B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Sept 27, 2006 21:42:14 GMT
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any ideas on turbo ing an imp engine??
got a new project and I'm considering fitting a turbo..
what turbo to use??
what carb?? metro or 5gtt?
what sort of compression are they (sport 875cc)?? and what boost std?? van pistons etc.. what kinda power am i looking at the std bottem end handling??
c'mon i know there are a few impers on here...
many thanks in advance.
si
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slammed 66
Posted a lot
www.gtturbo.org
Posts: 1,675
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Sept 27, 2006 21:53:10 GMT
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Id personally use a metro turbo su on either blow through or draw through, but you wont be able to use an intercooler with a draw through set up, Again personally i'd use a turbo from a modern tdi engine as youll have faster spool up and there not as bulky. Your going to need a boost sensitive fuel pressure regulator (again a metro turbo will come in usefull for robbing) an electric fuel pump (guess what car can donate this?  ) a return line for the fuel tank, an oil cooler will help along with front mounting the rad. Then put it all toghether, sit back, admire and have some fun  |
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86 Renault 5 GT Turbo 89 Renault extra 91 Skyline GTR 98 Mini 1275 mpi 99 Autech Rider www.gtturbo.org |
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pointers on turbo imp??BenzBoy
@benzboy
Club Retro Rides Member 7
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Sept 27, 2006 22:19:20 GMT
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You need blownimp. I'm sure he'll give you a few pointers!  Sounds like a cool project! |
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Sept 27, 2006 22:46:16 GMT
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Right well the rods and crank are EN8 on the imp as far as i know and forged, they will take 8krpm stock (might be and idea to get ARP or cosworth rod bolts though) Get a talbot 920 head and use it with the imp bottom end, this will give you 9:1 or mabe a little lower with the stock pistons. don't use the van pistons as they have a split skirt, this usually leads to a bang if used in and degree of anger! As for the turbocharger, i would use a T2, T25, GT12 or 15, IHI RHB3 cgi.ebay.co.uk/renault-5-GT-T2-TURBO-UNIT-MANIFOLD-ETC-MORE-AVAIL-COMP_W0QQitemZ200031225386QQihZ010QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItemcgi.ebay.co.uk/Garrett-T25-Turbo-200SX-200-SX-S13-No-Play_W0QQitemZ280032813011QQihZ018QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItemI would use the metro carb, as it is much more capable of comping with different engines, as it is a constant velocity type of carb. Also the fact i have one rebuilt on a converted 930cc manifold with the intercooler type of plenum, and the fuel pressure regulator for sale  You will need an injection fuel pump and two fuel lines to the tank, one to and one from the regulator. J |
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Sept 27, 2006 23:38:04 GMT
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thanks people...
ive always thought that diesel turbo would be the way to go size wise but i have also heard that they have different metel used in the turbine and wont handle the heat that a petrol will put it through.... but then i have seen a few convertions on petrol with them... any one had a diesel turbo on a petrol for any significant amount of time that cound confirm this??
blownimp. ive seen your car on the imp club and your threads here and it look very good!!
what compression are they std (mine is a std sport motor at the moment) and what boost could be used "as is"??
no go on the plit skirt van pistons then.... i didnt realise that...!
what about milling the std pistons down?? is there much piston CROWN to play with??
maybe milling the cc's in the head??
how about 930 conrods?? any shorter to alow for stroke giving a low comp in the std 875??
all thoughts really just want to see as many routes as poss......
oh and blownimp what turbo did u have on yours and what sort of lag did u get? was it all top end with nothing till 5000 rpm or not too bad?? only i am planning this for the road..
i was thinking maybe a charade turbo or a gtt. i know that the metro (t3 or something??) was very laggy on the a-series but than that did not loke to rev much and siamese ports etc. altough it was 1275cc as apposed to 875!!
many thanks to all your contrabutions people..
si
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Sept 27, 2006 23:50:01 GMT
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blownimp
good plug and perfect timing!!
