I am just looking for some feedback. I am going to do it regardless but am wondering if anyone has had any success with this combo?

works well. a small N20 shot can give big gains cause it cools the hot turbo intake air.

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'99 T/A
plannin out a 64-66 turbo SL6 barracuda

Have you done this personally, or just stating theory, or what someone else has said? I am going to try it, but it will be quite far in the future at this point. I am still in the process of redoing the car/engine.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

it is proven. say u put only a 50hp shot of nitrous. u might get 75hp additional out of that 50hp shot. nitrous works as an additional intercooler, kinda like meth injection, but more potent. it can also help down low with spooling on a big turbo

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'99 T/A
plannin out a 64-66 turbo SL6 barracuda

I've been 12.90 on a 50 hp shot and a grand national turbo in a "83" d- 150

watch your gas

it likes a lot of octane

93 WILL melt head gaskets

Fred

Don't take my post the wrong way. I know it can work, otherwise I would not be planning on doing it. I am looking for some first hand lnowledge.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Charlie, I have run this setup in a few different engines. Although not a /6. It does work very well, and does aid in cooling which tends to bring out more HP than just the shot itself produces.

Although some care must be taken. If your running a turbo that is to big for a engine & use it to help spool, you can get into trouble real quick with surge. I totally killed a compressor wheel & you would have though it had something run through it like a bolt or something, but it simply was because of too much surge (pumping more air than the engine can take). You can also over spin the RPM speed of the turbo.


The ways I found using it was worth the chances, was to run a bigger A/R exhuast housing to give extra room for the extra exhaust that needed to flow. Plus using a ported compressor housing can help fight against major/over surging the compressor side. Most every time I ran into any problems doing this was with very small engines ( 4cyl mostly) and big turbo's. We where also using big shots of NOS (125/250). If using small shots its not as much of a problem.


As far as engine damage & blown head gaskets, its just like anything else, if the tune up is right it want cause problems. One way we found that was very good HP gain for the amount of NOS used, and was very safe, was on EFI Big Blocks where we used the NOS dry (no gas added through kit) and used the EFI system to add the extra fuel. We didnt need it to help spool or power, we many used it for the cooling affect & at the big end of the 1/4 it made big differnces becuase we where not using a intercooler. We where spraying 100hp worth. On a /6 I think about 35 to 45hp worth would be about the same effect.


One think to consider is the boost is going to jump a few pounds as soon as the NOS is ingauged. This could be anywhere from 3 psi to 10 psi depending on the complete turbo/engine package.


One thing you never want to do is have a NOS backfire with a turbo setup. I left a intercooler setting at the starting line that looked like sheet metal from this. This is one reason we started trying using the NOS dry, there was no where near the problems with a possible backfire with a dry setup, because there was no fuel/gas in the intake track.


IMHO though, if the setup is designed for it, and everything is right, and turbo limits are not over run, there is really no limit to the amount that can be run. But you better know what your are doing. As far as the /6, if one was running something like a T70 turbo, a nice 50 shot should be no problem as long as the incress in boost & the exhaust A/R side is considered, also I would want a ported compressor cover, BOV and maybe even work out some kinda POP of plate like the SuperCharger guys use. But to be honest, using the NOS to help spool is not the way to use it, get the right size turbo & stall convertor for that.



Jess

What kind of boost are you running? Do you use the nitrous, just off the line, just on the top end, or all the way, from start to finish? Are you FI or carb?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Lucky:

My Turbo is a dinosaur and actually a little small, compared to what I see running, today. It is a Modified Rajay that was originally (OEM) used on a 168 CID 65 Corvair Spyder. I have run at about 11-12 lbs of boost and can see 1-2 lbs on the starting line up against the converter at about 2500-3000 rpm. I am a draw thru system, witout a charge cooler.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I have used the NOS shots from end to end. Your setup seems to have enough convertor that using it off the line would not be a big scare from backfiring, your up in the RPM's enough that it "should not" be a problem.

But, that turbo sounds a bit small to be pushing this way. If I did it, A very small shot is what I would use (maybe a 35 shot) . I bet even a 35 shot is going to push you right upto 15psi with the same wastegate settings. Compressor surge should not be a problem, but to much exhaust backpressure could. And thats when head gaskets & tuning problems start happening. If boost can be backed down to around 6psi for testing & then move up slow from there. I have never run NOS on a Draw-thru setup though, I believe I would want it after the turbo. Which may be kinda hard to do. The Pro-Charger guys do spray Meth in ontop of the compressor blade and have no problem with it. I think with a setup like yours, the only way to really know is to start out slow & low to see how it all effects things. If you back boost down, and kinda just replace it with the NOS then it should be a go, and give more power. But back boost down to the piont that when the NOS is hit, it brings boost back upto the same level you was running. That should keep it from making to much backpressure, and make more power from it just simply being cooler.


IMHO, sounds like what you need is a Turbo. Ofcourse it all gets into money I know, and your probably trying to get that little extra without going into the billfold to much. But changing to a T61 BB turbo and doing a blow through would make so much more power & still spool
( maybe even quicker) as good as your small turbo. The truth is it would make more power at the same PSI and be safer because it would be cooler, even though it would be more air from being a bigger turbo. Plus the exhaust side can flow better with less pressure.


I am sure you know most of this about using a bigger turbo, but I thought I would meantion it anyway. If your like most of us, time,work & money hold us back from improving our combo's with big changes.


Jess

Well, a newer style/type turbo is out of the question. The one on the engine now is a "F" flow, I don't remember the turbine A/R size. I do have a NEW Rajay "E" flow on the shelf, for an upgrade, but haven't tried it, yet. Been on the shelf for 25 years. Think anyone else on this site can top me for procrastinating?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I am using the the t-4 70mm with the nitrous express shark nozzle. I would like to use it for cooling purpose mostly. The ar on this turbo is .109 I think. I am using a trans brake and a 3500 stall to help get the boost up. The stall I know stalled around 4500 behind a good v8 I had.

Procrastinating?? You got me beat by 2 years. I bought my Aluminum block ,that was only run in the Chrysler lab, from a Chrysler Engineer 23 years ago and have never built it yet. Hat's off, your the procrastination winner.

What is the most boost anyone has gotton out of a factory slant six?

20.91