gti 130 wow
Member
I know their have been a lot of posts on this subject , but I think I may have something to add.
Up to the 1990es , the highest compression you could have on a engine using 87 gas was around 9.3 to 1 . Also when running high test which in fact would have been considered regular back in the 60es , their was limits.
Higher compression came with the introduction of the ecu and knock sensor that acts to control knock. Of coarse the controlling function can at times have a negative impact on performance. So the need for high test gas is somewhat dependent on air pressure , temperature , load , humidity and other things. SO far on my GTI 130 using high test gas I have noticed a few things .
1: The boat can now reach 56 and hold there for up to 4 sec. On regular it just hits 55 for a fraction of a second from time to time.
2: Peak rpm has gone up from a typical 7280 rpms to about 7380 rpms
The GTI 130 with its 10.6 cr engine only has 15 hr on it
The next check will see if on a fast start if the revs climb from about 5900 rpm .
My guess is on this boat high test gas is not worth the cost unless the slight gain in performance makes one think that high test would be better for the long term health of the engine ??
But make no mistake , without some ecu control , a 10.6 cr just would not work right on its own on 87 gas.
Up to the 1990es , the highest compression you could have on a engine using 87 gas was around 9.3 to 1 . Also when running high test which in fact would have been considered regular back in the 60es , their was limits.
Higher compression came with the introduction of the ecu and knock sensor that acts to control knock. Of coarse the controlling function can at times have a negative impact on performance. So the need for high test gas is somewhat dependent on air pressure , temperature , load , humidity and other things. SO far on my GTI 130 using high test gas I have noticed a few things .
1: The boat can now reach 56 and hold there for up to 4 sec. On regular it just hits 55 for a fraction of a second from time to time.
2: Peak rpm has gone up from a typical 7280 rpms to about 7380 rpms
The GTI 130 with its 10.6 cr engine only has 15 hr on it
The next check will see if on a fast start if the revs climb from about 5900 rpm .
My guess is on this boat high test gas is not worth the cost unless the slight gain in performance makes one think that high test would be better for the long term health of the engine ??
But make no mistake , without some ecu control , a 10.6 cr just would not work right on its own on 87 gas.
