Originally Posted by
onyd Where did you get the T25 from? Can also be small for your engine running 12 psi. If he can't get the gasses out of the cylinders, you will build up pressure and choke the exhaust. Also compressor size can be small. You can have lost of boost but still no air flow if the turbo is working out of his turbo map. You can raise the boost but only generate heat (and this give you a higher boost reading). Had this before. I suggest you use something like a Sierra Cosworth 2WD turbo (or the bigger one from the first 4X4 Escort if you go drag racing). Unless your T25 is modified or Ball bearing type. Cosworth turbo work fine, I prefer to use a 0,63 AR on the exhaust instead of the original 0,49 AR from the Cosworth. Just to keep the exhaust side cooler and save valves.
Most turbo setups upto 700 mbar are easy power makers with little to no risk. If you go higher you must pay attention. 18 psi is something good for Santa-Pod but can be to much as a daily driver. Lucky you have never broken a piston land. But you can make it save again using water/methanol injection. I've been using it more than once on blower setups. They generate so much torque low in the revs (1500 RPM and almost max torque), just where pinking starts so easy. Usually turbo's start making turbo pressure late enough for not being in this danger zone but still they can. The simple version with windscreen pump is all you need. Start spraying when boost set in and OK. Believe me it does miracles.
Ever measured the power of your engine?
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