Okay members. Here is my plan. Im going to install My ported HSR (still in progress), 1.6 full roller rockers, AFR 1040 heads, and Edelbrock 68723 headers. With that said, Im looking to install a LT4 HotCam. Will the LT4 Hot Cam be ok to run on my Mass Airflow System? Ive searched but have not found any credible info on the combination of MAF and LT4 Hot Cam.

Here are the lift specs with the rocker and cam combination:

1.5 Rockers + cam = .492 lift
1.6 Rockers + cam = .525 lift

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It'll be a whole lot better than a MAP. As far as putting it together and firing it up with out tuning.
Until you tune it keep the stock injs and drive it like a normal car. When ready to tune put your bigger injs in it and then you can rip on it when tuning is done.

There are better cams out there but the hot cam will work ok since its fairly mild.

 

Sweet. So then my 21 Lb Bosch III's won't be enough as well as the 350 Hypertech ThermalMaster Memcal (127062) that I'm running correct?

 

Most of the maf cars i tuned ran well on basically stock settings as far as idle and part throttle goes. Beyond that its hit or miss. I had a 330 whp big cam afr headed L98 take a stock arap bin and be pig rich at wot. My hot 383 was dead lean with a aujl bin, requiring 80% fuel added to pe vs rpm.

Some similar 383-406 motors didnt run on my aujl bin. So go figure, can be hit or miss.

Lt4 hotcam isnt the best cam in a afr head motor but it will make good hp numbers. Good bang for buck

You will need 24lb inj atleast maybe even 30's for room. Stock chip should be tuned for best results.

 

Orr's advice is pretty well spot on. Yeah, that's the beauty of the MAF systems, in that they'll run pretty good even with the stock tune with a larger cam, heads, etc. As Orr suggested, 24 pound injectors would be a good idea eventually. I'm running a 355 with the Super Ram intake and AFR 190 heads, and the Comp 502 cam, and honestly it ran pretty decent with the stock 89 chip. Only problem I had was I had already installed 24 pound SVO injectors, so it was pig rich at idle, but I'm pretty sure it would've ran about normal if I would've had 22 pounders in there. But yeah, you should be ok with the stock tune for the moment, but down the road, get a custom tune that's set up for 24 pounders. I'm no good at chip tuning so I had PCM 4 Less burn a chip for mine. I gave them all my specs and had them use the ARAP bin file as the base tune. It worked out really well. One thing though, if you have them use the ARAP bin, make sure they use the stock Camaro torque converter lock-up settings if you're running a 700r4. My tuner left the Vette lock-up settings on the bin, and it gave me fits until I had them changed to the Camaro ones! So whatever lock-up settings you have on your original chip, make sure they use them on the new chip. The ARAP bin works well though, since it's intended for a 350 TPI w/aluminum heads.

 

 

Arap loves afr 190's since those heads are very close to L98 113 castings. Like the high timing. May work well for other brands castings and afr non eliminator 195-210's. New eliminator afr heads will not like the arap aggressive timing. Same with other efficient chamber or fast burn chamber type heads

 

Hey, that's good to know Orr! I didn't realize the newer eliminator series were that much different from the old 190's.

 

Few cars i tuned, or those who have tried my bin as a base file have typically seen newer eliminators at 32-34 deg max timing depending on compression ratio and plug heat range. My 383 i track tested and dyno tuned from 34 to 39 deg. Didnt seem to care when looking at peak hp but at peak torque it loved 34 deg and may have wanted 32. Last afr 190 head i track tuned ran best at 38 deg at wot. Had arap timing 41-42 deg in cruise areas. My afr eliminators didnt like more than 35-36 deg at some cruise spots, started getting spark retard from knock sensor. Again the combination will vary depending on parts but head chamber burn characteristics and a well matched induction package will call for different timing.

My new rhs based heads are taking tons more timing, 10-12 deg more in some spots on my turbo car vs afr 195 eliminators. Only thing different is cam and heads, same everything else. Cam and head package are dictating different ignition timing

 

So then my 195 AFR 1040 will not like the ARAP?

 

The base arap table, i would say its alittle aggressive. I would modify that portion from stock, else set base timing 2-4 deg retarded from stock 6 deg setting as a trial. Work your way up as required

You can have tuned performance make a base bin to see how car reacts. Use arap as base but with a relaxed timing table. Raise idle speed to 750-800. Make idle spark loads between 600-1000 rpm or so and lv8's of 48-80 all the same value. Id try 26-28 deg overall. Raise max airflow values per rpm for maf so it can read higher values as you will likely max maf out early in the rpm range, and those values need to be raised. Disable egr, correct the fan switch from vette to fbody in bin, and try that for now

 

Cool. Thanks Orr89RocZ. Ima bring in Tuned Performance so that he can help me with the bin modification.

 

I will loan you a cable when the time comes so you can do some data logging. ill put it on your tab

 

I basically use one of 2 maf bins as a base for any car i am tuning. My 383 based aujl without the extra fueling that i added since when first starting on a new combo i take it slow and slowly get into wot to see what it wants. That aujl has a smoothed out conservative timing table. Other bin is arap with same changes as my aujl except timing is still left aggressive for known heads that want timing. If you dont know what heads may like i put the aujl timing into the arap bin

 

I got the cable I made bro. I'll data log soon. I gotta buy a new laptop battery.
So it's possible to copy the spark tables from one bin and paste it into another?

 

Use tunerpro not that crud winaldl, you need to test out your burner , just a copy and paste you can even start with aujm timing I'm sure it would be close to aujl.

 

You can mix and match whatever data you want. Some guys copy the arap maf tables into other bins and thats it. Anything 6e based can be used in other 6e's. i havent seen much need to mix and match much else however. Mainly need to get timing and fueling roughly approximated and get engine running asap and tune from there.

Trouble occurs once you start getting into heavy throttle and max out the maf. Once you do that only way to add fuel is pe mode vs rpm. Effective but you have no idea how much needs added until you log it and get o2 sensor data. Milivolts from narrowband can approximate air fuel ratio but wideband is really needed. Pe mode enrichment tends to follow torque curve so if you have an idea where peak trq rpm is and peak hp, you know where to add fuel, where the fuel curve dip will be and where it starts to rise again from peak hp demand

 

ASAP I haven't used that .bin

 

Lol thats a secret bin. Quick and easy

 

It must be one of the Aussie self tuning bins from the 808

 

I already tried it last year with TunerPro. Didn't work. It only worked with Winaldl.

 

I usually set my base timing at 12 degrees advance. That seems to work really well. I think I could probably add even more timing with no ill affects, but it does work good at 12. Altitude may be a factor as well, I'm at about 5000 ft. above sea level here. Btw, the bin file I got my converter lockup settings from to use with the ARAP bin were from the ANYJ bin. As Orr said, good call on the fan settings too. They're probably quite different on the Vettes. As far as that goes on my car, I'm using the Hayden 3647 adjustable fan control and the Taurus 3.8, single 10 blade fan, so the PROM has nothing to do with my fan control any more. The adjustable setup is great! I can switch from summer to winter fan settings with a simple turn of a screw on the fan control. But yeah, if the ARAP bin is too aggressive to use with Eliminator heads, you might be better off starting out with an 89 F-body, 5.7 bin file, and go from there. That's the nice thing about TunerPro, you can tweak whatever you want, and starting with an F-body bin might be the best way to go. As I said above, I never realized there was that much of a difference in spark timing between the old 190's and the Eliminators.

 

 

94+ LT1/4 Cars are factory MAF cars so I'd venture to guess GM had that in mind when they designed the hot cam.