Westport Innovations (Nasdaq: WPRT) is expected to report Q1 earnings on May 2. Here's what Wall Street wants to see:

The 10-second takeaway
 Comparing the upcoming quarter to the prior-year quarter, average analyst estimates predict Westport Innovations's revenues will grow 5.1% and EPS will remain in the red.

The average estimate for revenue is $93.4 million. On the bottom line, the average EPS estimate is -$0.50.

Revenue details
 Last quarter, Westport Innovations reported revenue of $85.6 million. GAAP reported sales were 230% lower than the prior-year quarter's $88.6 million.

Source: S&P Capital IQ. Quarterly periods. Dollar amounts in millions. Non-GAAP figures may vary to maintain comparability with estimates.

EPS details
 Last quarter, non-GAAP EPS came in at -$0.66. GAAP EPS were -$0.68 for Q4 versus -$0.44 per share for the prior-year quarter.

Source: S&P Capital IQ. Quarterly periods. Non-GAAP figures may vary to maintain comparability with estimates.

Recent performance
 For the preceding quarter, gross margin was 32.1%, 10 basis points worse than the prior-year quarter. Operating margin was 62.9%, much better than the prior-year quarter. Net margin was 32.6%, much better than the prior-year quarter.

Looking ahead

The full year's average estimate for revenue is $452.4 million. The average EPS estimate is -$1.59.

Investor sentiment
 The stock has a five-star rating (out of five) at Motley Fool CAPS, with 1,836 members out of 1,879 rating the stock outperform, and 43 members rating it underperform. Among 325 CAPS All-Star picks (recommendations by the highest-ranked CAPS members), 317 give Westport Innovations a green thumbs-up, and eight give it a red thumbs-down.

Of Wall Street recommendations tracked by S&P Capital IQ, the average opinion on Westport Innovations is outperform, with an average price target of $34.75.

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