Pro Charger with 11:1 compression?

**Jason Polzer** · 04-02-2008, 03:19 PM

I have an LT1 heads cam, totally forged bottom end splayed mains, making between 350 and 400HP.

I saw an ATI install on T.V. that took an LS1 car from 368HP to over 500HP.

I'd like that.

Since a stock LS1 motor has high compression like my LT1, can I assume I will be OK with my 11:1 LT1?

**Tracker9118** · 04-02-2008, 03:38 PM

[QUOTE=Jason Polzer;1401123]I have an LT1 heads cam, totally forged bottom end splayed mains, making between 350 and 400HP.

I saw an ATI install on T.V. that took an LS1 car from 368HP to over 500HP.

I'd like that.

Since a stock LS1 motor has high compression like my LT1, can I assume I will be OK with my 11:1 LT1?[/QUOTE
With a stock bottom end you will be on borrowed time.
Not saying you can't if your lt1 is like my ls1 you will see bout 497 hp on a stock ls1.
Found out the hard way. I had over 100000 mi on it.

**jimmybling31** · 04-02-2008, 03:41 PM

Originally Posted by Jason Polzer

I have an LT1 heads cam, totally forged bottom end splayed mains, making between 350 and 400HP.

I saw an ATI install on T.V. that took an LS1 car from 368HP to over 500HP.

I'd like that.

Since a stock LS1 motor has high compression like my LT1, can I assume I will be OK with my 11:1 LT1?

with a fully forged bottom end I don't see why not. I'd upgrade to a copper head gasket and make sure you have really good head bolts though.

**N20LT4** · 04-02-2008, 06:28 PM

A Pro Charger on an 11:1 motor is, in short, a No No! If your going to go supercharged, i'd recommend lowering the compression or the motor is NOT going to last long. Nitrous would better suit your current setup.

**440 rwhp trans am** · 04-02-2008, 06:54 PM

lol you would blow your motor up! no question. n2o will be just fine

**ultra_badass** · 04-02-2008, 07:29 PM

+1 on the N2O idea

**Jason Polzer** · 04-02-2008, 07:44 PM

I originally built it for nitrous. It is a really stout 350 no expense spared.
But now I'm thinking bottle fills will be a hassle. I haven't bought a nitrous kit yet. I just got thinking about other power adders after seeing an ATI install on Horsepower TV. It would be nice to have the power there all the time.

<shrug>
I figured if people with stock LT1's and LS1's are bolting these superchargers on I could do it on my built nitrous motor?<shrug>

Maybe not - anyone tried?

**ultra_badass** · 04-02-2008, 07:47 PM

with that high of compression something will give nos is alot better for that high on compression

**N20LT4** · 04-02-2008, 08:31 PM

Originally Posted by Jason Polzer

I originally built it for nitrous. It is a really stout 350 no expense spared.
But now I'm thinking bottle fills will be a hassle. I haven't bought a nitrous kit yet. I just got thinking about other power adders after seeing an ATI install on Horsepower TV. It would be nice to have the power there all the time.

<shrug>
I figured if people with stock LT1's and LS1's are bolting these superchargers on I could do it on my built nitrous motor?<shrug>

Maybe not - anyone tried?

You have to factor the 11:1 compression. You built the motor for: Nitrous! That's your only option right now if you wan't a successful combo. Stock compression for an LS1 is 10.1:1, and many people that go the blower route even with the stock comp don't get away with it for long. Your pushing 11:1. A supercharger is virtually out of the question!

**ultra_badass** · 04-02-2008, 08:50 PM

with that high of compression something will give nos is alot better for that high on compression

**jimmybling31** · 04-02-2008, 09:23 PM

I do agree with the people that have said go n2o. it will be better with high compression. a supercharger would require alot higher octane fuel.

**ultra_badass** · 04-02-2008, 09:34 PM

prem is really ok with a FI setup..the only problem is the comp..if he would lower the comp to 7:1 or 8:1 then going FI would work and you can still put n2o on it

**Tracker9118** · 04-03-2008, 05:01 AM

If you want more power go to www.TPIS.com get a hold of them tell them what you have & they will tell you what you need to get 500++ hp with out nos or a blower.

**Jason Polzer** · 04-03-2008, 06:34 AM

I was hoping to find support for a not-so-good idea but you guys are confirming what I already thought.

Oh well I'll spray it until something breaks and decide what happens then.

Jason

**superchargedblackgto** · 04-05-2008, 12:07 PM

Originally Posted by ultra_badass

prem is really ok with a FI setup..the only problem is the comp..if he would lower the comp to 7:1 or 8:1 then going FI would work and you can still put n2o on it

9:1 is ALL I would go if it is for street, those are really too low 7:1-8:1
Brad

**joejenkinsglass** · 04-06-2008, 07:45 PM

you can use a supercharger with a tune but really probably wouldnt see enough gain without using race gas
sounds like your lt1 should make more than 350-400hp if you went through the trouble of getting splayed main caps

**vaticano** · 04-15-2008, 06:41 PM

Originally Posted by Jason Polzer

I originally built it for nitrous. It is a really stout 350 no expense spared.
But now I'm thinking bottle fills will be a hassle. I haven't bought a nitrous kit yet. I just got thinking about other power adders after seeing an ATI install on Horsepower TV. It would be nice to have the power there all the time.

<shrug>
I figured if people with stock LT1's and LS1's are bolting these superchargers on I could do it on my built nitrous motor?<shrug>

Maybe not - anyone tried?

ok I will. DO IT 11.4:1 procharged at 10#'s