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Gained roughly 45hp/40tq and hold power pretty well in the higher revs....good street manners. All tuning still done remotely via Autocal... possibly a bit more power on the table, but I'm happy where it's at.
The rpm pickup on the dyno was cutting out a bit at high revs, so I put a run into excel to make for easier viewing and comparo before/after.
Only thing I can think of is it may benefit from a true spark dyno tune? I know it's running 26* at high rpms right now. Aftermarket exhaust might help a little bit too..but I don't think I want it any louder lol.
Good deal. That's about as fun as it gets without idle issues in a c5 with stock shortblock. I think your numbers mirror what my 2002 C5z did with a similar package. No dyno games and conservative tune for roadracing. 450/400 with Vararam, 1 7/8 ARH headers and catless Ti exhaust, older EPS 226/234 113 cam, TEA ported/milled my heads with cut down ls3 valves, Fast 102 and ls2 tb, no pulley and running SD tune. runs 11.80's at 123/124 on a Falken RT615 200tw tire (consistent but crap 1.9 60 foot with bars and normal roadrace spring/shock settings). Also managed 177-179 in the ECTA Willmington Ohio standing mile.
Last edited by briannutter; 01-31-2015 at 01:01 PM.
Been looking around at other dynos with similar mods and I feel like it's right about where it should be..... with these NA mods/motors things are very predictable. Saw one guy who hit 450 with stock ls6 intake still but he also had AFR heads and aftermarket exhaust (maybe another thing or two as well). Ultimately I was going for bang for buck with the AI ported heads (already had the stock 243 heads). Keep longevity and reliability was very important too.... I plan on hitting up some road course track events with this thing (next one is 2 weeks away).
Ever since I did the heads/cam I've been getting the notorious clutch sticking after a few high rev shifts. Put in the Tick master yesterday, got to adjust it today. Hope it fixes my issues, or at least makes it bearable enough for the track day lol! A few months down the road I plan on upgrading the clutch.
to be fair we are talking about going from an ls6 cam and 243 heads with bolt ons and tune to ported heads and a nice mild cam...the final numbers are pretty realistic too
Nice car and numbers! Throw a 102 on there like someone else said if you want to pick up some extra rwhp. I'm going to have the same heads and a mild AI spec'd cam. I met Pat G this past Saturday. I'll be using the autocal too. How do you like it?
to be fair we are talking about going from an ls6 cam and 243 heads with bolt ons and tune to ported heads and a nice mild cam...the final numbers are pretty realistic too
My thoughts as well. I went this route for the HP per dollar value, rather than aftermarket casting etc.
Originally Posted by newchevyman
Nice car and numbers! Throw a 102 on there like someone else said if you want to pick up some extra rwhp. I'm going to have the same heads and a mild AI spec'd cam. I met Pat G this past Saturday. I'll be using the autocal too. How do you like it?
Yeah I have a feeling I will be doing an intake/TB setup at some point. Right now I am more inclined to do the 92 though..... 102 fitment seems spotty on the C5.
AI basically specced me the same sort of cam.... I just went through Patrick since he was already doing my tuning... they basically came to the same results for my needs, so that made me feel confident too.
I've been really happy with the Autocal route. Patrick has been very helpful, quick to answer my question and work my revisions. I am on something like revision 11 right now. You're not always going to be able to work out every last hp since it's not dyno tuning....but for typical/common setups and not super radical builds I didn't see anything wrong with it. A lot of other platforms are huge into etuning. Personally I felt more comfortable going this route than taking it to a local shop (no big name places around here).
I did get a wideband just to help me sleep at night and AFRs were very close, basically spot on for what we were going for...so his tuning techniques are definitely sound.
Autocal itself is nice as you can datalog, monitor params as you please. I always like to take a quick glance at fuel trims after removing the throttle body or air intake or something, to help give me some clues that it may be leaking or something.
Originally Posted by JDMC5
was the car tuned after? There could be quite a few ponies in there if not.
Like I talked about just above... it's a "canned" tune to some extent. Might be able to extract a little more power from timing. AFR is right around 12.5 so I don't see much to be had there. Peak timing is 26* for what it's worth.
You need to excuse some folks around here that live and die by peak dyno numbers. First off your gains look good...you picked 45whp from a mild cam and porting your 243's. Also the power carries nicely. I would say your results are excellent. If you want to squeeze a little more from it, put a ported fast or msd intake on it.
to be fair we are talking about going from an ls6 cam and 243 heads with bolt ons and tune to ported heads and a nice mild cam...the final numbers are pretty realistic too
Exactly, people claiming that this thing is low on power have to realize that we are talking about OEM casting heads here, stock valve size, OEM LS6 intake and a pretty mild cam.
If this had AFRs with matched FAST intake and a monster cam it would make better numbers for sure, but for the setup those are killer numbers especially on a 346.
If afr is 12.5 (measured with a wideband, not just commanded) and the timing is at 26* you are very close. I would say within 5hp or less.
Mine picked up very small amounts of power and ended up at 12.8 and 27.5*
Yep I have an LC-2 hooked up to the kooks x pipe section and have an analog output wired into the EGR pin on the ECU. In the end it turned out I really didnt 'need' it, but I feel better knowing AFR is where it should be.
You need to excuse some folks around here that live and die by peak dyno numbers. First off your gains look good...you picked 45whp from a mild cam and porting your 243's. Also the power carries nicely. I would say your results are excellent. If you want to squeeze a little more from it, put a ported fast or msd intake on it.
I agree 100% for the mods that you have thats great for a 5.7L I have AI 232cc 243 heads on my 6.0L full bolt on and tune put down 469whp and 433TQ. Of course Trick Flow, AFR or any other after market heads are going to make more power but you going to spend more $$$ too. So the power is fine and you have an awesome car that has perfect street manners. Don't worry about it.
My thoughts as well. I went this route for the HP per dollar value, rather than aftermarket casting etc.
Yeah I have a feeling I will be doing an intake/TB setup at some point. Right now I am more inclined to do the 92 though..... 102 fitment seems spotty on the C5.
AI basically specced me the same sort of cam.... I just went through Patrick since he was already doing my tuning... they basically came to the same results for my needs, so that made me feel confident too.
I've been really happy with the Autocal route. Patrick has been very helpful, quick to answer my question and work my revisions. I am on something like revision 11 right now. You're not always going to be able to work out every last hp since it's not dyno tuning....but for typical/common setups and not super radical builds I didn't see anything wrong with it. A lot of other platforms are huge into etuning. Personally I felt more comfortable going this route than taking it to a local shop (no big name places around here).
I did get a wideband just to help me sleep at night and AFRs were very close, basically spot on for what we were going for...so his tuning techniques are definitely sound.
Autocal itself is nice as you can datalog, monitor params as you please. I always like to take a quick glance at fuel trims after removing the throttle body or air intake or something, to help give me some clues that it may be leaking or something.
Like I talked about just above... it's a "canned" tune to some extent. Might be able to extract a little more power from timing. AFR is right around 12.5 so I don't see much to be had there. Peak timing is 26* for what it's worth.
I figured just wasn't positive. There might be a few but nothing drastic, I'd bet less than ten, if any. Pat definitely knows what he's doing. My cam is very similar to yours it's a 228/230 .629" .605" 112+2 spec'd by him. Haven't had a chance to dyno tune mine yet though.
01-31-2015 | 10:08 AM
AI 226cc heads and PatG EPS cam dyno results 
