that240guy

My 260z with the 3.545 ratio, T56, and LS1 engine gets 30-33 mpg on the highway. I get high teens around town. My car is light though. 2350 lbs. A stock weight Z prolly would still get almost 30 on the highway.

the problem with the cheaper stand alone ecus is that you are not going to get the great gas mileage out tof them that you might desire. They are awsome for making all out power and for driveability, but they don't have cruising tables whereas an LS1 or LT1 computer has tables that will slowly continue to lean out your engine to a point where the computer thinks its safe. I am not sure what you were trying to say about the LT1 fuel injection, but it would be almost impossible to adapt LT1 injection to an old SBC. The LT1 recieves its injector firing signals from the optispark distributor that has a 360 degree optical wheel in it. They work great, but you wouldnt be able to retrofit an opti to an SBC. You might be able to design a wheel that you could attach to the crank and run it like that.

at high power levels, the 4l60 is a pile of crap too. The T56 can handle more power than a stock or even most aftermarket/hipo rebuilt 4l60s. If you are looking for a good tranny and you are drag racing, get a th400 and be done with it. But if you like shifting gears, a T56 or a tremec TKO should be in your future.

if the motor came out of a car that didn't have z rated tires, thats your speed governor. I had a 94 formula that came with h rated tires that cut out at 115 mph i think. So with the little tires that a z has, that would probably be around 90 mph or something like that. Get your computer tuned and have them max the governor out. I think you can set it to 255 with an obd1 lt1 computer.

you shouldn't be doing burnouts with a stock rear end. The rear end is the weakest link in the car. The first day that i got my car running, I broke the rear diff mount. After I put the solid mount in I destroyed 2 diffs before converting to an R200.

Looks to me like a band aid for a poorly built engine that can't keep oil pressure up.

you shouldn't need too much power to slay a cobra. I am running a stock ls1 and my car weighed in at 2420 lbs. My car runs pretty even with my buddies 03 cobra that has a small pulley, tune, and a ported blower, and all the other little things like cai and exhaust. I have run a better 1/4 mile time though cuz my car does launch a lot better. My best is a 12.03 and his was a 12.20 or 12.30. I don't remember.

a ford mustang throttle body will extremely choke the Victor junior manifold. Unless you are running a very large aftermarket ford throttle body like an 80+ mm. If you are that cheap, why don't you just put a carb on it?

172 mph going downhill on I-10 West about 45 miles before the California border. Verified by my passenger with a Garmin GPS. Stock body. Stock suspension. LS1 T56. 2420 lbs. wet. This was with 3.545 gears and just shifted into 6th. (redlined 5th). I backed out cuz the car got real boaty. Almost felt like speed wobble on a motorcycle. Oh and by the time I got to Los Angeles, my driveshaft had rattled all the U joint bolts lose.

The cam I mentioned used a comp spring also. I don't remember the part number on the spring. We just called comp and told them what cam we had and they sent us the appropriate springs. The rockers are stock though. The cam isn't big enough to need slotted rockers or anything fancy. About a year back we did a Llyod elliott heads cam package on a 1996 LT1 and also did an OBD1 conversion. We used the stage II heads with a stage III camshaft and longtube headers with a BBK throttle body. On the dyno it put down 405 hp and 390 torque. Nice set up, I just didn't like revving the stock bottom end of the LT1 to 6800 rpm. And I know the Optispark doesn't like it either.

I paid $100 for mine, but it took me about an hour to get past the language barrier with the guy. NO HABLA ESPANOL! Anyway, I was kinda scared to run the 100 dollar driveshaft, but the car has gone 160 mph on it and I have about 1,000 miles on it now and no problems.

Hold on there. You need to rethink that combo. The T5 is not a direct bolt up to the LS1 and it cannot handle the power of the LS1 anyway. Second JTR does not make an LS1 mount kit. Lastly, block huggers will not work on the LS1 in a Datsun as the Hooker block huggers would be running right into the JCI kit and/or the steering shaft. Lastly, straight pipes will get you pulled over very quickly. I have a 3 inch exhuast with a Summit brand 3 inch turbo muffler on it. It isn't too loud and sounds pretty good, especially at wide open throttle. And it isn't loud enough to get me a ticket. a single 2 1/2 inch exhaust would extremely choke an LS1.

the cam that I mentioned is in the Summit Catalog in the F body section in the back. The part number is cca-07-503-8. And to correct my last post, the lift is actually .503/.510. But I would not dare spin a stock bottom end LT1 over 6500 rpm for any period of time. You are asking to blow the rings out and start consuming oil or even worse, spin a rod/crank bearing. The cam I mentioned peaked power at 5400 rpm making 6000 rpm shifts perfect. Anyway the car idles pretty darn smooth. I havn't heard a hotcam in a few years but if my memory serves me correctly, it sounds about the same. But as far as stock heads go, going bigger than a cam like this won't net any more power. This cam that we use on all of our stock headed LT1s is pretty nice.

most stock LT1 engines that I have seen on the Dyno put down anywhere from 235-275 hp at the wheels depending on if it is an auto or a stick and mileage of course. I just finished installing a brand new LT1 in my friends 95 camaro. The motor is all stock with the exception of a comp cams 224/230 .501"/.510" on a 112 and a set of hooker shorty headers. We put it on the dyno and started tuning it with Cat Tuners and made 338 hp at the wheels. I don't know if painless is advertising that number as a flywheel or rwhp number. Either way, it is an extremely expensive package. Why would you need a new harness and computer? The stock computers and harnesses are abundant, very cheap, and very tuneable. And cams arn't too expensive either. $1,700 sounds like a joke to me.

You can block the passage off on the LS1. It won't hurt anything. THe racing pumps for the LS1 do not even have the heater passages.