: Nos



baus
04-07-05, 02:37 PM
i have an 81 sadan deville and i was planning on spraying a 125 wet shot on it, and i was wondering if anyone has ever done it. i need to know if the fuel pump can handle it or if i need to get an inline pump.
i know its not going to be that fast but with a few more parts it will be pretty damb sleeper

90Brougham350
04-07-05, 03:16 PM
Few questions to begin with, what engine is it, and how many miles does it have on it?

Brian

baus
04-07-05, 03:50 PM
307 120,000

illumina
04-07-05, 06:19 PM
307 120,000

This reminds me of the "two peice" block I pulled out of an '86 Deville of mine...Can't figure out why the engine was in two peices though :hmm:

If memory serves me correct, the Olds 307 used in the early '80's were considered in the same respects as the Cadillac HT4100 engine for weird engine troubles. I would transplant a 350 in her and then do the 125 wet shot.

If you want to be really creative, transplant a big block Cadillac engine in her with a 1:1 ratio for hp to cubic inches. After all, a 500 C.I.D. engine pumping a conservative 1 pony per cube would be pretty nasty. Funny gas need not apply.

90Brougham350
04-07-05, 07:45 PM
Spraying a 5.0 simply isn't worth the effort. True, the engine will most likely be alright, but do you want to take the chance on completely stock 1. bottom end 2. pistons 3. rods? Probably not. Find a 350 and enjoy the torque. Save the spray for the dentists' office.

Brian

baus
04-15-05, 12:33 AM
one of my friends told me that i might have to get a kit that is specific for my catty cause of the type of intake is this true and if so where do i get one if not how do i hook it up with the intake that i have

davesdeville
04-15-05, 02:23 AM
Did you swap a 307 in there? The stock engine is most definately not a 307, it's a 368 the runt of the big block Caddy motors. Since it's an 81 it should be a 8-6-4 car too. I don't think a 125 shot is too bad on a 6.0 liter engine, but I'd swap a 500 in there. Using the accessories from the 368, a 500 will essentially bolt directly in. Then spray a 150-200 shot on top of that and you have an easy 450-500hp and well over 500ft.lbs.

Big_Blue
04-15-05, 04:29 AM
wouldnt it be cost effective then spending all that money on a Nos system to just buildup a motor? I mean with all that work to get the NOS and the refills on the tanks. I would think that the older caddy motors along with the chevy motors are bound true muscle cars in it self and they dont use NOS. I could be wrong but if I have to spend atleast a 1k on a motor I would get the most out of it. I seen tuned motors run for along time but never seen a NOS motor last aslong.

N0DIH
04-15-05, 04:47 AM
NOS adds tons of free O2 to the chamber, making it lean. So you need to ensure you have sufficient fuel to support what it will do. That is why it is considered Supercharger in a bottle. It adds more oxygen to the chamber than the normal flow allows in, and you need corresponding fuel to match that O2 so you don't go LEAN and have these neat little holes in your pistons.

Might look for a set of DX rods from a Turbo 301 Trans AM. They are the richest factory available. I would wholeheartedly recommend a 301 Turbo Carb. But you need to externally plum vacuum the power piston, as it is an external source on that carb. It was normally connected to the PEVR which when boost was present, killed vacuum to the power piston forcing rich mixture from the primaries. It is possible to have boost and not be in the secondaries. GM Engineers needed to ensure there was sufficient fuel for that. So you can connect a vacuum switch that when the NOS is turned on, the carb goes to full rich mode. GM is wonderful eh?

