Chevy & GMC Vans

Just curious, where is the power band on my engine (L35)? Anybody know?

The blue lines are your powerband, and the red ones are if you had a Magnaflow muffler, according to Magnaflow anyway.

I'm guessing that the top lines are torque, and the bottom lines are HP. The numbers will be lower than expected if this is a chassis dyno.

5000 RPM?? Wow. I'm pretty sure mine spends most of its time below 3000.

According to GM, a stock late 90's 4.3 V6 has 190 hp @ 4400 rpm and 250 ft# torque @ 2800 rpm. I always found the van made the best power between 2500 and 4500 rpm's. Above 4500 - 5000 the power dropped off fairly quickly.

I've got a 2000. This is what wiki said:

Year Horsepower Torque Fuel System Compression Ratio RPO Applications
1999–2002 200 hp (150 kW) @ 4600 rpm 260 lb·ft (353 N·m) @ 2800 RPM SCPI 9.2:1 L35 7

2800-5600 RPM is a pretty wide power band, which makes sense, this being a torquey engine.

Actually the 200hp/260tq was only in the Silverado pickups. They ran dual cats and a free-er (how do you spell that?) exhaust system being 3" all the way. The M/L vans were still only 190/250.

LiftedAWDAstro wrote:Actually the 200hp/260tq was only in the Silverado pickups. They ran dual cats and a free-er (how do you spell that?) exhaust system being 3" all the way. The M/L vans were still only 190/250.

Interesting. Wonder why they didn't do that for the vans. Does it makes the engine drink more fuel too, or does it run more efficiently?

probably trying to achieve something close to "fuel economy".
gotta love the gubment cafe standards.

I would bet it has to do with room for the second cat on the driver side. In the AWD vans, there isn't enough room for the driver side cat.