Help, how much nitrous can a stock 6 bolt hold?

[casper_talon]

I have a 1991 4G63 N/T 6 bolt motor, and I plan to add nitrous. How much can the stock pistons handle? do I need to change them or the rods for a 75hp shot? Any help would be very appreciated. I plan to use a wet kit plus a Apex SAfcII, 2 1/2" exhaust, headers, ported head, etc. Thanks for any help!

 

[Rob10_99]

a 75shot better be wet for an NT, I would say that should do you for a while, thats a good shot of power for a FWD non-turbonite

can you start with 25/50/75 so you dont blow it the first shot, if your going to use it dry,


I have no idea, but does your afc compensate for NOS?

 

[luvmygst]

You dont need an afc to run a wet kit the afr is controlled by the fuel jet. I would upgrade the fuel system for the added demand, And I would feal safe around 100n2o jet and a 125 fuel jet. I would start at 50 or 75 first and get the hang of it, then work your way up. The main difference in the na motor is the compression. Its still a strong motor.People are making 3-400 hp with turbos this can be accomplished with n2o also. Turbos and n2o basically do the same thing add more air into the combustion chamber. Add the fuel to go with it and you make power. Get a logger and watch timing and knock and work up slowly. Nitrous is very mis-understood by alot of people but used correctly its a great way to make power. People just hear the horror stories and think that it applies to all users. educate yourself on nitrous and you will see it is just as safe as a turbo when done correctly. I have personally sprayed 300hp on a stock mustang with fuel upgrades. When you start spraying alot be sure to pull some base timing it will help with knock. I have had alot of experience with n2o. If you need any thing pm me. I at one time thought about taking the turbo off of a 4g63 and spraying it to get the power I wanted.

 

[casper_talon]

So what type of pistons should I use? are stock turbo ok or forged? will the rods hold? thanks.!

 

[RS-RGS-T]

definately highest possible octane or kapow!

 

[casper_talon]

thanks to everyone who has posted. please keep helping me, will a 7 bolt or a 6 bolt be better,? I have both but don't know which is stronger. would bigger injectors be needed?

 

[luvmygst]

definately highest possible octane or kapow!

I sprayed 300 on a stock mustang with 93 octane. Its all in the timing nad the n2o/fuel mixture. Yes higher octane will let you run more timing and see more power but you dont have to run race gas to spray. Its just that people dont understand how it works.

 

[pooker]

We blew up a n/t on 150 shot, not saying yours can't take it but as old as these cars I would never spray more than a 50 on something I drive everyday.

 

[luvmygst]

We blew up a n/t on 150 shot, not saying yours can't take it but as old as these cars I would never spray more than a 50 on something I drive everyday.

DO you know what jets (n2o and fuel?) you were using? what were the AFR's? what was the base timing, what was the bottle pressure at? What heat range plugs were you using? Thats what I mean by doing the research and not just bolting things on. There is alot that goes into making a n2o system work correctly. A turbo 1g can make 400+ hp on a stock bottom end. Tuned right you can get close to that with n2o. Mabey more with a good tune. How did it blow up? Rod through the block? Or a hole in the piston?

edit:
You are making more than 50hp with the turbo bolted on the front of your car. Just something to think about.

 

[casper_talon]

would this be a good datalogger? http://cgi.ebay.com/ebaymotors/Mits...ryZ43989QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Anyone please let me know, I've never used one or know the average price. Thanks.
Also, do I need to change the pistons from stock to forget or turbo ones to work with the n2o shot?

 

[95GSXCO]

you dont need to change your pistons unless you want to run more N2o. Listen to LUVMYGST It sounds like he knows what he is talking about. I myself have never run n2o but its just common sense read up on it. Upgrade your fuel pump, colder plug and watch for knock. Take it slow and you will be alright make sure you motor is up to par or you will be just like everyone else giving n2o a bad rep. I have always heard a good rule of thumb is no more then 100 shot on stock parts and you will be fine. So no you dont NEED to upgrade your piston but it will help you if you want more juice.

 

[RS-RGS-T]

of course 6 bolt jus for the mear fact of crank walk...

 

[rhamlinii]

Timing is your worse enemy, so as long as you get something to retard timing. i would'nt trust that afc, because your working against yourself. I would say on 9 to 1 compression on a wet kit, a 150 dp short would be relieable. I've spayed a 100 shot on a "stock block" 14b car with much sucess. Although I have a competion fuel system that I'd rather not go into.

 

[boosted95clipse]

It should handle the 75hp shot, but I really wouldn't push it much more that that. It's like boosting a n/t it can only handle an extra 10psi or 100 hp and its gonna blow. So proceed at your own risk man

 

[rhamlinii]

Yeah, but he has a 91 turbo 6bolt, not your average 420a. I have put more then 450 whp on a stock block which had the same rod's and crank he does. He dosent have the oil squirter, and has 9 to 1 pistons in his motor. I would do header, intake, and exhaust, 272/272cams, arp's and a metal headgasket. It should at the point, be atleast a 12 second car. If he controll the timing if should be very relieable and would scare alot of people, when he'd pull beside them.

Or he could sell you car and put find a turbo version. My car went 12.8@104 with me driving it with a 14b and stock sidemount.

I plan to add the nitrous, when I get an auto swap or a better clutch.

My 20g with an hunderd shot was very fun, to drive.

 

[casper_talon]

My cilinder head is shaved( don't know if said correctly) to the point that it's equal to the valves, and don't know the comp. ratio now( 9:1 pistons). Is that much bad for running nitrous? Also the head gasket if a Felpro, will that hold enough? I'm planning on doing multi-angle head job, will that help? I've seen a engine rebuild kit for about $300 that has 7.8 or 9.1 pistons (they say Grant), NPR rings, all rod bearings, timing belt w/ tesioner & idler, gaskets, water & oil pump, etc. Is that worth it? Thanks for all help!!

 

[rhamlinii]

My cilinder head is shaved( don't know if said correctly) to the point that it's equal to the valves, and don't know the comp. ratio now( 9:1 pistons). Is that much bad for running nitrous? Also the head gasket if a Felpro, will that hold enough? I'm planning on doing multi-angle head job, will that help? I've seen a engine rebuild kit for about $300 that has 7.8 or 9.1 pistons (they say Grant), NPR rings, all rod bearings, timing belt w/ tesioner & idler, gaskets, water & oil pump, etc. Is that worth it? Thanks for all help!!

You will be fine with the 9-to-1 rebuild kit. Don't wory about headwork because your going to get some cams, metal heagasket, arps and spary at least an 100 shot if not more. If you can afford the headwork, it would be better to just turbo the damn car instead. As long as you have safe timing and it's jetted properly, you'll be fine.