Ok, I need help finding out my Max Hp to the Fly wheel. Any help will be appricated. I just got my car back this morning from TriPoint, and I got the Dyno sheet here infront of me, but it isn't any pretty graph like most normal dyno sheets, but a collum of numbers instead. but rather then type out everything, I'll just type in portion of where my Max HP comes in :

Set # 3: 14 psi Max HP 250 & 336 Torq at 7000 RPM

Emissions Under Load (ppm/%)

Ambient Temp: 92 deg F
Baro. Press. : 733 mm HG
Rel. Hum: 29.9 %

HC ppm : 122
CO % : 5.0
CO2 % : 10.8
NO ppm : 39
O2 % : 0.0
MPH : 99
Load Ft-1b : 336.9
HP : 250.1
Acc MPH/s : 5.2
RPM : 7000

Thats at my max boost setting, and running on J-Spec sequntial twin turbos, an EFI system, and most of your basic bolt ons. The Hp looks really low to me, but I asked the guy what most stock Rx-7's get on thier Dyno, and he told me most get 120 Hp. I'm figuring Im running some where around 350-425 Hp to the fly wheel, but I would like a more accurate figure, if anyone can help me out.

 

Not sure about the dyno figures, but your FD sure is purty

 

Something isn't right...250 hp and 336 tq at 7000rpm? Thats totally contradictory to a rotary's output. Mine made 350hp at 7000 rpm and 255 torque. What kind of dyno is this? 120 hp on a stock RX-7??? ..most are over 200, even on 'mustang' dynos.

 

Im not sure exactly what kinda dyno TriPoint is using, but it says:

Copyright (c) 1995, Automotive Diagnostics, A Division of SPX Corp. All Rights Reserved

Im sorry I dont have a scanned pic of my Dynosheet yet, Im going to go out and see if I can find a scanner and copy this stupid thing. Has anyone else here gotten thier car Dynoed at TRIPOINT ENGINEERING in Canoga Park? Just wondering what some of you guys might have gotten on thier Dyno. Anyways everyone looks as confussed as I am about my results. 250 Hp & 336 Tq doesn't sound right... unless Im missing something.

 

It sounds like they messed up. I've never seen a rotary run higher torque than rwhp.

Those #'s look right in reverse, most 3rd Gens with the standard bolt ons would run more like 336RWHP and 250 torque. Especially running 14psi!!!!!

I think the #'s are backwards or maybe your just reading the sheet wrong.

Did you tires hook up good on the dyno???

What mods do you have??? Your car would have to be a monster to pull 336 Torque!!!

Later,

 

I just had another talk with TriPoint and what they have explained to me is that my Hp and Torque rating is consistant with what they have on thier Clayton Emissions Dyno. They told me that thier dynos are not like most other JetDynos, since thiers is an emmisons Dyno and give lower HP ratings, but Torque should be consistant with other Jet Dynos. Apperantly a stock FD gets 170 Hp on thier Dynos, not 120. They also told me that my car pulled that tourqe (336 tq) rating cause of the gearing on my car. Wrong or not, however, my car does feel like it has alot more tourqe, and definatly alot more then 250 Hp. (I tried to race an M5, Supra, and new Carrea 4, but none would play. But I ran into a Bike on the 5 frwy and pulled on him, think it was a GSR, not sure though, both got up to 120 mph atleast)

Anyways I have a good amount of mods on my car, and I might miss a few: Racing Beat exhaust, Tripoint midpipe and down pipe, new J spec motor and sequnitial turbos, BFMIC, HKS Superflow intake, Dual ARC BOVs, PMS EFI with boost controller, Turbonetics clams and hoses, tweeked injector and Plugs and wires, lots and lots of dyno tuning, and a couple of little other things.

Anyways Im curious to see what my car would run on a JetDyno, so I'll try to find one just to see what my rwhp would be.

 

Sorry man..... but something is wrong with those numbers !!!

If your car pulled 336 RWT then you're craking ~ 450 RWH or more....

I think either those numbers are reversed or they have the dyno tach signal wrong on the settings. On the the dynojet you could change the tack to pick up the signal every 90, 120, 180 and 360 degrees.... if the input is wrong then your numbers are wrong !!!

Gearing will not affect a dynojet, not sure about the Clayton unit *but* it shouldn't.

John D

 

ok here's the sheet you guys read it and tell me if I read it wrong.

 

whoops!

 

336 lb-ft @ 7000 RPM = 448 HP

That dyno reading might be useful for tuning, but it is not comparable to a DynoJet, and seems pretty whacked out generally. If a stock FD usually makes 215 on a DynoJet and it usually reads 170 on the Tri-Point dyno, you might be able to apply that ratio and get a rough estimate of 316 HP for your car. However that seems low for tuned car with your mods at 14 psi unless you have an auto tranny, so perhaps that isn't a valid calc.

The tach reading was not correct on the sheet, so they may have only been able to read the wheel torque, with no conversion back to engine torque.

If you want numbers that you can compare to other (U.S.) cars, go to a shop with a DynoJet and get a new test.

-Max

 

Thank you Max. Finally ... a resonable response. And no I do not have an automatic (why would anyone fix up an auto FD?). And your right. Thier main concern with the car was tuning. Which I paid alot for, and thats what I got, but I asked to see the dyno results, so I could figure out where my HP would stand with others. But unfortunatly, after the Dyno tuning, during some test drives, some grimlines started to rear its ugly head. Like cracked or loose vacume hoses I need to retie, and an exposed EGR vavle. So I need to get those fix first before I make another attempt at the DynoJet.

 

I know when i went to a dyno they spent time calibrating thier maching with my rpms, so that the car and dyno was reading the same rpm. It seems by looking at your sheet that the rpm is WAAYYYY off. They probably didnt worry about it since they were just tuning and not looking for a hp reading. I think thats why there is so much difference, they didnt spend the extra time to calibrate the rpms

Later,

 

Your torque cannot be higher than your HP above 5250 RPM due to how everything is calculated.

HP = ( Torque * RPM ) / 5250

Just inserting your numbers into the equation makes a false equation:

250 = (336 * 7000) / 5250

Now if you reverse your HP and torque figures you will get true equation:

336 = (250 * 7000) / 5252

Granted the equation is off by ~3RWHP that can be a variance in RPM that they recorded.

Your numbers are not bad, just backwards.