4th is bad enough, I believe hitting somewhere around 130-140mph. It'd still be cool to know what you dyno'd in first. I dunno. I think that you'll find that most tuners agree, but whichever you choose you just want to ensure you choose it again in the future if you're ever measuring delta due to a modification. There was a 20rwhp difference between the two. I think SRT's are pulling in 4th and RT's are in 3rd. With our 3.06 rear, the car will go past 150mph every pull. I'm gonna go with the top reason being top speed - even with our short gearing I think I'm in the 180kmph plus range when I do a 4th gear pull. I want my 4th gear AFR to be a little richer as on the street 1st - 4th are your full power gears. If you dyno in 3rd you actually have a mechanical advantage that will cause the dyno to read higher. For a better experience, please enable JavaScript in your browser before proceeding. Closed course of course... At that speed you're covering some serious ground and not everyone has that open road to do it on. But a few posts I've seen recently people said they dyno'd in 4th. Sign in with Facebook. At least with my Legacy twin turbo, max boost is not reached in the first 3 gears, and actually there is a slight difference between the max boost in 4th and 5th gear. However, proper strapping down made a much bigger difference! Tunning in 5th usually give me this result. If you ever look inside a T-5 you can see that in 4th gear there's less gear surface area then in 3rd, less friction equals more power. Going to the dyno on Saturday so I'd like to know. Fourth is the closest to 1:1 and will yield higher numbers, but I don't think the added stress to the drivetrain is worth the 3-5% unless you're strictly shooting for dyno brags. Fiesta ST Forum is the premier Fiesta ST community. BA autos are put in 3rd gear in manual mode and it will stay in 3rd until it is changed by the dyno operator after the run is complete. Its best to get the tranni to autohold a gear, this way when you mash the pedal it wont downshift on you. I think it would be pretty cool to know what you would dyno in all of your gears to see which one make the most power. Every dyno is different though, our 4th gear braked run pulls can last up to 22 seconds, this isn't ideal for showing big numbers but does show how well the car copes under pressure. At least from my experience on the dyno. 4th gear, or whatever gear is closest to 1:1 is normally a pretty good place to run the car. So I have had Tom's car on the rollers and it just made 933 RWHP yesterday in 4th gear. really the only time it will make a difference is in a turbo car due to the way a taller gear will accel the engine slower(loading) allowing boost to be achieved. Fondy. These pulls were done back to back with all variables being equal. Sign in with Twitter I've noticed some talk about how 4th gear will get slightly higher results and I think I understand why, but the place I'm going to says they do 3rd gear runs. Why are there only dynos is 3rd/4th gear? His father Mikhail, a Soviet table tennis champion in 1982, moved his family to Germany shortly after Dimitrij was born. I've always been a firm believer in running whatever gear is as close to a 1:1 ratio as possible. Also, a final drive ratio such as 3.15:1 will often show a higher power reading than a 3.37:1 ratio. :beer: Oct 21, 2005 #2. But a few posts I've seen recently people said they dyno'd in 4th. well technically yes, but it’s a whole lot easier to do it if the gear selcted has a ratio close to 1:1. I dynoed my car today. I think it is doen to slow down the accleration of the tires so the dyno has time to take more data. With mods on sig. 3rd gear produced more power than 4th gear; 158.51 hp in 3rd to 155.46 in 4th gear. What would happen if you dyno'd in first gear? What would happen if you dyno'd in first gear? I have never dynoed a car, but doesn't the operator have to enter in a bunch of parameters specific to the car in order to get an accurate reading? A quote from AZGolf: "Most cars will dyno about the same in 3rd or 4th gear. Why are there only dynos is 3rd/4th gear? The dyno pull in 4th gear is just way too short at this HP level. DYNOED IN 3rd OR 4th GEAR; If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. I think it would be pretty cool to know what you would dyno in all of your gears to see which one make the most power. Power readings recorded in fifth or sixth gear are generally higher than those performed in fourth gear. same principle if you go dyno then put a diff gear in the rear end, the numbers should not change. The final number came out to 276HP and 299ft/lbs...however, it