OK guys, i am very much aware of "all dyno's are different" and that we "take the numbers with a grain of salt" and "dynos are for tuning" blah, blah, blah...... well yesterday left me a bit perplexed...... on saturday 11/17 the local FLXC guys get together with a local viper tuner and have a m&g / dyno day bbq. fun times last year when we did it, so lets do it again..... luis (ltdodge) is the first car to run..... he has 06chsrt8 with cai, cat-back,180 t-stat,predator w/93 octane tune....... he comes off at 369rwhp..... this strikes me as a hair low for the mods, but ok, maybe the dyno is loaded differently, or calibrated differently than last year. keep in mind, SAME DYNO, SAME OPERATOR, SAME ATMOSPHERIC CONDITIONS (humidity was slightly less)...... i am the third car..... first run.....391....second 400......third 404!!!! WTF i say!!! then the operators realizes that the readings are from speed, not rpm......corrected the number read 363rwhp......wtf???? i did 378rwhp the last time on the very same dyno, under very similar conditions and this year i even added hi-flo cats!!!! anyway, i am thinking that obviously things are set different on the dyno and my numbers did seem to compare correctly to luis 369rwhp considering our mods. (i do not have pred)....... here is when things got strange......... up comes a maggie with a stroked out 5.7.....419cubes now....... tons of mods, etc, etc....... lays down 400rwhp......now all of us are kinda looking at each other. still seems reasonable when comparing the number though...... but then the 5.7's begin to take their turns and things began to not make sense.... dead stock plum daytona 300rwhp sublime with cat back/cai - 298rwhp r/t w/rt staight pipes/cai - 303rwhp........ this is what seemed strange. i have seen these cars run before and they ran almost identical numbers last year, so my theory that the load on the dyno was changed kinda did not makes sense anymore. also, at the very end, another srt rolled on with IDENTICAL mods to luis and turned a 385rwhp. funny thing, we pulled the fuse on this car after two runs and the car went from 385rwhp down to 374rwhp!!!!! wtf!!! i had just pulled my fuse the night before to "liven" up the car, but could i have done myself in by doing so?????? anyone ever experience this????? seemed as if the early cars on the dyno ran lower numbers and the later in the day it got, the better the numbers got. can dyno's "warm up" or "break in"????? anyway, sorry for the loooooooong post, but it just seemed a bit strange to me to witness two srt8's with identical mods run 16rwhp difference and to top it with seeing my own car, on the same dyno, same weather, do 15hp less even after the hi-flo cats were added?????? then to see more heavily modded cars do lower numbers than previously recorded while closer to stock cars run identical numbers, if not slightly better???? could the fuse pull kill that much????? any thoughts guys????? lease:
Chris, First off, Dyno's should be for TUNING purposes ONLY! There are too many variables to give yourself any concerns... What I noticed on Luis's Dyno sheet was the SAE Correction number, "5". I think that is where the issue may be. I am not a guru of Dyno's by any means, but the 5 may be giving a flase correction, which would explain the very low numbers...
lol If you would go to places OTHER than the Lounge, you would actually see lots of neat threads. lol http://www.srtconnection.com/forums/showthread.php?t=410
Chris.Keep in mind the heat soak.If one car is running on the dyno at say 200-205 degrees and the other is at 175-180 degrees there will be some hp loss.i have seen as much as 20hp loss on a dyno when heat soak kicks in..Just my 0.2
Chris my friend....you said it yourself..."take the numbers with a grain of salt" and "dynos are for tuning" blah, blah, blah"..........you crazy Floridian...dynos are for tuning........tracks are for bragging...:bottom:
Dynos are friggin voodoo, IMO. I've witnessed some pretty strange results, too. I've gotten results, with the same mods, yielding 20+hp difference. (Your numbers look about right to me, though, FWIW.) SAE correction of 5 is quite common. I doubt that's the issue. I've seen a stock SRT8 clock over 400hp, too. Depressing! It's so tempting to try and compare our rides by looking at printouts from a dyno day. Just get everyone to the track on the same day, like Bazooka said. There's yer numbers!! :thumb3:
I agree "take it to the track" but as long as we're just talking here.... Since the 5.7's were getting numbers in line with their previous runs on the same machine that almost rules out the dyno being off. Man Chris, those numbers do seem low, a 419 cid only putting down 400hp. I hope it runs fast at the track. Not that it's unusual for a new motor to run like crap before it's dialed in but I'd be a little "disgruntled" with a 400hp dyno. My dyno at GSM yesterway was 398/398 with CAI and tweaked 91 CAI tune. Racer-X's magnum with the same mod's put down very close to the same number (394 hp/406 tq). I think these numbers support the fact that the "average" stock 6.1 car has 375-380 rwhp. How was your a/f? Maybe the new cats don't play well with your b&g? http://i226.photobucket.com/albums/dd82/Raland966/Dyno111807.jpg
Boy oh boy.....Chris, you remember my dilemma??? Back after I got my stageII heads and extreme cam??? Well even after Diablo tuning it (WITH ANDY BY MY SIDE AND CMR SOFTWARE, MIGHT I ADD) I got worse numbers also!!!!! WWTTFF!!!???? And in cooler weather with way less humidity!!!!!!! I don't understand either my brotha. But I stopped worrying about it, and just let the SOTP speak for itself......haven't been to the track yet......I sympathize buddy. Chase
totally agree, but i asked what the temps were and they were all pretty much in line with one another. granted, the last srt sat for a couple of hours more than luis or mine did. but when mine went up, it was below 200 degrees for sure!!!
i agree 100% larry...... cuz i know my sled feels better now than it did last january when we did this last!!! it must, because last i checked i was closing in on the po-ho master himself salvato!!!! hahahahaha
