New engine, different set up, is this safe?
Thread Starter
10 Second Club
Joined: Jan 2010
Posts: 2,317
Likes: 20
From: Hurley, VA
New engine, different set up, is this safe? A friend of mine and I have been working on a twin turbo'd C5. The car is suppose to be tuned for 6psi. When we got the car the engine was burning coolant and keeping low oil pressure. Well we were hired to pull the engine, have it rebuilt, reinstall it, and have the car tuned. In the midst of all that we found of all that it had a head cracked (ported 317s). The owner said he wasn't worried about squeezing ever once of power out of it so we used a set of 853s that we had laying around to save him some money. The machine shop says with the pistons, head gaskets, and heads we'll be using we should have close to the same compression ratio as the set up it was tuned for. Well I know absolutely nothing about forced induction so my question is since the car was tuned for the previous set up, and we're going to have a new engine in need of a break in period, will it hurt to start and drive the car for a short time (easily of course) before throwing it on the dyno and ******* it?
FormerVendor
Joined: Dec 2001
Posts: 2,444
Likes: 2
From: WWW.SPEEDINC.COM
Well I know absolutely nothing about forced induction so my question is since the car was tuned for the previous set up, and we're going to have a new engine in need of a break in period, will it hurt to start and drive the car for a short time (easily of course) before throwing it on the dyno and ******* it?
At the very least, scan the car and make sure your fuel trims are within an acceptable range and do not enter positive manifold pressure until it's in the hands of someone that can competently tune it.
