Ping, IAT's and engine comparment ventnig

Ping, IAT's and engine comparment ventnig

Postby Hank [OP] » July 16th 2009, 3:08am

Anybody have tips for getting some more airflow under the hood?

I'm working on my summer tune and have a problem with ping and IAT's in the late afternoon summer heat.

I have my spark tables sorted out and the ping is almost gone. The real issue is the IAT's as the ECM starts pulling timing at 125F. Which is really easy to hit in the FL summer. I've modified the IAT table and it is pulling timing a bit more aggressive than the factory settings so that solved my IAT ping related problem.

Is there any way to get some more air moving under the hood? I was pondering some electric fans and possibly tilting the hood or punching louvers in it. Think old Cal look VW.

Thanks in advance.
Camaro eating, trailer dragging 2003 AWD tuned with hptuners.
See http://www.hptuners.com
http://www.hptuners.com/forum/showthread.php?t=11225
Balancing by http://www.innovativebalancing.com
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Re: Ping, IAT's and engine comparment ventnig

Postby astro355 » July 16th 2009, 5:05am

What octane fuel do you use?

Electric cooling fans for the radiator will also help cool off the engine compartment. I run dual electric fans from my 3rd gen Firebird and they work fine. Louvers in the hood might only work if the air has a chance to come straight in and your doing consist speeds. If you're talking about stop and go traffic, playing with the hood won't do much for you.
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Re: Ping, IAT's and engine comparment ventnig

Postby Hank [OP] » October 28th 2009, 7:39pm

I'm back from a real long hiatus and wanted to update on this.


Ping turned out to be a dirty MAF. I've fired my mechanic and starting working on my own cars again. Was busy with work and thought I'd save some time.

The dirty MAF caused the motor to run lean. I saw this happening in hptuners.

I cleaned the MAF and then had to recalibrate my fuel trims and MAF tables.

No more ping on my low or high octane tunes.
Camaro eating, trailer dragging 2003 AWD tuned with hptuners.
See http://www.hptuners.com
http://www.hptuners.com/forum/showthread.php?t=11225
Balancing by http://www.innovativebalancing.com
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Re: Ping, IAT's and engine comparment ventnig

Postby Mr_Bowtie » October 28th 2009, 11:36pm

Got anymore info on your Van? Still using the 4.3 motor with what mods? I'm just curious what you have done to you motor and how much faster it is?
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Re: Ping, IAT's and engine comparment ventnig

Postby Hank [OP] » October 29th 2009, 2:39am

The van is still running the factory v6 with no other mods than an opened airbox.

Everything else was done with hptuners. Here is a partial list.

Modified spark table.
MAF calibrated and LTFT, long term fuel trims are stable between 0 and -7. Just slightly rich for safety. Factory acceptable is +10 lean to -10.
Shift points modified on both normal and tow haul modes.
TC lockup is solid. 0 slip.. No, the factory does not do a 100% lockup.
Trans pressures upped from 90 to 93, max allowed is 96.
TC lock enabled during shifts.
Abuse mode disabled.
Spark retard on shifting disabled. Yes, they all pull timing at shift..
Shift firmness increased
Shift speed increased.
A/C set to disable 80% throttle.
Power enrich now enabled at 80% throttle.
Knock retard curve reduced, pulls timing slower, pulls less timing and recovers faster. Factory is several seconds.

It is tough and complicated to explain most all these settings are on curves so I have is set nice and calm when below about 30% throttle but past that she comes to life quick and hard.


Right now I have the 2" lift from Overland, which I love, and some factory size BFG AT's. I feel the extra height when towing and am going to pull the lift. The BFG's are soft and have reduced mpg by 1 and are a bit slushy feeling, really feel it when towing. Since this is now my tow rig I am going to pull the lift and tires and going to get some good street tires. Maybe rims and tires..

All 4 corners have the good old fashioned white KYB gas adjusts and the big hellwig sway bar on the rear.

Without the lift and BFG's I could keep up with V8 camaros and totally smoke V6 ones. Even more funny would be to smoke some rice maker with the three pink car seats in the van. All empty of course.

Towing factory tune and factory tires I got 8 mpg. Now even with the BFG's I get between 10 and 11. I can also run 70+ easy on the highway with the trailer behind me. Before I maxed out at about 62.

I am seriously considering headers, intake, tbi stuff from CFM, new cat and exhaust.

I will gladly share my tunes with anyone should they buy hptuners. It is not cheap but it really is the best bang for the buck.
Camaro eating, trailer dragging 2003 AWD tuned with hptuners.
See http://www.hptuners.com
http://www.hptuners.com/forum/showthread.php?t=11225
Balancing by http://www.innovativebalancing.com
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