Quote:
Originally Posted by LiqTenExp
Here is an example in excel from data I exported out of HP Tuners. FYI, I will hit just over 11 kHz on my MAF for some runs, it flattops right after 6900 rpm.
I noted that the calculated Mass Airflow (red curve) tops out around 10.7 kHz @ 655.4 g/s (86.69 lb/min), looks to be related to the SAE PID max value. This occurs around 6200 rpm for me. Dynamic airflow (yellow curve) appears to keep calculating and does not flatline like the MAF SAE value.
See example below, overall I think I'm not being limited harshly by not having a big gulp, maybe around 6700 you can see a little roll off in the shape of the curve:
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I have to go look at some current logs to be sure, but I know I've seen the limit of the MAF PID of , something like 655.35g/s, around 10,100hz (this is a car with only a 2650, 103, and BG), at around 6000 RPMs or so. My Dynamic Airflow tops-out around at my shifts (around 6700-6800 or so) at something like 670-680g/s. I think I'm getting all the lingo right...
I don't believe Dyn-af has a limit like MAF. GMVE-af reaches it's limit even earlier, like 512g/s. I've been using another Math that I think either Higgs Boson, hjturbo, or GHuggins to extrapolate GMVE, and through much of the runs I have, I have all of these matching-up quite well, and the curves are all pretty close, so when the MAF PID flatlines (and the Dyn_af continues), I feel like the Dyn_af should be relatively close. I'm only showing, a lot of the time, a couple percent correction way up there. I'm still trying to clean it up though.
I have logs from before the ported-LT5 TB/ported snout, but the tune was at the very beginning. I was getting A LOT of weirdness. I'm not sure how useful that might be for this comparison. If it seems like it might, I'll update.
And I'm not saying anyone SHOULD get a BG or ANYTHING - I'm just posting what I'm seeing and what I understand of what I'm seeing.
Quote:
Originally Posted by Z OH 6
I feel like 650whp is probably a safe target if you want good traction out of the stock tires. Every amount above that gets really borderline with 700whp really pushing the limits. I can hook when its really hot outside 80F+ and the tires are still somewhat new and warmed up, but temps below that starts to get some wheelspin. I could use a Nitto 555R2 on the back and it would hook more consistently.
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In my experience - I think you're right. We're still on stock tires (with plenty of tread) and even on hot days (warmer than yours even), a 4th Gear pull gets very sketchy and the 4-5-shift will spin the tires pretty hard at around 105 (the logs show near a 10-MPH difference between front and rear tire speeds). I can't imagine a lot of your guys combinations making hundreds more HP on street tires, lol. WHEW!!! I think those 555R2s are on the list for replacing these SC3s.