I think I am going to blow up. Help me analize this dyno sheet
 

Well,
since my last dyno tune at Rotary Performance I added a resonated Mp and Greddy 2 Row...That dyno graph can be foundHERE

Well, I went to our local dyno shop that's been open since July 03..I just found out we had one this week...The guy has no experience with rotaries so he asked which was the leading and which was the trailing plugs...So I pointed them out...I don't know why but it took him the first run to get an accurate RPM reading...Anyway, the first run I did at 10psi and got 304rwhp

The 2nd & 3rd run he got the RPM on nose. Anyway, the numbers were

316.6 rwhp & 280.2 tq @ 14psi
317.6 rwhp & 280.3 tq @ 14psi

Anyway, I really don't know much about AFR but what I do know, this seems high...What do you think?...The good thing is, I didn't blow up on the dyno....And I am going for a rebuild soon anyway.

the addition of the MP and FMIC at 10psi gained a whole 49rwhp! I didn't expect that much. Anyway. Let me know what you think.

The next move is bridgeport, gt35/40 single kit and tune by Steve Kahn at Gotham

It was a dyno jet if you are wondering.

http://www.apneablue.com/rx7/photos/...dyno_14psi.jpg

I say your fine.

And honestly, contrary to urban legend, I only know of one person who has blown up on the DYNO, so I think it's actually a really rare case.

are u braking up between 4500 and 5000rpm why dose the curve look Irregular. By the way im just asking i dont know anything about reading a dyno graph.

Regards

Erdin

I don't know. You are above 12:1 through out the peak torque range. That's asking for trouble IMO. 11.5:1 would give you a bit more margin of safety.

How was the A/F measured? Tailpipe sniffer? If so, was their sensor clean and in good condition?

Also, it looks like you made a nice jump in power but you can't really compare the output of two different dynos. If you saw how easy it is to drastically change the numbers, you would see what I mean.

Nice numbers at any rate.

Those seem like good numbers to me. Just wondering, what highest % the PFC is reading for your injector duty?

I noticed your high RPMs are choppy, I think that can be plugs, or even more you may need a hotter ignition (like HKS or such).

Agreed that the high-rpm breakup on your graphs is a definite problem. Also agree with rynberg that-- if the a/f measurement is accurate, which is 50/50-- that you are treading on thin ice, and that making comparisons between dynos is hopeless due to myriad variations that can come into play.

Erdin,

The hump between 4500 and 5000 is the secondary turbo coming on line, it's normal for it to be like that on a dyno sheet. I agree with Rynberg and Kento, richen it up from 4400 to 6600 on the PFC.

Tim

I have a feeling that the spark could be a big issue with your high RPM gains. BTW do grounds for the hell of it, if you havent already. I noticed a smoother acceleration. Yet either way I highly suggest HKS Twin Power.

Thanks Tim I thought it i may be the turbo.

It was a tailpipe sniffer. It was clean and this guy is using all new shit. Well, new meaning bought it all July 03....As for the Injector Duty, I honestly forgot to look...But when I am doing the same pull on the street I am at about 87-89%

I was kinda wondering what caused all that breakup in the high rpm...i'm guessing plugs would be it...they haven't been changed in over a year.

Right now I am not going to bother changing out anything. I am less than 300 miles from the rebuild and single install so I will change whatever needs to be done then....This was my last good bye dyno for the twins.

i have a single turbo and my high rpms break up like that. we couldnt figure it out. i have an msd digital 6 plus on the leading plugs as well. i think im gonna switch out the leading coil and ground the hell outta my car.

paul

You need to add fuel ASAP, I wouldnt be getting into the boost till you get tuned. Also, you need to try and figure out your ignition prob. I'd go over all your ignition connections, replace the leading coil with a TII coil, and replace your sparkplugs with 9's

STEPHEN

i would say thats really lean too... you need much more fuel, I woudlent drive my car like that, i never go above 11.5

304@10psi vs. 317@14psi

I'm suprised 4psi additional boost netted only 13HP. Especially with a front-mount. Maybe it's because of the RPMs being off. Do you have a plot of the 10psi run?

You know, I thought the same thing. I think I read somewhere that you get about 15hp for each pound you increase. I don't have the 10psi Run but I think I can get it...The dude at the dynojet saves everyones dyno sheet on the system so I will ask him if I can send me a jpg of it..

You were getting high-rpm breakup (shown on your dyno graph), which means that your engine wasn't putting down its optimum power.

There's no real set "rule" for "psi to hp". There's plenty of variables involved, not the least of which is what type of turbos you're using. With the stock twins, you're stretching the limits of efficiency at 14 psi, meaning that as the boost goes up, the power gain is less.

http://home.bellsouth.net/coDataImag...63dynorun1.jpg

heres what mine looks like. . . im gonna ship off my injectors and add a lot of grounds.

paul

i agree...you are very lean up there. i lost my brand new motor courtesy of lean conditions like that.

you are best with 11.2:1 all the way across except for vacuum.

11.5 is pushing it...thats the upper limit of safety.

twin turbo teddy is wrong. period.


j

what are you mods for reference before and after?

My mods are everything in my sig..

Here's the plot of the 1st run at 10psi. Unfortunately neither of us knew what plug to put that thingy on so he didn't get the RPM reading...also the first run is not done with the AFR sniffer.

https://www.rx7club.com//attachment....postid=2791337