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PSJ- The car is still very quiet with the 4in exhaust. The turbo is still louder than the exhaust actually.

I dynoed it on a mix of 110 and 93. Probably 70% 110.

Mightymouse- I ran 11lbs of boost on 93 octane many times over the summer with the same tune. So, I would say over 600rwhp on 93 is definitely possible.

I'm sure the turbo is capable of more airflow, I just don't feel comfortable running 25+ psi boost. I'm not really sure of the hp limit of the turbo itself.

Got Me SOM

iTrader: (2)

That is crazy horsepower! Have you beaten a Hayabusa lately?

SS00Blue

Excellent results on an LT1/4. Too bad your shop doesn't have the experience, or knowledge, to make an LS1/6 make the same bones. Maybe some other shop can do that....

I guess I wish I had an LT1-style engine again...

SC-

maddboost

iTrader: (11)

Hope you were really joking. No need to be a jerk to one of the best shops in the Midwest.

Got Me SOM

iTrader: (2)

Before you make a total *** out of yourself you better edit your statement. Speed Inc is one of the best shops in the country.

For your information LS1's are limited by the head bolt design to make big power.

Get a clue before you post.

Speed Inc has great customer service too.

Earl H

iTrader: (1)

Intimid8

I too am running a single turbo kit, however it is on an '03 Z06. At 12 psi, I make 580/580 on 93 octane...what octane are you running/compression at 11 psi and 19 psi? Very impressive results btw.

Excal

what exactly in the "head bolt" design limits the? is this the same with the LS6?

maddboost

iTrader: (11)

Guys running alot of boost seem to "Lift" the heads. Not sure how thats attributed to the bolt design but its what ive heard.

SPANKY LS1

iTrader: (24)

Not the bolt design, actually the head/block configuration. If I am not mistaken, an LT1 has 5 head bolts per cylinder, where the LS1 has 4 bolts per cylinder.

SScam68

iTrader: (20)

madboost and Got me SOM

He is being scarcastic and he is quoting R. Raymers post. His comments aren't directed towards INTMD8.

Excal

well i guess, but supras and rx-7s lift heads too so unless it's a constant problem...

Then again there should be a 1000fwhp ls1 out there by now.

Kinda disheartening to hear the lt-1 has an advantage on the ls1 like that..maybe the ls1 is just a N20 motor and BIG power with FI is just an uphill battle..we already get screwed with prices and kits compared to stangs.

maddboost

iTrader: (11)

I probably jumped the gun on him but Im sick of all this shop bashing by people who dont even buy stuff from the shops they rip on.

MIGHTYMOUSE

iTrader: (59)

oh please.. he meant what he said.

c5r heads use the same bolt pattern and are 'holding down' 8.5 ET's.... easy 1000hp

Playdough

Are you still running the stock LT1 block? IF so what all have you done block wise to help it support that much power???

BTW great numbers.

Pro Stock John

iTrader: (34)

I think SSblue has a QMP kit and was making a joke to Rob Raymer.

Intmd8 is your peak dropping or is it the same? When you putting the 2.73's in?

Also, I should revise my cam comment, how about 235/235 how much overlap would that have?

mongse

iTrader: (2)

Rex's blow apex seals before blowing the head (if you want to call it that).

Ronnie Duke's droptop makes well over 1K hp. I can only think of 2 LTx motors that have made 1000+ hp (Madman's Firebird & Baxter's SS).

Good numbers Jim. Ever thought of trying to get a number w/ a straight exhuast (no muffler, short downpipe)? With the size of the turbo, I don't think it'd be that loud.

Pro Stock John

iTrader: (34)

I know Jim has dynoed an open downpipe before. He's tried a lot of different things, he's the most creative 4th gen turbo guy I see on the web as far as trying things go.

Z8's has gone 159mph with a 3400 lb raceweight I'm thinking that's like 1100 crank hp (96 LT1 383ci hydraulic)

I think we will see non-C5R headed 1000 crank hp LS1 setups this year.

mongse

iTrader: (2)

That ain't no ****. I swear every week he's either changing the cam or exhaust housing.

Chicago Z06

Also, I should revise my cam comment, how about 235/235 how much overlap would that have?[/QUOTE]


the overlap would be determined by your chosen lobe center John.

Chicago Z06

congrats on the numbers Jim!!!! Hermez will be running this spring to keep you company against all the LSx's out here.... I have thought many times on boosting and you keep me thinking about it more and more...