Hi fellas,

I just did a full port/polish job on my EVO VIII which was flow benched and put on HKS 264's and HKS cam gears. Had it tuned (Ecutech) and got 277 WHP and 260 lbs. This was achieved with only 17.5 psi boost. Fuel here is crap (90 RON) so hence the low boost. I want a bit more but don't want lag and want my car reliable with low end grunt. This car is not for drag racing and will use it maybe 2X to 3X a week. My tune says beyond peak boost (4.5K rpm/17.5 boost), the stock turbo can't satisfy the volume requirements of a better flowing head hence the need for a better turbo. If I get +25 to 50 whp more this will make me real happy. I was looking at the FP greeb turbo. Is it too much for my set up?

Many thanks in advance guys,

 

Anytime you go with a bigger turbo, your going to get more lag. Once your in boost, and shifting through the gears the lag is gone. I have a gt35r and I only have lag when I first get in the gas..... Once out of the initial lag everytime I shift to the next gear the car pulls harder and harder. So really all you want is 25-50 whp gain, and close to same spool time as the stock turbo?

 

How about the stock Evo 9 turbo and some meth (to compensate for the low octane)? Crank that sucker to 25psi and watch it fly.

 

No meth. Maybe a stock Evo 9 turbo would do.

 

if your only pushes 17lbs you can easily gain 25-35 horse with more boost. that turbo is good for 20lbs of boost. I was making 365whp with the old stocker on 23lbs dropping to 20lbs at redline. you need to find a way to max out the turbo so u need a higher octane. you may be able to do it with biiger injectors. get a some 650-700cc injectors and a walbro fuel pump. Head work? thats absurb. There is an evo near me with 900whp ran 9.26 @ 156mph with stock heads and a ported intake manifold. that would be waste of a lot of money. maybe get a new tuner.

 

I've done the headworks bro so many is out of the bank. I got a 50 whp increase on lower boost. The suggestion for bigger injectors and a walbro fuel pump with an increase in boost sounds like it makes sense. Octane is poor so maybe 20 psi max boost is where I'll head. Can't risk detonation.

 

Ported heads are not really meant for STOCK turbos. They will actually make the turbo spool slower, and like you stated the turbo can't flow enough cfm to maximize the extra volume you made in the head. Its almost like running a SMIM on a stock turbo IMO its useless. These kinda upgrades are meant for cars flowing some serious air so everything can be, lets just say used to the " fullest " lol. Basically, if you knew that porting your head on the stock turbo was useless cause of flow purposes, why would you do it ? Especially since you yourself just stated above the sole reason NOT to port a head while running the EVO's original power adder. Although in due time when a turbo upgrade is in the cards, you won't be disapointed then with all that extra volume and extra CFM your choice of turbo will be flowing =) BTW, if your looking for more power through a different turbo. The FPGREEN is the best choice you can make to help avoid wat makes an EVO, an EVO. That being is TQ, response and jsut all out ***** to the walls without having to wait till 5k for the party to start. The FPGREEN is a EVO9 turbo with different wheels inside giving it a 40+whp gain over the stockers 03-04 / 05 / 06 ( all those years have different turbos ) You'll lose about 200-300 rpms of spool when running the FPGREEN over the EVO9 turbo. Right now the FPGREEN is hot on the market. Be prepared for a LONG wait for that turbo from FP.

 

Hi EVOslow,

Thanks for your post. I'm actually happy with the performance of the car but feel perhaps I could use more top end. I've noticed the FP green turbo and am considering it. Is there really a waitlist? They got back to me suggesting it but didn't mention anything about the wait list.

 

man 90 octane sounds like a bummer, do you guys have race gas there? or can you get some shipped to you.

 

the fp green is a great turbo to keep stock like spool, but if you cant add more boost than 17lbs theres no sense in getting it. people are making more power on it because it can hold about 24lbs at redline. I ordered one and waited about 2 months and never recieved it. So I changed my order to gt35r. Im very happy with it. My main point is this; you haven't maxed out the stock turbo yet. You should be able to make 40-50whp more if you up the boost and add LICP UICP.

 

Indeed. I'm putting on a turbo outpipe and will tune the car again to about 20 to 22 lbs. The pump gas here reads 96 RON but I don't really think it's that high. I'll be real happy if I get about 30 to 40 whp more from this. So far the car has a lot of low end and mid range which I want to keep. No use trying to go for top speed as I think this cars handicap is its aerodynamics. It's strength is in twisty roads. For real high speeds I have my 997 GT3 to play around with. As for the FP green, I don't mind waiting.

 

Theres one mod that makes the evo really shine....and thats cams !!! throw some 272's in that ( valvetrain not needed ) and ull see a 30+whp gain there man. but you hafta find a way to get those boost levels up.

 

dude u can push so much more on that turbo.. i have 310 hp 315 toruqe on stock turbo and bolt ons that its.. its tuned at 22 psi and the evo VIII come stock at 19 so u lowered ur psi which makes no sense considering u had it tuned.. esp when ur only driving it two or three times a week get that ***** cranked to 23 psi..

 

once u upgrade ur fuel pump the injectors can handle the extra flow and bam u have 300 whp

 

Evoslow, I have 264 HKS cams and cam gears. Totalbls14, the reason the tuner lowered the peak boost was to be conservative since as I mentioned in my previous posts, the fuel here is really bad. But yes I think 17.5 lbs is way too conservative so we are going to tweak it higher once I get the turbo outpipe next week. I guess he lowered the boost since I told him I wanted to get about 275 to 280 whp with no lag and lots of mid range and most of all, it had to be reliable. Don't get me wrong, I love the way the car performs. It has almost no lag, lots of midrange and doesn't detonate. So I guess he stuck to 17.5 lbs boost when he got good numbers. But as in every case, power is addicting and now I want a bit more.