foler

Anybody have info about idle quality and official dyno curve like this (http://www.crateenginedepot.com/imag...229_dyno.jpg)?

Anybody can explain me how to read camshaft specification?

Engine:
http://media.gm.com/content/media/us...Nov/1101_crate

thanks

Dyno Junkie

That's a very low lift camshaft for an LS3.


I'm running a Comp Cam 231 239 113 .617 .624 in my daily driver.

foler

what this mean? my car will be dd.

KING Z28 HAWK

iTrader: (11)

Give this a try its a really good read.
https://ls1tech.com/forums/generatio...cam-guide.html

allblowdup

Here you go. Idle quality is good.

garcr4

iTrader: (1)

The CT 525 motor was designed for circle track racing and is starting to gain some traction especially in Dirt late models.
It is a carbureted motor. It appears they now have a version with the stock FI.

The ASA hot cam used in it worked well in the Lingenfelter built LS1 motors for the old ASA Delco National Tour short track series. The same cam is used in many LS1 SCCA GTA road race stock cars. It was introduced in the late 90's.
The cam performs better than the specs would indicate for circle track and road racing, but you must remember it is a design that is about 15 years old now.

foler

I dont think so that ct525 is the same engine as ls376/525.
Design is maybe old 15 year, but what is changed in nowadays?

garcr4

iTrader: (1)

I just noticed that they are now advertising a 525 with FI, at one point they called it 515 HP with FI.

Same basic motor save for the CT set up for carb, and has ATI dampner and Circle track oil pan etc.

My point was it is a pretty stout little cam despite the relatively low lift, I think at the time the engineers were looking for something that would perform well in circle track application but still be very easy on the valve train.

GM wanted to showcase the durability of its' new LS motor. The ASA series had been previously using 500 plus HP GM V6's that were hand grenades.

allblowdup

The cam works well because of the heads. The heads have great low lift flow so they still produce decent power with low lift cams. We have run the ct525 engine on a few engines to over 50hrs at WOT at 6100 rpm with most periods lasting 30-40 min. When we do take them apart after that they are completely worn out though. Still crazy cause a purpose biult 360 ci sbc with good parts usually only lasts us 20 hrs max.

garcr4

iTrader: (1)

This jives with what I have heard several respected engine builders say, that LS motors can run three times as many laps before needing a rebuild as compared to conventional small blocks.

The ASA hot cam also worked well with the stock 853 LS1 heads in the ASA lingenfelter motors. With few changes other than valve springs, ECU tune and headers they made 400 to the wheels.

foler

So, conclusion is that this engines can be good for 100.000 miles on street use? I will change oil every 3000 miles and want some reliable engine like bmw ///m.

allblowdup

The engine id pretty much the new Camaro engine with a different cam.

cspecken

Tried to get pricing from my local GM shop but they do not have the details yet. Looks like Pace has them listed on their site. Might have to consider this for my GTO project, was looking at going with the ls3/480 but things may have changed!!!

Still need to look into other LS3 builders like Mass, Turn Key, and Katech. Just curious if anyone has done comparisons $ for $, hp to hp and warranty to warranty with these builders and GMPP. If so I would be interested in your findings.


Thanks in advance, Chris

foler

All this manufacturers charge to much money for their products. Clear examples is wiring harness. For 900$ you get entire kit from gm for run engine (http://paceperformance.com/i-6255493...s-sensors.html) but manuf. like speartech charge you 1200$ only for wires?! Turnkey have ls3 480hp for 10.800$ (http://www.turnkeyenginesupply.com/p...P.html):judge: For that money you can have gm ls3 with long tube headers, race oil pan, custom tune, gearbox, clutch.......GM is way to go.

cspecken

Great thanks for the information.

vstol

LS376/525 is with manifolds, what do you think the increase would be with
1 7/8 headers, 560hp? Anyone running one of these
Thanks

http://forums.corvetteforum.com/c3-t...ica-kinda.html

DubNova

Is the idle ok for a street cat with power brks? The cam doesn't look that big but, sometimes numbers can fool you. I have a t56 in a Chevy II.

scphilli

iTrader: (2)

It should idle fine on most street car applications but power brakes might be a little too much for it.

foler

Where I can find info about emission test for this engine? I need numbers for CO,
CO2 and other gasses etc...

I need this numbers to pass:
CO idle up to 0.50
CO medium 2500rpm up to 0.30
Lambda 2500rpm 0.97-1.03

thanks

allblowdup

i don't think that it would pass those emissions. The cam is 110 l/c and gives a noticable lope at idle. I guess it is possible.

The 525 hp from GM is with headers but is a reserved number. they make 550-560 hp. std corrected on a typical dyno.