September 15, 2019, 04:54:33 PM

Author Topic: Turbo or Nitrous for my LT1?  (Read 712 times)

Offline freeskier7791

Turbo or Nitrous for my LT1?
« on: September 05, 2018, 11:55:44 AM »
Hey guys,

I am wanting more power in my LT1.  I already have a cam, and valvetrain mods, and also have ARP rod studs and main bolts.  Engine is a gen II SBC (LT1), 2 bolt main, stock crank.  What would be better for longevity, a 100 shot of nitrous or a turbo at 8 psi?  I have no problem changing pistons but don't want to spend the money on heads yet...

Offline digitalsolo

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Re: Turbo or Nitrous for my LT1?
« Reply #1 on: September 05, 2018, 12:04:47 PM »
I like turbos because you don't have to refill them or remember to open the bottle.  :D
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...  project car
2016 BMW 428i xDrive Gran Coupe - Completely stock...ish

Offline cool

Re: Turbo or Nitrous for my LT1?
« Reply #2 on: September 05, 2018, 12:35:00 PM »
I'm a nitrous guy.  I assume you have a high volume fuel pump and a wideband o2 already in the car.  if not, you need both.  You can do a basic wet kit that pulls fuel from your fuel rail for around $600.  I would add a window switch and a bottle heater at minimum.  A remote timing controller is nice for making quick easy changes.  100hp isn't much for that motor, so I'd run a 1 step colder plug (copper, non projected tip) and start with 4* of timing retard.  This would be a good baseline to work from.  Learn how to read plugs, and if possible datalog o2s and knock activity to make sure you are staying safe.  I usually shoot for 11.8:1 air/fuel on the kit and will adjust timing, fuel or nitrous jets depending on the plugs and how the car responds.  You can add other safeguards like a fuel pressure cutoff switch and/or an A/F lean cutoff switch to shut the kit down if you lose fuel pressure or your A/Fs go beyond your limit.

Nitrous is $7/lb in my area.  On a 100 shot with a 10lb bottle you'll probably get around 10 consistent pulls before you start seeing bottle pressure causing tune up changes.  That's the downside to nitrous - its cheap up front but costs a lot if you use it often.   

Offline freeskier7791

Re: Turbo or Nitrous for my LT1?
« Reply #3 on: September 05, 2018, 01:26:03 PM »
I like turbos because you don't have to refill them or remember to open the bottle.  :D

That is true!

I'm a nitrous guy.  I assume you have a high volume fuel pump and a wideband o2 already in the car.  if not, you need both.  You can do a basic wet kit that pulls fuel from your fuel rail for around $600.  I would add a window switch and a bottle heater at minimum.  A remote timing controller is nice for making quick easy changes.  100hp isn't much for that motor, so I'd run a 1 step colder plug (copper, non projected tip) and start with 4* of timing retard.  This would be a good baseline to work from.  Learn how to read plugs, and if possible datalog o2s and knock activity to make sure you are staying safe.  I usually shoot for 11.8:1 air/fuel on the kit and will adjust timing, fuel or nitrous jets depending on the plugs and how the car responds.  You can add other safeguards like a fuel pressure cutoff switch and/or an A/F lean cutoff switch to shut the kit down if you lose fuel pressure or your A/Fs go beyond your limit.

Nitrous is $7/lb in my area.  On a 100 shot with a 10lb bottle you'll probably get around 10 consistent pulls before you start seeing bottle pressure causing tune up changes.  That's the downside to nitrous - its cheap up front but costs a lot if you use it often.

I already have a Zex wet controller and a bottle, and can tune my ECU easily.  I have a Walbro 255, would I need more pump?  Wideband isn't an issue either.  I wonder how long a bottle would last drifting, my runs are around 30 seconds long.

Offline cool

Re: Turbo or Nitrous for my LT1?
« Reply #4 on: September 05, 2018, 01:39:58 PM »
255 is plenty.  It depends on how you're using it drifting... I would think a turbo is better for that application.

Offline freeskier7791

Re: Turbo or Nitrous for my LT1?
« Reply #5 on: September 05, 2018, 03:09:18 PM »
255 is plenty.  It depends on how you're using it drifting... I would think a turbo is better for that application.

Cool, I'll see what I end up doing. Turbo system takes up a lot of space but would be fun fabricating

Offline Cobranut

Re: Turbo or Nitrous for my LT1?
« Reply #6 on: September 05, 2018, 04:08:11 PM »
I'd think that nitrous would be tough to control in a drifting application. 
It's basically a step in power level, and you can't really run it at less than WOT.

I'd recommend the turbo.
1995 FD, 7.0 Liter stroked LS3, T56, 8.8, Samberg kit.

Offline scuter83

Re: Turbo or Nitrous for my LT1?
« Reply #7 on: September 06, 2018, 01:46:31 AM »
I have never tried drifting, but I would think a supercharger would be better due to instant response.  I imagine if you get a turbo small enough to spool well at high rpm you would get good response as well, but supercharger would guarantee that.

Offline freeskier7791

Re: Turbo or Nitrous for my LT1?
« Reply #8 on: September 06, 2018, 07:18:05 AM »
I have never tried drifting, but I would think a supercharger would be better due to instant response.  I imagine if you get a turbo small enough to spool well at high rpm you would get good response as well, but supercharger would guarantee that.

I have thought about a supercharger as well, but they are definitely more expensive.  I would rather run a small turbo, like a T3 or something

Offline freeskier7791

Re: Turbo or Nitrous for my LT1?
« Reply #9 on: September 09, 2018, 05:43:19 PM »
I am going to do nitrous first, and then eventually pull the motor and do a full turbo build

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