Reigning British Touring Car Champion Gordon Shedden believes Honda are about 4-5 mph too slow down a straight-line as the Team Dynamics driver aims to get his title challenge back on track at Snetterton.
Shedden heads into the second half of the season sitting ninth in the points standings someway off championship leader Sam Tordoff after enduring a torrid run of luck in recent rounds.
The Honda Civic Type-R driver hasn't stood on the podium since Donnington Park where Shedden took second behind his team mate Matt Neal in the final race.
"We just need more straight-line speed," Shedden told Crash.net. "We're 4-5mph too slow but we're working on it. We're trying to push the boundaries more and more but we've got what we've got. We should be quick because we don't have a lot of weight.
"We just want to be able to do race. It's difficult at the minute and we'll keep working at it but there's a limit to what we can do."
With qualifying in mind, an engine change between the two practice sessions has put Shedden on the back foot ahead of the 30-minute shootout.
Much of Shedden's title crusade during 2015 was typified by his ability to pull a lap out of the bag while carrying a full compliment of ballast. But the 37-year old says achieving that this season has proved a tougher proposition.
"I've got no idea [what I would be happy with in qualifying]. It could be anything, couldn't it? We'll give it our best. We've only got 15 kilos but this is the thing. Last year we were able to compete with 75 kilos but now we can't get near with 15," Shedden continued.
"I only got a bit of running because of that [engine change]. We haven't had a new tyre run yet so we've still bits to do. We're going into qualifying a bit blind really."