"raise speed" is correct and usable in written English.
You can use it to express the idea of increasing the speed of something. For example, "I need to raise the speed of production in order to meet my quota."
(A classic is the Auto Party, organized in 1985 to raise speed limits and limit traffic fines).
"We know that speed kills, so if you raise speed limits, expect to see more highway deaths.
To raise speed still further, engineers on both sides developed faster motors and lightened their print-head mechanisms, while increasing the number of nozzles on their heads.
While mixer is running on low speed, gradually pour wet ingredients into dry, then raise speed to medium and mix until well combined.
Background: In 1987 individual states in the USA were allowed to raise speed limits on rural freeways from 55 to 65 mph.
For example, following the 1995 repeal of the national maximum speed limit, states began to raise speed limits such that by 1999, no state maintained the 55-mph speed limit on rural interstates and 34 states have raised speed limits to 70 mph or higher on some part of their roadway systems (Governors Highway Safety Association 2014).
China is to accelerate the development of its high-speed broadband network to raise speeds but cut prices, its State Council has said.
Yet many states are still raising speed limits, even as policy makers fret about dependence on foreign oil and emissions that heat the atmosphere.
But when it comes to raising speed limits, the cost in fatalities and the benefit in time saved can be known only well after the fact.
Under the 1998 law, which raised speed limits in the state provisionally and ordered the Department of Transportation study that was released today, the expansion of the increased limit will become effective in 60 days unless the State Legislature rejects it in a concurrent resolution.
This compensation speed of 3 cm2/mis is merely a maximum speed, which could be auto-tuned to adapt to the sample raising speed in order to keep the sample pressure constant.