how much are you talking for the su and manifold etc?? would save me a few i reckon!!
si
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Sept 28, 2006 11:05:46 GMT
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Yeah a diesel oine would be fine i think, i was running a VNT15 turbo which is for a 1.9 golf diesel. It didnt have an internal wastegate, just variable vanes that are controlled by the golf's ECU, so on my car i used te vanes to change the boost threshold, and had an external wastegate to control the boost. With this set up i had it coming on boost at about 3000rpm, not bad for a turbo fitted to a 1.9! A Gtti turbo would be very well suited to the imp, perfectly sized and ready to boost at about 2500rpm, and a petrol type too. Only problem is availability really, they go for quite a lot of money, AFAIK the turbo in an isuzu trooper diesel is very similar but with a bigger compressor wheel, might be worth a look? As its not going to be a mega lean burn engine like the modern turbo engines, the exhaust temps don't go that high, and so a diesel turbo should be fine. You can go upto around double the capacidt for a diesel turbo, so one thats for a1.7 would be ok for your engine, this one is for a 1.5 clio and should be cracking - cgi.ebay.co.uk/renault-clio-1-5dci-turbocharger_W0QQitemZ170033165284QQihZ007QQcategoryZ10410QQrdZ1QQcmdZViewItemThe stock engine is 10:1 compression if the head hasnt been skimmed in its life, as is i would go for up to 6psi of intercooled boost. Here is a 930 head for sale, new! - www.theimpclub.co.uk/spares/node4.htmlThats not that bad really, and you would be able to sell your sport head for mucho dollar too. You could gind out the combustion chambers a bit and this will help, as would turning a dish in the tops of the pistons (1 - 1.5mm deep and leave a 3mm ring round the edge for squish). I personally wouldent touch the CROWNs a they are first in the line of fire, and so need to be at full capacity for boost duties! With the 930 head and 875 bottom end i would go for about 12psi of intercooled boost, and this will be VERY entertaining i promice, make user you have comp doughnuts, and mabe a disk setup too! intercoolers - cgi.ebay.co.uk/top-mount-intercooler-nissan-gtir-gti-r-pulsar_W0QQitemZ190034509487QQihZ009QQcategoryZ10402QQrdZ1QQcmdZViewItemcgi.ebay.co.uk/lancia-dela-intergrale-16v-intercooler_W0QQitemZ150036861730QQihZ005QQcategoryZ100914QQrdZ1QQcmdZViewItemcgi.ebay.co.uk/cosworth-2wd-intercooler_W0QQitemZ320031701267QQihZ011QQcategoryZ21654QQrdZ1QQcmdZViewItemFuel pump - cgi.ebay.co.uk/AUDI-80-90-QUATTRO-FUEL-PUMP_W0QQitemZ120030385916QQihZ002QQcategoryZ10372QQrdZ1QQcmdZViewItemCheers J p.s. I'm going to use a T3 on my twin charged imp, but only because the blower makes the engine act like a larger one spooling the bigger turbo earlier, T3 all the way |
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Sept 28, 2006 11:38:42 GMT
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excellent stuff!!
so u had no probs with a diesel turbo?! many miles done? any visable melting etc??
thing is that there are some many stories about some say diesel turbo will only last 1000 miles or so and others say they are fine!!
typical "internet experts"lol
this is why i loke to ask people who have acctually done it.
so i will get on the lookout for a later head..
ps did u ever work out what power your previous set up had?? or any "ballpark" figures??
si
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Sept 28, 2006 11:46:23 GMT
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I only ever got up to around 5psi, and my ass said it was about 75bhp. I'm looking for about 90bhp on 9psi with the blower, this will be dyno'ed to see exactly what its doing!
The turbo wont melt, it will crack the exhaust housing, usually between the wastegate hole and the turbine hole, its jolly common really. I had my turbo on the car for about 1000miles and there were no detrimental effects visually.
J
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) a return line for the fuel tank, an oil cooler will help along with front mounting the rad.
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