whats a turbo buick's powerband look like?

[Vendor Defendor]

i was just wondering what the power band for a relatively stock internal LC2

the reason why this came up in my mind was i was thinking that the stock LC2 makes (supposedly, we all know it was more, but anyways) 355 ft/lbs @ 2000 rpm's

and, if you are at WOT, you dont see 2000 rpm's for long, even when the transmission shifts. so, that makes me think that the engine has a realatively broad power band

any ideas? or thoughts on this?

thanks

 

[Sleeper-6]

As far as I know, you're on the right track. Our engines have a real wide powerband, once the turbo spools, it's torque city until you let out of it. Not like a high-winding small block that makes all it's power between 5000-6500 RPM but is a dog before it's wound up.

 

[BlackBeauty]

I have a strange looking dyno chart check it out. There's a dip around 4250. Also notice that the graph starts at 4k rpm's, I would've liked to know where that ski slope of a tq. curve started.

This is with TE-44, 21psi on an RA 93 chip, Mease DP open dump, bluetops, RJC PP, plus the usual. I was hoping for more. The convertor wasn't locking, and since then I've replaced the coilpack, got the header crack welded, got the tc to lock, etc.

 

[UNGN]

Peak torque is the lowest RPM that the Turbo is making full boost. It's slightly downhill from there until a little over 5000 when torque nosedives off a cliff.

Horsepower is Torque X RPM X a constant: (1/5250)

 

[madhat]

when I first started looking into these cars, I read that the torque peak was a 2000rpms and the horses max out at 4000rpms, which makes a great street car...but what I dont get is when I read about GNXs, their power peaked at 3000 and 4400rpms. I would think that the ceramic impeller, etc... would mean they would have a LOWER torque peak than just a GN, why are they quoted so high?

 

[buickpower]

the regular gn made peak torque at 2800, so 3000 is not that far off for the gnx...

 

[buickpower]

link

this is the stock power/ torque curve power curve

 

[buickpower]

as a side note, the guy who owns the site listed the torque to be max at 2000, but if you look at the graph, it is clearly closer to 3000, about 2800

 

[Vendor Defendor]

Originally posted by UNGN

Horsepower is Torque X RPM X a constant: (1/5250)

i thought it was:

hp = tq x rpm
------------------
5,252

and using that you also come up with every engine makes the same amount of torque as horsepower at 5,252

thanks for the info guys.

 

[LikeMy6]

My dyno sheet shows peak power from 3900 thru 4400(nearly a flatline) then starts falling off. This was totally factory original. without locking up the TC. Torque peaked before 3000 and fell roughly 20ft#'s per 200rpm there after.