make) lower compression will alow more boost..
lots of bodge ways..
look at skogen racing for what they can achieve from a pinto and scrap parts!!
go on do it.. si
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Well one extra injector won't get you very far at all, more like 4 would do it.. And obviously one pressure switch per injector, or are we talking very low boost? I've never thought about washing machine switches, have you tried it?
Don't expect any driveability at all except at what however you build it ;D
Obviously a carb'd engine would be easier if turbo carb's for it are readily avalilable, or build a box around the carb. It'd take some knowledge to make the carb work properly though. Rebuilding a carb for blow-through isn't too hard nor expensive, or so i've heard -.-... That was written about holley's though.
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I'm pretty sure from talking to Si (B8D) that he has indeed been there, done that ;D
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I'm in the latter stages of doing this, running 20 percent larger injectors without management and water/meth injection to deal with knock etc and the whole conversion is setting me back about 300 quid including the jaguar supercharger
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carmad
Posted a lot
Posts: 2,000
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the way I did it last time in my manta it didnt last very long due to me not tightning the bolts on the turbo housing and the inside of the turbo hitting the compressor housing
so 2 head gaskets
a polo cold start injector plumbed off the main fuel rain
a pressure switch
an intercooler
and some stainless bends
as for the oil lines ect I used home heating oil buner hoses lol
and a greedy b spec 2 boost controller and a xs power waste gate
thinking off using alot off this stuff again but apart from that would love any tips / advice you guys have to offer
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Last Edit: Oct 6, 2010 18:39:33 GMT by carmad
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I would imagine that running a large carb(s) in a suck though arrangement would be one of the more simple ways of adding forced induction as long as whatever is sucking can deal with the fuel.
Lewis
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would help if we knew what engine it was, as there may have been something done to one in the past
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carmad
Posted a lot
Posts: 2,000
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c20xe
the good old red top
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I put an eaton m45 on a fiat 5pot without too many problems, cept the boost to 6psi and didnt need to do any engine work, the only problem was the stock ecu wouild over fuel it, but better overfuel than running lean.
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I wouldn't use two gaskets.
The drop in compression is not worth it compare what you loose in gasket strength. So better run it with higher cr and high boost than with a lower CR but weak point around the gasket area. . IMHO
If you need a lower CR I would machine the pistons or enlarge the combustion chamber with a dremel.
When you would use an intercooler and keep the psi down to 7psi I see litte point using a lower CR, high CR gives better driveability. Power increase is around 50-70% with such a setup (the latter with a big exhaust).
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Click picture for more
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then use the c20let turbo and manifold if your gonna turbo it. plus any other bits that can be had cheap. if you intercool it well then 7 psi would be fine, or if you add meth injection you could run more, alot more !
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bmw156
Part of things
Posts: 796
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ahhh the redtop, the standard LET KKK turbos are dead cheap now, saw one for 85 the other day.
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Nitrous kit might also be an option. Easier installation/set up and probably more sellable when the motor goes bang.
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