Thread: VE-T blogger, dynos, movies, and pics.

I plugged the wastegate shut with a rubber expansion plug. Then did the dyno in 3rd gear so the clutch wouldn't slip. there was no difference in power made between 3rd and 4th gear on low boost. On high boost in 4th the clutch would slip. But I still get pretty close to the same numbers.

Something may be killing top end. But I don't know what it could be? I have thought of getting a new intake manifold or something. But the AFR looks to be getting too lean on high boost for my taste. The only correction made this time was a slightly bigger gap on the plugs (.029) and the plug in the bov.

Do you guys usually get past 22psi on the stock ignition without blowing the spark out? Cause even on this relatively big gap I had zero issues with missfires.

you are running a 248 deg cam.....your top end is pretty damn good considering

I went to the Utahnissans 3rd annual dyno event today. The numbers are crappy!

337whp on 15psi! at 6800rpm

358whp on 20psi at 6700rpm!

Wow, talk about disappointed! I thought I blew the motor up! I took her out for a spin to make sure everything was still good and the car runs perfect. The inductive pickup wasn't working for my dyno pulls, so the rpms were way off. I hit the rev limiter on every pull but the dyno never went over 6800rpm.

Still, even after detuning the car a bit and richening the mixture I would have made about 400whp at 20psi on this dyno if the rpms were right. I made 407 on 18psi a couple weeks ago on a very aggressive tune. I guess the extra 2* of timing and 5psi of fuel pressure really killed the power. But at least it is safer this way.

You should do a compression test and leak down just to check and make sure everything is in spec....seems interesting those numbers.....

Yup thats it high end turbo motors really need a spot on tune 1 to make power and 2 so you don't break stuff! 1 degree of timing either way can dramatically effect to power curve.

Whens the ecu going in?

The motor runs fine. I did a compression test 1 week ago and got 100 across the board. Not great numbers, but the numbers are higher than that. My small miata battery could barely crank the engine. So I am guessing that the real number is around 145-150psi. Still, even so the motor runs just like it did 3 weeks ago. Very very strong. I did not lose 80whp since the last time I dynod. It's just the rpm pickup didn't work and the calculation is wrong.

I was being sarcastic when I said the 2* and more fuel killed the power. There really hasn't been that big of a difference. Maybe 10-15whp on the same boost.

bumping up the boost to 20psi only got me 20whp over 15psi. I guess boost is overrated

what was your timing at?

This was about 14* base. I was running 18* base before. But that doesn't show why I made so much less. it shows the graph stopping at 6800rpm or so which is incorrect. I thought the motor was blown, but after driving it there is no way. I took her out last night on 18psi and it still hauls. Nothing wrong. Just different dynos.

There is no way 5psi is only 20whp. More like 60+whp until I get over 20psi.

looking at that graph i think my suspicions are confirmed, i think to need to switch cams earlier. you only have a 200deg low cam, 5000-5500rpm should be where the cam should be switched imo.

i would have a play, you could net some good gains