Steve Kan came to St.Louis to tune our cars. We went to Axis racing to use their Dyno Dynamics dyno. Before we went, we knew that their dyno read lower than others. Roughly 20%.

This is Johns dyno at 15psi, 355whp, after conversion around 430wp something.



John the decided to toss his car on a dynojet. Here is his 12 psi run, 344whp with afr's in the 9's with fouled plugs



Here is his 15 psi run, 418whp. Unfortunatly his plugs fouled and afr's were in the 9's




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Here is information about this turbo

AF61R specs as follows

t-4 flange

modular center/backwall

.313 dia. shaft

compressor has 4" inlet x 3" outlet

1.0 divided turbine w/4" outlet

small "Q" trim turbine 76mm x 68mm

compressor is 61mm x 84mm rated 82% @ 18psi 64#/min.


$750 ( V-band and flange are sold seperatly for 55.00 )




Thanks, Ron.

 

finally we got theese f'in sheets on this forum. thank u lupe

 

My third pull was a little scary It happened quickly thats why i let off before 7000 rpm, luckily car dropped back down to a perfect idle. I drove it home at 12 psi about 30 mile drive boosting occasionally and did not feel anything wrong.

 

Nice John. Mikes car should be interesting at 20+.

 

I wonder why the a/f gone in the 9's so early. I remembered adjusting the air temp map to make sure it was good. Was the air temp high on those run? Also, based on those a/f ratio, I wonder how accurate their wideband is. I think I remembered richen some areas up at higher rpm because of your fuel pressure dropping and the a/f was leaning out quick at higher rpm. I wonder if your fuel pressue came back up on those runs?

I just realize that we made decent hp on the 2nd pull on the dyno. Not bad from creating the map from scratch and just estimating the injector time based on his mods. I guess spending 30mins remapping everything was worth saving me the time adjusting the map after each pull. We should have just let the car sit somewhere else instead of wasting the money sitting on the dyno for that.

 

If you take the sample point of 5250rpm, (as torque/hp crosses here)
The Dyno dynamics shows 250 ft/lbs
the Dynojet rollers shows 280 ft/lbs

If my basic math is correct its roughly a 10-11% difference

another thing on the 15 psi run on the dynojet you have a sudden
increase of power on your run 2 at 5800 and at run 3 the curve dropped back down like the dynodynamics run and the 12 psi runs....
what happen here?

as i cant really see the dyno sheet #'s if my #'s or math is wrong
please correct me

all things aside good to see another 400+ @15psi RX-7

 

"we knew that their dyno read lower than others. Roughly 20%."


Only way to vailidate this claim is take it for one run on a dynojet. I know this has caused alot of discussion on the forum. Best way to kill all that talk is just buy three pulls on a dynojet for 50 bucks.

 

your analogy doesn't even work since both dyno loads up differently. why not using lower rpm or higher rpm for comparsion? why doing the peak torque?

try 4000rpm. dynaomics shows 150ft/lbs, dynojet shows 180ft/lbs-190ft/lbs

that adds up to 20% to me.

 

i used 5250rpm just as a easy sample point as i cant really see and point out other #'s on the sheet... its a little smalll

the weird part is that on this 15psi run why are the A/F's in the 9's after you tuned it??? weird... is there a A/F reading for the dyno dynamics pull? John are you sure you were hitting 15psi?

I can see a little bit of difference in A/F's from time to time but dropping in the 9's?

 

"try 4000rpm. dynaomics shows 150ft/lbs, dynojet shows 180ft/lbs-190ft/lbs
that adds up to 20% to me."

That's part of my point. All that's needed to end this is a dynojet/mustang dyno pull that the rest of the world uses as a universal power measurement. Its not universally known to just add 20% to every dyno sheet because I think their are to many variables for that to be used.

 

When is this turbo hitting full boost? well i gues i should say 15psi

 

would you say this turbo would be far superior to a T61 with a Q-trim.

 

apparently the owner of the dyno figure out the 20% number based on a few hundred cars numbers he made vs. the dynojet from those cars. None of us came up with the %. We were told to use 20% to translate to dynojet #'s. I think it would be fair for all the doubter to reimburse john for making the pull on dynojet $75? just to prove his hp claim.


If I have doubts on somebody's number and he prove me wrong, I sure would be happy to reimburse him for it.

 

I agree, time to pay up.

 

damn 1 dynojet pull is 75 bucks? where is this? and I don't think anyone is trying to prove you wrong I just suggested that taking the word of the owner that you should add 20% to the numbers of all his dyno'd cars is not a good measurement. By pulling one pull on a dyno jet with dispell all question. The bad side of this is everyone now will come with stories that they have been told from the owner of the dyno that they should add "X" number to the pull and we have no reliable source to guage from. Its not a good trend to set.

 

Pay up suckers.

 

I knew his 20% numbers were accurate. Last year, mine dyno'd 315whp on the dyno dynamics and I trapped between 122-124 mph. I have many friends who've dyno'd their cars their and proved the 20% by running their cars at the track.

 

I agree to also now i need new plugs pony up the dough haters

 

lay off the weed kid.

 

Ur funny steroid

 

Lookin good

 

Nice dyno sheets. I'm glad to see them posted up now. The AF61 seems like quite a turbo and at a great price. I hope that you continue to enjoy your car with such a killer setup. Drive safe bro.

 

I think he made 3 pulls according to the dynochart that shows 4xxrwhp. I'm pretty sure its around $75/3pulls.

I'm not the one that needs reimbursement, i'm just making the suggestion. It's really up to John if that is what he wants.

 

Just got back from an adrenaline rush of a ride after changing the plus. PLuto afrs looked to be around 10- 10.5 on my zeitronix wideband.

I dont want a reinburstment thogh it would be nice, i just wanted to shut every one up about the 20 % crap. which it seems that there are not as many haters on this thread

 

did you change the fuel filter after the tune? I remembered it was running lean at higher rpm, so I richen it up 8% from 6krpm -8krpm.