Is there a compressor map available for the stock VIII turbo (9.8 hotside) ?

 

well lets just say that i just had this debate at slowboy racing here in pa. i was getting my manifold and my turbine section ported and polished so i was asking since i have my turbo off the car should i get the forge actuator? and after some debate lets just say i still have the stocker on the car , benifits will be small , the actuator will still lose the battle against the exhaust pressure in the internal gate

 

that is a bit of a contradiction, how do u have an external and a internal wastgate setup

 

boomtown, you aren't the only one with boost issues. I have trouble holding boost all the way to redline too. I have had the stock 03 turbo and an 05 MR turbo in my car, with various boost controllers (including the Forge UNOS), but I can't seem to hold boost to redline. I can set my boost controller at 1.6 bar and although it will peak there, it won't hold it for long. It will drop to 1.4 bar quickly and slowly taper to 1.3 bar by redline. AND I have done a boost leak test, no leaks. I am beginning to think this is normal.

 

It's always been normal on my 05, and I don't seem to be lacking any power as you can see below. I think people who claim to maintain the same boost level all the way to redline either have boost gauges that are off, or they aren't able to watch the gauge the whole time due to driving complications. Mine routinely tapers to below 20psi right around 7k. It happens on the street, on the dyno, and at the track (in 4th through the traps).

 

i had that problem too, when i put on the forge wastegate actuator, the creep went from 1.5 all the way to 1.3 but now im getting 1.5 to 1.4 bar. it could just be due to my 280 cams, my buddy has 264/272's and he showed me his AEM datalog and it stays a solid 20 psi the whole way across.

 

Warrtalon - did you mean wastegate completely shut (which would be the absolute limit of the turbo airflow I guess).

Has anyone run the stock turbo with the wastegate wired shut to see what happens?

 

Yes. By "open," I just meant full, unrestricted boost.

 

Oh....he have Motec M800,3" Cat-back,MAP and only run 12.9@107.3MPF,what a nice mod and slow timw,hahaha.

 

I would love to hold even 19 psi at redline! Best I get is 1.3 bar which isn't even 19 psi. What can I do?

 

how about the Works flash? It's a bit expensive, but does it hold boost all the way to redline?

 

I got the works p2 flash and my boost holds 20psi to redline without tapering. It really helps when I am at the track. It's a bit pricey, but I dont need to worry about all the other crap like boost controllers etc. To me its well wort the price tag ask anyone else whose running the same flash and they will tell you the same thing.

 

on my car with a 9.8 hotside, my car holds 20.5 psi and tapers to 18.5 at 7500ish, with a halman boost controller and forge diverter valve

 

I run a rock steady 20.5 psi all the way to fuel cut thanks to a Turbo Smart E-Boost 2. It used to taper, but then I figured out how to program it to eliminate taper. I highly reccomend this unit.

 

So, is it unreasonable to expect a MBC to hold 21psi to redline in 1st and 2nd gears?