so cal mark
True Classic
We installed our new header and exhaust system on a stock 1980 FI X. No mods to the engine whatsoever. I had the car dynoed for a baseline, then again after the header installation. The results were very good, with a 10% increase in peak hp, but a 15% increase in the upper rpm range when stock hp is starting to decrease.
Max torque increase was 10% but that doesn't tell the whole story. Stock trim peak torque occurs at 3k rpm, but with the header peak torque moves to 4200rpm and continues flat as torque drops off in stock trim. At 4200-4500rpm torque is 15% more than stock configuration.
I'm posting the copy of the two dyno runs. As you can see at 6500rpms, the header is making 9hp more than the stock exhaust.
Anyone have figures for headers from other vendors?
Max torque increase was 10% but that doesn't tell the whole story. Stock trim peak torque occurs at 3k rpm, but with the header peak torque moves to 4200rpm and continues flat as torque drops off in stock trim. At 4200-4500rpm torque is 15% more than stock configuration.
I'm posting the copy of the two dyno runs. As you can see at 6500rpms, the header is making 9hp more than the stock exhaust.
Anyone have figures for headers from other vendors?