Yep, makes perfect sense. Some trucks were worse than others. I have mine adjusted to shift at 5800rpm through all gears, no noise. However, my truck has zero lifter noise.
Detonation or lifter noise?
Recently purchased a Diablo Intune 1000 and downloaded the 91 octane tune. I also adjusted the rev limiter and shift points to 500 rpm higher than stock through the first 3 gears. I always run premium 91 octane fuel through a brand name fuel supplier and my 07 Escalade only has 45k miles. Problem im having is at the high end of first and second gear theres a noise coming from the engine. Sounded like detonation to me but when I called Diablo they said the computer would pull timing back long before I ever heard it. They also said these 6.2L engines are known for lifter noise and that's what Im hearing just before each shift. I found it strange that such a refined engine as the 6.2 would not be able to handle an extra 500 rpms. Has anyone else had this problem and does anything that Diablo said make sense?
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Lifter noise is going to be more prominent at lower RPMs. At higher RPMs they should be sufficiently pumped up with the higher oil pressures. I would be wary of higher RPM lifter noise as you would hear more exhaust as the RPMs increase. If its loud when revving higher then you may have other more serious issues. You could wind up spinning a lifter and destroying a cam in a matter of minutes if you have issues. Does the noise increase/stay same/decrease while under load?
The noise is definitely only at high rpm, just before each shift. It also only is heard with the rev limited increased. If you run it without the tune and at the stock shift point, it will shift all day long without ever making a sound.
I would just stick with the stock tune then unless you look forward to some repairs.The noise is definitely only at high rpm, just before each shift. It also only is heard with the rev limited increased. If you run it without the tune and at the stock shift point, it will shift all day long without ever making a sound.
No I think this is good that he has found a problem. Tune or not, there should not be any noises coming from the engine. This is your golden ticket to find and repair the problem before it just simply destroys the engine. Not many people get the opportunity to dodge a bullet!
Keep in mind 07 & 08 have smaller injectors not intended for that tune. 09-14 can accommodate a different threshold as the injectors are sized to flow higher volume when e85 is run.
The cool thing is, unlike other GM vehicles in 07 & 08 with the L92 6.2L, the Escalade was tuned to 403 hp. The 07/08 Denali & (08)Tahoe were only 380.
07/08 run a different design of fuel pump, injectors and rail. GM jumped on the bandwagon to get EPA fuel credits from in 09. They quickly slapped on the needed parts but the fuel system plumbing was already e85 compatible in 07/08.
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The cool thing is, unlike other GM vehicles in 07 & 08 with the L92 6.2L, the Escalade was tuned to 403 hp. The 07/08 Denali & (08)Tahoe were only 380.
07/08 run a different design of fuel pump, injectors and rail. GM jumped on the bandwagon to get EPA fuel credits from in 09. They quickly slapped on the needed parts but the fuel system plumbing was already e85 compatible in 07/08.
Sent from my iPhone using Tapatalk Pro
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