2+2

Those of you with chips and especially chips with 3.0 bar fuel pressure regulators, how do you guys pass emissions testing. I would think that your cars would fail because of the added fuel?!? Anyone have such a set up with experience in this field? Thanks

TT

If your chips are designed for use with the 3bar FPR, they will readjust the fuel maps for the extra fuel. My car just recently passed emissions here in MD with the 3bar FPR setup and a readjusted stock chip. Gas cap pressurization failed, but they waived it.

Alpine951

My chips did not require the 3 bar but I added it last year. Car passed two weeks ago no problem. Time to take the cat off and put the test pipe back.

Matt Sheppard

I just did mine (California smog - test only)

I cheated and put the 2.5 BAR regulator and stock computers back in . . . Passed just fine.

2+2

TT: I thought your chips would be tuned for more HP at 3 bar so it would burn quantitatively more fuel through out the rev range resulting in higher emissions than allowed for a stock car?!?

Alpine: interesting...I would not think you could pass. Maybe MA tests are not as tough?

Matt: That is the scenario I would want to avoid..dont need the hassle, already have to put in cat.

RJP 951

In Ohio, you get a "collector car" license plate. In addition to proudly letting people know of your car's collector status, it means the car is exempt from emissions testing.

Ron

TT

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica"> TT: I thought your chips would be tuned for more HP at 3 bar so it would burn quantitatively more fuel through out the rev range resulting in higher emissions than allowed for a stock car?!? </font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">The way to more HP is more air. All the aftermarket kits do this various ways (shims, jetted banjo bolts, etc.) to get your boost above the stock level of 10 psi. The 3 bar FPR chips are adjusted to keep the AFR basically at the stock levels (some a bit richer) under engine loads where emissions are tested. They will go even richer under heavy loads or boost, but that won't matter for your emissions test.

SherionG

I am only running stage two chips in my 951 with a 3" testpipe, but was able to pass my inspection in Texas. Prior to the inspection, I got the engine pretty hot, worth the time too.

turbite

I left the chips and FPR in for the smog, and everything went fine.

I peeled the sticker off the FPR, and they had no idea it was adjustable. In fact, I think the probably thought the damper was the FPR.

Either way, they didnt know/care.

sybelix

By using Guru stuff chips..no problems..

Danno

Thanks Tommy! <img border="0" alt="[bigbye]" title="" src="graemlins/xyxwave.gif" />

"I thought your chips would be tuned for more HP at 3 bar so it would burn quantitatively more fuel through out the rev range resulting in higher emissions than allowed for a stock car?!?"

The way our chips are designed is to work WITH a 3-bar FPR. So at idle where flow is the same as stock, I dial back the fuel -9% to compensate for the higher fuel-pressure. Then as you go up the maps to higher loads and flow, I actually dial back fuel a little in the mid-range because the stock chips are a little rich. Then in the full-load, high-RPM range, there is more fuel to match the higher flow-rates of higher-boost & big turbos.

So the way the mapping works is that the lowest amount of fuel dispensed (idle) is less than stock, while the highest amount (full-load, high-RPM) has more than stock. So the lowest valleys are lower and the highest peaks are higher on the 3D maps. It's kinda like dynamic range in music.

Then to scale for injector sizings, I just subtract a fixed percentage from the duty-cycle based the ratios of the new injector size compared to stock. This scales the entire fuel-maps up and down linearly without modifying them. This also preserves the same look-up point so you don't skew your ignition values.

Chris Evans

Man that must suck to have emissions testing. I dont have a cat on any of my vehicles. I ran straight down pipe on my Supra and Eclipse. I guess there are some advantages to live in Oldham County Kentucky with all the Mustang and Camaro boys,lol.

turbo944

Hehe...same here. I registered my car through my parents address as my permanent address since I'm bouncing around till I move away from the area in a few months and plan to leave it registered there once I'm gone. Can't beat a $25 a year registration and no emissions testing!

Cheers!

2+2

Danno, so with your set up, your customers have not had any problems passing emissions testing?? Even in CA??