Why am I slow in iRacing? A checklist for finding lost time
You’ve put the hours in. You copied the setup, watched the onboard twice, and you’re still a second off the pace. It’s one of the most frustrating places to be in sim racing, and it’s where most drivers plateau. I sat about 1.2 seconds off the top of the MX-5 field at Laguna Seca for what felt like a whole season, convinced I needed a better wheel or some secret setup. I didn’t.
The good news is that the reasons tend to be the same handful of things, whatever the car. Work through the sections below roughly in order, since the early ones usually cost the most time and they also make the later ones easier to diagnose. You don’t need to fix all of it. Most drivers find that one or two of these account for the bulk of their gap.
Check your consistency before chasing pace
Before you go looking for speed, look at your spread. If your laps vary by more than about half a second, your “slow” lap time is really an average of some good corners and some mistakes. You might already have the pace in you, just not all in the same lap.
To check, run 10 clean laps in a practice session without resetting or pitting, and write down the best and worst. Ignore any lap with an obvious off or a spin, but be honest about the small stuff: running wide at one corner is part of the lap. If the gap between best and worst is under three or four tenths, you’re reasonably consistent and the time you’re missing is genuine pace. If it’s a second or more, consistency is your biggest problem and you should fix that first.
The reason this comes first is practical. When your laps are all over the place, you can’t tell whether a change helped. Try braking five metres later at Turn 1 and your next lap is two tenths quicker, but was that the brake point, or just a lap where you didn’t miss the apex at Turn 4? Until your laps cluster, every experiment is noise. The consistency guide has a routine for tightening that spread, and it’s worth a week of your practice time before anything else on this list.
Inconsistency also tends to come from trying too hard. If you’re attacking every corner at 100%, the laps where it works are quick and the rest are messy. Backing off to about 95% often makes your average lap faster, which surprises people.
Minimum corner speed is usually the big one
This is the most common problem I see, especially in drivers in their first year or two. They brake too much. They slow the car more than the corner needs and then wait for it to turn, and the waiting is where the time goes.
You’ll recognise it from the cockpit. Corners feel safe and controlled, the car rarely feels like it’s on the edge, and you finish a lap thinking “that felt tidy” and then see the lap time. Meanwhile faster drivers seem to float through the middle of turns, carrying speed you’d swear wasn’t available. In a low-power car like the MX-5, the Formula Vee or the GR86 this costs you enormously, because you can’t make it back on the straight. There simply isn’t enough power.
The fix is to carry a little more speed to the apex, one corner at a time, and to accept that the car will feel busier. Pick one corner, something medium speed where a mistake won’t end in a wall, and try arriving 1 or 2 km/h quicker each few laps until you find the point where the car won’t make the apex. Then back off a touch. That point is usually further than you think.
Telemetry makes this easy to confirm. Find the lowest point of your speed trace in each corner and compare it with a faster lap in the same car. If you’re consistently 3 to 5 km/h slower at the apex, you’ve found your problem.
Braking: where you start and how you let go
Braking problems split into two parts. There’s where you start braking, and there’s how you come off the pedal. Most people obsess over the first and ignore the second, when in my experience the second costs more.
The release
Plenty of drivers brake hard in the right place and then let go of the pedal all at once, right before turning in. When you release suddenly, weight shifts off the front tyres just as you ask them to steer. The car understeers, you add more lock, it pushes wider, and you’re late to the apex. Then you’re late on the throttle too, so one abrupt release costs you through the whole corner.
The fix is learning to trail brake: easing off the pedal progressively as you add steering, so the front tyres stay loaded into the corner. It feels strange at first, and in a car like the Skip Barber or the Ray FF1600 you’ll get the odd spin while you learn where the limit is. Our trail braking guide has drills for it. Give it a few practice sessions before judging, because the first ones are usually slower while your feet relearn the timing.
