Jamie F

iTrader: (2)

hey guys, im getting my s10 ready for next year and i have a spare stock 2003 5.3 that i want to install into my truck (actually just got it seated in it yesterday) and i have a nitrous system that i used to run on my carbed sbc.

i want to change from the carbed plate to a plate on the stock 5.3 intake and see how much nitrous i can get away with just for fun lol

i have a fuel cell with a1000 pump and filters and will be running and tuning the stock 5.3 on motor with race gas ( unsure what i will run as of now) and i will be using hp tuners and a wide band to tune the engine out and then tune for the nitrous after, (pull timing, etc.) and running it on straight race gas should give the engine a good shot and should not knock itself to death on me.

question is.. with out swapping cams out to get more into the cylinders,
how much do you all think it can handle before the nitrous will build up in the intake on me going down the track?

MaroonMonsterLS1

190/191 .466/.457 114+2 should be factory lm7 cam specs

This is a loaded question that will involve alot of things. A question you may be asked is how big are your *****?

My quick answer? 150 should be very safe 200 could be done...much more than that and you might be pushing it.

The truck intake generally runs #7 the most lean so keep a close eye on it and CHECK PLUGS!!!

There are guys that have sprayed 250 or 300 on stock 5.3's but most of them were ether carb intake, cam, or both.

Best of luck, let us know how you end up doing!

Jamie F

iTrader: (2)

tug686spd

iTrader: (11)

200 shot looked good in this dyno graph. https://ls1tech.com/forums/dynamomet...ressive-s.html

MaroonMonsterLS1

No disrespect was intended if that's how it was taken.

I think that at 300 on stock cam and intake you're asking for trouble. I doubt you'll find many people that have actually done it.

200 would not worry me, but 300 is a whole new level

Jamie F

iTrader: (2)

no problem man, thanks for all your in put.

if it comes down to it and i do attempt more then 200 ill let you all know if it lives or not, ive got spare 5.3s in the garage so if it doesnt like it ill swap it out haha

Jamie F

iTrader: (2)

those are some impressive numbers!!

Bowtiedford

iTrader: (9)

I would also think the Gains become minimal on the higher hp level (300) just hard to get it in and out, out of the heads due to valve timing. I've had 2 friends run 300 and more and the gains where very small. Hardly picked up any, now on the 150 to 200 shots these cars picked up over a sec. I'm talking about stock cam cars.

I run a Fast 102 and after 250 I really have to watch my plugs as the distribution becomes an issue due to the intake and the plate system atomization of the nitrous. Direct port, now that's a different story

Jamie F

iTrader: (2)

that makes perfect sense to me, ill most likely stop at 200 for most of the season but i might try 250 for fun.


do you know if i can run leaded race gas thru the stock 5.3 injectors with out issue?
or will it have to be unleaded race gas?

Jamie F

iTrader: (2)

Hey guys just want to give you an update,
had the truck out last weekend and it was awesome!


this is a bone stock 5.3 with a tune and headers flowing thru mufflers.
my truck went 8.5 in the 1/8 mile on motor


it went 7.160 and 91.x mph on a 150ish shot (64 jet) thru a nx shark nozzle in the intake pipe.


and yesterday my best et was 6.75 and best mph was 98.3 and my best 60 ft was 1.43 all on a 250ish shot! (85 nitrous jet) thru the same nx shark nozzle.
I pulled 12 degrees off of my 26 NA timing with my lnc 2000 box and pulled an additional 4 degrees from 2800-3200 rpm in the computer with hp tuners to soften the hit a bit and was running vp110 for motor and nitrous with a b8efs spark plugs.
I had my window switch set to turn the nitrous on at 2800 and left the line around 2500 rpm with the trans brake and against the converter.

Jamie F

iTrader: (2)

forgot to mention, its an 85 s10, 90/10 up front, 50/50s in the rear, caltrack bars,
28x11.5 slicks, 4:10 gears, Ford 8.8 diff out of an explorer cut down on one side, a th350 with trans brake, a 2800-3200 stall converter with anti ballooning plates and it weighs roughly 3150 with me in it.

Jamie F

iTrader: (2)

Bowtiedford

iTrader: (9)

Wow that's awesome

Jamie F

iTrader: (2)

thanks, im very happy with the results!

Bowtiedford

iTrader: (9)

hey didn't see the ? on leaded gas. I ran X16 in my stand alone and then some race gas in my tank sometimes on the 250 to 300 shot. It did kill my O2 sensor on my wideband after about 6 months and I didn't use that much leaded fuel or so I thought. I switched to carb so not sure what it would have done to my O2 sensors for my FI. They do make unleaded race fuel too. In VP I used MS103. Now I switched to E85 for a safer tune and no more standalone.

Jamie F

iTrader: (2)

all good thanks, Im running mine in open loop so not using the stock o2s but I do have a wide band in it I should pull out of there then to keep it alive

MaroonMonsterLS1

Hot damn that's movin! What did you end up going with for fuel and how does it 60'

Also, that's pretty light for a truck! Fox I helped build weights about 3380 with a full to the brim tank of fuel and nothing removed but the back seats (driver in it)

We are going to shoot for the exact same thing this upcoming race season. stock lm7 with 8.8, 4.10's, and a 60e on a radial

Jamie F

iTrader: (2)

haha thanks, my best 60' on that tune up was 1.43 and I ran motor and nitrous together on vp110.


ya my truck is fairly gutted, no inside carpet, no front wheel wells, just a plastic fuel cell no stock tank anymore, etc.


that sounds great you guys are gonna have a ton a fun playing with it, at least I know I did lol

MaroonMonsterLS1

It should be a blast!! I have an older nozzle and have been recommended by nx not to spray more than a 200 but it might be the end of the season before we get the cahones to put the 78 jet in it.

Did you ever log AFR and see what the true stock motor liked? Or were you hardcore to reading the plugs? I prefer to read plugs but it's nice to start with afr to just get close before I go through a bunch of plugs.

Also, how high did you rev her and where did you shift? Stock cam usually falls off pretty early but I'm curious how you felt it behave on the bottle.

Jamie F

iTrader: (2)

lol o ya stepped up from the 64 jet to a 85 jet to make it happen lol


I logged afr on motor and got it set at 12.2 and just left it there, I only logged on I think one nitrous pass and it was mid 11s I believe, I then just pulled the sensor out and read the plugs.


I shifted her at 5500 on the spray and about 5800 on motor, the torque on that shot shifting at 5500 was incredible for me lol


on that 85 jet I was only running 14 degrees timing going down the track but the plugs were getting closer to the bend, I think if I used a 9 ngk plug instead of the 8 it wouldn't have read like that and I probably could have a added a couple degrees but for me at the time I was content.