Turbo isf

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May 13, 2016 | 10:11 AM

#31

zazzn

Instructor

Joined: Jun 2004

Posts: 789

Likes: 16

From: NORCAL/GTA

Quote:

Originally Posted by ultimase

Coming from a turbocharging background I'm watching this with a bit of interest. Kinda ironic that I've stumbled into this thread when I'm actually trying to get away from turbo's and onto displacement. But I supposed power is still power.

I'm wondering why no one has even tried with a simple fuel pressure riser. It's not the best way of doing things, but it should get you by for relatively low boost. The only issue there would be controlling timing. But again for low boost applications it's cheap and relatively safe.

As for volumetric efficiency sizing the turbo is really a few calculations and compressor maps away. Not extremely difficult, but does take some time and knowing some information regarding the motor. If you can think of an application there will likely be an off the shelf turbo that can do it, probably even a turbo that's being used on a oem application.

If only it was that simple. The problem is the ECU will fiddle with fuel not matter what you do with fuel pressure. Then there's the fact that you have direct injection as well for partial boot situations. Bottom line, is unless you trick the W/B 02 sensors by feeding back wrong values to keep the car richer for boosted operation nothing is going to work short of cracking the computer. Now, even if you do trick the 02 sensors there is only so much overhead in the fueling map on the computer.

May 13, 2016 | 11:37 AM

#32

ultimase

Intermediate

Joined: Oct 2015

Posts: 399

Likes: 75

From: Ok

Now that's interesting, this might be a dated approach, but normally the wot values are hard coded in the ECU, or at least it used to be. At wot and high RPM's ecu's used to ignore o2 input and mostly rely on rpm and maf readings, things are normally happening too fast at that point to rely on downstream readings.

Though I will be the first to admit, this was from past experience with ecu's and boost from 2000-2010ish. I've been out of the loop quite a bit more recently.

This is sadly where the rarity of the isf is a downfall. A more popular platform would have piggybacks or standalones that could probably find a work around. Rather we have only a few companies trying to crack the code to an ecu on a vehicle that's been out of production for 2 years.

May 13, 2016 | 04:56 PM

#33

FFM

Racer

Joined: Nov 2014

Posts: 1,419

Likes: 136

From: WA

Supercharger is the way to go with this application. Turbos would be for show, much like the couple if not only one I know of on this forum. Rear mounted is also very inefficient for such a low power output so makes the system again, just show.

You would get better gains and better transient response out of a supercharger.

**** Greddy already has one developed. Someone should buy one and just have TTFS or RR tune it.

May 15, 2016 | 03:52 PM

#34

Meraki Autoworks

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RR-Racing just sent me some pics of the supercharger... I'm so excited...

-Josh

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