Quote:
Originally Posted by Eldi Z
Yes, real world situations are different to Dyno pulls clearly. On the other hand, so many tuners stand with their custromers, after installing / tuning supercharged spplications on their LT1s.
They walk them through and usually customers come back for addtioonal upgrades from time-to-time, so they can follow up in time.
Lets hear these Real-World scenarios from professionals who tuned and tune these LT1s daily on all fuels and boost combinations possible, like Ted J @ JRE, Andy M @ ADM, Mike C @ Elite (Vengeance), Howard T @ Redline, Jeremy @ PPC, Pat G@ Guerra, Ricky Clarke, Justin White, Jeremy F @Fasterproms, Doug @ ECS and so many others....
Ask yourself, would all of them + all the aftermarket kit makers: Edelbrock, Magnuson, Whipple, ATI, Vortec not go out of business if so many of their LT1 engine'd custmers would break them on 93 pump gas?... I did not even mention the Californian crowd who use 91 pump on these platforms.
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They are living because they don't make the power real world that they made on the dyno. All of those cars that made 550-570whp on 93 are cold pull perfect conditions and 480-520whp real world out on the road. You referenced stock ZL1 power, again the SS with 7-8psi makes ZL1 power under very limited conditions on pump gas. GM lowered the compression on the LT4 for a reason. And even the LT4's are octane limited on 93 with any increase in boost. I am not saying it can be done; I am saying that the claimed power numbers you can make are reliably exaggerated.
Here is an example. My friend bought a SS from a member(Jfmoore) that had a P1x LT4 fuel system remote tune by shop name mentioned here. I checked the tune after he bought it and had 2-3 degrees of KR and wouldn't make the 4-5 shift clean. On 9psi peak it would only tolerate 10-11 degrees without KR mid summer 90 degrees out. The knock took its toll, It now has a forged bottom end. I see big name shop stuff all the time. A lot of cars get sold off not long after modding and you don't hear about the problems that may have developed. I could keep going but I am not out here to ruin names. The shops mentioned do good work, the problem with remote tuning is that you do not have control over the environment. The data is only as good as what the end user gives you. Hence why I don't tune SBE 93 octane boosted stuff remotely. The tuning window is razor thin.
Side note: far as ring gaps. The LT1 can range anywhere from .008 to .012. The LT4's are around .022-.024.