T25 and Meth

[knochgoon24]

My experience with pushing the T25:

I ran 15psi peak out of for about 9 months. Eventually, I decided to push it and really see what I could get out of it.

Without anything but an SAFCII to tune, I ended up just setting the MBC to 17psi. I took it to the 1/8 mile drags one day and just beat the hell out of it. This was one of the first times I've ran the car up to the redline. It was great off the line, but NOTHING up top. I think it held about 10psi at 7k RPM.

I must have done about 10 runs when I noticed that it wasn't brake boosting as well. I just kept running it. Eventually, I noticed I was only holding 5psi up top. Cars that I had crushed earlier in the day now had a fighting chance.

I probably put about 20 runs on it in a 3 1/2 hr time (only 12 cars at the track). As I pulled off the track, I heard this nice scraping sound. I pulled into a parking spot and popped the hood. It was coming from the turbo. I sat and brake boosted it in the parking lot and it just sounded nasty. I limped it the 53 miles home. It wasn't building boost until 3300 RPM.

It's now sitting in my closet. Every once in a while, I get it out to show people so they can laugh at how small it is, and at just how bad the shaft play is. One day I may tear it apart to see what's left of the bearings.

Moral of the story. The T25 turbos hate being beat on. Just put it on and keep the boost at a reasonable level. Anytime you miss the performance, just think of your new turbo you'll be getting.

 

[Moparbishi]

Im just curious why you wish to go with the fp3065? A much cheaper alternative would be a bullseye power turbo, perhaps a s256, you will save some doh, and be just as happy or happier.

Cause I would like a quick spook turbo that packs a good punch up top. Also I dont want that wastegate to be vented to the atmoshpere. And I dont want to hack my apexi downpipe. I want everything to be bolt on.

And for the T25, I gave in and picked up a 14b for 40 bucks. I should be happier with that, plus I can use my j-pipe off the 16g.

 

[UofACATS]

Why would you choose straight water over meth and water? I would think you would want some meth to help cool the charge even more so that it stays dense. I thought Thats what helps the turbo move more air. I really don't know much about this, so please fill me in!

First, I'm not an expert, I'm learning as I go. That's why I'm here.

I would choose water over meth because we're talking about pre-turbo injection. For post-turbo injection, I recommend meth over water. I don't pretend to understand the reasons behind the benefits of "wet injection" when applied to a turbo that is undersized and overworked, I just put together the pieces from what I gather, and what I gather is that it provides tremendous benefit given specific parameters. The benefits to the different properties of meth vs water have been discussed at length, but essentially the slower absorbing but higher capacity of water is more beneficial pre-compressor, while meth is the opposite. Instead of me copying and pasting some blocks of others work, just read through this: Waterinjection :: View topic - Injecting prior to turbo comp' impellers

Both have merit, but individual setups need to be examined before one is applied over the other. An example of this would be, IMO, a pre-turbo WI system would prove more beneficial on a T25 car running the FP17psi actuator, than a post-turbo meth injection system. Now, another example, IMO, a post-turbo meth injection system would prove more beneficial on a FP3052 car than would pre-turbo WI. One has great effeciency and is very capable of providing the 2.0L of the airflow it wants, while the other is the opposite.


To be blunt, a site specifically tailored to water injection would provide a wider range of results, but this site provides DSM specific results. Spend time at both. I have an experiment planned using the T25, pre-turbo water injection, E85, TB meth injection, and no intercooler. I'll start a thread and post the ECMLink logs when I have them.