chassis dyno vs dynojet?
chassis dyno vs dynojet?
Hey guys, I think I read somewhere that a chassis dyno is better for tuning than a dynojet, mustang? Is this true and how so? I'm asking becuz I plan to hit the dyno for tuning....not necessarily looking to break any HP records...just want a straight, flat AFR line....will a chassis dyno be easier to get a flat AFR than a dynojet?
Thanks!
Thanks!
Dynojet is a chassis dyno.
Chassis dyno = dyno that you put the whole car on
engine dyno = dyno that you just hook the engine to without the engine being in the car.
You are thinking of a load dyno which loads the car in a more "real world" way so that your tune is based on load your car would see on the street. Load dynos are Mustang, Dynapack, etc. Load dynos are considered "better" for tuning though I've started to think recently that the difference may not be all that significant if you have a tuner who knows what he's doing. AMS (worlds highest HP evo) uses a dynojet (not a load dyno), SVS uses a dynojet (1800hp vipers running 8s, 600hp 350Zs, 800hp MR2s, etc).
Chassis dyno = dyno that you put the whole car on
engine dyno = dyno that you just hook the engine to without the engine being in the car.
You are thinking of a load dyno which loads the car in a more "real world" way so that your tune is based on load your car would see on the street. Load dynos are Mustang, Dynapack, etc. Load dynos are considered "better" for tuning though I've started to think recently that the difference may not be all that significant if you have a tuner who knows what he's doing. AMS (worlds highest HP evo) uses a dynojet (not a load dyno), SVS uses a dynojet (1800hp vipers running 8s, 600hp 350Zs, 800hp MR2s, etc).
OHhh my bad..SO Dynopack, Mustang are "supposedly" better tuning? I'm not looking to break HP records...just a nice flat line...
two local shops here in Cali offer dyno timing....one has a Dynapack (bolts onto the hubs) and the other has Dynojet.....which one would ya'll pick if you were in my shoes? I'm tuning with a V-afcii anyway
two local shops here in Cali offer dyno timing....one has a Dynapack (bolts onto the hubs) and the other has Dynojet.....which one would ya'll pick if you were in my shoes? I'm tuning with a V-afcii anyway
all else being equal i'd go with the dynapack because it does load the car up more. im just saying that I don't believe the difference between the two types is as significant as some people might suggest if the tuner knows what he is doing.
nice....I'm tryin to call around a few places to see if they can let me rent the dyno....I will do the tuning myself and just pay them for roller times....I know R&D with the dynojet dyno charges $150/hr for tuning services....but I wonder how much it would be without tuning...hmm
Originally Posted by steven88
nice....I'm tryin to call around a few places to see if they can let me rent the dyno....I will do the tuning myself and just pay them for roller times....I know R&D with the dynojet dyno charges $150/hr for tuning services....but I wonder how much it would be without tuning...hmm
Originally Posted by Puppetmaster
How many runs do ya plan on doing (baseline + tuning)? Just curious....
Tony said hes not sure if he can come through on certain dates....hes a pretty busy guy and I needa back up plan...so I'm gonna call around place to see how much they charge for roller time & I do the tuning myself....if it's in the $50-$75 per hour range...I might just buy 2hrs worth and definitely get my AFR to be flat!
Tony said tuning with the Vafcii is easy....i'll just get him to teach me over the internet so i'll be prepared when I roll up to the tuning shop...
Mike and I tuned his SAFC-II on his turbo car to get his AFR from untuned to flat in like 20 minutes on the road. They are really easy to use.
BTW $150 an hour sounds pretty high. Most places are usually $100 an hour in my experience. If you are going to be doing the tuning entirely yourself I'd just go with the place that has the cheapest dyno time. Also check to make sure they let you operate the car on the dyno yourself, some places won't let you operate it yourself and insist that they have an employee operate the car. Obviously you don't want a place like that if you plan on tuning things yourself unless you just want to sit in the passenger seat and mess with the VAFC.
Also the load vs non load thing is more of an issue for turbo cars, being as how quickly a turbo car spools is based on engine load. On an NA car like yours the difference will be much less, and so the use of a load bearing dyno vs a non-load dyno is even less of a concern for you in my personal opinion.
