I installed my PERRIN MBC and did the Wastegate Mod last Saturday. Thought I would write a little review.
Here's the fix to your boost taper problem. http://bellsouthpwp.net/j/r/jrude/wa...ctuatorDIY.pdf (http://bellsouthpwp.net/j/r/jrude/wastegateactuatorDIY.pdf) <-Wastegate Mod

Both the mod and MBC install took me like 90 minutes, and I took my time. I did remove the top track bar for more room. The "How to" on this forum on installing the MBC was VERY HELPFUL!

Before 2 mods:
My boost would spike around 21.5 lbs then taper to around 16 lbs

After both mods:
Boost spikes a hair under 25 and tapers down to 20! :rock:

This car responds better to bolt-ons than any car I have ever owned. The car pulls so hard now in every gear that my wife says it takes the breath out of her chest! "Glad something still does"

I dont know what I want next, a new FMIC or a Turbo Back Exhaust. Which would you get?

I would do exhaust to help turbo spool faster. U might not get great gains hp wise, but turbo would hit about 200-300 earlier. My vote is turbo back from perrin.

I would go for the turbo back exhaust also....
I have a question what does it change the thing with the wastegate????

I would go for the turbo back exhaust also....
I have a question what does it change the thing with the wastegate????

If you install a boost gauge, bone stock you will see boost spike about at around 21 then taper down to about 15 at red-line. This mod is to lower that taper down effect. I would not suggest it unless you have a boost gauge to monitor your levels.

I would go for the turbo back exhaust also....
I have a question what does it change the thing with the wastegate????

It helps a lot with the boost taper at higher rpms.

Do the TBE before the FMIC. Trust me on that one.

+1 on your mods.

i thought that after the mbc was installed it minimized the taper effect?

Actually, you bring up a good question joey. The mbc does minimize the taper. Why is the WGA mod needed in conjunction with a boost controller? I see the benefits to doing it on cars without mbc's, but not on cars with mbc's. All the WGA mod does is require more pressure to activate it. The mbc works by "fooling" the WGA, so what is the difference if the wga "sees" more boost at a higher preload tension, or less boost with a lower preload tension? In other words, turn the mbc higher slightly without the WGA mod, and lower slightly with the WGA mod. Same results, I would assume. Anyone else?

Unless the factory preload on the WGA is not sufficient and leaks at higher boost...

he is also saying that it tapers from 25 to 20. ive heard others say that they have thiers set at 24 and it tapers to 21. i think that i like that better

he is also saying that it tapers from 25 to 20. ive heard others say that they have thiers set at 24 and it tapers to 21. i think that i like that better

Is one Psi that much different. That could just be difference in condtions or type of boost gauge you had.

is one tenth of a sec. in the 1/4 that much diff? just saying

is one tenth of a sec. in the 1/4 that much diff? just saying
Im just saying that 1 psi can be the difference in the conditions at that particular time or the boost gauge. It going to be hard to differentiate between 1 psi, and quarter mile times are not that important to me if it was Id have a big V8 and throw a super charger on it to make 700 plus hp for cheap.

Im just saying that 1 psi can be the difference in the conditions at that particular time or the boost gauge. It going to be hard to differentiate between 1 psi, and quarter mile times are not that important to me if it was Id have a big V8 and throw a super charger on it to make 700 plus hp for cheap.

:+1: I agree, but to be honest I will get very psi, hp, and 10th I can get in what ever I'm driving

If I can get a video camera, I will do a pull on the highway with this mod.
Im boosting 26~27psi and holding.

If I can get a video camera, I will do a pull on the highway with this mod.
Im boosting 26~27psi and holding.

I thought fuel cut was around 26 psi Talon? Thats exciting though! I wanna see that vid!

I thought fuel cut was around 26 psi Talon? Thats exciting though! I wanna see that vid!
Im ECUTek tuned.

Im ECUTek tuned.

