GolfGTIforum.co.uk
General => The garage => Topic started by: danny_p on 15 January 2011, 16:31
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never thought i would be considering tuneing a boat anchor but may just be that in this occasion a boat anchor is what is needed.
this is a relativly lowbudget excersis so it'll be running on stock internals and we'll ether use multi headgaskets or a lazercut plate with a gasket ether side to correct compression ratio issues.
so anyone what sort of power / torque will stock internals take ? or boost have people manged to run. it's only going to be running in short bursts and not worried about melting pisons as that looks like a dager we'll just drown it out by throwing more toxic vodka down it throat.
the turbo we have and are planning on useing should be good for around 40-45 psi ( if we ask for it ) and will be attached to a boost engine not the vr itself
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so no one knows what a VR6 will actualy take :shocked:
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My mates running '419bhp' on full boost, 18psi I think. There's a thread on vr6oc about it somewhere, I'll dig it out when I'm not on my phone.
Stock internals, obviously a home made jobbie, huge turbo, f@@k a duck does it shift!
EDIR: more about 38psi
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Also it's the 2.8 golf engine
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You could go 2.9-3.00 litre on that block if its bored out right might be wrong, but I would expect the person who is doing the porting and mods would have a table value for the amount of pressure it could handle?
But over 400BHP would be hard and to the limit! so 2.5 bar or just over would be used my guesstimate as you're fuel pressure would be insane just to match the flow of air being used up?
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1.7bar of boost my mate runs to pass 400brake... granted i agree that the dyno it was on probable over read but its definatly near the limit. Its still an animal on low boost :laugh:
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I'm not planning on doing any serious headwork to it at all. i'll probs just strip and inspect the head possobly tricut the seats and port match.
don't plan on doing any boreing or new pistons this is going a to a pikey cheep built all it got to do is rip down the odd 1/4 mile and try make reasonable times up the odd hill.
looks like i'm going to go with the 2.8 as found a cheep mk3 donor with a duff HG so i'll rip the motor out of that tomorrow and give it a quick once over, have come up with a really realy nasty plan for lowering the cr.
i'm thinking i may have a go at welding some ali rings round the outside of the std pistons so i can keep the piston squish when i add the horrendously thick spacer plate :evil: if welding the rings on dosent work it don't matter as i have a spare set of used 2.8 pistons in the shed.
i'm thinking of a target cr of 8.0 : 1 thats a lot lower than needed but it'll help it out a bit. and running it with a heavy mix of meth should keep it cool
as for getting the fuel in i'll just buzzup a log manifold and stack injectors in each runner so i can have massive cc/min fuel deliver possible and decent spray at low throttel and flat out.
we want a pikey cheep 500 ponies :evil:
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You can get issues with running a spacer plate with the timing chain being too short, all subject to how thick your going to make it. :smiley:
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if i have to i'll find a way of adding a link or two :wink:
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a fair bit of info here, but its hard to find specific stuff as its had so many engine changes and blowouts!
http://www.clubgti.co.uk/forum/showthread.php?t=175625
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a small development has happend today, Had to go down J's workshop to use the tig to stick some of the titanium bits together for the flame chamber of the boost engine. has now presented with some funds for development and pointed at the datsun powerd e46 bimmer with instructions to crack on make it work and then build one for that. :evil:
if work stays quite should have the prtotyped boost enigne finished by friday but were really hunting for an APU to build the one for the bimmer with
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it made made some boost today, has problems tho it's not isn't happy above 40 PSI :sad: defantly needs some inpvements made to controlling it probaly of the elecronic variety to control the fuel into the flame chamber and the bleeding off of air from the compressor into the flame chamber ned to be refined as when it not supplying air it's suffering compressor suge and pressure spikes, but that can be fixed.
flame chamber also needs a minor possobly magor redesing as just before its soposed to be flat out it's ouput drops dramaticly then flames out and stalls , air speed exceeding flame speed me thinks ....... bollox :angry: