How about 35-45ft-lbs? Let me know when you test this. As far as I can estimate, this should be close. The torque curve on the dyno sheet is (or should be) self explanatory.

 

I'll perform some testing two weeks from today, and I'll post a thorough report. It'll be done with a 20G-9, but I suspect the trends should be similar.

 

The graph shows exactly what it should, you are partly correct TTP. The high boost spike of 34 psi at low RPM's is fine and will increase torque greatly. What Ted's point was is trying to hold that 34 psi out to 8,000 rpm does not have the same effect, making him correct too.

I can see from the datalog you posted that the boost falls off quite a bit. Hard to tell how much though from your log.

You will also notice that the car you posted the graph from looses 200 ft lbs of torque from 4500 to 7500. That HP curve looks nice though. How much boost did that car have at 7500 rpm?

David Buschur
www.buschurracing.com

 

Well it pretty much a moot point as you cannot force a turbo to hold boost with a high V/E motor at high RPM. You can help it a little with a stiff WGA and either pull the WG line or run your boost controller at 100% duty cycle. After full tilt, it is gonna give you all it has and if your V/E is too great, its going to suck it dry early on. My point was that 34psi was off the map and still made good tq (outside of efficiency range).

If Dave did not try to get the same out of his turbo, there would be no need for his 26psi minimum actuator he was using.

Much like your shop, we lost a computer also. Our laptop. That log is from Oct 2005. We replaced the computer about Nov 12. From memory I think it ended up tapering to 22-24psi.

If the discussion is over running 30-34psi at 8000rpms, then there is nothing to talk about. I think Ted's point was outside of the efficiency range, there is no point in running it there and no returns but premature wear. My point was to say "look, here is more power and tq".

An important aspect to look at is to hold higher psi in the upper rpms, you need that boost spike to carry you over so they basically come together in a package, not one without the other.

 

I actually made that post, we had another computer crash here so Jarrod and I are sharing mine. He's big guy, makes my legs fall asleep if he sits on my lap too long! haha

Anyway TTP, I got the opposite from Ted's post, maybe he can chime back in on what he meant.

Making 34 psi at 3,000 rpm doesn't necessarily put the turbo out of it's efficiency range but the same turbo trying to make that much boost at 8,000 rpm will. The engine doesn't consume as much air at 3,000 rpm as it does at 8,000 obviously, atleast in most cases.

Also don't agree on your boost theory. Using the right boost controller you could set up the turbo to hold a flat high boost level from 3,000 rpm to 7,000 rpm with no spike in the boost pressure at all. I have logs if you'd like to see them.

David Buschur
www.buschurracing.com

 

We both have experience with 280's. The notion of trying to get a 16g to "make that much boost" (34psi) is not physically remotely possible even with the WG welded shut and those cams.

I would like to see the logs and find out what boost controller you are referring to. I would be surprised to find you run 23-24psi peak and 23-24psi @ 8000rpms with 280s.

I can see if I can find my logs also.

 

Not to hijack this discussion, but are there any numbers yet for 20G-9 on 91 or 93 with only the "common mods" (TBE,Cams,Flash/ECU,LICP)? I tried a search with no luck.

 

+2

 

 

Make that +3

Im looking for something as most us out here in CA are to make decent power on our 91 I will be getting the WORKS water injection kit when it comes out so I might run water/meth once in a while, but most of the time would be on water with 91 octane. With my mods and a 20G and water injection, I would be happy with 375-400 whp if thats possible

 

+4

 

+4

 

Why do you guys keep bumping this for 20g numbers on a mildly modded car? Why would you want to put this on a mildly modded car when there are less expensive ways to add just as much power? Buschur has already posted that it would be "silly" to put a 20G on a car with less than Stage 4 mods.

 

Mildly modified to some means I/TBE/cams/supporting mods/tune- just a difference in vernacular.

 

See what was posted above. With the exception of a new FMIC what we are talking about IS a stage 4.