Thread: UN dyno day #s updated with video

Don't really want to read everyone elses posts here cause I already talked for quite awhile about these numbers with Andy. Your car is going to be a LOT faster on the street the way it is dynoing. You actually have torque!....the fact that your torque peaks and drops off instead of running flat indicates you are faster then last year, making more real power.


The reason why the torque drops off now, is actually because you have a bottleneck. head or cam is usually the cause of this unless you have something else seriously wrong.
I became very acquainted with this when someone building the 4 valve version of my motor set to max out the motor on stock heads and cams (but using ethanol to maximize results). I will look for one of his dynos and you can see the engine hitting a brick wall.This only happened when he turned the power up high enough to hit that brick wall in flow.

The fact that the turbo holds boost means the turbo is not maxed out. Slap a bigger spring in man!

Casey (dsm) just went 119mph at the 1/8th on a 62mm compressor wheel at utah 4400' altitude, dyno'd over 700whp on the jet. I think you can still hit 100+mph on that turbo and hit 130 traps.


Here is the dyno I am refering too. Your current setup must have something that is not jiving with the rest. He actually tried adding cams but since the headflow was maxed, the cams just made the turbos spool slower. That was a really interesting dyno which I don't want to look for but its quite true.
The only thing he was able to do was go to a higher % of ethanol and make more torque.

Here he is on E85. See the huge difference in spool and torque (aka he makes less), but no big HP loss? The only power difference in his dynos is caused by a slightly higher content of alky (more energy per pound of air) and probably a few tenths of a degree more timing since he has more cooling in the higher ethanol content fules.

I know what you are saying brent, but since I cannot push boost any higher, I don't really know where the efficiency is on this turbo. I don't think there is any other restriction, and don't believe there to be one. Unless it is one that noone else has. My setup is very well designed and it shows, but I just can't push any more boost from this turbo without something else failing. Like my MAF. I don't want to risk any more boost on the blow-thru maf because it will sooner or later explode, and i don't want little plastic pieces going through the engine.

The only real solution for me to make more power, is to get a higher flowing turbo to make more power per psi. The GT3076r has been good to me over the years I have used one, but the turbo wants way more boost than I can throw at it reliably.

The TS 1.06 housing is the biggest one I can get for the 60mm turbine, and that may be a restriction as well. It is basically like running the .63 undivided housing, perhaps a little bigger, but the open .82 housing would prob still beat it on peak power by 20whp or so.

The housing spools better than the .63 though, and the power made per psi is better still. I don't think this turbo will ever see 500whp though, not on the dynomite anyway. The dynojet reads a lot higher numbers so who really knows?

But I have a good setup, and there are no restrictions. I even ran open dp last year, and this run was with the exhaust on, but the air filter was off. I am running a better setup, a better intercooler, better and shorter pipes, a very good manifold and housing combo, and bigger cams. Yet on high boost the car still hits a wall. I don't think the JWT is the issue anymore because my timing looks decent for the airflow I am getting. Just looks choked up. More boost would get me there for sure, but at what price.

I am upgrading the transmission soon, but after that the new turbo is going on. I would love to get a GTX3582r, but it is taking its sweet time coming out. I may have to get the HTA82r since it seems to be better all-around than the regular GT35R. As long as I can get 500whp on 24psi I will be happy with that. Any more power on that boost level and it will be even better.