The brake point
The other half is where you start braking. Many drivers pick a reference point on their first few laps and never move it, so they brake 20 metres early forever. Others brake at a different place every lap because they’re going by feel. Both lose time, and the second one also wrecks your consistency.
Pick a solid visual marker, a board or a kerb or a change in the tarmac, and move it in small steps until you find the limit. The brake points guide goes through how to do that without binning the car. In a GT3 car at Monza, for example, the braking zones into the chicanes are long enough that a few metres each lap is easy to test safely. Once you’ve found the limit, move back a metre or two so you can hit it every lap under race pressure.
Late throttle and slow exits
A messy entry means you spend the middle of the corner waiting and correcting, so the throttle comes late. Whatever speed you lose on exit, you carry all the way down the next straight. That makes this one of the most expensive mistakes you can make, particularly before a long straight like the Kemmel at Spa or the back straight at Road Atlanta.
From the cockpit it feels like the car won’t let you have the throttle. You get to the apex, it’s still pointing at the outside kerb, and if you open up now you’ll run out of road. So you wait, dribble some throttle in, wait again. The instinct is to work on your exits, but the exit is usually the symptom. A clean entry usually fixes a late exit by itself, because the car is already pointed down the straight when you reach the apex.
When the entry is genuinely fine and you’re still hesitant, look at how you’re applying throttle. Stabbing it on in a GT3 or GT4 car overwhelms the rear tyres, and even with traction control you’ll lose drive. Feeding it in progressively and getting to full a little later can be quicker overall than a big stab that triggers wheelspin.
A useful test is to pick one corner leading onto a long straight and do five laps where you deliberately brake a bit earlier and focus only on getting to full throttle sooner. If your time at the end of the straight improves, exits were costing you more than entries were gaining.
Track width and the line for your car
Watch a fast lap and notice how close the car gets to the edges on entry and exit. Leave half a car width unused on each side and every corner gets tighter, which means lower speed everywhere. This is most obvious on exits, where fast drivers let the car run all the way out to the kerb, and sometimes onto it.
Use the full width on purpose, especially on exit. In most iRacing sessions you only pick up an off-track incident when all four wheels leave the racing surface, though some tracks and series police limits more strictly, so check before assuming. Newer drivers are often scared of track limits and leave a metre of safety margin everywhere. On a short track like Lime Rock or Summit Point that margin adds up quickly.
The line itself also depends on the car. A line that works in a GT3 car can be wrong in a Formula car or on an oval. Low-grip, low-power cars reward carrying speed with a wider, rounder line, while high-power cars reward a later apex and a straighter exit so you can use the power sooner. If you learned Watkins Glen in an MX-5 and then jump into a GT4, some of your old lines will feel right and be slow.
So watch onboards in the exact car you’re driving. The right track in the wrong car won’t help you much. The racing line basics post explains why late apexes win in most situations and when they don’t.
How you practise matters
If you try a later brake point, a new line and a different gear in the same session, you’ve got no way of knowing which one helped, or whether two of them helped and the third made things worse. I spent a whole season doing this, changing four things a lap and wondering why I never got quicker.
Make one change per stint. A stint can be 10 laps, or however long it takes to get a clear picture. Keep what helps, drop what doesn’t, and write it down, because you’ll forget by next week. Pick your worst corner, work on it alone, then move on.
It also helps to practise in a way that looks like racing. Hot-lapping in an empty session is useful for technique, but your race pace comes from doing it with fuel, worn tyres and cars around you. Once a change feels natural in practice, do a long run to see if it holds up.
Finding your specific problem
A checklist gets you started, but everyone’s biggest weakness is different. One driver’s gap is all minimum speed, another’s is braking 15 metres early at three corners. Comparing your telemetry against a faster lap in the same car is the quickest way to find yours, and our guide to reading iRacing telemetry shows you how.
That comparison is the core of Sim Sense, an iRacing coaching app. It scores your driving across 26 skills corner by corner and ranks what to fix first, with a lesson and drill for each weakness. The telemetry analysis is free, and it’s in early access now.