LOL just saw that- lucky bastard! That will be in my future im sure.

me too. im just waiting on a safe map for the intake

The shop that did my tune, has a shop EVO X.
The tuner pulled 40whp/40wtq out of it without any mods.

bone stock huh? where you located man

bone stock huh? where you located man
Edmonton Alberta, Canada.

i see you have alot done to your ride man. im pretty sure that with all that you didnt dyno at 318. whats your numbers look like

i see you have alot done to your ride man. im pretty sure that with all that you didnt dyno at 318. whats your numbers look like
My hp is low, the problem we had was the boost taper.
I unfortunately didnt have my MBC with me when we did the tune.

Im going back soon, and aiming for 400whp.
With a few new toys...

good luck man! thats the number that i will hit after i get back from Afghanistan. maybe even more

good luck man! thats the number that i will hit after i get back from Afghanistan. maybe even more
Thanks, If my boost gauge is correct, Im holding 10 more psi, then I was @ the time of my tune. That could make up the difference alone.

what was the boost at the tune

what was the boost at the tune
26.5 tapering to 16

WOW. thats a big taper. so is it holding now at 26?

WOW. thats a big taper. so is it holding now at 26?
yup :shades:

i bet it hauls balls.

i bet it hauls balls.
It does ok.:bowlol:

let me know what your at when you get it tuned again would ya

quick question...the guys that are boosting 21+psi, when ur turbo is spooling and reaching max boost does it like its whistling? for example vroom swooosh weeeeee.

Yes, I love the scream of a turbo

just add an intake and you can hear it whistle

I still want to know Talon what you did differently to that allows you to hold 27-26 PSI to red line because everyone else still tapers a bit.

^^^^^^:+1:

vroom swooosh weeeeee.

You just won this thread.

So I played with my MBC last night. If I turn it down a half a notch my my boost spikes at 24 and tapers to 21, if I go a half notch up it spikes at 25 but tapers to 20. Which one is better?

So I played with my MBC last night. If I turn it down a half a notch my my boost spikes at 24 and tapers to 21, if I go a half notch up it spikes at 25 but tapers to 20. Which one is better?

I would think it would feel much smoother if the boost tapered off less. Plus you would have a little more up top, which is where this car needs it I think. But I dont know anything this just seems to make sence.

i agree

Talon, spill the beans. What did you do to hold constant boost to red line like that? Plus, you are running a tune, MBC, and you did the wastegate mod? man that sounds dangerous.

I have spiked nearly 28psi before but quickly stepping on the gas and spooling the turbo but still tapers to 15-16psi. It averages about 21-22psi. I thought it might be a happy boost gauge but I don't know. I am iffy about the mod because of the crazy spikes I have hit sometimes.

you did the wastegate mod also huh? no MBC? ill be putting mine on this weekend but im not messing with the wastegate

Talon, spill the beans. What did you do to hold constant boost to red line like that? Plus, you are running a tune, MBC, and you did the wastegate mod? man that sounds dangerous.

I have spiked nearly 28psi before but quickly stepping on the gas and spooling the turbo but still tapers to 15-16psi. It averages about 21-22psi. I thought it might be a happy boost gauge but I don't know. I am iffy about the mod because of the crazy spikes I have hit sometimes.

you have no MBC and spiked at 28??? sounds like a very happy gauge to me. Watsegate mod should only help taper, should not effect max boost output.

Talon, spill the beans. What did you do to hold constant boost to red line like that? Plus, you are running a tune, MBC, and you did the wastegate mod? man that sounds dangerous.

I have spiked nearly 28psi before but quickly stepping on the gas and spooling the turbo but still tapers to 15-16psi. It averages about 21-22psi. I thought it might be a happy boost gauge but I don't know. I am iffy about the mod because of the crazy spikes I have hit sometimes.

One day I'll spill the beans.

my AFR is fine all the way to redline.

you have no MBC and spiked at 28??? sounds like a very happy gauge to me. Watsegate mod should only help taper, should not effect max boost output.
hes been tuned

One day I'll spill the beans.

my AFR is fine all the way to redline.
cmon man let us know

IMO sounds like a tune to lean out the car.

Evox are you running 91oct with your mbc set at 24. Im just curious cause the tuners say they only want to keep factory level boost of 22 if you are running the shitty gas here in oklahoma. I know of one place in tulsa and one place in OKC to get 93 or higher oct. I was just wondering if you where having anyproblem running 91 with higher boost?