BTW $150 an hour sounds pretty high. Most places are usually $100 an hour in my experience. If you are going to be doing the tuning entirely yourself I'd just go with the place that has the cheapest dyno time. Also check to make sure they let you operate the car on the dyno yourself, some places won't let you operate it yourself and insist that they have an employee operate the car. Obviously you don't want a place like that if you plan on tuning things yourself unless you just want to sit in the passenger seat and mess with the VAFC.
Also the load vs non load thing is more of an issue for turbo cars, being as how quickly a turbo car spools is based on engine load. On an NA car like yours the difference will be much less, and so the use of a load bearing dyno vs a non-load dyno is even less of a concern for you in my personal opinion.
Originally Posted by Nealoc187
Mike and I tuned his SAFC-II on his turbo car to get his AFR from untuned to flat in like 20 minutes on the road. They are really easy to use.
BTW $150 an hour sounds pretty high. Most places are usually $100 an hour in my experience. If you are going to be doing the tuning entirely yourself I'd just go with the place that has the cheapest dyno time. Also check to make sure they let you operate the car on the dyno yourself, some places won't let you operate it yourself and insist that they have an employee operate the car. Obviously you don't want a place like that if you plan on tuning things yourself unless you just want to sit in the passenger seat and mess with the VAFC.
Also the load vs non load thing is more of an issue for turbo cars, being as how quickly a turbo car spools is based on engine load. On an NA car like yours the difference will be much less, and so the use of a load bearing dyno vs a non-load dyno is even less of a concern for you in my personal opinion.
BTW $150 an hour sounds pretty high. Most places are usually $100 an hour in my experience. If you are going to be doing the tuning entirely yourself I'd just go with the place that has the cheapest dyno time. Also check to make sure they let you operate the car on the dyno yourself, some places won't let you operate it yourself and insist that they have an employee operate the car. Obviously you don't want a place like that if you plan on tuning things yourself unless you just want to sit in the passenger seat and mess with the VAFC.
Also the load vs non load thing is more of an issue for turbo cars, being as how quickly a turbo car spools is based on engine load. On an NA car like yours the difference will be much less, and so the use of a load bearing dyno vs a non-load dyno is even less of a concern for you in my personal opinion.
Neal, since you say NA cars dont benefit as much on dynapacks....you do suggest I try looking for a shop that uses dynojet....so I can get a nice tune + get "accurate" whp? I know dynapacks read 12% or so higher....which makes is fairly inaccurate compared to the majority of dynojet users on this board...
Originally Posted by steven88
Neal, since you say NA cars dont benefit as much on dynapacks....you do suggest I try looking for a shop that uses dynojet....so I can get a nice tune + get "accurate" whp? I know dynapacks read 12% or so higher....which makes is fairly inaccurate compared to the majority of dynojet users on this board...
Unless you have a established relationship with a shop it may be difficult to find a place to let you be within 5 feet of the car while it's on the dyno. Alot of places are really stingy about that because of their insurance policies. I went to a place one time where they asked me to actually stand outside about 30ft away. But I have also been to places where I drove my own car and did my own tuning.
Not counting getting the car set up and strapped down, it shouldn't take more than 45 min to tune AFR with an VAFC. Maybe 4-5 pulls if you know what your doing.
Again, unless you have a relationship with a place I wouldn't count on them letting you get too involved. It's just how these places are.
Neal is right about a load dyno being more important with a turbo car. I see about full lb of boost more on the street than I do on a dynojet and that is an easy 20whp difference. An NA car won't have that variable.
Not counting getting the car set up and strapped down, it shouldn't take more than 45 min to tune AFR with an VAFC. Maybe 4-5 pulls if you know what your doing.
Again, unless you have a relationship with a place I wouldn't count on them letting you get too involved. It's just how these places are.
Neal is right about a load dyno being more important with a turbo car. I see about full lb of boost more on the street than I do on a dynojet and that is an easy 20whp difference. An NA car won't have that variable.
If you're only tunning with a VAFC then the difference is insignificant. Those are precise enough to really make night and day changes ever 50RPM. Its always been my belief that full standalone would benifit from being tuned on a loaded dyno.
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