[JSH]

Originally Posted by Katech_Mike

Fender tank would be a good start. I like the Synergy unit.

Trunk tank with EMP would be the best but not everyone wants to go that route.

Here's shots of my Rhodes 7 1/2 gal. tank with internal pump, which leaves you full access to your trunk. Not that I use it much. From start to finish it would be hard for one guy to complete this in one day. Figure two.

[toohighpsi]

Originally Posted by MartinLe

I have had a number of fellas, including my tuner, tell me that 138 is not high - in that it is not pulling any appreciable timing. At 7K I'm getting 28* of timing and she is running like a scalded dog. When the MATs do get high, timing is pulled and the motor is happy. In my limited experience, I can't see a way to keep the MATs lower than 130*- give or take - without aftermarket cooling.

Did you check that it's still full of coolant? Those temperatures are way too high for a Maggie 2650 even with stock cooling.

Did you verify that you are logging the correct Manifold Air Temp? There are 2 of them, log them both with key on and disconnect the MAT sensor. The correct one will go to -40 when disconnected. The other one is a calculated value that is normally never very close when the vehicle is modified. I'll post a pull from my Z06 that just happens to be running the same pulley combination that you are.

[toohighpsi]

Here is the start of the pull from a cruise with IAT of 79F and a MAT of 120F



Then here is the end of the pull. It's a reasonable boost level (just touching 20 psi at 6500 before the granny shift to 4th), ending the pull with an IAT of 79 and a MAT 100F.
If your system is full of water and circulating I'm thinking you're logging the wrong MAT.



Let us know what you find...

[JSH]

Originally Posted by toohighpsi

Here is the start of the pull from a cruise with IAT of 79F and a MAT of 120F

Attachment 1109033

Then here is the end of the pull. It's a reasonable boost level (just touching 20 psi at 6500 before the granny shift to 4th), ending the pull with an IAT of 79 and a MAT 100F.
If your system is full of water and circulating I'm thinking you're logging the wrong MAT.

Attachment 1109034

Let us know what you find...

I think I'm seeing it like MartinLe does. My MAT cruises around in the 90s and goes up to 110-120 at peak RPM. This is with a 7.5 gal. Rhodes tank, but I won't swear that this data is actually MAT. It's not IAT temp 1 or 2.

[MartinLe]

Originally Posted by toohighpsi

Did you check that it's still full of coolant? Those temperatures are way too high for a Maggie 2650 even with stock cooling.

Did you verify that you are logging the correct Manifold Air Temp? There are 2 of them, log them both with key on and disconnect the MAT sensor. The correct one will go to -40 when disconnected. The other one is a calculated value that is normally never very close when the vehicle is modified. I'll post a pull from my Z06 that just happens to be running the same pulley combination that you are.

I think I must be logging the wrong MAT. But, on the other hand, the Banks reading is the same as Jannetty's in HP Tuners. I have bleed the SC multiple times and no coolant has been taken in. On the way to work this morning, I was registering 55* IAT and 100* to 118* MAT. I am at a loss, here. I will check that I'm logging the correct PID. The lowest MAT I've ever seen was 138* at the end of a pull at about 70* ambient. Thank you much for your help.

[toohighpsi]

No problem, it's an easy check and disconnecting is the only way I've found to make sure I'm logging the right one. That other MAT is a calculation based off conditions of the stock blower to be used as a reference in case the actual MAT sensor fails. As long as the MAT sensor is working the calculation is not used.

[JSH]

Originally Posted by MartinLe

The lowest MAT I've ever seen was 138* at the end of a pull at about 70* ambient.

That's about what mine hit this morning after a bunch of hits. It pulled less than one degree for a MS at peak MAT with no ice in the tank. I'll repeat tomorrow with ice.

[JSH]

Loaded a bag of ice, did the usual routine and warmed it up, and at 7,000rpm:

coolant temp 178
boost 17
MAT 135
IAT Advance -0.3
Advance 19.8
10 seconds later - MAT - 110F
20 seconds later - MAT - 95F at 75mph

[MartinLe]

Nice numbers. I wonder? It pulled .3 spark, not much. Not a difference for us not looking for .001's. Are our cars faster with MAT's of 90* opposed to MAT's of 140*? As long as no timing is being pulled, or a tenth here and there, does it make a difference?

[KingLT1]

Originally Posted by MartinLe

Nice numbers. I wonder? It pulled .3 spark, not much. Not a difference for us not looking for .001's. Are our cars faster with MAT's of 90* opposed to MAT's of 140*? As long as no timing is being pulled, or a tenth here and there, does it make a difference?

Not as much of a difference on E vs gas. Ethanol is chemical intercooling on its own...drastically lowers EGT's.

[JSH]

Originally Posted by KingLT1

Not as much of a difference on E vs gas. Ethanol is chemical intercooling on its own...drastically lowers EGT's.

I'm on the verge of going to E, but I need to order a BBFP which has an eight-week delivery