Upon my first trip to the track with the new motor and h/c setup, I discovered less than expected results with some interesting scans. On the below screen shots, notice the inconsistent boost levels which have a very random pattern after first gear.







I also noticed that the intercooler system is being pressurized and evacuating via the reservoir cap. I am thinking it could be a leak at the intercooler connection where the IC exits the upper manifold. However, with a boost leak, why would it have increased boost in the upper rpm?

Sometime this week I will be pulling the compressor and manifold to inspect and pressure test the IC.

 

What motor is this on? And what does the motor have done to it? Also what model blower?

On a side note your IAT's are really high!

 

371ci 6.0L iron block, stock crank, Wiseco -11cc pistons, K1 6.125 rods, TEA/TFS 245cc heads, 225/243 .621/.627 117+6 cam, 7.450 x 3/8" pushrods, stock rockers with trunion upgrade, Kenne Bell 2.8L pullied @ 2.35:1

Yea, I know.

 

what fuel are you running?

 

93oct E10 pump gas.

 

I hope you are injecting alcohol after the IAT sensor. Those temps are high if you are not. Also the timing would be high if you were on gas. When my 5.3 blew I was running timing almost that high with lower IAT's than that. You might be lifting a head.

 

The change in boost could very well be due to that small of a pulley and the belt slipping.

 

I ran that much timing and up to 24* in cool weather with the previous setup with even higher reported IATs for over 6 years. There is lots of discussion about the placement of the IAT sensor providing false readings on the KB setups like mine. I actually have the knock sensors set more aggressive and as you can see there is no sign of KR except for the very end of the third run as I let out. That is likely my pass side header banging the frame as the engine rocks back on decel.

Previous setup had same pulley configuration (3.5" SC/8.25" Crank 8-rib) with no belt slip and rock solid 14.5-15psi across the board. There are no signs of belt slip, I have been down that road before and this looks nothing like that.

Also never lifted a head with previous 241 heads, head studs, 5 layer MLS gaskets and a heat range hotter plug. I find it hard to believe the thicker TFS heads with 7 layer gaskets are lifting, however that is something I will look for when I start the inspection. The only way I see lifting a head would cause a rise in manifold pressure is if there was cross cylinder pressure bleed leaking from one cylinder in compression/combustion to another on the intake stroke. I did not notice any signs of puking engine coolant while at the track; just intercooler coolant.

 

I thought you were running a much smaller pulley on the supercharger than that for some reason.

I am not familiar with those superchargers, could your bypass valve be leaking?

 

Do you have an air filter on the intake?