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Old 05-13-2013, 04:37 PM   #1
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timing and iat

Those with centrifugals what kind of iats are you seeing and what is your total timing at wot?
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Old 05-13-2013, 07:32 PM   #2
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My timing was about 17-19 deg at WOT with IATs at about 115-120.

Pat G, my tuner set it up to pull timing at IATs above about 55 deg C or 135F

Fully built/forged motor though!!!!!!!!!!!!!!

AFRs were very conservative at 10.8-11.0
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Old 05-13-2013, 07:41 PM   #3
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Timing depends on IAT in my tune. On a 65 degree day, I see IAT at the top of 2nd gear at 114 degrees and timing at 14.5 degrees. By the top of 3rd I see IAT at 159 degrees and timing at 11.5 degrees.

I am surprised to see timing pull that much with that temp but I guess that is what is safe. I'm also surprised to see IAT's climb that much, but is still better than the top mounts I've seen. This is with a Vortech Si trim ECS kit, 12 lbs of boost on a stock cammed L99.

What is everyone else seeing for IAT's after a 1/8th or 1/4 mile pull in 60 or 70 degree weather??
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Old 05-13-2013, 08:44 PM   #4
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My iats were getting up to 160 on the dyno and my tuner said it would only accept 8 degrees of timing before knock sensors would pull timing. He acted kinda shocked and asked what octane and where i got the gas from. Royal farms 93.
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Old 05-13-2013, 08:48 PM   #5
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I am at 11.2 AFR running 93 octane 10 percent ethanol. Gauge set for 14.2 stoich. I am down to 11.5 or 12 degrees timing at 160 IAT. 6200 rpms 12 psi boost. No knock retard.
Stock l99 stock cam.

8 degrees seems a little low. Make sure your AFR is no leaner than 11.7 with normal gas calibration and fuel that has ethanol blended.
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Old 05-13-2013, 09:31 PM   #6
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Quote:
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My iats were getting up to 160 on the dyno and my tuner said it would only accept 8 degrees of timing before knock sensors would pull timing. He acted kinda shocked and asked what octane and where i got the gas from. Royal farms 93.

I dont think IAT's should get that high with a centri. Even with my eforce I never see 160.

I am running 94 octane, 10% ethanol, , 12 lbs of boost, 18 degrees of timing, and afr around 11.8 . This is on a forged motor and meth, which can obviously take more timing than a stock engine.
By 158 I am pulling a ton of timing, just in case but I never expect to see those temps.
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Old 05-14-2013, 06:45 AM   #7
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Matt from fsp thinks it could be that their dyno didnt have good enough airflow and that you would never see iats that high on the street. I dont know why im looking for more power the thing just blows the tires off as it is lol
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Old 05-14-2013, 07:33 AM   #8
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With ported heads, 9.5CR, stage II intercooler, and 104 unleaded, I see 160* (at 6800 rpm and 130mph+ at the top of fourth) and 18* timing with no knock-reduction.

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Old 05-14-2013, 07:58 AM   #9
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I see 160 IAT on the street at the top of 3rd after a WOT pull starting from 1/2 way through 1st gear. Not the dyno.
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Old 05-14-2013, 08:02 AM   #10
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With an air to air IC centri, or with a normal intercooler on a top mount, I'm betting there isn't a setup out there that stays below 160 IAT on a 70 or so ambient day.

Everyone I see below 160 is fancy intercooler, AC setup, meth, etc.
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Old 05-14-2013, 08:06 AM   #11
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I dont think IAT's should get that high with a centri. Even with my eforce I never see 160.

I am running 94 octane, 10% ethanol, , 12 lbs of boost, 18 degrees of timing, and afr around 11.8 . This is on a forged motor and meth, which can obviously take more timing than a stock engine.
By 158 I am pulling a ton of timing, just in case but I never expect to see those temps.
Cam and compression have ALOT to do with timing. Meth has ALOT to do with IAT. Turn the meth off and let us know what your IAT and timing is at the end of a 1/4 mile run just before you lift off the go pedal. Ill bet you see well over 160.
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Old 05-14-2013, 08:38 AM   #12
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Quote:
Originally Posted by bct10985 View Post
My iats were getting up to 160 on the dyno and my tuner said it would only accept 8 degrees of timing before knock sensors would pull timing. He acted kinda shocked and asked what octane and where i got the gas from. Royal farms 93.

I would make some changes ASAP. A good cam will allow you to run more timing at the same boost than the stock cam..Especially if you have a L99. Please let us know if we can help with the cam.

Other than that I would go up on the pulley size (less boost) I feel really uncomfortable if I cannot get at least 12-14 degrees of timing in a setup and the reason is this...

Combustion releases energy in a combination of two ways. 1. Expansion work (good) 2. Heat (not so good) The later the timing the more the combustion cycle misses out on expansion work because the majority of the expansion happens relatively soon in the cycle at around 28-35 degrees after top dead center. So what is happening the energy released misses its chance to be expansion work and so is only option is to become heat. This is putting more heat into the exhaust valve, plugs, headers/manifolds, cats, etc!

What I'm getting at is the later the lead, the more your going to start cooking everything else!
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Old 05-14-2013, 09:01 AM   #13
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Cam and compression have ALOT to do with timing. Meth has ALOT to do with IAT. Turn the meth off and let us know what your IAT and timing is at the end of a 1/4 mile run just before you lift off the go pedal. Ill bet you see well over 160.

