Dyno graph

[Slowxr6t]

I'm getting boost surge in 4th gear, it surges from 15-17psi, and back and forth. Is it something that the tuner should be able to fix with the stock boost control? I have a 14psi spring in my new ts 45mm ewg. You can see on the power curve the drop when it surges. Also here's a pic of my homemade cold air intake for my turbo side intake. I found a 45degree 4inch pvc bend and got to work heating it up and shaping it while wearing welding gloves. Glued it to rubber hose and 3inch pvc pipe pokes thru into airbox, I holesawed a hole in side panel of airbox. Worked out not bad for a dairy farmer.

[Puffwagon]

Ah that makes sense now, I misunderstood you the other day, I thought you meant boost creep when you actually said surge. Meh you get that sometimes.

 

So yes that can be fixed in the tune quite easily. It likely just needs a little bit more duty in the wgdc table where it's surging.

[Slowxr6t]

Ok cool thanks, is that a good power curve for gt3582r? Do you like my intake?

 

@Puffwagon, @JETURBO, @k31thwhat do you guys think of my dyno graph? Above

[Puffwagon]

It's got some good power there. I'm seeing they started the run at 3100rpm which is quite high for that size turbo, you can see that it is already at full boost. Considering that the boost control is surging up top, I wonder if they had issues dialing it in down low as well?

At any rate it's only a minor adjustment to fix it and as is, it should have no worries ripping a fat skid from one servo to the next!

 

Interesting take on the intake, I wonder how much it affects pre turbo iat's? Does it add any other sounds to it?

[Slowxr6t]

@Puffwagon Induction noise is pretty loud, I didn't drive car without my custom intake so don't know if it sounds different. I just wanted to feed it some extra air when I installed turboside. It does dose hard out now and it never used to. I'm installing a Greddy type r 50mm bov and can't decide whether to stick it on throttle body elbow or compressor outlet ic pipe pre ic. There's lots of opinions out there like 1 dump the hot air pre ic, 2 put it close to turbo to protect turbo from surge, 3 put it near throttle because airflow is going that ways, 4 stick it wherever it suits for ease of packaging and vacuum line. What do you think Puff?

[Puffwagon]

I'd go for door number 3. If you put it at the turbo the air will have to reverse direction to escape.

[Slowxr6t]

@Puffwagon also I tried replumbing wastegate lines. From pressure source,  compressor outlet teed to bottom port wastegate and also into factory in port of boost solenoid then out port of solenoid to top port of wastegate and I can confirm it does not work. I read one of @k31ths posts from ages ago and he tried it too and did the same thing for me, boosted up fast, boost guage needle went nuts flickering around. I will go see tuna again to get boost surge sorted.

[k31th]

yeah, I learnt my lesson with that... you only plumb the top if you've got a positive pressure source which helps to keep the wastegate closed (good aftermarket boost controllers do this). The bottom one is for standard control.

[Slowxr6t]

I have a Mac 3 port solenoid, can this be used and wired in instead of stock solenoid and plumbed in the aforementioned way to keep wastegate closed for longer? Or do you need a complete aftermarket electronic boost controller?

[k31th]

well it also needs to remove the pressure when you get to the relevant desired wastegate pressure (so that it opens instead of overboosting), so it needs to be aligned with your desired tune parameters.