I have finally convinced my boss to buy a dyno. We are currently looking in to Dyno Dynamics, and Dyna Pak. I have always favored the Dyan Pak, until i saw that it uses hub speed to read RPM. OK, sound fine till I try to dyno a 1970 Chevy Nova with a Manuel rev. valve bodied turbo 400 with a 4100 RPM stall speed. How are you guys that own and operate a dyna pak getting past this? I called Dyan Pak today and they said that there has been research into a RPM hook up, and that it has been going on for 4 years, with no end in site. Please help i don't wanna give up on dyan pak yet.

 

Check mine out Dynojet 248.

http://cgi.ebay.com/ws/eBayISA...US:IT

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aggressivemotorsports &raquo;</TD></TR><TR><TD CLASS="quote">Check mine out Dynojet 248.

http://cgi.ebay.com/ws/eBayISA...US:IT</TD></TR></TABLE>



way to help.

Fulldrag, maybe you could try calling a shop who has been using the dynapacks for awhile. Redshift in PA, Evans tuning, church automotive, etc.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aggressivemotorsports &raquo;</TD></TR><TR><TD CLASS="quote">Check mine out Dynojet 248.

http://cgi.ebay.com/ws/eBayISA...US:IT</TD></TR></TABLE>I thank you for your offer but we obltierated two brand new tires on a 600 hp SC mustang Cobra on a dyno jet and had to buy the customer new tires. Thanks to Extreme Motorsports dyno jet. we put the same cobra on a dyna pak and also a dyno dyanmics and had no probs. Thats why we are looking to purchase one of those, but i am wokdering why dyan pak has no external rpm pick up. or how to get around it.

 

What do you mean how to get around it? I'm not really sure what you're asking about an RPM pickup. Since you need to enter the gear ratios for your car in order to get the correct torque readings, the engine RPM is calculated in the same way from the speed that the hub is rotating at. Is there something different about trying to dyno a car with an automatic that has a high stall speed?

 

wow the lack of knowledge on this site about the way an automatic trans with a stall converter works is just amazing. A car with a stall converter will not have a wheel speed untill that specific RPM ( well it will but very minor wheel speed). which means the dyno wont understand what is going on. like dynoing a stick car with a slipping clutch, the moment the clutch begins to slip RPM will rise but wheel speed will not. which means the dyno will not know that. In other words the RPM the dyno sees will not be the RPM the engine is at, reguardless of the info you imput into the dyno IE final drive , gear ratio, that all means ka ka cause the dyno doenst have a direct RPM hook up, I called dyna pak and they have been trying for 4 years to fix up an RPM probe. I was just wondering how other dyna pak owners are getting past this or have they experienced this problem. or any imput on Dyno dynamics products would also be nice.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fulldragcrx &raquo;</TD></TR><TR><TD CLASS="quote">wow the lack of knowledge on this site about the way an automatic trans with a stall converter works is just amazing. A car with a stall converter will not have a wheel speed untill that specific RPM ( well it will but very minor wheel speed). which means the dyno wont understand what is going on. like dynoing a stick car with a slipping clutch, the moment the clutch begins to slip RPM will rise but wheel speed will not. which means the dyno will not know that. In other words the RPM the dyno sees will not be the RPM the engine is at, reguardless of the info you imput into the dyno IE final drive , gear ratio, that all means ka ka cause the dyno doenst have a direct RPM hook up, I called dyna pak and they have been trying for 4 years to fix up an RPM probe. I was just wondering how other dyna pak owners are getting past this or have they experienced this problem. or any imput on Dyno dynamics products would also be nice.</TD></TR></TABLE>

Very few people on this site run automatics because there hasn't been much effort to develop the automatic in Hondas. Also, I think a lot of the guys that have V8s with built automatics tend to still be running carburetors with basic ignition setups and not tuning them on a dyno.

I admit I don't know much about automatics with stall converters. My question is once its past that specific RPM, say with a 3000RPM stall speed, the engine RPM can be calculated based upon gear ratios, correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by entr0py &raquo;</TD></TR><TR><TD CLASS="quote">

Very few people on this site run automatics because there hasn't been much effort to develop the automatic in Hondas. Also, I think a lot of the guys that have V8s with built automatics tend to still be running carburetors with basic ignition setups and not tuning them on a dyno.

