So on my T04E 60 trim My "sweet spot" would be 2 bar right? How much boost is that in psi?

 

Somewhere around 29lbs., damn that's alot of boost.

I think I read somewhere that 1bar= 14.7 psi.

 

Here is my recommendation on jetting your setup. Remember this is only my recommendation from my experience. You do not need to take my advice I am just going to put it out there for you to consider.
I would use the following in your scenario:
Weber 40 IDF
160 Air Corrector Jet
F-3 Emulsion Tube
215-230 Main Fuel Jet
32mm Choke

This recipe should make roughly 400 RWHP with your turbo set to 12-14psi.

I have a part you might be interested in it is a rare 40 IDF top that has a Fuel Enrichment circuit built into the carb top. No gimmicks or BS I run these really old 40 IDF Weber tops on my own car. If your interested I can provide a picture to compare against what you have on your car.

Albert Mets

 

The picture would be cool.

I have not figured out how to remove/ install new venturis, otherwise I might try what you are talking about since I have a spare carb at home.

I also have a gross? jet that meters fuel and is connected to the float, do you know what I am talking about?

 

Hey Albert, you have my other email address right?

If not, here it is: neil@predatorcues.com

 

Though your conversion makes it work, the y-axis is thr pressure ratio through the compressor. Pout/Pin, so 2.00 is around 1 atm of pressure (14.7 psi of boost). 2.00 is NOT ~30 psi.

 

Man, I think my engine would fly apart at 20 something lbs. of boost.

 

No no no! You can't talk terms of efficiency by pressure alone -you have to know how much air is going through your engine. "How much psi is the sweet spot?" questions cannot be answered without knowing more.

To answer your question, if your engine flowed 26-32 lb/min of air at WOT at the hp peak, your sweet spot would be ~1 atm (14.7 psi).

 

How do you measure how much air your engine is taking in?

 

There's the rub. Since we don't have mass air meters, you would have to determine it some other way. I'm guessing here now but, if you know the BSFC and the hp, I think you can back out airflow. Same with air/fuel ratios -you can log the amount of fuel going in, look at the AFR, and back out an approximate air flow number. Anyone know for sure?

 

What's a BSFC?

 

Its Brake Specific Fuel Consumption. Hopefully Peter (RICERACING) will chime in -he knows all this stuff, or you could try a search on it.

 

Thank you for the info, I was just too lazy to search.

 

Okay, searched and read, now my head hurts.

 

You have a T04E 60-1, not a "60" trim...they are two different compressors.

The 60-1's sweet spot is at 1.7 bar (10 psi).

The "60" trim needs 2.4 bar to make what the 60-1 makes at 1.7

 

1.7 bar= 10psi?

 

psi + 14.7 / 14.7 = bar.

10 psi = 1.68 bar = 1.7 rounded up.

I read somewhere, that you are actually supposed to divide by 14.2 for some reason, but nobody does.

 

Wow, that's a new one.

Thanks for the info.

 

ok so should i be running 29psi or 10psi?

 

Well, you should be running the amount of boost required for the hp you want.

For the T04E 60-1, the sweetspot is 10psi. That should give you anywhere from 300-400 bhp depending on certain factors.

Nobody running 29 psi on a 60-1, lol. That puts you off the charts...

...no to mention that you'd need race gas and a standalone EMS.

 

Whoa, hold on now, you're going to confuse people going from guage to absolute pressure. 1.68 bar is around 10 psi if you're talking absolute pressure, but most people in the automotive world use guage pressure. This means that 0 on the boost guage is atmospheric pressure and not outer space pressure. 1.68 bar on a boost gauge and you'll be at 25 psi.

 

ohhhhhhh ok so 25psi on a boost gauge that's what i needed to know

 

No, he's was looking at the pressure ratio of 1.68 for your turbo. P2c/P1c = 1.68 this is ~1.68 x ambient pressure = 24 psi. Now you have to subract the ambient to get the guage so: 24-14 = 10 psi on your boost guage -assuming your engine takes in the corresponding amount of air of the compressor map.

 

Yeah, thanks for clearing up the confusion. I was just relating my info to compressor maps

 

so confusing