Trans Problem???

[MNwe4]

Ok, at the track currently and trying to decide if I want to run tomorrow considering I do have to drive it home 130 miles. Basically the 1-2 shift is not a crisp peak like I thought it would be and used to be around 21 psi. The attached runs were at 24 psi. Maybe the trans it going away? Powerlogger reads slightly lower than gauges on boost and afr.

Also noticed a lot of knock if using overdrive and after the 3-4 shift didn't gain any rpm. From what I understand, OD loads the engine a lot more and causes cylinder pressure to increase quite a bit. Is that a simple explanation of what's going on?

Thanks, Dave

 

[bison]

Youre driving over the converter

 

[MNwe4]

Ok, that's one of the answers I was sort of expecting :biggrin:

How about the issue with knock only when using overdrive? It was repeatable and happened earlier on in the next run, so I quit using it the rest of the weekend.

 

[GNTtypeKid]

Youre driving over the converter

What does this mean? Thanks.

 

[bison]

Ok, that's one of the answers I was sort of expecting :biggrin:

How about the issue with knock only when using overdrive? It was repeatable and happened earlier on in the next run, so I quit using it the rest of the weekend.

Its hard to say for sure but id increase the alky and or octane to see if it goes away. There is a lot of load on the engine and detonation will happen a lot easier in OD.