Tuning

## TL;DR

* Available parts in Tuning Shop increases power, torque and value.
* Scraps increase value of common parts, and power, torque and value of tuning pieces.
* Scraps give a lot of work, very little increase the value and performance of the vehicle.

## Detailed Explanation

Replacing parts of the engine, clutch, transmission, exhaust, fuel pump and air filters is possible to increase the performance and value of the vehicle. These same parts if they are less than 100% durability will negatively affect performance and value.

Other items such as tires, rims, bodykits, seats and steering wheels only add to the value of the vehicle. Including the suspension any of these items that have a durability less than 100% will negatively affect the value of the vehicle.

All items in the engine bay that are not in 100% durability will negatively affect performace and the value of the vehicle, with exception being the Windshield Washer Reservoir (yes, ABS and Brake Servo can also negatively affect Performace).

In terms of gameplay, parts with durability less than 100% affect the vehicle's handling on the race track. The suspension is soft, the steering is loose, the tires have less grip and the car is slower overall.

To measure performance the dyno is used, which is one of the buildings that can be built in upgrades, it costs $20.000 and in addition to measuring power and torque, it is possible to adjust the gear ratio on the laptop in the back of the room.

The amount of tuning varies from car to car, even cars with the same engine can vary in performance from each other.

 Salem Spectre Fastback
 Chieftain TBX 2C

It is possible to see from the table that the three cars have different performance, and can be tuned to different levels (albeit close).
All three cars use the same engine, the "V8 2carb OHV", and the Bandit and TBX 2C use exactly the same parts.

## Scraps Upgrade

It is possible to increase the performance and value of the vehicle by upgrading the parts using scraps. When applied to tuning parts the power and torque also increase.
There are three levels of upgrade, each level increases a small percentage of the performance provided and the value of the part.

In the example below you can see the cost and benefit of an upgrade with scraps:

#### Supercharger (V8)

* It is important to note that the part after upgrade shows a percentage of 6.5%, but during dyno tests the gains exceeds 7%.

While this is possible it's not really financially viable for cars for sale, and personally the work involved in creating the scraps versus the benefit of increased performance doesn't make much sense.

Below is a detailed example, so you can draw your own conclusions:

## Example of Tuning

* **Stock:** An Olsen GTR AMC was purchased in the saloon, then 0KM and at 100% durability in all parts, this car uses the "V8 DOHC Supercharged" engine.
* **Stock S3:** All parts have been upgraded for stage 3, the car's value has gone up, but the power hasn't, as expected.
* **Tuning:** All available tuning parts for this engine were purchased (see *Tuning Parts* section below) and installed, the result was an increase in performance and value.
* **Stock S3 + Tune:** All tuning parts available for this engine were purchased (see *Tuning Parts* section below), then replaced the common ones on the stock engine with stage 3 enhancement. Performance has increased on the same level as the tuning engine, but the value is higher relative to it.
* **Tuning All S3:** All tuning parts available for this engine were purchased (see *Tuning Parts* section below) and upgraded for stage 3 and then installed on the upgraded engine in stage 3. The performance was the same as the normal tuning engine, but the value exceeded the previous ones.
* **Omitted items:** The following items have been omitted because they are not affected and do not change with engine tuning: Buy Price = $201,181, Body Value = $22,200.

## List of Used Tuning Parts

The table below presents all tuning items used in this engine and the percentage before and after the upgrade.

## Story Order

Some story orders will ask to increase the performance in X%, to complete these orders just add tuning pieces to reach the indicated percentage.
The confusing part is that it is not enough to increase performance in X%, it is necessary to increase in X + the wear of the vehicle.

For normal orders with me on Xbox Series-S in Easy mode, it is only needed to add the tuning pieces bought from the Tuning Shop. No need to bring the total performance up. For example, when fixing a Sakura GT20 Standard with an I6 DOHC engine, I bought a tuning Engine Head (I6) and two tuning Carburetors (2-barrel side draft) for a total of 16% tuning which grayed out and put a check by the "Increase tuning of a car by 14-19%." Pretty sure no need to worry about wear of the vehicle for normal orders and would assume story orders. I'll try and visit back if I see anything different. If someone can confirm, fix up this paragraph of mine and give correct information in the above paragraph, that would be wonderful.

To know the current performance of the vehicle is necessary to use Dyno, but first it will be necessary to repair any piece that is preventing the vehicle to start.

Although these orders are more easily completed using the the Dyno, its use is not mandatory it is possible to complete the order by changing the parts one by one until the goal is reached. Tuning should be within the indicated range in the order, any value below or above will prevent the completion.

* **Example:** The order asks "Increase Tuning of a Car by 10-15%", after run the car in the Dyno we see that the it has a decrease of -10% in performance, so it will be necessary to increase the performance by 20%-25% to complete the order.

The most economical and effective way to complete the goal is to replace exhaust parts, exhaust e intake manifold, throttles, carburetors, air filters, fuel filter and pump, fuel rail e ignition coil. If this is not enough the camshaft and the engine head are the next in the list.
Only choice the cheapest parts and add the percentage indicated in each piece until it exceeds the value that required.

* **Example:** Let's use the *V8 DOHC Supercharged* in the previous example, so an increase of 10-15% with a wear of -10%.

The great advantage of changing the parts of the Exhaust is that it was not necessary to spend a lot of time, because most of these pieces are not screwed, the cost remained relatively low and if the goal has not yet been achieved we have the option to change the Ignition Coils, Alternator and Power Steering Pump, all easy items to be replaced.

## All Tuning Parts

Below you can find the list of all tuning items available in the game and its value relative to the tuning offered.

Various engine and exhaust parts are sold at the Tuning Shop for boosting car's engine power, at various prices and efficiency. The table shows different parts' efficiency in terms of credits.