My supercharger went bad. :(
Originally Posted by sentry65
there's another vortech guy who's running the 2.75 EVO TT exhaust and didn't seem to have issues though with losing power or losing so much backpressure that it lost power. Though I don't remember what other breathing mods he has
the 2.75 exhaust was developed mainly for turbo setups that need a really open exhaust since the air has to pass through the turbos on the way out. IMO I wouldn't consider a dual 2.75 exhaust until you start getting around a 550whp supercharger setup.
as exhausts get more free flowing, your low end torque takes a bigger and bigger hit, so to me it's about finding an optimal amount of flow throughout all the rpms for your power output - IMO the same idea applies to being NA too, where too big will make you lose power
the 2.75 exhaust was developed mainly for turbo setups that need a really open exhaust since the air has to pass through the turbos on the way out. IMO I wouldn't consider a dual 2.75 exhaust until you start getting around a 550whp supercharger setup.
as exhausts get more free flowing, your low end torque takes a bigger and bigger hit, so to me it's about finding an optimal amount of flow throughout all the rpms for your power output - IMO the same idea applies to being NA too, where too big will make you lose power
Originally Posted by sentry65
there's another vortech guy who's running the 2.75 EVO TT exhaust and didn't seem to have issues though with losing power or losing so much backpressure that it lost power. Though I don't remember what other breathing mods he has
the 2.75 exhaust was developed mainly for turbo setups that need a really open exhaust since the air has to pass through the turbos on the way out. IMO I wouldn't consider a dual 2.75 exhaust until you start getting around a 550whp supercharger setup.
as exhausts get more free flowing, your low end torque takes a bigger and bigger hit, so to me it's about finding an optimal amount of flow throughout all the rpms for your power output - IMO the same idea applies to being NA too, where too big will make you lose power
the 2.75 exhaust was developed mainly for turbo setups that need a really open exhaust since the air has to pass through the turbos on the way out. IMO I wouldn't consider a dual 2.75 exhaust until you start getting around a 550whp supercharger setup.
as exhausts get more free flowing, your low end torque takes a bigger and bigger hit, so to me it's about finding an optimal amount of flow throughout all the rpms for your power output - IMO the same idea applies to being NA too, where too big will make you lose power
Originally Posted by Hexxum001
That's not how it was explained to me by Sam @ GTM. I was at 384whp at 10+psi with the HKS exhaust prior to it going back to GTM this second time around. Added to the mix was a plenum spacer, Fast Intentions HFC's, Aquamist meth/water system and the GReddy Evo TT exhaust. The goal was to get approx 420whp but the car wouldn't boost passed 7psi. The combination of the spacer, cats and Aquamist should have easily gotten me over 400whp. But because it wouldn't boost passed 7psi, the whp figure never got passed 400whp. There wasn't enough back pressure because of the GReddy exhaust to help build the boost. And contrary to what you are saying, the Aquamist kit does help make power. Cooler intake temp is going to equal an increase in power. Add a spacer and HFC's and there is no reason why I shouldn't have seen the #'s that we wanted. Sam checked all of the piping and even changed the belt. Everything checked out perfect. There's no other explanation for going from 10+psi to 7psi. It's my bad for not consulting him prior to changing the exhaust thinking that the 2.75 inch piping would help. Once I put the HKS back on and Sam throws it up on the dyno again, I'm very confident that we will see the boost and power #'s come up.
Originally Posted by booger
If you are still running cats . I dont think running a 2.75 exhaust is going to make that big of a diff . If you had 10psi and put the exhaust on with a spacer . But still have the same cats on . I wouldnt think you would lose 3psi . I gained 1.5 putting cats back on , from having no cats . If you have cats on , that will always be your bottle neck . I would look else were for the reason for the psi lose .
I would think since you do not have headers, running cats and the Greddy TT should net you an overall flow about the same as me. And aren't you on the 2.87 pulley? I am hitting 9.5 with my 3.12. It seems as though you may have a boost leak buddy
. You should have Sam do a boost leak test to make sure.
The thing is, Sam already checked every other possibility. He checked for leaks and even changed the belt. Everything else checked out fine. You have to remember, HKS is only 2.25 inch piping and the GReddy Evo TT is 2.75 inch piping and specifically designed for a turbocharged vehicle therefore minimizing back pressure. I appreciate everyone's input but Sam has done all of the work on my car so I think he has better insite to what the issue is than anyone else. We'll see though. I'll keep everyone updated as to what happens as soon as I switch exhaust.
If wat u said is true, why not just got with the bigger cog pulley (34 teeth) and go back with the 3.12 pulley. With that setup u should get about 3 more extra psi and prevent slips and get u right around 10-12psi.
Wow, Still hopeing everything turns out alright, Hex.
We installed and tuned a Vortech last month, and also did a tune on a different Vortech car a week ago that added headers, the HKS exhaust, and a 3.12 pulley. Sory you are having all the issues.
