As promised, here are the results from today dyno run. The wastegate spring owns me. As you can see the boost falls off hard after 5500rpm for some reason. The waste gate is a Tial MV-S 38mm with a .6bar spring. My Haltech data log shows a max boost of 7.9psi, so I don't know. The dyno MAP sensor and haltech were hooked up at the same place. My manual boost gauge was dead on with what the dyno MAP sensor was telling us.

A/F ratios were logged as well, but my waste gate routing in to the down pipe was blowing right on to the dyno O2 sensor so we were getting some wacky reading, with the gate opening and closing. We thought those a/f ratios were useless and went off of the dual widebands on the Haltech. Hey were within .2 points of each other, so I know they were reading correctly. A/F ratios were in the mid 11's all the way through. Timing was 12deg at lowest (4500rpm) going to 16deg around 6500rpm.


When looking at this I am a bit disappointed because the loss of boost, but at the same time happy with the power at the boost level I did get. Also, keep in mind that this is a JB turbo, and it does spool a bit slower than a BB would. Not sure how much but I know it does.

I have the boost controller hooked up through Haltech, but the hoses were all disconnected and I just didn't feel like messing around with that while the car was strapped down.

One more very important thing to note. No boost spike with the 38mm gate, I know some were asking about it. Clearly the 38mm w/g does the job well.

So 358whp at 5.8psi and 343wtq at 6.5psi





VIDEO:


http://www.youtube.com/watch?v=9dyXXbS0oSo

 

pretty good i must say any vids of the run

 

i was def. expecting more...glad to see an improvement though

 

Yes they are on a friends camera though, will post as soon as uploaded.


I would say that is good, considering the boost drop on the top. Opinions are welcome though, good or bad.

 

Where are you sourcing boost pressure for your wastegate? From the pics in the other thread it looks like you are getting it off of the compressor housing. There was a discussion about this in the STS thread, and I ended up sourcing it from just before the throttle body. I know the STS has longer charge pipe routing, but I think you can see some pretty big pressure differences between the compressor housing and the charge pipe just before the throttle body.

Anyways, that could be why you think you are boosting less than you expected. However, I would rather source it from the compressor (shorter, cleaner vacuum line, less chance for kinks), possibly up the wastegate spring pressure, and get a good boost controller hooked up to keep the boost all of the way through.

 

Correct, the wastegate boost source is at the compressor. I have the Haltech set up to control boost, but the hoses were not hooked up since I changed the wastegate. I though that the spring should at least hold steady, guess not.

 

Now this is progress. Forget the numbers for now. You did an outstanding job with this kit. All that is left to do is hook up the wastegate properly and allow the haltech to control it and replace Turbo with Turbo you intended.
Done...and of course...Re-Dyno. That's when we are going to see what this kit is made of.
Again, this is a success!!! Keep on it BP!!!

 

compared to a TN kit at 7 psi

https://my350z.com/forum/shop-builds...une-setup.html

 

either way great numbers.. just gotta get the pressure issue sorted out and then it should shine! great job!

 

were your making max power you're only boosting 5 psi. hook up the haltec to controll the boost and it will hold steady as a rock, i bet more power could be pulled from this same psi.

 

That's the thing, people look at the max power and not the fact that it was 358whp at only 5.8psi (at max HP). I am confident that if the boost held all the way through at 8psi, the car would make 400whp.

 

i agree. great numbers especially for the boost dropping off. Is this through the megan catback?

 

does the boost curve do the same thing on the street? what gear did you run?

are you just running a single line from the compressor to the side port of the MVS with the top port open?

 

Charles, I could not open it up on the street at all. It's winter here, the white stuff is melting so the roads are very slick.

All my dyno runs were done in 4th gear. And yes, single line from the compressor to the side port, with the top vented to atmosphere.

It is a Megan knock off. Same thing, it's 3" diameter.

 

Sasha, do you have a 6mt? shouldnt manuals be dynoed in 5th gear?

 

Yes it is a 6spd. I am not sure about 5th gear, could be... my FD is 3.3 though.

 

5th gear being close to 1:1 ratio.. i dont know how it works with 3.3 though.. somebody else can comment on that

 

So I emailed Tial regading the boost drop and this is what he had to say:

the VQ engine has a pretty high VE, and a 6162 is actually on the small side for that size engine, the .81A/R housing is too small, you should see if you can get a 1.06 or step it up to a T4 flanged housing.

i'm thinking it's a backpressure issue...is that .81A/R housing the ford 5 bolt style?

Precision 6162 too small...?

 

Looks good Sasha. I have a feeling this is going to be a great kit and is going to surprise many, when all is worked out. Keep up the good work

 

What exhaust did you use for dyno?