Sorry to say but you are wrong. Car pulls harder everywhere, you must have not tried it there buddy. Car would fall flat on its face before it was tightened, it would fall to 14psi up top. Now it holds 19 no problem, would like to go to 21 but car is untuned.

 

Yep, tightening the wastegate does in fact improve taper, so Zwinger, you are wrong. However, I am not a fan of this because it can cause overboosting in low rpms. What can happen is that because the wastegate flapper has a reduced vent angle, it can cause the wastegate to not vent enough exhaust gas at peak boost thus causing spikes. The best way to go is by far getting a reflash because the peak and taper characteristics are the same as any MBC or wastegate upgrade and it's safer and more driveable, with full boost correction in the ecu to prevent spikes or erratic behavior.

A good rule of thumb is to see what kind of boost taper a reflash with the wastegate duty cycle mapping maxed out at high rpms nets and that's how you know the maximum efficiency of the turbo. Forcing the wastegate closed to hold more boost beyond that ( you're not there yet but if you tighten that wastegate anymore you will be) is only going to overspin/overheat the turbo and cause the turbo to blow overly hot air and heatsoak the intercooler. Then at that point you can't run as much timing because of the increased combustion temps/EGTs, and when compared to a setup/tune that stays within the efficiency range of the turbo, you'll break even at best and be a lot less efficient and more prone to detonation. Just a tip...

 

Tighten the wastegate alone without a boost controller does nothing i have dynos to prove it it was turned and tested in every rotation possible and it would onyl create a short boost spike at the start also created a small torque increase in that time then tapers back to normal as it did without being turned. With a boost controller yes it does help without which im trying to say doesnt help.

 

And I'm pretty sure you have a boost controller or a re-flash as without it you wouldn't hold 19 with just tighten of a wastegate. Maybe a forged wastegate could possibly hold that without a boost controller. You never said boost controller or forged wastegate in your mods so simply just a tighten wastegate isn't going to fool the ecu. You might feel faster as for that short burst you get when you floor it but thats just a spike that the ecu can't catch immediately.

 

Evo x in general a tighten wastegate , maybe older gen it could this ecu shows no gains in a tighten wastegate. Ill show you 2 dynos one with normal wastegate setting then 2 runs one with 2 turns/ and one with 3 turns side by side. Only a short boost spike same taper and actually took away awhp and added more torque for a split second.

 

Solid Line Is wastegate turned 2 turns back from max settings(4 turns max), dotted lines are factory settings. Same taper sorry so unless you have proof that simply a tighten wastegate held your turbo 19psi to redline without a boost controller or reflash, then your kinda hard to believe

 

Nice four posts in a row.

 

Talk to razorlab aka GSTmotorsports. Mine made more power I don't know what else to tell you and without a boost controller.

 

So the dyno before tighten then dyno after thats all you gotta do how can you claim any numbers without a dyno sheet? I don't need to prove your point, you do.

 

Here's a simple explanation for you ..

The wastegate control on the ECU goes by duty cycles based on a preset pre-load off the factory (variation +/- etc) ..

When you change the preload, while keeping the duty cycles on the wastegate control the same, you effectively reduces taper and increases overall boost ..

The only reason I can see when you compare an IX to a X is the X has a more precise boost control compared to the older evos (so far 3 3D maps vs 2D maps on the older Evos).. Do check CBRD's thread for the dyno before and after

 

CBRD dynos was based with a manual boost controller, i read it many times. This situation is based with no boost controller and only a tighten wastegate.

 

CBRD wins the least expensive power mod award...

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hee he

jk...

we decided to put our X on the dyno today...

with an mbc and simply tightened the WG actuator rod...

findings were interesting and impressive...

at 1 psi less than the last time we dynoed with the mbc set to 22... we made 40more whp, and the same wtq..... but the power band is broader up top...

peak boost is alot later, but the torque doesnt suffer really at all regardless...

so it was....

229whp/252wtq at 21.8 psi

now..

276whp/251wtq

cb

 

Its up to you .. I told you what the computer does .. so YES your boost does increase when you tighten the preload .. it's not alot but it does ..

With MBC you're only fooling the computer into looking at lower boost value.. it will not solve the taper issue .. you're just shifting the boostcurve upwards with an MBC ..

I don't have an MBC and I see an average taper at 7000rpms at 17psi versus before the preload at 13psi ..

 

Well put up a dyno sheet showing it if your claiming what you see on your boost gauge i wouldnt take that proof to far. This discussion is with no tune/flash no mbc only debating the tighten wastegate mod. He says more power/ i say not unless a mbc is in play/ I have proof, i have yet to see any proof from everybody else claiming this. No proof then dont claim anything til you do ...

 

Since you say boost gauge is unreliable, then I have no proof for you..
The wastegate preload all is about boost .. and since that is unreliable.. then I have nothing else to say ..