tim99ws6

iTrader: (31)

So, Would it be possible to run 11:1 and stay pump gas as long as i don't spray? Then, if i did decide to spray, switch over to race gas? Is this a reasonable option?

Adrenaline_Z

You can pull timing if you spray. The fuel curve must also be adjusted.

The race gas is not always the best solution. Sometimes it may slow you down.

What you need to try is small shots of nitrous and increase the metering
of fuel and pull a good amount of timing at first. Add timing slightly each
time until the car slows down (or dyno power drops).

Also monitor engine temp, exhaust temp (EGT if you can), and knock counts
as you add timing.

slow trap

iTrader: (22)

i don't know your timing events of your cam but it will probably bleed off more cylinder pressure than a smaller cam.with a tune 11:5 cr shouldn't be a problem,heck i,ve got a carbed 406 with 11.5,it's all in the tune.at the dyno retard 4-6 *and richen it up to 12:0 afr on the n2o.where are you having your car tuned,i'll be needing another one in a few months?

tim99ws6

iTrader: (31)

I will probably be taking the trip to Gomer in Trussvile, Al. He is on the board here, and as far as i know, the closest respecatable Ls1 tuner since TEA packed up and moved away

GMTECH

Hey Tim, sorry to hijack, but you wouldn't happen to know Brady, would you? Cause I think one night me and him and another dude drove to your apartment in the 'Boro.

tim99ws6

iTrader: (31)

Yea, i know Brady. I don't particularly remember that night though.

CamTom12

iTrader: (1)

I don't agree with this... from experience.

Lemme edit it: The strongest engines have MORE compression ratio, less spark advance, and more nitrous

Adrenaline_Z

Read the articles.

Don`t forget, we`re talking about pump gas.


Again, I will quote NOS tech for nitrous applications:

However, when higher compression or higher horsepower levels are used, a racing fuel of 100 octane, or more, must be used.


I`ve listed URL`s of credible source that state that compression MUST be
lowered on pump gas nitrous motors to be effective.

This going in hand with everything I`ve learned about charge filling over the
last 17 years.

For anyone to doubt this, is losing my respect. I have a line in my signature for
people like that.

Prove me wrong with a credible link, or blue prints of your nitrous fed high
compression N20 motor.

Otherwise, it`s all bench racing bro.

CamTom12

iTrader: (1)

Can't feed you blue-prints because its not my motor and the specs don't get leaked. It is on race-gas, however the compression level is WAY high. Something way above the magnitude we're talking with Tim's motor.

I don't have a line in my signature because usually I don't have to argue with people over what I've seen.

Adrenaline_Z

Some of you are totally missing the point.

He wants to use PUMP GAS

Pump gas, not RACING GAS.

Can we put this to rest now?

CamTom12

iTrader: (1)

re-read my post.

Adrenaline_Z

I read it twice now, and I saw that it`s WAY high on compression.

Now you`re throwing in another set of criteria:

- Cam specs (mainly IVC)

- Chamber size

- Quench height (Compression height)

- Fuel octane, and fuel type

Back to the topic:

On a street and strip engine such as Tim`s using pump gas 93 octane,
a fairly aggressive camshaft (let`s say CC306 for a benchmark) and
100 shot of nitrous, are you telling me going over 11:1 compression is
a good thing?

CamTom12

iTrader: (1)

We're talking a street/strip LS1.

A very aggressive cam (can't give the specs publicly. It's big, though.)
tight squish (.030-.035)
93 octane, (knowing Tim I'm sure he'll dump some 103 in for the track, but we're not supposed to figure for that. That's his safety net)
Chamber size is what we're trying to figure for.

Adrenaline_Z

Look, no offense, but if you`re not going to reveal cam specs to debate an issue, then drop it.

Nobody has posted anything worth believing.

As for Tim`s motor, or any street / strip entry using a good shot of nitrous
on 93 octane, raising compressoin is counter productive.

It goes against all technique for high cylinder filling (VE).

ANy engine builder worth his lunch bag will tell you this.

I encourage anyone here to call up an engine tuning shop / pro nitrous engine builder and quote my posts.

Then we can separate the men from the boys.

CamTom12

iTrader: (1)

Actually, we called the cam designer (also an engine builder) and got his input. You'd be surprised.

He said to run it drastically higher than 11.1

EDIT: no offense taken, by the way

Adrenaline_Z

I`m in for a surprise. Post his number, I`ll call him tomorrow and talk.

I`ll post two of my sources:

Bob Schilling

Schilling Performance

519-622-5890

Relation: Ex - Boss

You can see the name of his shop on the side of the car as well.
Car:
Top Sportsman
http://gmthunder.com/tech/bobburnout.jpg
http://gmthunder.com/tech/bobZ28hoist.jpg
http://gmthunder.com/tech/bobchute.jpg
http://gmthunder.com/tech/bob4link.jpg

Jon and Jim Salemi at G-Force Race cars
http://www.gforceracecars.com/home.htm

(716) 693-8533

Build Pro Mod, N/A, blown and nitrous engines

My name is Tino, you can call me as well

519-570-2580

BriancWS6

iTrader: (18)

So I guess you used to have your car tuned at TEA Tim? Me too, and we're in luck. I was VERY impressed with the tuning Brent Lightfoot did for me on my old car. He was the tuner at TEA before they left, and guess what? He and another fella have opened their own shop in BG. PM me for info, he's who I'll be going to for all my tuning and dyno pulls

GrannySShifting

iTrader: (10)

11.5 if your running late IVC and some overlap is doable on pump gas with nitrous too. I wouldnt build a LS1 with less then 11.3-11.5 compression.

PREDATOR-Z

Adrenaline,
Quit acting like you know it all Bro. He said (93 pump gas) and I gave him my answer.
N2O use is very tune dependent, so of course you have to reduce timing and add fuel accordingly while monitoring with data logger.
Do you even have an LS1?
Juicers all know that the higher CR the more power. Of course higher CR demands higher Octane.Quench plays a big role to.
Here I have 98 Octane premium and I can shoot 200 dry on stock motor without even pulling timing. Yes 28.8* with a 12.6 AFR and I could lean it a bit.
CR 10.4x
So please try to relax, trade info, learn a bit but avoid bashing, and acting like you are King of all knowledge.
Some BBC at the track here are running 14:1 and shooting 400 rwhp shot DP.

kumar75150

I've been running 11.5:1 on 93 octane and the Texas heat for a while now but I have a fairly large cam.