hey guys..

we tune lots of subies with utec's with no issues..... but i have one on our mr, with one of our turbo upgrades and im having some issues...

we normally use AEM on the evo's, but i am trying the utec for kicks...probably be using a HYDRA soon... with MAP base...

anyway... i am fine on fueling/AFR below peak power.... but at top end (6200-8100 rpm) i am having some weird MAF issues..

the inlet pipe is a 3" to 4" smooth transition, about 12" long.... with the stock maf housing using a kn adapter plate...

i am amazed at how sensitive the evo MAF is to begin with....

regardless.....

I am seeing things in my logs such as.... repeats of RPM but with totally different readings..

for instance id get a log line at 7215 with 2100hz and a repeat of 7215 on the next line at 5500hz ...showing completely different values for timing and fueling...

or, i will be at high rpm and at 7200 ill see 2100hz and the 7260 something and it will say 1760 and then jump back up to 21-2200...

the airfuel will then jump lean and so forth....

the car just seems very inconsistent pull to pull with logging, but the numbers dont vary much...

just for reference im using..

fmic, 3" exhaust with high flow cat, tubular mani, 1000cc injectors with walbro (scaled nicely 14.7 at idle and off boost)....10.8 afr peak at the moment, 24 psi...

207whp stock 229tq (mustang)... 365 whp and 323 ft lbs right now...

thoughts? before i just throw the hydra on?? (im thinking bad maf or something bad with the utec on its maf signal offset)

thanx in advance...

chad b
chadblock.com

 

Something is wrong with something :P I doubt it is the Utec but I could be wrong... Mine reads fine however at higher RPM I do get strange readings sometimes as well but not like yours... mine is more like 2250 hertz @ 7k and at 7.3k = 2190 then at 7.6k = 2300. That doesnt seem very logical to me but who knows...

 

lol!

yeah, they do fluctuate alot!! but sometimes it will display like 5500 hz, and it will register a knock count of 1 or 2.... its strange...

malibu?

cb

 

5500Hz????? Dang, my gt-35r only gave me 3000Hz @ 30psi.

 

cbrd, was this with the clutch slipping? I think that could be one of the causes. What scale did you use on the 1000cc injectors?

 

Well, this is one of those classic problems that may be due to the MAF's inability to handle very turbulent airflow. HOWEVER you need to put the stock intake pipe back on, and the airbox if possible to see if it goes away.

If it does not, then you may want to reflash the UTEC or inspect the wiring on the MAF and going to the UTEC closely. But I wouldn't do any of that until you are certain its not the MAF or turbulence. What your describing is a very unusual jump, but a number that high is just unusual and should never happen. So contact turboXS about this, I am fairly certain they had another member with similar symptoms.

 

Malibu,


thankx for the input..... I have done mostly all of those things....ive used the airbox with our inlet pipe, but not the actual inlet hose...since we have a 4" inlet on our turbo...

the utec displayed some weird issues before the turbo went on... such as lines in the log that were absolutely off the wall......

i am going to try to get another utec...

-----

i dont believe it was clutch slip, although the clutch is going to go soon im sure, because that still wouldnt cause a 2100 to 5500 hz jump over 60 rpm and then settle right back down...

we will see, i will call jermaine..

cb
chadblock.com

 

Malibu, since you are online right now, I need to ask you a question.
I have a UTEC, but not installed. I'm confused about the ABS, whether it needs to be installed or not. I also have a Perrin manual boost controller, and a Perrin EBCS. With UTEC, do I need both/any to tune my boost above stock?

I also have the same problem due to the K&N typhoon intake upgrade. Is having HKS EIDS type-K going to solve this?

I've read some of your threads/comments and thought you'd be a good person to ask. Thanks.

 

I am not malibu, but I can offer some thoughts on your questions.

The ABC is not needed, but is usefull for those who do not run an ebc or mbc. Since you are using the mbc, then I think you won't need the ABC.

The problem with the intake needs further explaination. I am going to take a stab here, but you are probably having some stumbling issues. The eids will solve it, but using it in conjuction with a UTEC could negate some of the UTEC advantages. My best recommendation is to ditch the intake and run the stock with a high flow filter. You can adjust the utec to help offset some of the issues, but the stumbling will be somewhat apparent.

Once again, just my .02

 

Thanks I appreciate the response.
From your comments, it sounds like even my Perrin mbc is not needed if I install UTEC, because UTEC can control the boost w/o any external mbc. Is that correct? Let me know if I'm not understanding you correctly.

Another question is, then what is the purpose of ABC?

How can I use Perrin EBCS in conjunction with UTEC? Any comments?

I welcome any comments from anyone, not just Malibu or SGPLancer.

 

The abc is a manual boost controller basically. It's just there to hook up with the stock boost solenoid valve just to help it at high boost levels. You can use the abc + stock boost solenoid or any type of mbc of ebc. It doesn't matter. The utec controls the abc + stock boost solenoid setup. The utec can also control the perrin ebcs since it just takes the place of the stock boost solenoid.

 

^^^What he said.

 

I would change the inlet hose as well. I have heard others with similiar problems from aftermarket inlet pipes. FWIW I have stock airbox, stock inlet hose and my MAF readings are totally linear with 370 WHP.

 

Thanks Widebandphillip!

Now, can anyone out there tell me how Perrin EBCS should work with UTEC? Anyone?

 

I will know in a couple of weeks. I have one on order.