I had my supercharger without meth for over a year.... saw about 140 at the end of a run. .
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Old 05-14-2013, 09:29 AM   #14
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I would make some changes ASAP. A good cam will allow you to run more timing at the same boost than the stock cam..Especially if you have a L99. Please let us know if we can help with the cam.

Other than that I would go up on the pulley size (less boost) I feel really uncomfortable if I cannot get at least 12-14 degrees of timing in a setup and the reason is this...

Combustion releases energy in a combination of two ways. 1. Expansion work (good) 2. Heat (not so good) The later the timing the more the combustion cycle misses out on expansion work because the majority of the expansion happens relatively soon in the cycle at around 28-35 degrees after top dead center. So what is happening the energy released misses its chance to be expansion work and so is only option is to become heat. This is putting more heat into the exhaust valve, plugs, headers/manifolds, cats, etc!

What I'm getting at is the later the lead, the more your going to start cooking everything else!
Its an ls3
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Old 05-14-2013, 11:31 AM   #15
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I had my supercharger without meth for over a year.... saw about 140 at the end of a run. .
If you were running 12 psi on a top mount blower and no fancy intercooler tricks and no meth then you have an amazing blower to top out at 140 IAT at the end of a 1/4 mile pass. Guys running 7 psi are getting hotter than that on those blowers.
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Old 05-14-2013, 02:08 PM   #16
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If you were running 12 psi on a top mount blower and no fancy intercooler tricks and no meth then you have an amazing blower to top out at 140 IAT at the end of a 1/4 mile pass. Guys running 7 psi are getting hotter than that on those blowers.

Most of my scans are on my laptop but here is an old one. No meth, a hot day in the middle of summer, but only 10-11 psi because belt was slipping.

147 IAT... guess I have an amazing blower....

I am not saying I run so much cooler... I just thought from all the PD blower bashing I see in forum, that centri's ran nice cool IAT's

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Old 05-14-2013, 05:44 PM   #17
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Most of my scans are on my laptop but here is an old one. No meth, a hot day in the middle of summer, but only 10-11 psi because belt was slipping.

147 IAT... guess I have an amazing blower....

I am not saying I run so much cooler... I just thought from all the PD blower bashing I see in forum, that centri's ran nice cool IAT's

Awesome. Was this with the stock cam? If so I guess I should have bought an Edelbrock instead of a Vortech.

Odd that the IAT stayed dead flat at 147. I've never seen that happen. I always see it increase as the pull continues.
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Old 05-14-2013, 08:50 PM   #18
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Awesome. Was this with the stock cam? If so I guess I should have bought an Edelbrock instead of a Vortech.

Odd that the IAT stayed dead flat at 147. I've never seen that happen. I always see it increase as the pull continues.
You are right about it staying the same. It is because the scale on the log was too wide to show the move. Here is another 10.60 run scaled a little better. That was with a stock cam. I have not taken my new setup to the track yet but it has been on the dyno twice... 5 or 6 pulls each time and IAT's maxed at appox 125.

This is not a centri / pd debate. I only commented on the high IAT's of the op because I dont see that high and although I have never owned a cenri, I read constant agruements that they are better because of less heat soak. I think his 160 IAT's are too high and there must be a reason behind it. That is all I was trying to point out.

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Old 05-14-2013, 09:47 PM   #19
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I've never seen over 130 IATs on my centri without meth. That is on 70-80 degree days.
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Old 05-14-2013, 09:59 PM   #20
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I've never seen over 130 IATs on my centri without meth. That is on 70-80 degree days.

That's Unreal !!!

I couldnt resist. Thats more what I would expect from a centri !
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Old 05-15-2013, 07:41 AM   #21
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I've never seen over 130 IATs on my centri without meth. That is on 70-80 degree days.
Same here and high 70's on meth. Driving around town in traffic it's 10 to 15 degrees above ambient temperature.
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Old 05-15-2013, 08:01 AM   #22
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That's Unreal !!!

I couldnt resist. Thats more what I would expect from a centri !
Honestly your car is kind of a freak for PD blowers. A lot of them run 170-200+ when you really get on them. Keeping below 150 is great.
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Old 05-15-2013, 08:08 AM   #23
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Honestly your car is kind of a freak for PD blowers. A lot of them run 170-200+ when you really get on them. Keeping below 150 is great.

I really dont know why it would be. When those logs done was factory eforce setup. Now I have a larger coolant tank but rest stock.
I am convinced a lot of the difference in pd/centri iat's is due to the placement of the sensor. If I moved my sensor into the intake airflow it would be much much lower. I cant prove that, but it only makes sense.
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Old 05-15-2013, 08:25 AM   #24
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Another interesting thing on that log is the coolant temp. I was told not to bother installing my 160 thermostat as the coolant temp would not be lower than with the stock stat orher than when warming up. I see here your coolant temp is 174 after a run. Maybe I should put in my 160 stat.
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Old 05-15-2013, 08:28 AM   #25
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Another interesting thing on that log is the coolant temp. I was told not to bother installing my 160 thermostat as the coolant temp would not be lower than with the stock stat orher than when warming up. I see here your coolant temp is 174 after a run. Maybe I should put in my 160 stat.

My temp depends on few things. That run must have been after sitting for a bit. I run my fans with a switch between runs which allow me to start at laround 160. The fans cool it down very quickly. That first log I posted was probably a hot lap, with no cooldown in between runs.
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