Dynoed a Z28 today...

1 Bad Burb · December 6, 2003

Took my buddies auto 95' Z28 LT1 for a dyno run today. I was surprisd, only 243 rwhp and 291 rwtq. only mod is a K&N. it hauls butt on the expressways. But on a positive note, a 97' Z28 LT1 put down 291rwhp and 321rwtq. he was a manual with K&N and borla cat-back. but yes, fun day indeed. just thought i would post results for ya incase u ever wondered.

Aj

The SPEEDY · December 6, 2003

Was the 95 an a4? I would like to get mine dynoed someday. Probably after i get a cam in it.

CMNTMXR81 · December 8, 2003

Speedy, he says auto.

Well, in 1995, the LT1 was rated at 275hp, factoring in the loss factor (I use 15% for all intents and purposes...it could be more, could be less) the calculated rwhp would be 233.75. So 243 doesn't look all that bad. But I will say, I've personally seen many near stock LT1's dyno anywhere from the 240's to 260's.

The reason it hauls on the highway is that the A4 cars came with a 2.73 gear which is more condusive to top speed.

Bharnz · December 8, 2003

I had my Z dynoed before and after my header install.

not to bad, gonna cam her next.

www.boomspeed.com/bharnz/nite.jpg

CMNTMXR81 · December 8, 2003

Bharnz, you're here in Chicago????

Did you have Jim tune it on the dyno or was that just a set of pulls?

Chris97K1500 · December 9, 2003

Yeah, you might be disappointed with those #'s, but if you look at what the main competition was at the time. The Mustang only had 215hp, which means it was probably in the 180rwhp range. It's all relative to the time period. And one other thing, not all A4's came with 2.73's. My Brother's A4 came with 3.23's, it had a "high" performance package. Bone stock I had it pegged below the 150mph mark. Nice performance for a $27K car! Chris

CMNTMXR81 · December 9, 2003

The 3.23's were an option though. Otherwise 2.73 in an auto is the base gear.

The SPEEDY · December 10, 2003

Mine is rated around 290hp / 305 ft lbs . I'm just happy to be running with stock a4 ls1's.

d**n 10 bolt pisses me off though. I need to pick up some new c-clips.

hogger999 · December 15, 2003

I'm willing to bet that the 95 Z was dynoed on a Mustang Dyno. They always give a lower number than a Dynojet. Because they factor in real world resistance, they are suppose to be more accurate.

422 SS · December 15, 2003

I'm willing to bet that the 95 Z was dynoed on a Mustang Dyno. They always give a lower number than a Dynojet. Because they factor in real world resistance, they are suppose to be more accurate.

You are correct about a Mustang dyno being more accurate than a Dynojet especially in a forced induction application.Having said that the dynograph posted is clearly a Dynojet and very normal for a LT1 car.A good rule of thumb for LT1 cars is 240-265 rwhp,LS1 cars 295-320 rwhp.The later model years of each engine produced more rwhp.