And don't get em going on the EMR Ignition module that is another cool thing for drag racing!!! High Compression guru's need only apply..... This is not for ECM controlled engines, only carb non computer controlled that this "trick" works for. So like a 1970 500 with a 1975-up non computer HEI....

elk9300`
04-15-05, 12:52 PM
Here are a couple of links related to the enrichment valve on the turbo 301s and even the early turbo regals (carbed versions)

http://members.fortunecity.com/petesbuick/ (http://www.members.fortunecity.com/petesbuick/)
www.turbobuick.com/forums/showthread.php?s=&threadid=105525&highlight=pevr (http://www.turbobuick.com/forums/showthread.php?s=&threadid=105525&highlight=pevr)

davesdeville
04-15-05, 02:44 PM
NOS adds tons of free O2 to the chamber, making it lean. So you need to ensure you have sufficient fuel to support what it will do. That is why it is considered Supercharger in a bottle. It adds more oxygen to the chamber than the normal flow allows in, and you need corresponding fuel to match that O2 so you don't go LEAN and have these neat little holes in your pistons.

Ever heard of a wet kit? They spray in a proper amount of fuel with the nitrous. Almost all carb kits are wet kits, if this is a 368 it will be FI and there are wet kits for FI systems too.

FrankieSixxxgun
04-15-05, 03:02 PM
I got a friend who sprays 150 on top of his stock '94 (maybe '95) Roadmaster with 160k miles on it. It'll pull the front wheels off the ground!

D148L0
04-15-05, 05:12 PM
I wonder about the transmission. As far as I know, some of the cadillac ones can't take such increase in power.

davesdeville
04-15-05, 05:44 PM
Since we still don't know if he swapped in a 307... I'll assume it's the stock 368 engine. Behind 368s were TH400 transmissions. I wouldn't hesitate to spray a 200 shot on top of a 500ci backed by a stock TH400, they are SOLID.

Diablo, GM's front wheel drive transmissions are the weak and problematic ones. Like how they had to detune the 3400 to keep the transmissions from eating it. Their RWD turbo hydramatic 350s and 400s were quite strong.

90Brougham350
04-15-05, 05:50 PM
True, a Hydra 400 is about as mean as it gets for trannies, but don't forget, trannies and engines age at roughly the same rate. If you gonna spray the funny juice through any engine which might able to take it, a tranny with 140,000 miles might not like that too much, no matter how strong it is.

Brian

D148L0
04-15-05, 05:57 PM
Since we still don't know if he swapped in a 307... I'll assume it's the stock 368 engine. Behind 368s were TH400 transmissions. I wouldn't hesitate to spray a 200 shot on top of a 500ci backed by a stock TH400, they are SOLID.

Diablo, GM's front wheel drive transmissions are the weak and problematic ones. Like how they had to detune the 3400 to keep the transmissions from eating it. Their RWD turbo hydramatic 350s and 400s were quite strong.
Thanks for the info, man. Now I know a little more... :yup:

D148L0
04-15-05, 06:06 PM
I hate when this happens... double post.

N0DIH
04-15-05, 06:54 PM
Ever heard of a wet kit? They spray in a proper amount of fuel with the nitrous. Almost all carb kits are wet kits, if this is a 368 it will be FI and there are wet kits for FI systems too.

I didn't catch the name, but that is the best to get. "dry" ones are not very safe on proper ratio of N2O to Fuel. But a wet kit would be safest. Ensure that you aren't using stock rod bolts, I wouldn't trust them any farther on N2O than I can throw them....

davesdeville
04-15-05, 07:03 PM
Dry ones use the computer to inject the extra fuel. Some computers are better than others at doing this and I sure as hell wouldn't trust a first generation DFI system to do it. Direct port nitrous is actually the best to get because they spray right at the end of the intake runners but they're technically wet kits too.

Adam
04-16-05, 05:59 PM
I got a friend who sprays 150 on top of his stock '94 (maybe '95) Roadmaster with 160k miles on it. It'll pull the front wheels off the ground!

there are other ways of getting the front wheels off the ground:thumbsup: :D .

N0DIH
04-17-05, 01:30 AM
My floor jack does a good job of it!

baus
04-19-05, 02:43 PM
i put the 307 in but now the tranny is bad so i think that i will go with putting a new one in so i will prolly put a 500ci in

davesdeville
04-19-05, 06:44 PM
500s are the way to go. Then you can safely spray at least 150 on top of the 300hp it should have stock, I think you'll be pretty satisfied with it.