JDM EVO 6

all other gears 21-23 psi

what wga can I buy for a stock evo 8 turbo?

Or what home made solution?

awdordie

iTrader: (1)

I would highly suggest not too be hitting boost in 5th gear unless your at the top of fourth. If your boosting it from a low rpm in 5th thats the fastest way to install a window in your block.

Dont know of any home remedies, and wouldnt suggest to "rig" an evo... dont be a ricer.

Also are you wanting to boost higher in fifth as the title implies since it says only boost 26 psi in fifth? Or are you wondering why its boosting higher than 22-23 like other gears?

sparky

iTrader: (1)

I think that I know what the OP is trying to convey. If I am understanding what he is saying; the turbo only reaches his desired peak boost level (26#) in top gear. In gears 1-4 boost does not reach the desired peak level but instead peaks at 22-23#(or whatever). Is this the case?

sparky

iTrader: (1)

OP: Most people here are gonna tell you to do a boost leak test, right off the bat. That's sound advise in these cases....so do the BLT ASAP.

Tell me how you are controlling boost on that turbo? What sort of BOV is fitted to the beast? Do you have any idea whether your stock VIII turbo(I assume) is configured with the 9.8cm housing, or if a 10.5 cm housing was installed?

Can you list ALL of the pertinent power mods on your ride please.....

sparky

iTrader: (1)

BTW, is your drive a USDM Evo VIII, or an Evo VI?

JDM EVO 6

exactly car has been tuned and no leaks.

Ive had 5 Evos but this is the first with a stock 8 turbo. Most have had e9 at least which you just buy a 25 psi wga.

I only want to know of oem solution or after market wga for evo 8.

I want 26-27 psi tappering down to 21-23.

heel2toe

iTrader: (41)

In every gear? What are you using to control boost? In order to gain control of your boost curve per gear realistically the only way is with the use of an electronic boost controller or utilizing a 3 port with the stock ecu.

JDM EVO 6

this car is using a hallman

thanks...so a stiffer wga wont help?

Jerry321

iTrader: (2)

Was your Car tuned boost by gear? But usually tuners do that but boost lowers as it goes higher in the gears.

First thing perform a boost leak to explain what's going on with lower boost on the lower gears.

sparky

iTrader: (1)

I can give you a "Homemade Solution" that should give you 23# in 1st, 24# in 2nd, 25# in 3rd, and a flat 26# in 4th and 5th if you are interested. At least it is worth a try before spending $250 on a FP HD actuator.

Of course your immortal soul and your 1st born will be my property. You do have a MBC and a hacksaw...don't you?

shrtstuff89

iTrader: (3)

a 23psi WGA will guarantee that you have a minimum of 23psi, even with the hallman turned all the way down (which is how my setup is right now). It HAS to be tuned for any increase in boost over what was previously tuned. and honestly a stock evo 8 turbo probly cant produce higher than 26psi at the top of you powerband, which is why it would taper off . the stock 8 turbo only flows 505CFM.

sparky

iTrader: (1)

Edited

sparky

iTrader: (1)

The OP never said that his turbo is exhibiting boost taper. He states that manifold boost pressure reaches an indicated 26 PSI in 5th gear. No one is talking about a boost taper issue....well, except you.

A lot of people have run 32 PSI+ out the top through a stock VIII 16G. It may not be advisable, but it has been done before. It is documented on this forum(i.e. Curt Brown, TurboTrix, et al).

His problem is that he can't hit full boost in the lower gears. This is a common problem especially in 1st and 2nd gears. But, by 3rd gear he should be seeing 23-24# at least. By 4th gear he should be seeing 25-26#, or substantially full boost. Of course the WGA has to be up to par with regard to spring rate and diaphragm and properly adjusted.

JDM EVO 6

its a 10.5 no boost leak

thanks sparky

sparky

iTrader: (1)

I have a homemade solution for you. But, first I want to ascertain a few details about your specific setup. 1) How are you controlling boost? 2) What BOV/DV is on there? 3) What exhaust system components from the turbo on back?