Yes you can fit throttle bodies and a turbo, but the gains of bodies over using an inlet plenum are not that big enough to justify doing so on a forced induction lump…
What is ITB carb?
At the extreme, high performance cars like the E92 BMW M3 and high performance motorcycles like the Yamaha R6 use a separate throttle body for each cylinder, often called “individual throttle bodies” or ITBs. A throttle body is somewhat analogous to the carburetor in a non-injected engine.
How much HP does ITB add?
Add to that the cost of tuning, as well as any other modifications to get it running perfectly, and you could be looking at an additional $1,000 to $2,000, all to gain around 50 horsepower, on average.
Are ITBs worth it?
In an engine with ITBs, atmospheric pressure builds outside each cylinder, so when you open the throttle, air enters instantaneously. ITBs also help reduce pumping losses at partial throttle. The difference in throttle response is worth it in high-performance engines, but for normal street cars, it’s unnecessary.
What is the benefit of individual throttle bodies?
Individual throttle bodies not only offer superior response, but they also reduce these restrictions, freeing up power through improved airflow, with little to no trade off other than cost and increased engine noise.
How do I tune my ITB?
The most time effective way of tuning for ITBs is to perform dyno runs at a constant throttle opening, matching the column index TPS values. Note that the tuning range of throttle opening and rpm will depend on the dyno – but generally you can tune the bulk of the fuel table this way.
How do individual throttle bodies work?
With individual throttle bodies (ITBs), each cylinder gets its own butterfly valve regulating air intake, rather than all cylinders sharing one valve. When you apply throttle to an engine with a single throttle body, air has to travel further to reach each cylinder, slowing response somewhat.
Is a bigger throttle body better?
A larger throttle body delivers air at a higher rate than a stock engine, allowing the driver to feel an accelerating response from the vehicle sooner. In addition to increasing acceleration performance, larger throttle bodies can also boost overall horsepower.
Will a throttle body increase horsepower?
Gains from a throttle body can be dependent on modifications. Generally speaking, anytime a throttle body is added, there will be some added horsepower. The amounts can range from 5-25 HP depending on what other modifications are done to the engine.
Is a larger throttle body worth it?
Are ITBs reliable?
yes they can be reliable just have a good tune. put a filter on when you are driving on the itb. you dont want a rock going in and screwing up your motor.
Why no ITB’s on turbochargers?
This being due to the fact that ITB’s are usually accompanied by intake “trumpets” which would not allow for a seal between the turbocharger compressor outlet and the intake ports of the engine. This would not allow you to build boost.
Does a car with an ITB have an intake manifold?
Interestingly, ITBs also get rid of the need to have an intake manifold, as illustrated by the Chevy V8-powered Eisert Indy 500 race car pictured above. Still, many cars with ITBs–including the aforementioned BMWs– retain an intake manifold for better air filtration.
What are ITBS and why do they matter?
In an engine with ITBs, atmospheric pressure builds outside each cylinder, so when you open the throttle, air enters instantaneously. ITBs also help reduce pumping losses at partial throttle. Interestingly, ITBs also get rid of the need to have an intake manifold, as illustrated by the Chevy V8-powered Eisert Indy 500 race car pictured above.
Do ITB’s improve response to throttle inputs?
Ludo hit the nail on the head for sure. The marketing hype around itb’s is that they will offer improved response to throttle inputs. My own experience suggests this is probably marginal or at least any improvement is probably difficult to really notice unless you’re a professional driver.
