Ok I'm considering using a Nitrous Oxide system on my 68. I'm planning on running all forged internals(the crank and rods are already forged from the factory) with Venolia(sp?) forged pistons.

Comp cams int./exh. .440" lift 264 duration. complete kit with dual rollar chain, springs, locks, etc.
Stock oil pump standard pressure
ARP fastners
Clifford oversized valves 1.7" intake 1.44" exhaust
Offenhauser intake manifold 4bbl

Does that sound like a good combo for putting maybe an extra 150 shot into?

It's also going to run a Megasquirt V3.0 fuel injection kit with a T61 Garrett turbo running at hopefully in race trim around 20 psi.

Just wanting to know if I can make it work with what I'm already planning on doing.

I would run either the hose or the turbo. Run both and you are flirting with disaster.

That should be a decent combo for the hose and very safe at a 150 shot. Take out some timing, 2 steps colder plugs, and the best gas you can get and you will be amazed at how much it will pick up.

Just so you know, if your tune-up is off, it won't matter what kind of pistons are in it. Nitrous or turbo either one will kill forged pistons just as well as cast or hyper if you're off. Too much timing will kill a head gasket, too much fuel will eat ring lands, and too lean will hole the top of the piston. Detonation will also beat the rod bearings out of it.

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I've heard of using nitrous to help a turbo spool-up faster and cool the fuel mixture. Check www.theturboforums.com and see what others are doing.

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I really would not see a need to run the NOS with that turbo, a T61 is going to spool quit well on that setup. Not that you cant, but if you do, either just use it for the first part of first gear ( launch out of the hole) or use a big exhaust A/R ( biggest you can get ) and use it all the way through. You will have to set the boost back some if used all the way through so it does not over spin the turbo wheels.



Jess

what type head gasket are you going to use

I'm not sure on a head gasket, I really would rather run a turbo if I shouldn't run both seeing as I can get like 400-450 hp out of it. I was just thinking for te fun of it, but I'd rather not blow the pistons out of it and from the sounds of it I'll be running enough of a risk of that already. Thanks guys

Boost is boost whether it comes from a turbo, blower, or a bottle. When it's good it's great, when it's bad, it's real bad.

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Official Cookie and Mater Tormentor.

Yea a T61 could be good for atleast 600hp at full boost, a very effeicant engine could pull even close to 680hp out of a T61. You should be able to reach 400hp on low to mid boost (14 to 18psi) and maybe even on pump gas if the turbo system is built correct and all is tuned right.



As far as Boost being Boost, I will have to dissagree with that. But what he is saying is it dont matter what you run, if you have it tuned right it will be fine. But even if you only run a turbo, or NOS by itself at low amount you can still burn things up if not tuned right. In other words even 10psi of boost or just a 50 shot could melt things if not done right.


But all in all if aproached right and creep up on the high limits you can get away with a lot. The main thing is to start low, and take very small steps when incressing the boost or NOS. Dont take nothing for granite, check after every ajustment and make sure fuel is right, and that you dont have detination. If you can keep the fuel mix right, and never let it detinate you can push things to very high levels.


A turbo is easier on the engine than any other power adder there is ( if things are tuned right). It can even be better on the bottom end of the engine than N/A because of they way it keeps a constant load on the pistons.


Keeping the air cool on a turbo system has more to do with choising the right size turbo. With the T61 you will be fine as long as you dont start pushing for high boost, then a Meth kit or a intercooler will be your best bet and will be safer than running a NOS kit if you do wish to push for high boost.

With the power limits you are wishing to reach I would try running with no cooler systems at all. You may just reach them without anything. Then if you did need something addign a intercooler after the fact would not be a big thing anywhy. If you can afford it, get a Ball Bearing turbo and in the T61 size you will be able to get by with out a big stall, and the turbo response will be great. Also I think they make the T61 in a T3 & a T4 frame, get the T4 frame and give it a good size exhaust/downpipe and you will love it.


Jess

I'm looking at this turbo it's a T4 flange T61 garrett turbo.

http://www.turboelements.com/index.php? ... oductId=42
I'm not sure if it has ball bearings or not tho.

That will be a good turbo, although it is not a BB turbo. If you look in the listing it quotes having a "360 degree thrust bearing standard". This a heavy duty journal bearing setup ( the best journal bearing they make). So it is a good strong turbo of the right size ( get the P trim on the exhaust). A ball bearing turbo like this would cost around $1200.00, and would spool a little quicker, but it is not really needed. This will spool pretty good, but about 400 rpm slower than the BB unit just like it. I am going to guess and say a 2800 rpm stall torque convertor would work about right with that turbo for 1/4 racing & street driving.


Jess

Where would I find the ball bearing T61? I can't find one through my google searches.

Turbonetics.com should have them.

Lou

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lol yeah I've seen theirs it's like 2800. don't have pockets that deep.

T61 Ceramic Ball Bearing $1784
http://www.racetep.com/tnetic.html

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Joshua

hmm not to bad. I'll have to consider it.