Oh, I'm not unhappy at all. The nice thing is that my brother and I only have room to grow with this car as we learn more. I initially expected to be driving a car of 330whp when we started this build and this is what it snowballed into. I am beyond pleased and am enjoying the fact that I actually own such a great car. Plus I'm about to start nursing school on a full scholarship with military benefits so I need to keep it a reliable car that's not too powerful. If something big breaks and is a major expense I won't be able to fix all that quick.

 

Good point, I never noticed what dyno it was on.

 

People say the same thing about Mustang dyno's vs Dynojets. This would mean that Mustangs and Dynopacks would read the same. With this taken into account your numbers are down about 25-40rwhp and the spool up is a 1000rpm higher then what we normally see with a GT35R at 15PSI.

Typical RWHP we see is between 400-435rwhp at 15PSI with full spool from 3500-3800 on the Mustang Dyno. Using the widely believed thought that dynojets read 10% higher, these same cars should be 440-480rwhp.

Here is a page of dyno sheets with several GT35R cars that we have tuned recently(including our own 35R powered Vert at the bottom) http://www.banzai-racing.com/dyno_gallery.htm

I do have to agree that it is not necessary to chase numbers if you are happy with your car, however from the tone, it sounds like you are slightly disappointed. Keeping in mind that your brother is not an experienced rotary tuner he is doing quite well. From the looks of your sheet it seems the map may be overly conservative in the lower RPMs causing the additional lag and drop in power.

 

Yeah, we haven't done any tweaking yet. My brother wants to do some street driving and pulls and look over the logs. I'm getting 13-14mpg so we're figuring some fuel needs to be pulled out in the lower RPM's, so I'm glad you said that. I want thank you guy's too, Banzai, I'm so happy with how great my engine runs. We're just taking our time with it. I'm not disappointed, I just want to know where we're at. Oh, I thought it seemed laggy compared to what I was expecting for this turbo. I was expecting a divided housing but this is undivided, that would also contribute right?

 

Our 435 rwhp Vert is on an undivided T4 .82 hotside w/3" v-band....

 

I have T4 1.06 hotside. I really like the dyno sheet for the 410whp silver FD. I need to get in touch with the guy that has the tuning notes again. We don't plan on going for numbers, especially this early in the game. I would like to improve response more than anything. To be honest, until I can upgrade suspension and wheels I don't think I want to drive it with more power. Although if we happen to straighten out some tuning and gain power I wouldn't mind making the same power at lower boost. I talked to a friend that's getting his dyno in soon and said we'll be able to get in some real affordable tuning time. So we'll see how that goes.

 

That hotside would cause a "little" more lag (100-300rpm) but you should have more top end power. Your graph should be much more linear, take a look at the ones on our site, the torque rises with the boost and the HP cuts the chart in half at nearly a 45 degree angle. Your HP and torque both start dropping off after 6500, that turbo should continue straight up. It is dropping off like the twins. It looks like the timing could also use a lot of tweaking in the higher rpms.

 

Take it to the dragstrip, see what mph it traps, if you trap around 120mph then you are making right around 400 rwhp which is pretty standard for that turbo and boost. Every dyno is different and dont let yourself get caught up in those numbers, the drag strip wont lie neither will racing a stock viper or z06, that should tell you where you are at in terms of hp.

 

Dynos may read different numbers, but the curves stay the same. The HP and torque should not drop off like yours do. This is either a map issue or the boost controller is allowing the pressure to drop off considerably. Your car has a LOT more to give. I don't care what it traps at the track in it's current state, it can be improved.

 

That's funny that you say that David, I was going to take it to the drag strip this morning with my fiances father. The weather is pretty shitty so I decided not to go today. Plus I'm real nervous about driving it down the strip, I've never done it before. Yeah, you're dyno sheets definitely look better than mine but it is what it is for now, as we learn it'll get better. My Dad has one of those GTech devices, I think might try that thing first.

I look forward to being able to make these improvements with my brother over time.

