Quote:
Originally Posted by pearlhatchiroku
A bit of questions guys
1. does upgrading your IHE void the warranty? and to those who hav had theirs upgraded already how much milage did u have when u did the upgrade?
2. how much would be the gain in IHE upgrade w/ and w/o tune?
3. Is it even worth the 100k something for the gain, or is it more logical to just go w/ FI, either a low boost turbo, or SC w/ a low pully, maybe just to go around 230ish? but that wont happen until i put some serious milage on the car
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pearlhatchiroku,
1. Upgrading your IHE will void the warranty of your original IHE. The rest of your engine warranty will still stand unless the casa can prove that an engine failure can be directly attributed to the IHE modifications. Started upgrading intake and exhaust after the break-in period.
2. Just bolting on IHE will net you little gains. The 4U-GSE boxer engine doesn’t like bolt-on modifications and the stock ECU tune is the limiting factor as it is set to run significantly rich across the powerband to make the engine last longer. Installing a good quality straight 2.5 inch exhaust system: catback exhaust, catless front pipe, overpipe and the 4-1 catless header with no ECU tuning will gain you just about 8-12whp and 8-10ft-lb of torque. Compare that to ECU tuning alone to make the system run a little leaner on a completely stock system which can easily gain you 10-12whp. Tuning the ECU with the IHE should net you another 10-15 whp and 8-10ft-lb of torque for a total of about 18-27whp / 16-20ft-lb of torque.
3. It is more logical to go straight to FI as you will never really be fully satisfied with the gains from IHE and ECU tuning which will be hard pressed to break 200whp which usually requires leaning out the fuel mixture to near limits which would be detrimental to engine longevity.