Contour Enthusiasts Group Archives Forums General Dyno and Drag New dyno numbers 235fwhp on 2.5L

I got my car on the dyno again today. The first pull was all my mods excluding the xcal tune. The second pull was also the stock tune, but with a 75hp zex dry shot. The third pull was the 75hp shot with a tune that warmonger made for me. He made the tune for a 100hp shot, but I didn't have the right jets and had to use a 75hp shot. Bottle pressure was about 800psi. I am not sure how much that would have effected my performance, but I defenitely need to get a bottle warmer. You can see my last dyno runs here:

Randy's first dyno runs

My tune from the almighty ADC gave me an extra 1hp and 2tq on the NA runs. Check out my first dyno runs to see the difference. Woo hoo! Let me know what you guys think. The guy who ran the dyno was a little concerned about my AFR on the second pull. He said it should cause any damage, but he would like to see it a little richer.

Nice numbers you got there Randy. I too would like to see that a lot richer. Spiking to 14:1 on a nitrous shot is a little scary on stock internals. You might need to up your injectors to keep up with the nitrous. It looks like there are reaching their limits towards the higher end. I'll talk to you more about it later. Give me a call when you get a chance. I'm up late normally. Laterz!


Robert

That torque curve is amazing. It looks like a very fun engine to rev out. Aside from the 14.0:1, that's pretty solid!

I hope the operator was guessing at 3600lbs!

Randy,

Very nice runs!

The spike towards 14:1 is a result of the secondaries opening and introducing more air before the MAF compensates. Notice it is present in the NA run but becomes more exacerbated with the nitrous.
The nitrous is adding more O2 after the maf so it is not being compensated for by the stock computer.
Is this a WET kit or DRY?

Either way it shouldn't present a problem. It can be richened up a tiny bit there I'd guess.

It is a zex dry kit.

Robsvt-t and I thought it might also be due to nitrous pooling at the secondaries, and being quickly introduced when they open up. Whatever it may be my tune could use some richening up at that point. I was really surprised to see higher horsepower using your nitrous tune. You tune had the timing retarded for a 100 shot, and I figured that would equal less horsepower than a dry shot on stock (more advanced) timing.

13:1 on nitrous is a really, really bad idea. Add fuel...soon. Closer to 11:1 would be much better.

Let me rephrase...From my past experience, I have never seen anyone tune their nitrous over 12:1 on a tail pipe sniffer. I have seen quite a few cars dyno with nitrous, but I far from know it all. In my opinion based on what I've seen, I would add fuel.

the AFR sensor was in the tail pipe.