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Another old thread with update was just spotted, and comments made about induction air temps being 150f, and I bet 200 in FLORIDUH summer street driving.....IF the air cleaner is under the hood airflow coming from engine compartment.....
I have a '94 vette LT induction and under hood air cleaner, at one time it was up and over the rad and so in front of the a/c cond......the question is.....
just how much affect is that induction air temp?? would I pick up MPG or smoother operation by going back to the up/over setup?? I know colder air makes for more HP.....question is HOW MUCH???
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
I've never looked into the ECU of the LT so I cannot say for sure, I have tuned some 0411 ECU's (LS ECU) and can say that intake air temps can alter fueling and timing advance pretty drastic
I believe that forum member Paulana did some testing when he developed a really nice air induction set up for C3's that he sells as a side line to his business (really nice too).
Do a search under his name and you might find that running the air induction up over the radiator does add additional hp.
I believe that forum member "pauldana" did some temp, airflow and dyno testing when he developed a really nice air induction set up for C3's that he sells as a side line to his business (really nice too).
Do a search under his name and you might find that running the air induction up over the radiator does add additional hp.
I've never looked into the ECU of the LT so I cannot say for sure, I have tuned some 0411 ECU's (LS ECU) and can say that intake air temps can alter fueling and timing advance pretty drastic
Neal
OK, good to know, my ECU is a speed density system, off like a '89 -91 vette 1227730 computer, aftermarket chip/unit plug in.....done ~15+ years ago.....the induction is LT like '94 vette, the car used to be L98 on top, but switched over long ago.....the heads are still L98 and I have an HEI up top due to a GOOD welder buddy who helped me mod hell outta the intake manifold....L98 roller cam roller rockers, serp drive,....see pix below.....
I believe that forum member "pauldana" did some temp, airflow and dyno testing when he developed a really nice air induction set up for C3's that he sells as a side line to his business (really nice too).
Do a search under his name and you might find that running the air induction up over the radiator does add additional hp.
Well, my question would be what hood mods I would have to do......as I looked at some pix in the other thread, many new notes on it, but the thread dates from like 5 years ago.....too bad I missed out on it, so I started here instead....
I'd say they cooler the better. I can't speak for the older LTs but the LS ecm will definitely retard timing with hot iat's. I know in the summer (95+) I've seen 206 with my gto cai setup and idling for 20 minutes which gets cold air over the top of the radiator. I had no header wrap and cai box wasn't sealed to hood or insulated. It seems c3s don't vent engine bay hot air well either no matter the engine. Start idling abs temp drives down quickly with just the little bit of air movement.
Not sure if this helps you much but i figure the numbers could help.
I'd say they cooler the better. I can't speak for the older LTs but the LS ecm will definitely retard timing with hot iat's. I know in the summer (95+) I've seen 206 with my gto cai setup and idling for 20 minutes which gets cold air over the top of the radiator. I had no header wrap and cai box wasn't sealed to hood or insulated. It seems c3s don't vent engine bay hot air well either no matter the engine. Start idling abs temp drives down quickly with just the little bit of air movement.
Not sure if this helps you much but i figure the numbers could help.
RyAn
I note that in traffic, fan or not, the temp climbs rapidly, and I have a hollowed out hood with a BB insert/topper over it for some 20 years now, and I blocked the back opening near the wiper door because of rain maybe getting on the HEI directly under the opening....guess I should remove that.....oh well, that BB bulge is just for looks anyway, sold the old hood, so can't easy go back now.....
The first image are some temperature readings under the hood of a drive with a drop-base Edelbrock air intake. The intake air to the carb in this case is hot. The second image is some data under similar conditions with an L82-style dual snorkel intake, taking fresh air from above the radiator. I'll have to repeat the experiment someday while measuring RPM, speed, TPS, and inferred engine load (vacuum).
Intake air temps, with DPFI.....
