Race cars in
AO Silver Member
Join Date: Oct 2007
Location: South Africa
Hi Alessio, nice project coming up.
1. When it comes to boost levels in an unopened OEM motor, it is all down to knock / detonation prevention. It is mostly managed by pulling back the ignition advance. 0.5bar is safe without pulling out to much spark advance and not having active knock detection. 0.7bar is safe with active knock detection.
B. Another easy way is enriching air fuel ratio.
C. Lowering compression (but that means motor open)
2. Taking 1B (above) into account, over 0.2bar, the standard injectors will run out of duty cycle (maxing out). Adding fuel pressure to the fuel rail only helps a little, bigger injectors or more injectors are needed to provide more fuel at higher boost. If you get "SLIGHTLY" bigger injectors, the stock ECU could probably compensate, but a remap would be needed for significantly bigger injectors. The other option is to add secondary injectors with a small fueling ECU just before the throttle to enrich the air when in boost. It also helps cooling the air intake.
3. There are a few turbo TS motors out there, but not enough. Brent built a spectacularly strong TS motor in conjunction with Turbonutters, but he went more towards the built motor side with forged conrods and forged, lowered CR pistons. TBR racing, Clive Dension racing has strong Nord turbo motors, but that is a whole different fish to fry.
4. Jtdm (16V) exhaust manifold is perfect, so is 1750 tbi. Diesel motors only rev to 4500rpm and needs to be on boost at 2000rpm so their turbos are SMALL, It won't work in a petrol 2.0 environment. The 1750 turbo can work for a low boost application in a 2.0TS. Best to look at other options like volvo / subaru / opel