Evox are you running 91oct with your mbc set at 24. Im just curious cause the tuners say they only want to keep factory level boost of 22 if you are running the shitty gas here in oklahoma. I know of one place in tulsa and one place in OKC to get 93 or higher oct. I was just wondering if you where having anyproblem running 91 with higher boost?

No issues yet. I do use 91. There is a race shop by my house where you can get really high octanes by my house, but I never tried it. What types of issues are they reporting? I have turned down my MBC so that it maxes at 22 and falls to 21 for my day to day driving. Turning it up takes about 20 seconds when I want to play :rock:

No issues yet. I do use 91. There is a race shop by my house where you can get really high octanes by my house, but I never tried it. What types of issues are they reporting? I have turned down my MBC so that it maxes at 22 and falls to 21 for my day to day driving. Turning it up takes about 20 seconds when I want to play :rock:

Not sure if anyone has reported any issues yet, but from seeing thread and pms from AMS and Perrin it sound like they would be very hesitant to do more than stock boost. I would really like to have 23-24 and taper down to 19-20, but I dont know if anyone will do that on a mail in 91oct. There is a place here in Nichols Hills that has 101 oct and 93 oct. I try to get by there once a week to get some 101 to mix with the shitty 91, but i cant always get over there. I did fill it up completely with the 101 oct, and I swear it is the best the car has ever felt. Not sure about increased power, but it was silky smooth and I swear the engine was quieter. It was 6.75 a gallon though.

from what i was told, they map it for 92 and above only. also people have been boosting 24-25 for day to day and havnt reported any problems

One day I'll spill the beans.

my AFR is fine all the way to redline.
That doesn't help build the community. Everyone is posting How to's and tweaks so that we can all benefit. How is it that you can take a tweak that the community provided, build on it, and then not give back? I'd hate to say it but that is a pretty selfish thing to do Talon. The way I see it, I use what the community provides but I also give back when I can so that we all can benefit. Otherwise what is the point of a community?

That doesn't help build the community. Everyone is posting How to's and tweaks so that we can all benefit. How is it that you can take a tweak that the community provided, build on it, and then not give back? I'd hate to say it but that is a pretty selfish thing to do Talon. The way I see it, I use what the community provides but I also give back when I can so that we all can benefit. Otherwise what is the point of a community?

Communist Hippie! :jk::peace:

from what i was told, they map it for 92 and above only. also people have been boosting 24-25 for day to day and havnt reported any problems

I know, but I figure it can't hurt for day to day driving, and we do not yet know what the long term effects on maxing out this turbo is yet. When I want it or need it I just turn it up.

I know, but I figure it can't hurt for day to day driving, and we do not yet know what the long term effects on maxing out this turbo is yet. When I want it or need it I just turn it up.

+1, Just wondering how it was working cause Im about to do a tune and would really like to have boost up to 23-24. Im going to try to run higher gas most of the time. Let me know if you have any problems.

That doesn't help build the community. Everyone is posting How to's and tweaks so that we can all benefit. How is it that you can take a tweak that the community provided, build on it, and then not give back? I'd hate to say it but that is a pretty selfish thing to do Talon. The way I see it, I use what the community provides but I also give back when I can so that we all can benefit. Otherwise what is the point of a community?
I don't want to get blamed for breaking someone's car.

good enough for me but if we break our car that would be our own fault

Once Ive made sure its safe I will spill the beans,

cant argue with that

So the ? is still here... should you do the wastegate mod when you have an MBC?

So the ? is still here... should you do the wastegate mod when you have an MBC?
Yes

Is it going to help hold the boost better?

Is it going to help hold the boost better?
Worked for me

so is that how you held at 26??

so is that how you held at 26??
Part of it

ok then. so did you durn it all the way or just once or twice

ok then. so did you durn it all the way or just once or twice
3.5 turns

yeah, when i was reading the post on the other forum the guy said he could only get about 3.5 turns in. i guess ill do that tommorow

yeah, when i was reading the post on the other forum the guy said he could only get about 3.5 turns in. i guess ill do that tommorow
I tried for 4, but there was no way

So what is the long term effects of tightening the wastegate? is there gonna be wear super fast so that the wastegate has to be replaced????