TD 998 big turbo upgrade recommendations
TD GAP big turbo / TD MOD stock hardware requirement list: 250-550HP
1-TD Multimap ECU reflash
2-TD Flasher or Copitrail (allows flashing of ecu tuning and datalogging if equipped with option)
3-Closed Loop (keeps sled running optimal air fuel for better economy, better power consistent performance and improved response.
4-Map sensor upgrade (4 bar) (allows ECU Reading above 17 psi of boost)
5-1050cc Injector Dynamics kit
6-TD wideband o2 Kit (needed for Closed loop operation, it reads air fuel ratio)
7-TurboSmart Blow off valve
8-Fuel pump upgrade
9-Adjustable fuel regulator upgrade
10-TD Cold air OR Gap Ram air (gap ram air more power for race sleds
11- Dalton Clutch weights for power level under 350HP or Tapp Clutch for power level over 350HP (STM clutch weight also works)
12-Torsion conversion kit or STM secondary clutch for power over 350HP
13-retainer and spring upgrade for cylinder head (high rpm reliablility) as the big turbo makes power at 9200-9600rpm you need those.
14-Big 4 wheel kit. This is safety thing, the extra power will for sure not work with only the factory two plastic wheels in the back.
15-For Power level over 400HP is mandatory to upgrade to Carrillo rods at the very least. We have a lightweight set or a regular set. We also recommend doing the forged pistons if going above 430HP with a maximum compression ratio of 9.0 to 1. You can upgrade your Pump gas power limit by going with a lower compression piston set (we have that in stock) of 8.5 or lower. This will allow more boost and power on pump 91 octane fuel. For race sleds stick with 9:0 compression.
16-For power levels above 360HP we strongly recommend our HD head gasket with HD head studs
recommended upgrades:
1- TD stage 6 camshafts (keep in mind with TD Stage 6 minimum boost is 26 psi on the TD GAP big turbo kit). The TD mod stock will work fine with TD stage 6 at lower boost level and on pump gas. Therefore if you plan to trail ride the TD GAP big turbo it's better not to run the TD Stage 6 unless you plan to run a mix of race fuel with the pump gas as min boost of 26 psi requires high octane.
to review do not use TD stage 6 if you plan to run the TD GAP big turbo kit on the trail on pure 91 octane (you can use 91 + c16)
Stock cams are best for 91 octane pump gas trail use on the TD GAP big turbo kit
For the TD mod stock you can run a TD Stage 6 or stock cams no problem at any boost level.
2-TD Super cooler kit:
Improves HP greatly and also a much more consistent performance and Pull that never stops (cooler intake temps and less knock)
3-TD header
Much more power than stock manifold
More power on pump gas at same boost level
4-Datalogging option for the TD flasher or Copitrail