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1,070 Posts
Discussion Starter #1
I took my car to a dyno today, and I noticed a difference in boost between 3rd gear pulls on the dyno and WOT runs on the highway. I had my boost controller set to 18psi, according to my previous runs from standing starts and WOT runs. But when I used those numbers on the dyno, they only gave me 15 psi of boost. Just to make sure I wasn't leaking any boost, I floored it on the highway and I did hit my usual 18 psi. Is that difference between 3rd gear pulls on a dyno and dead stop runs normal? The dyno pulls were started at 3,500rpm on 3rd gear in my auto.

Some background:

93 auto
stock torque converter
stock twins
3 row FMIC
-4,+1 cam gears
4" exhaust
HKS twin power
Iridium plugs

2,576 Posts
On the highway your car has real loading on it from its full weight, rolling resistance and wind resistance. Plus, a difference in air temp can affect your peak boost substantially, that's why turbo cars are so much stronger on cold days.
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