I have the HKS RS Kit and I have to add 12 - 15 of fuel on 3k - 4k just to maintain the afr to below 11

I made 310whp on a dynojet with a mild 10:2 AFR by redline on 91 pump gas

 

I have the HKS RS Kit and I have to add 12 - 15 of fuel on 3k - 4k just to maintain the afr to below 11

 

Yeah you'll see the airflow measured differently, not as a MAF frequency but as an air mass calculation.. but it'll be a dead giveway for you..

The only intakes that do not have any anomolous problems are the ones that do not alter the diameter of the intake, all aftermarket intakes, whether their straight pipe, or tapered, all alter the air velocity from stock. by about 6-10% or more.. the advantage of the HKS is its less prone to stalling with a Recirc BOV because of the taper (it decelerates reversed airflow because it tapers larger) However its also prone to lean conditions.

You guys have to understand that 100% of the gains in an aftermarket intake and MAF pipe are caused by a lean condition (lowered maf reading across the board), since the intake of the turbo is STILL just under 2.5" and the stock tube is 2.5" and the stock MAF is 3" the restriction you will experience before anything is the inlet on the turbo.. The stock airbox, and other components will flow as much air as the stock turbo could EVER demand.. Its designed that way.. Most power gains using the stock turbo are improved efficiency or higher velocity airflow, not necessarily more volume.

 

i have notice that with the UICP from BR w/ 1g BOV and his intake MAF pipe (new MAF pipe by BR) and filter the car runs a bit lean (nothing to drastic) since it sees at WOT near 11.5-11.8. Before it was at 11.2-11.5 , this is on 91 octane, changes are not dramatic as i read in the pass threads with upgraded intakes. The car will be tune again with upgrade injectors and pump.

 

Good info MalibuJack!

 

Good question. Please help!!!!

 

That customer was me. Just wanted to say thanks for doing a great job. My car runs like a dream now and has a good bit more ***. Just bought some HKS 272 cams, ARP head studs, AEM cam gears, and crower springs. I'll be taking it back to Jermaine soon as they get installed. Thanks again and I'll see ya in a week or two.

 

i have just a cone style filter and the stock intake pipe, would this cause a lean condition also?

 

It could.. I noticed the cone filter I had did cause the car to run a little leaner with no other modifications.

 

thanks for the info MalibuJack

 

This thread has been very informative.

I've finally bit the bullet and decided to go with the Utec. This is my first attempt at "tuning" my own vehicle - so I like to absorb as much info as possible. I can't help it - I like tinkering with stuff - it's my curse (by the way - is there any recommended reading on the subject?)

Would you say it's worth the 'trouble' to go with an aftermarket intake rather than opening the exhaust side of the equation?

Is it worth the effort to even use an AI or just keep the stock unit?

Thanks...

 

What have you noticed with the TurboXS intake? Same type of stuff. I am guessing that it is going to be hard to be subjective on your own pieces but it would be nice to know.

Ben

 

Our intake may cause a slight difference in AFR, but not as much as we have been seeing with these others. We do not alter the intake pipe after the maf, anything that changes the nature of the vortices in the intake tract will affect maf readings and afr.

Thanks,

Jermaine~