makes me wonder which numbers they used, the pull in 3rd or in 4th. The amount of time to spin up to full rpm and overall speeds are significantly higher in fourth, which ultimately is a significant heat difference. Wouldn't first gear be your main gear in drag racing? Why 3rd gear dyno? You could not make a pull in first gear as the tires would not hold. Although fourth gear has been the “de facto standard”, some dyno operators prefer to use fifth gear, and now 6th gear, which can distort comparisons. Turbo Technics S280 Turbo Kit Dyno, Virtual Dyno, and Datalog Thread, looking for one San Jose Area owner interested in dyno testing, '19 Fiesta ST mods, plans, opinions (not a build per se). i know most people dyno in the gear that has a 1:1 ratio, but most of the time it is 4th. Just had a thought, and thought I would share. You must log in or register to reply here. Ovtcharov won one silver and three bronze medals at the Olympics between 2008 and 2016. Should I be dynoing in 4th instead? In 3rd its hits the limiter somewhere around 125. Jeff is going on an actual dyno, not doing a v-dyno run. as far as an n/a motor goes, it should not matter. If you use a lower gear, this will result in a higher torque multiplication through the gearbox and on a roller this may cause traction problems. parts for the rebuild. Here is my old Evo 8 on TT's dyno with 3rd and 4th gear back to back. It simply looks at the wheel speed versus engine RPM, calculates the correct gearing and displays the correct power output. We offer one of the largest collection of Fiesta ST related news, gallery and technical articles. JavaScript is disabled. Thanks a lot. Here is my SE-R in 3rd vs. 4th gear on another dynojet. I've done a set of 3rd gear and 4th gear pulls at two different shops. You must log in or register to reply here. I'm going to be visiting a dynamometer later this fall and wanted you guys' perspective if you have experience....is there any difference on our cars between testing it in 3rd gear vs. 4th? If you ever look inside a T-5 you can see that in 4th gear there's less gear surface area then in 3rd, less friction equals more power. UNICHIP equipped car. DYNOED IN 3rd OR 4th GEAR; If this is your first visit, be sure to check out the FAQ by clicking the link above. HSVJPL. Can we just test in any gear and still get accurate results? Tuning in 4th tends to lean out 5th gear WOT AFR. 88 Upgrade to 5 Lug/Disc Brake Conversion Confirmation of Plan. In our cars that's 4th gear. CY98Cobra New Member Established Member. They have to calculate your torque to the rear wheels, and because 4th gear is 1:1, they don't need to calculate the trans gear into the mix. Trying to measure torque would require more knowledge about the transmission and final drive ratios. Dyno in 5th gear. 4th will show the most accurate numbers. FYI, I have 4 dyno graphs of 3rd and 4th gear pulls. To do this, you would need to purchase an Early 92 3rd gear, 4th gear, 3/4 hub and slider, 3/4 springs, 3/4 keys, 3/4 shift rail, 3/4 shift fork, and other misc. 3rd run - strapped and chocked to Dyno Dynamics specs - 4th gear = 250.9kw So using 3rd instead of 4th in my A6 made 6kw difference. Just watched a video of the new 335i pulling on a dyno. There's also traction issues that can come from using lower gears, the lower the gear the more torque is generated at the wheels giving dynos a … Or sign in with one of these services. I was wondering if you guys (both NA and turbo) could post the difference between your 3rd and 4th gear dyno pulls. Wouldn't first gear be your main gear in drag racing? Hey guys, theres a thread about this over at the pulsar board and they are saying that there is a big difference between 3rd and 4th gear dyno pulls. One guy had nitrous so I assumed that was the reason. Thread starter STjake; Start date Oct 22, 2016; S. STjake Member. Load and boost conditions 2hp, but I 'm NA your experience and to keep logged. Fox, SN95.0, & 2.3L ) -General/Talk- as 3.15:1 will often show higher... This on charger forums too 'd like to know what you dyno 'd 3rd! Graphs of 3rd and 4th gear pulls at two different shops had Tom 's car the. 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Actual dyno, not doing a v-dyno run measure horsepower, and calculate torque from that and. 170+ mph Forum is the premier Fiesta ST Forum is the premier Fiesta ST news. Same principle if you dyno 'd in first gear be your main gear drag! Please enable JavaScript in your browser before proceeding of power in a gear... Rear end, the gear that has a 1:1 ratio, but most tuners will use 3rd as do.
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