marc_w Posted October 5, 2004 Report Share Posted October 5, 2004 Me of all people should be starting this... What kind of numbers are you guys seeing through your MAF? I was just looking at some current logs, and trying to reference back to some older ones to see what kind of improvements I've made. Still haven't found any data I can directly compare to. It's a serious PITA for me to get to the track or dyno, so I'm working with what I got. Me... 38.X Of course the stroker and FI guys will have their own numbers... I figured it'd be interesting to compare some bolt-on trucks, cammed trucks, etc. etc. Link to comment Share on other sites More sharing options...
deezel Posted October 5, 2004 Report Share Posted October 5, 2004 I've seen peaks of 40.0 lbs/min twice (one was 39.97). Seen 39.x quite a few times. For a while I played around with trying to tune for maximum MAF reading, as opposed to using the delivered torque reading. Didn't seem to make much difference. Probably because the MAF reading is used to calculate the delivered torque value. Nitrous (wet shot) also has little effect on MAF reading, because the extra oxidizer is being added after the sensor and not measured. Link to comment Share on other sites More sharing options...
AWDGM Posted October 5, 2004 Report Share Posted October 5, 2004 I see 34-35 lb/min pretty consistantly. My 6.0 is stock except for intake, exhaust and Wester's tune. Butch 02 Sierra Denali Link to comment Share on other sites More sharing options...
marc_w Posted October 7, 2004 Author Report Share Posted October 7, 2004 Thanks guys. Yeah, I just scanned a 40.5 last night... haven't had much time to dig through old logs. Link to comment Share on other sites More sharing options...
deezel Posted October 7, 2004 Report Share Posted October 7, 2004 Thanks guys. Yeah, I just scanned a 40.5 last night... haven't had much time to dig through old logs. <{POST_SNAPBACK}> Cold air helps. I'd expect you could squeeze a 41-42 out of your setup... Have you ported the throttle body yet? Link to comment Share on other sites More sharing options...
marc_w Posted October 8, 2004 Author Report Share Posted October 8, 2004 No, no porting. I've REALLY been thinking about it though. Maybe I'll have some time to pull things apart on Monday. I think my exhaust is a bit of a restriction... I can't say for sure, but I know the muffler isn't a 'straight through' design. Link to comment Share on other sites More sharing options...
zippy Posted October 12, 2004 Report Share Posted October 12, 2004 we were messing around with my buddies tahoe tonight and pulling over 400g/s. Link to comment Share on other sites More sharing options...
deezel Posted October 12, 2004 Report Share Posted October 12, 2004 we were messing around with my buddies tahoe tonight and pulling over 400g/s. <{POST_SNAPBACK}> Thats over 54lbs/min! With a Procharger, right? Is that on a 5.3L? Link to comment Share on other sites More sharing options...
zippy Posted October 12, 2004 Report Share Posted October 12, 2004 that's on my buddies 99 tahoe with a P1SC procharger. it has the old school L31 vortec 350 in it. Link to comment Share on other sites More sharing options...
SSminneapolis Posted October 17, 2004 Report Share Posted October 17, 2004 MAF highest value...37.55 from a 0 to 130mph run... Link to comment Share on other sites More sharing options...
vdrumright Posted February 6, 2005 Report Share Posted February 6, 2005 I don't know squat about tuning. I just logg data and email it to the tuning professionals...lol After reading this post I look at a log i made this morning and have a MAF 62.31 lb/min peak reading. I don't have a clue what this means but heres mine..... Link to comment Share on other sites More sharing options...
mcwarren Posted February 8, 2005 Report Share Posted February 8, 2005 Whar elevation are you guys at? Elevation: 6500' Temp: 50 f RPM 5192 Boost 7.6 psi MAF: 330 gm/sec 43.5 lb/m For those that have a dyno run, what kind of correlation are you seeing between MAF gm/sec and RWHP? Michael Link to comment Share on other sites More sharing options...
marc_w Posted February 10, 2005 Author Report Share Posted February 10, 2005 I'm around ~600' or so. Temps - usually below freezing. I've been logging high's of 42lb/min through my stock intake system and paper filter... Link to comment Share on other sites More sharing options...
H2Racer Posted March 21, 2005 Report Share Posted March 21, 2005 We did a couple runs on my H2 yesterday and got the AFR tuned into the 11.2 AFR range throghout 1st and 2nd gears. As we did we found that the truck seems to like 11.2 more than 11.5 and it's sucking in a pretty good quantity of air. At the top of 1st (6000 rpm) it's pulling 58.94 lbs/min (446.59 gms/s) and the top of second (5700 rpm) was pulling 56.64 lb/min (430.71 gms/s). We've adjusted the programming to shift 50 rpm earlier on the 1-2 and 100 rpm later on the 2-3. I'll lose some flow on the 1st gear but will gain on the second gear MAF flow. Factory springs are kinda scary even when they only have 4000 miles on them. Now I'm waiting on the 2.9 pulley so I can do the final tune and leave things alone. Link to comment Share on other sites More sharing options...
BigTex Posted March 23, 2005 Report Share Posted March 23, 2005 In late 2003 when I was modding my truck for N/A use, I often saw peaks of 47 pounds MAF flow. Now with my Radix and cold weather, I've maxed out the MAF table by 4800 rpms. After reading this post I look at a log i made this morning and have a MAF 62.31 lb/min peak reading. I find that hard to believe. The stock PCM/MAF only reads flow up to 59.9 lb/min or 454 grams/sec. MAF: 330 gm/sec 43.5 lb/m For those that have a dyno run, what kind of correlation are you seeing between MAF gm/sec and RWHP? Wow, that elevation must really be keeping your power down. I'd be expecting more MAF flow than that. A typical estimate is 10 flywheel HP per pound of MAF flow. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.