We installed and tuned a Vortech last month, and also did a tune on a different Vortech car a week ago that added headers, the HKS exhaust, and a 3.12 pulley. Sory you are having all the issues.
Thanks Scott. Mechanically, the car is running great. The clutch is still a little bit tough but getting better everyday. I'm still breaking it in. It's just the boost issue that needs to be addressed here. I should be making the swap back to HKS pretty soon. So we will see.
Sam this...Sam that...maybe he is not GOD like everyone is saying. Don't mean to be an azz Hex, nothing against you, but seems like you are wasting a lot of money. I just hope you get it right. It sucks when you have a car that is in the shop more than it is on the streets. Let's get this bad boy back on the road!!!
I have heard at least 3 horror stories from others who have taken their car to GTM and were toyed with and forced to spend A LOT more than they should have to get the job done...not to mention the down time. They are not members on the forum and this is probably why it hasn't been publicized. I'm just tired of un-trustworthy shops taking advantage of people! This just happens to be the thread that I take my frustations out on....This is probably not the case in your situation but this is my opportunity to let out on them.
I still have to figure out a way to get to RA to get my Vortech "touched up." I still haven't even tuned the effer!
I have heard at least 3 horror stories from others who have taken their car to GTM and were toyed with and forced to spend A LOT more than they should have to get the job done...not to mention the down time. They are not members on the forum and this is probably why it hasn't been publicized. I'm just tired of un-trustworthy shops taking advantage of people! This just happens to be the thread that I take my frustations out on....This is probably not the case in your situation but this is my opportunity to let out on them.
I still have to figure out a way to get to RA to get my Vortech "touched up." I still haven't even tuned the effer!
Last edited by Sundeviljay; Oct 28, 2007 at 12:56 AM.
Originally Posted by Sundeviljay
Sam this...Sam that...maybe he is not GOD like everyone is saying. Don't mean to be an azz Hex, nothing against you, but seems like you are wasting a lot of money. I just hope you get it right. It sucks when you have a car that is in the shop more than it is on the streets. Let's get this bad boy back on the road!!!
I have heard at least 3 horror stories from others who have taken their car to GTM and were toyed with and forced to spend A LOT more than they should have to get the job done...not to mention the down time. They are not members on the forum and this is probably why it hasn't been publicized. I'm just tired of un-trustworthy shops taking advantage of people! This just happens to be the thread that I take my frustations out on....This is probably not the case in your situation but this is my opportunity to let out on them.
I still have to figure out a way to get to RA to get my Vortech "touched up." I still haven't even tuned the effer!
I have heard at least 3 horror stories from others who have taken their car to GTM and were toyed with and forced to spend A LOT more than they should have to get the job done...not to mention the down time. They are not members on the forum and this is probably why it hasn't been publicized. I'm just tired of un-trustworthy shops taking advantage of people! This just happens to be the thread that I take my frustations out on....This is probably not the case in your situation but this is my opportunity to let out on them.
I still have to figure out a way to get to RA to get my Vortech "touched up." I still haven't even tuned the effer!
I am taking no sides on this as I did have 90% of my work done at GTM, just want to hear more on the statement you made.
I'd rather not...this was not meant to stir up any trouble. VRT is the one that has got me all pissed...not GTM
There have been too many happy people at GTM. The only thing I don't like about them is the high prices and long down time.
-OUT
There have been too many happy people at GTM. The only thing I don't like about them is the high prices and long down time.
-OUT
Joined: Feb 2006
Posts: 13,068
Likes: 101
From: Southern Cali --> 818
Originally Posted by Sundeviljay
Sam this...Sam that...maybe he is not GOD like everyone is saying. Don't mean to be an azz Hex, nothing against you, but seems like you are wasting a lot of money. I just hope you get it right. It sucks when you have a car that is in the shop more than it is on the streets. Let's get this bad boy back on the road!!!
I have heard at least 3 horror stories from others who have taken their car to GTM and were toyed with and forced to spend A LOT more than they should have to get the job done...not to mention the down time. They are not members on the forum and this is probably why it hasn't been publicized. I'm just tired of un-trustworthy shops taking advantage of people! This just happens to be the thread that I take my frustations out on....This is probably not the case in your situation but this is my opportunity to let out on them.
I still have to figure out a way to get to RA to get my Vortech "touched up." I still haven't even tuned the effer!
I have heard at least 3 horror stories from others who have taken their car to GTM and were toyed with and forced to spend A LOT more than they should have to get the job done...not to mention the down time. They are not members on the forum and this is probably why it hasn't been publicized. I'm just tired of un-trustworthy shops taking advantage of people! This just happens to be the thread that I take my frustations out on....This is probably not the case in your situation but this is my opportunity to let out on them.
I still have to figure out a way to get to RA to get my Vortech "touched up." I still haven't even tuned the effer!
I know GTM costs an arm and a leg, but I would give them alot of confidence & feel comfortable with them working on my car.
Hex, I hope you're back on the street asap! I know they're doing a great job on your car. But I can't help but to wonder all of those expenses
.