Razor2001

Hi guys,

What is roughly the stock boost levels I should be getting from a JDM STi-7 100% stock ?

I am just trying to play with the restrictor size (probably going to go the Valve adjustment vs. restrictor soon) and want to know what boost levels I should be achieving. I have a full catless turbo back SS xorst

with a 1.25mm restrictor I am getting the following:

1st gear WOT to about 6,500 rpms max: 13.6 psi / .94 bar, held: 13.2 psi / .91 bar

2nd gear WOT to about 6,500 rpms max: 13.5 psi / .93 bar, held:
13.2 psi / .91 bar

3rd gear WOT to about 6,500 rpms max: 14.2 psi / .98 bar, held:
13.7 psi / .94 bar


I am thinking I should be looking more at 16 psi / 1.1 bar held in 1st and 2nd gear and 17 psi / 1.15 bar held in 3rd - 6th gear. Does this sound about right ?

Couple of notes from DeltaDash on the above run:

knock correction was always positive usually above 9

fueling seemed rich with anything above 3,000 rpms showing higher than 1.0 and usually running about 1.015 on the 02 sensor

injector duty percentage was usually at 86% at WOT between 5,000 - 6,500 rpms

engine bay intake temp was about 32 degrees C during this test blast

Did a 4th and 5th gear load test from 2,500 rpms cruising to WOT and max spike in both gears was 17.5 bar / 1.20 bar


I think the above shows that I have room to increase my boost up to about 16 - 17 psi held.

Thoughts / commenst anyone ?

Cheers,
Ray

PS: I love the ScoobySport turbo back catless xorst !!!

Razor2001

Come on boost junkies surely you must know what levels of boost I should be running my JDM STi-7 at

Cheers,
Ray

Dark Blue Mark

What is a JDM ?

MB

RT

Do a search for the super-long thread "Decat Fix Idea" (or something to that effect) we had a few weeks back. My boost levels are posted there in detail.

With my restrictor at 1.1mm, I tend to get a tad higher boost than you thru the gears. Typically in the range of 0.95 to 1.05bar.

If hold gear 4 at 3000rpm and then WOT, 1.15-1.2bar.

Cheers.

Razor2001

Think it is: Japanese Domestic Motorvehicle

Thanks RT

Pete Croney

Ray

Here's the thread http://www.scoobynet.co.uk/bbs/threa...=80851&Page=11

These figures were probably taken with a temp of around 18degC, so your figures in 32degC will be lower.

JDM means Japanese Domestic Market.

raybotha

Ray ,

I dont know that the way to higher boost is to play with your restrictor size . This makes the car behave well . I read an American article that enlarged the pipe on the solenoid side for higher boost . You should be familiar with that one now ....

Ray

Razor2001

LOL...cheeky