I admit I don't know much about automatics with stall converters. My question is once its past that specific RPM, say with a 3000RPM stall speed, the engine RPM can be calculated based upon gear ratios, correct?</TD></TR></TABLE>

Quite a few of the guys that run automatics with high stall torque convertors also run stand alone engine managment with twin turbo's, single turbo's, positive displacement superchargers, and centrifugial superchargers. With artificial aspiration I believe that you will agree that EFI is the way to go. Many of our customers have dual duty vehicles not TRACK ONLY. Thus our customers need a vehicle that will drive moderatly well on the street (not stall, sputter, die). If we tune a vehicle based on wheel speed the corolating RPM in the ecu map will not be the same. Once a torque convertor LOCKS it will drive in CLOSE TO, not exactly a 1:1 ratio. Torque convertors never FULLY lock up like a clutch. Another issue is IF the vehicle has a lock up torque convertor AT ALL. Hence our original issue with hub speed to calculate engine rpm.

Dyno Dynamics gets the tach signal (rpm signal) via the ignition system, injector probe, a pad you can lay over the valve cover, hub speed, ac voltage cycle via cigaret lighter socket etc .... I can't remember them all. HOWEVER the dynapack software is sooo much easier to navigate, use, and is just simply a lot less cumbersome. As a result, if dyna pack did have a way to get a tach signal other then hub speed I would purchase on yesterday.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fulldragcrx &raquo;</TD></TR><TR><TD CLASS="quote">wow the lack of knowledge on this site about the way an automatic trans with a stall converter works is just amazing. A car with a stall converter will not have a wheel speed untill that specific RPM ( well it will but very minor wheel speed). which means the dyno wont understand what is going on. like dynoing a stick car with a slipping clutch, the moment the clutch begins to slip RPM will rise but wheel speed will not. which means the dyno will not know that. In other words the RPM the dyno sees will not be the RPM the engine is at, reguardless of the info you imput into the dyno IE final drive , gear ratio, that all means ka ka cause the dyno doenst have a direct RPM hook up, I called dyna pak and they have been trying for 4 years to fix up an RPM probe. I was just wondering how other dyna pak owners are getting past this or have they experienced this problem. or any imput on Dyno dynamics products would also be nice.</TD></TR></TABLE>

It seems to me you know all the answers.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aggressivemotorsports &raquo;</TD></TR><TR><TD CLASS="quote">
It seems to me you know all the answers. </TD></TR></TABLE>

yeah... is this a trick post?

 

I swear to god, you people think I have nothing better to do than ask questions on this site. If that's what you believe, your dead wrong. If anyone with a good head on their shoulders would read the entire post, then you would understand where i am coming from. I mean just read some of the reply posts i have received back. They can only be from a persons' that cant answer my question, or people like yourselves who are just trying to raise their post count.

Secondly, this post was originally in the tech/misc section of this site and I received no help there either. Just more people trying to sell me their used dyno.
Lastly, since my question has yet to be answerd; wouldn't you think its a question worth asking? I mean since not a single reply has any form of problem solving or experimentation as to the resolution to my problem?

I apologize to those who are trying to help, but i just cant believe that Dyna pak has no way to get a real live RPM signal.

 

I think the biggest reason why you're nto getting a response is because most of the tuners in here use the dyno jet or the mustang

I only know of a few shops htat have a dynapak

 

OK OK
I do understand your question and if I had the answer I would of posted it a long time ago.I also understand that this forum is about 99 percent Honda stick cars.There still seems like very little crossover shops doing both imports and domestics.With that said I did a little research for you.
This is a site with Dynapack users http://www.pe-tuning.com/dyno.htm

This guy does Mustangs that I'm sure there are plenty of auto's.
http://www.mustangmall.com

Give some of these guys a call and find out how they're working around the pickup issue
Glenn And please post the results,I have some time invested now.lol