lancelot1

What would be a good estimate of the lt 1 naturally aspirated horsepower limit without seriously affecting driveability and fuel economy?

Scudz

460

bigsapper

Hahaha. ^^^^^

Add the GM Performance Hot head & cam package with E85 conversion. Solid package at about 550hp.

Nexxussian

Big S, do you know of a thread about that?

I keep reading it would be roughly a 100 hp gain, and had expected someone would have documented the build, but I haven't found it.

bigsapper

Check the Camaro6.com forum. A few over there have done this package.

Higgs Boson

without seriously affecting driveability or fuel economy.

a decent cam affects driveability. E85 affect fuel economy. So basically, bolt ons.

475 rwhp give or take. technically you could make 800 hp NA if you went full on race mode.

marcouvo

8-speed car maybe 450 peak rwhp with bolt-ons without E85.

leadville1

My car is 100% driveable, I have a VVT2 Cam kit from Texas Speed, MSD intake Manifold, ARH headers and Halltech intake. The car made 515whp on a Mustang Dyno.

The shop that did the work said it was the highest hp NA LT1 they had seen. It made about 390 whp stock.

Higgs Boson

people's definition of driveability varies wildly. a surprising number of people complain about the idle of a bone stock corvette....

JHEBERT

Those snowflakes shouldn't be in a vette...

Higgs Boson

they aren't.

Elite275

I agree with the drivability comments. I thought mine was extremely drivable if you wanted to daily it in traffic when I was NA at 550rwhp. When it's cold it just needs to warm up a bit. As Higgs mentioned though, some people think the car stock idles, drives and shifts terrible when cold so there is a variance from person to person.

mittens

I am hoping for over 500 rwhp, fun driver, and a lopy idle... this is the slowest car I have had in a Long time currently ha Funny to say that about a intake and headers C7 corvette. But before this was a 417 stroker LS3 C6 (535rwhp), then before that a Heads Cam Blower C5Z (660rwhp), before that a 431 LS7 C6Z (520RWHP)... I can keep going back another 4 cars in similars builds.

So needles to say a stock engine thats smooth at idle and is not kinda roudy feels like I borrowed my moms vett. Looking forward to having the new fetures of the C7 (AC seats, mag ride, bluetooth, rev match, you name it) but with some roudyness too.

Car is going to be taken apart in 5 days....
mods will be AFE intake, BTR Stage 2 cam, Kooks Headers & Off road X.

bigsapper

Lol. Yeah I guess E85 wouldn't make the economy requirement, although it works out cheaper overall for me.

bigsapper

Also, the Chevy Performance hot cam/head package is used in the LT376/535 crate engine, which is rated at 535 crank HP. So all other things being equal with the LT1, that package is apparently worth 75hp.

Nexxussian

Yes, I found a Super Chevy / Hot Rod (don't recall which at the moment) article about it.

I figured the extra 25 HP you mentioned was from the potentially hotter Flex Fuel tune, when it was running E85.

Seems reasonable.

I found several threads about the hot heads and cam, as well as many on other ported or aftermarket heads and cams on the forum you mentioned (Camaro6.com forum).

Sadly, the threads on the GM components also seemed to be the ones with the greatest dearth of dyno confirmation.

That happens though, not everyone cares about numbers.

I like numbers specifically because they relate directly to other numbers, specifically numbers with funny symbols by them. ($, £, €, etc.)

That's why a baseline is so important to me, with limited funds I need to know where I'm starting from so I can plot the most cost effective course to my end goal, regardless of the project at hand. (Corvette, Hot Rod, sleeper, ... ).

It has everything to do with deciding if something will be an end result, or a supporting modification for later advantage.

mittens

I will not have a baseline for my car. while it would be nice, I am not going to spend money to dyno a stock car, then install headers and intake tune it, redyno it, and then have cam done and retune and dyno again.

So Finaly numbers with this set up is what I will have. is what it is. I wont even have intake and headers dyno becasue the car is not tuned for them anyway, and pointless to do all that to redo it in 3 days when cam is done.

mittens

Thats good on the Tq nromaly from what I have seen the cars making 500-520 ho the tq is still down 465-280 tq.

Nexxussian

Not trying to pick nits, but is that supposed to be 480?

If it is 280, I would be curious about that build as I expect they were intentionally killing torque, and I occasionally compete at traction limited venues, hence adjusting torque while maintaing horsepower is interesting to me (especially a nearly 200 Lb ft swing ).

Yes, I could guess, but I find it interesting to see how others do things.

mittens

yes type 465-480 tq.