Quote:
Originally Posted by 1795
As I think about it, this combination might work out well for you and have some added benefit. The 4.88 rear end will allow for quicker acceleration out of corners, with the cost of lowering top speed for each gear on the straights, but being able to approach 9,000 rpms will make up for that and decrease the need for an upshift at the end of longer straights.
The combination of the 4.88 rear end and 15:1 compression ratio will probably result in quicker de-acceleration when you take your foot off the gas and this may result in you being able to take corners with just a light lift that previously required some braking. A quick lift and turn in may be all you need, or at least you might only need lighter braking than previously. Anytime that you can eliminate some form of driver input, such as shifting or braking, you will lower your time.
Looking forward to hearing how things work out once you get it all back together.
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Funny you should bring the "light lift" up, that is how the car is set up. I like the way my GT3 Porsche handles IE don't brake just lift so we set the Cobra up to handle the same way. A light lift transfers enough weight for turn in then throttle application makes the car go neutral. It works really well at the autox's we run.
The car will have close to the same top speed in each gear as it did with the 4.27 rear end the difference being that it will have a higher minimum rpm and keep port velocity in a working range. All small changes but hopefully worth about 1 second on a 60 second course.