Hi,
I'm not sure if this has been answered before, if it has, could some one please point me in the right direction... I was looking at turbo charging my
1200, and was wondering what experiences anyone has had with it? I'll do all my own fabrication, etc, just need to know what's involved. Looking at
the engine, I don't think it should be too hard. Is there anything I need to keep an eye out for?
Cheers,
Raj
How much power do you want? its not the most sensible way to get a bit more power, Build a bigger stronger motor like a 1776, have fun with that
(youll probably have as much or more power than a 1200 turbo) and then turbo that!
How much power does a stock 1200 have? I dont think you would reliably double it with a standard engine.
just my 2c!
If you've ever seen an engine blow contest at a show? Strapping a turbo on your 1200 would give you a similar effect if it ever pushed enough gas to
get the turbo going. Get Bob Tomlinsons Turbomania book and it will give you some good theory before you decide what to do.
Saying that I would be curious to hear a 1200 spooling up
Cheers
Steve
I say go right ahead with your project.
With a mild boost job, there is no reason you cannot at least double your current stock 40 horses and do it perfectly reliably.
I would consider freshening your engine while you have it out. The stock CR is quite low and need not be altered.
Consider using a To2 (non watercooled) off a Nissan Pulsay ET turbo (usually about 120 bucks)
I would pull thru a 45mm HIF SU (centerfloat) and use an agressive needle, probably start with a BAC.
If you spend more than 4 to 500 bucks doing the job then suck eggs.
Thats quite a bit cheaper than a 1776.
Go for it dude and have some cheap fun, you will never regret it.
L8tr
E
Yeah go over to the shoptalkforums.com Forced Induction forum. There are a few people who have asked the same question on there too.
At one of the dyno days there were 2x 1200,one got 19.9hp and the other got 20hp,the next up was mine a 1300sp which was wayyyy past its used by date and it got 37hp.:o
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hi there are you still going ahead with the turbo?
im looking to try the same. except for the worry of crank/flywheel breaking it should work as long as you go easy on the psi.
im looking at the low bugget.com website and his setup seems basic and has been a success.
only problem is i have 2 1200 motors and no twinport 1600,so im tempted just to see how strong they are first till i find a 1600tp
i usually like to blow through standard carb,wonder if the vw carb would handle it?
anyway good luck and go for it!
Break a crank/fly?? nah, not unless you are planning on really revving its tits off in which case you are approaching the whole job in the wrong
manner.
I would just use a stock 1200 cam and use some stock 1600 rockers for a bit of extra lift. This arrangement will not promote revving it and a To2
sized turbo will be spooling and running well by about 2500 rpm even on a 1200.
So long as the valve springs are shimmed to about 70-75 Lb seat pressure or so, the engine will happily rev up to 5000 rpm. This is more than adequate
rev range to use with a stock gearset.
The only changes i would make to the entire setup is to use a higher volume oil pump and an external full flow filter and cooler and do away with the
stock bypass cooler in the fan housing altogether. This promotes better airflow to # 3 cylinder.
A decent sized cooler and filter setup will add a good amount of extra oil to the stock setup which is a further good thing.
Blowing thru a standard (1600) carb would be a good strategy except for the lack of any boost enrichment. You can overcome this via frigging with the
combinations of main/air corrector jets but a compromise is pretty much the best you will end up with at the end of the day.
I would also look at relieving the combustion chambers as much as possible and blend out any edges and corners as well to help offset any heat buildup
and associated pre-ignition and/or detonation.
Another final thing would be to use a 12V flywheel/starter with its bigger clutch and have a clutch cover with a bit more clamping force using a stock
organic plate.
YeeHar! Have fun men.
L8tr
E
I think the t02 turbo from an exa/pulsar et is too big for the project, not to mention they are all flogged out with an average of 150,000k's on
them. I'd go with a single turbo from the EJ20TT liberty twin turbo 2lt engine.
It will make boost just above 1200 rpm making a dramatic improvement to drivability and low end torque. It will easily hold boost to 5000 too as the
ej20tt's rev to 7000.
I'd suggest keeping the induction side of things simple for starters and use a webber 40idf side draft as a pull thru turbo system. This keeps the
fuel system simple (no need for efi pumps, rising rate regs, return lines etc), unlike a blow thru that needs a lot of additional gear. So long as
you've got a 3.5lb regulated pump it will do. You could probably just use a mechanical pump from a 1600.
As for jetting. 55 idle jets, 130 mains and 170-180 air correction jets. Email me if you've got any questions.
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Thats kind of a funny post? I'm not sure if you are recommending them or not? Running more boost is great but whats the use of its only there from
3000-5000 RPM? To me it makes more sense to use a smaller turbo to spool at low as possible RPM and have it boost torque thru the entire rpm range
from idle.
I wouldn't consider running a t25's off a CA18det's or sr20 as they are way too large for a 1200. Sorry to disagree tassupervee, but it would be
spooling to full boost at about 3700 RPM which is way too late for a 1200cc engine. Plus their ceramic turbine wheels are crap and tend to fly to
pieces if you boost spike above 14lb. I broke 3 nissan turbo's running 12lb (occasionally boost spiking to 16lb because of the gated boost
controller) before I upgraded to a GT28-320 on my 1641. Only the t25's of the S15's had the steel wheel, but they also were rated to above 200kw I
think?
Here's some info on nissan turbo's...
http://64.233.167.104/search?q=cache:yOx3hDjJs9MJ:www.wardriving.com.au/vl/turbos.htm+dave+nissan+turbo+magazine+vg30+rb20&hl=en
Considering the 15 years of advancements in aerodynamics and ball bearing turbo techonology since the EXA's were new, it would be hard to not run an
IHI vf ball bearing turbo from the liberty gt's. Tho if you were looking at a new turbo the GT12 or GT15 would be a really nice match for producing
great low end response, plus potential for 120-130hp at max boost(flywheel hp). They are cheap too at about $1100.
[ Edited on 19-12-2005 by iswinkels ]
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