Why am I hitting a power wall with my stroked RB25?

[GTSBoy]

4 minutes ago, r32-25t said:

What size is the exhaust 

On 02/10/2025 at 6:36 AM, TurboTapin said:

I have a 4" downpipe and 3.5" line with two open dumps.

 

[GTSBoy]

23 hours ago, TurboTapin said:

600-700whp isn't in the most efficient area and is close to the choke line. 800whp is well off the map.

I'm a little confused. The choke line is the far left side of the map, and you're on the right of centre. Did you mean something else? Maybe the dotted line running up the middle of the island? That's just following the peak efficiency line. It's nothing to be worried about.

[Dose Pipe Sutututu]

Post up your timing map  

[TurboTapin]

9 minutes ago, GTSBoy said:

I'm a little confused. The choke line is the far left side of the map, and you're on the right of centre. Did you mean something else? Maybe the dotted line running up the middle of the island? That's just following the peak efficiency line. It's nothing to be worried about.

You're thinking surge line. Choke line is far right line. I'm well out of the efficiency islands and somewhere around 730whp would put me past the choke line. 

[GTSBoy]

8 minutes ago, TurboTapin said:

You're thinking surge line. Choke line is far right line. I'm well out of the efficiency islands and somewhere around 730whp would put me past the choke line. 

Hahaha! You're correct. Total brain fart on my behalf. Sheesh.

[TurboTapin]

43 minutes ago, Dose Pipe Sutututu said:

Post up your timing map  

Here's my base ignition. +3 correction to redline when shooting water/meth which is always on. Looking at my old ignition table, I should be able to add 1-2 degree's next time I'm on the dyno. 

Let me know your thoughts. 

[Dose Pipe Sutututu]

Given you're running a 2.8 and my 2.5 is not really like for like, I suspect there could be a bit more timing you could give it.

What is the kW yield per degree you're putting through it?

Here's my E85 map to give you an idea, where it was I could still get another 3~4kW per degree thrown at it.

 

[TurboTapin]

21 hours ago, Dose Pipe Sutututu said:

Given you're running a 2.8 and my 2.5 is not really like for like, I suspect there could be a bit more timing you could give it.

What is the kW yield per degree you're putting through it?

Here's my E85 map to give you an idea, where it was I could still get another 3~4kW per degree thrown at it.

 

Thanks for this! I can't recall the exact power per degree, I was focused on getting the new meth system going. I'll get back to you after I get back on the dyno. Cheers. 

[GTSBoy]

What's the static CR with the capacity bump?