Well we did a Chassis dyno to Engine dyno test

We dynoed this blower motor in Joshes car with a S4 and the removed it and took it to a DTS 4000 engine dyno for testing , No changes were made to the engine on the first engine dyno run .

Results



video engine dyno

chassis dyno test

after a pulley change

Chris, what is the correction factor on the engine Dyno?(nice video) Also, was the Boost when you had the engine in the car at 11 to 12psi and the engine dyno (1st pull) 14psi?

Great work

Thx
Derek

So you lost 300hp thru the trans and axles? Am I seeing that correct?

I think this ought to be in the tech section..

I was not using my boost sensor on our chassis dyno the time i dynoed the motor , i was using the boost gauge to read it in joshes car , i guess it was 2 psi off , but if you look at the video you can see it is the same pulley . This is no BS i did this test very fair , these were the results .

I also think this blower is geting close to it air flow max at 900 hp , Both blowers that we have tested have shown signs of a compressor being maxed out .

I have one more of these motors to run that we have built on the engine dyno in the next 2 weeks

I know you always call it like it is, I was just wondering the vid says 11PSI. What gear did you pull the car in on the dyno? Your engines are always top notch along with your tunning. Next time can you make a pull in a taller gear on the dyno to load the engine/blower more? I know with the whipple you will find it will make 1 to 2 more psi in the early RPM range(3500 and below) at full throttle if it is really loaded.

Derek

I always test in 4th gear , most cars are at the 100-120 mph range , With a mustang dyno you enter the weight of the car you are testing so it is loaded to the cars weight , but we do test more weight to load more for this kind of stuff , I ran this motor atleast 10 times on our dyno , and the number i posted was the heighest .

I know, I have a all wheel drive twin APU Mustang MD500 Dyno at My disposal, Great Dyno's
When are you and Josh going to Glamis? Next weekend? I will be at Road Atalanta for our last race of the year, have fun.
Derek

Wheres the blower motors you we going to send to me ? Im on a blower motor roll right now

I was wondering how long it was going to take you to put 2 and 2 together, Should be end of Nov.
More vids!!!!
Derek

36% loss seems kind of high don't you think...

i was told 25% to 30% loss is normal

On that car I could use our 1480 shaft with 934 stuff- Interesting info- Jess

ok well i know that the dyno is more of a tool to just tune so u get the most power. but really if someone is using it for the #'s they have to use the same sized tire right? well a smaller tire would give more torque id think? might be wrong but im no expert anyway.


dan

Good work Chris... Thanks for sharing that with us.

Zilla

Awesome, just too many cylinders for me

The engine speed indicator is pretty far off on that Mustang Dyno graph. Since HP = Torque * RPM/5353, the HP and Torque figures MUST cross at 5353 RPM.

On that graph, they cross at about 4900...the HP E&DS charts are only about 100 RPM off.

I thought it was 5250?

You are correct, it is 5252, to be exact.

I was reading the rpm through the rollers on our chassis dyno , so the tire groth is what put the rpm off a little , This will not affect the hp tq numbers just what peak rpms they are at , I was using the rpm channel on our dyno for EGT and fuel pressur becouse i was tuning this engine ,


This is not a BS test , I hope you guys belive this test and can apreciate this info , Becouse it cost us about $2000 to do it

They dont cross at 5252 because the HP and TQ are not graphed the same. The one has the upper limit graphed at 514 and the other at 540. If they were both graphed on a graph that maked out at 550 or 600(or whatever number higher than both), they would cross at 5252.

sick numbers

Oops, my bad...I didn't look closely enough at the scaling...just assumed they'd be the same. And my 100 rpm mistake on the HP reading was an oops too. Sure, I'll eat crow.

I was never questioning the validity of the numbers...just thought the rpm readings were off. I'd think they'd have an ignition based RPM sensor, not just the roller RPM.

I've got a question, though...if you are reading RPM off of the dyno roller, then that means you've got a gear reduction figured in to calculate engine RPM based on roller RPM, right? If that's the case, then the wheel growing should effect the final torque numbers by the amount of wheel change, not just the RPM, because wheel growth will apply a different gear ratio to the roller--afterall, if the wheel grows, then the roller will be spinning at a higher RPM than the engine, when compared to a smaller (normal sized) wheel. In fact, unless I'm wrong (again), by putting an rpm sensor on the engine itself, you should get higher torque numbers, because the engine will be turning slower than you originally thought, because the gearing is higher than originally programmed in, despite doing the same amount of work on the roller. But maybe I have it backwards...

The rpm does affect the Tq Numbers , But not that much if the Rpm is close , if the rpm is way off then the tq would be way off too ,

We can read thr rpm off the engine , but i needed the other dyno inputs for tuning this time ,

Gear ratio is not inputted in a mustang dyno , What you do is run the car in the gear you want to run , then get it to 3000 rpm , hold it there, then sync the dyno to the car you are running .

Dyno jets though are affected buy mph , the heigher the mph you are testing at the heighr the whp numbers are , Reason is they measure whp and wtq buy how fast you can turn the Big Drum they use , Mustang dynos and some other dynos 2 roller type measure buy using a Current Eddy and a load cell , so the dyno applys a even load to the car you are testing , we can in put 10 lb to 10000lbs in to the dyno to produce a load that is the same as the cars weight , So mph will not affect the WHP numbers ,

That sounds like a neat setup...is it more accurate than a Dynojet?

Yes its 5250..

Thats what i have been told

DynoJet is the Huffy of dyno's. I like the DynoPac dyno's as there dynos bolt to the hubs and have no tire noise and are also very configurable to do RPM steeping checks 2000 rpm hold for 1.5 sec goto 2200 rpm hold for 1.5 sec 2400 rpm hold for 1.5 sec.. Great for data acquisition for tuning though they only hold like 700-800WHP

that sounded eff*in sick!

I believe it. When I posted a similar test a couple of years ago with a car with an Albins that had 38% loss, people called me nuts. I think the loss through the trans, CVs, and brake drag (if any) is a lot more than most people think it is.

I guess so because I keep seeing all these posts with people expecting to see 24%-26% loss. If it was only 36% loss the 10% difference on a 400hp car would be 40hp. You would be really bummed if the number you got was 40-50hp lower than you thought.

help me understand this. the lost hp must be turned into heat, correct? 300 hp converted to heat, how is that possible?

No problem. You ever touch the trans after driving it around? How about the CVs? The trans and cvs get really hot. Thats what the trans oil and cv greese are for. They keep the parts lubed and keep them from getting too hot.

now all we have to do it harvest the heat and change it back into horse power hehe- Jess

oh yeh Hey Chris muzio are you buisy- ? I called and left a measage a few days ago - never got a call back- Jess

I have been running the Haltech booth at the SEMA show in vegas , Just got back today ,

Give me a call next week , would love to take your call ,

ok- Sorry man- I almost forgot about Sema hehe- Jess