 

This is the best way right here. It doesnt matter what you make if you cant put it down.

 

HP and Torque will start falling off around 7k unless its a half or full bridge.

The graph looks like it is either going rich or there is a boost issue. Timing will have very little effect on torque falling off unless the timing is way off.

 

Did some of you people actually believe that he was running stock twins? Are you crazy. Non sequential or not they dont make any 375whp unless they are set to run an amount of boost that turns them into hand gernades. That is in my opinion a very "driveable" amount of power and fast enough to beat most things on the road. Get your low end tuned a little better and you should be very happy with how that thing drives. I have a 35r with a .82 or is it a .86? and it makes 390whp and is really damn fast. I hit 15psi by around 3500rpm. You have a fun car for sure.

 

It's probably that. He mentioned it was laggy.

 

Unfortunately all I have is that sheet and whatever my brother saved from the runs on the laptop using the datalogit. It does feel laggy and I went with this turbo in hopes of response not power. How would I be able to know definitively that the wastegate is not closing all the way? I'm starting to think that the hotside is larger than what I was actually looking for as well. I was under the impression that for a turbo of this size on this engine that the bigger hotside was the way to go. Live and learn I guess. The thing that I don't get and makes no sense to me is how my friend gets better response from a GT4088 on a K24 in an Integra? Granted, I haven't gone out in it as he's in the middle of switching from Handata to AEM and is waiting for his dyno to come in to start tuning it. But according to him he would be at about 1 bar by 3500RPM.

 

I see fantastic response out of my 500R, which has a larger compressor wheel than your setup but the same turbine wheel and a 1.0 A/R housing.

It's gear and temp dependent, but I'm seeing 15 psi by around 3500-3600 rpm on my new build.

 

I did forget to mention, I know this could be a factor, I do have an exhaust leak that I think is coming from the manifold at the engine. I got a remflex gasket but haven't got a chance to install it yet.

I'm sure your manifold helps, I have the megan manifold from rx7store.

 

I think you said you were running a MBC. Hook up the tru boost that you have an that will help your spool.

 

I ran the 1.06 GT35R for years on my FD, it is not the hotside making it as laggy as it is. I do prefer electronic boost controllers for easy of access, but there is nothing wrong with a MBC. Often times they give better response then an EBC as there is no solenoid to rely on. An exhuast leak can certainly effect spool and more importantly AFR's while tuning. However it would have to be a huge leak to slow the turbo as much as your graph is showing.

 

My Tru Boost is what I'm using now. The MBC was only used during tuning. Sad, it's supper easy to use but at the time we didn't know how to turn it back on. I am very curious as to why it has as much lag as it does now.

 

Here is one of our dyno's with the same turbo kit you have on a street port. This was 15.5 lbs of boost.

 

As reference to what gmonsen had pionted out, that sheet shows 150hp reached almost 1000RPM earlier then I do. Damn, 440whp at 15.5PSI. If that were my car I'd set that bitch to like 12PSI and have an *** load of fun.

 

440 on the Dynojet is the same as all the 400 rwhp charts we have on the Mustang Dyno as I explained in Post#29. Like I said the numbers may be different but the curve stays the same, ultra linear, HP clearly increases with rpm. Now look at your curve and you can see the lag and the rapid drop off.

Same boost, 1.06 gt35r, mustang dyno, same curve, this was without any boost controller, just running a 1 bar WG spring. The final runs cleaned up the bump up top

 

Just throw you car on a Dynojet and do a HP pull. Your graph is not linear so there is some sort of issue going on which is probably why you are getting more lag than usual.

 

My friend that has the turbo K swapped Integra should be getting his dyno, that he co-owns with another friend of ours, in within 2 weeks. I'll have to wait till then since they'll give me a much better deal than most. I don't want to touch the tune till then since it'll be a different dyno and it'll already be a different boost controller. It's a blast to drive as is so I can live with it. I just hope **** doesn't get all messed up with this whole co-owned dyno thing inadvertently screwing me.