[3-Serious]

So I finally have my meth kit up and running and was pro tuned. The car feels strong my flow meter says I'm flowing, but my IAT's aren't decreasing like I thought they would? Does that mean my meth Isn't flowing enough?
My very first two logs showed huge drops in my IAT's they would go from 101-75. Then I brought my car back in to the shop where I had my work done because I thought the meth was coming on to late which was why I thought I was having timing pulls. So they readjusted some things and now my timing is fine but my IAT's hardly drop. They will go from like 90-87 and on some runs just stay at 87? Does that sound right? I have about 7 different logs 2 from before they made "adjustments" and the rest were after, with 2 logs being 2nd-3rd gear pulls. Well sorry for the rant I figured 7 logs would be too much to post so if anyone would like to see these logs please let me know. Thank you

[cloud_connected]

pleased post up the logs

[3-Serious]

Look how they progressively get worse run after run?

[Ilma]

What were the ambient temperatures for those pulls?

What mixture of meth to water were you using?

Those two factors alone will impact the temperature drop.

In my case, with a 70-30 mix, my intake temps will generally drop down from 100ish to 77F or so depending on ambients and how heatsoaked my intercooler is.

For an average log, I will see my intake temps drop to within two degrees of ambient during summer.

If you say your timing improved, but your temps went up a bit, that suggests to me that perhaps more water was added to your meth mix.

Using lower than a 60/40 mix of meth/water will make your timing curves look great, but you won't get as much intake cooling with the lower meth content, and you will also lose a bit of power since water does not combust.

So I am wondering if your shop spiked your mixture with some water?

[3-Serious]

Originally Posted by Ilma

What were the ambient temperatures for those pulls?

What mixture of meth to water were you using?

Those two factors alone will impact the temperature drop.

In my case, with a 70-30 mix, my intake temps will generally drop down from 100ish to 77F or so depending on ambients and how heatsoaked my intercooler is.

For an average log, I will see my intake temps drop to within two degrees of ambient during summer.

If you say your timing improved, but your temps went up a bit, that suggests to me that perhaps more water was added to your meth mix.

Using lower than a 60/40 mix of meth/water will make your timing curves look great, but you won't get as much intake cooling with the lower meth content, and you will also lose a bit of power since water does not combust.

So I am wondering if your shop spiked your mixture with some water?

hmm interesting, and its roughly at 60-40meth right now. My next mixture I plan on going for 70-30. The last two runs were on a 78 degree night. I figured that no matter what the temp outside the cars IATs would drop due to the meth. The very first time I logged the car with the meth in it the drop looked awesome and I was expecting to see that every time. Like I said my flow meter reads fine saying I'm flowing and the tank in my trunk is emptying. Maybe I was expecting too much from the meth?

[cloud_connected]

What I think is going on is the way VD auto trims data is misleading you. Try looking at the .csv file itself and see where the IATs are at the start of the pull. If I had to guess I would say they were about/atleast 94F and then you'll see temps drop to ~86F like you see in the graphs.

[Jeff@TopGearSolutions]

It can only drop so much depending on the heat soak and ambient temperature. If you are doing back to back pulls the methanol and your intercooler can only do so much.

Any sub 100 degree intake temps are great by the way. I wouldnt get too caught up on the exact IAT. As long as the IAT is not rising extremely and your ignition timing is good, enjoy the car.

[spool twice]

+1, as long as your IAT's dont rise significantly, the system is doing what it's supposed to be doing.

FWIW, my IAT's only drop below ambient when temperatures are below 85F; anything above that, it's normally within 2-3F above ambient with my stock FMIC

[3-Serious]

Originally Posted by Jeff@topgearsolutions

It can only drop so much depending on the heat soak and ambient temperature. If you are doing back to back pulls the methanol and your intercooler can only do so much.

Any sub 100 degree intake temps are great by the way. I wouldnt get too caught up on the exact IAT. As long as the IAT is not rising extremely and your ignition timing is good, enjoy the car.

Awesome! That's good to hear thanks for the response Jeff. I guess ill just enjoy the car and keep moving forward.

[Longboarder]

Originally Posted by spool twice

+1, as long as your IAT's dont rise significantly, the system is doing what it's supposed to be doing.

+1

I have back to back logs of runs there were done on an airstrip - one the first run I had a problem and meth didn't flow and my IATs shot up from 45c to 90c!!! On the next run meth flowed properly and my IAT's again started at 45c bu this time dropped to just under 40c.

[cstavaru]

It would help if your logs would have axis values. But I don't think there's something wrong. 27 Celsius (83F) is a good meth IAT for an average summer day, not even a hot one. At night you could see 24C, and in the Autumn you can see around 20-19C.

[SIKH335]

Run the car on a hot day without meth aggressively for 10 mins then switch back to a meth map and get on it to where meth should be flowing. That's where you will see the largest drop in IATs from heatsoke. It shoul drop very quickly to the mid 80F and stay in that area as long as meth is flowing.