when i hold the rpm's around 2~3k for a few seconds the car starts to surge like it was loading up? it also has a wierd power loss just as you tip in the throttle where the car actually feels like it was slowing down.
the car has a blower on and heads and cam, what can i do with ls1edit to fix this???

 

I would be Interested in the answer to this question my 2000 C5 has had the same problem
for quite some time now I have played with the fuel and the timeing settings still have the same surge <img border="0" alt="[Banging Head]" title="" src="graemlins/gr_banghead.gif" />

 

i also messed around with the timing and maf settings but it doesn't seem to help.
do you have the T-body blade drilled?

 

Dirty, same problem here and I have Ed Wrights tuning...It also does it after a dyno run, It surges until it catches itself. I also have a small hesitation on take off when the car is cold. I didn't have this with my first program from ed but its present in this one.
I have the B1 Cam and an A4.
Do you have an FMU?
J <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

 

force fed, i don't use an fmu, it's all tunning and 50lbs injectors. was your ED wright tuning done for the supercharger, or did you have it done before the blower was on??

the weird thing is mine seems to do it more when it's warm. and it's not at idle but under light throttle.

mustang hater , i think you have something there. i had these sensors on for a while now and i'm sure it's time for new ones. guess that'll be my next project.

 

I think it may have something to do with the ati kits pushing thru the maf.

If I remember correctly others have relocated the maf pre blower to aliviate this problem.

 

wouldn't that cause the car to run super rich unsed part throttle since the BOV valve would be ope and letting all that metered air out ?

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1dirtyZ:
<strong>wouldn't that cause the car to run super rich unsed part throttle since the BOV valve would be ope and letting all that metered air out ?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not if you put the MAF pre-surge(bov) valve.

I didn't have to bad a problem with surging but, by relocating the MAF the idle was smoother. If you have high Ltrims it will also cure this. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> The high Ltrims are caused by the way the fresh air tube is hooked up on the stock ATI setup.

You basically have to connect the MAF right to the filter and then to the accordian tube that goes to the blower inlet hat. The MAF wires will need to be extended of course. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

JAS originally did this with his ATI kit with good results so I tried it and had no problems. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

John

 

i guess could give that a try, cause my Ltrims are up thereno matter what i do.

could you explain to me how this set up would work since the air goes through the MAF then the blower then the BOV . wouldn't this cause metered air to escape under part throttle? as opposed to the stock ATI set up where air goes through the blower then ( if needed) through the BOV then what's left is metered through MAF.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Blackbird:
<strong>I think it may have something to do with the ati kits pushing thru the maf.

If I remember correctly others have relocated the maf pre blower to aliviate this problem.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

The ATI kit PCV fresh air feed is pre MAF (which is bad)/ (also pre-blower which is good)after you install the ATI kit. If you notice your original fresh air PCV feed was at the TB; well this is now capped off and routed down by the filter.

Although this is good (for boost system), it caused a nasty idle surge and some crazy ltrims when I first installed the kit.

I moved the MAF pre blower right after filter and boom, stock idle. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> (The PCV system air circulation in once again "metered" by MAF )

With the ATI setup, it's sort of like having an aft MAF leak... think about how the air circulates.

The BOV location isn't the best but lets take 1 issue at a time.

I run an LS6 MAF so that's another reason to use it as a preblower... its press fit PLASTIC. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Besides, the Vortechs run pre blower and don't have these issues. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

The ATI kit is nice for the money, but they could of spent a little more time on it for sure.

Anyone else run a MAF pull-through conversion in ATI form besides me and XLR8NSS?

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1dirtyZ:
<strong>i guess could give that a try, cause my Ltrims are up thereno matter what i do.

could you explain to me how this set up would work since the air goes through the MAF then the blower then the BOV . wouldn't this cause metered air to escape under part throttle? as opposed to the stock ATI set up where air goes through the blower then ( if needed) through the BOV then what's left is metered through MAF.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The BOV air is recirculated into the the blower again in the ATI kit. In the MAF conversion, the air that is metered has only one place to go, the intake.

Now if you vent your BOV to atmosphere, that's another issue. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

aaahhhh!! i see, i kept thinking of air going through the bov as wasted air now it makes sense.
could you clarify the PCV part? if i install the maf before the blower ( right btw. the filter and the accordion tube) wouldn't the pcv line be after the maf ( plumbed into the inlet hat)? won't that act as unmetered air?

now can i find an already extended maf cable somewhere?? like an adapter or extension that requires no splicing or cutting?

now hypothetically speaking, what has to be done if the BOV was vented into the atmosphere?

<small>[ December 03, 2002, 12:39 AM: Message edited by: 1dirtyZ ]</small>

 

If you put the maf between the filter and accordian tube, then the pcv line(from the inlet hat) will be pulling in air after the maf, hence metered air for the pcv. I think I remember ramchargers saying they had maf extension lines for sale. I haven't done this mod, but might go ahead and try it. My idle will fall on it's face once every 2 or 3 minutes, almost cutting off then rising back up.

What materials did you guys need to attach the maf? Might be a good time to get an ls6 maf too.

 

I made my own extension harness. I think I remember Mike L. from RamChargers saying he has an extension harness, but I'm not positive.

I'm using and extended range LS6 MAF. If you use a stock LS6 MAF and tables you will be in trouble since it tops out a LOT sooner then even a stock LS1 MAF does (MAF Tables that is).

What kind of ltrims were you guys seeing before and after the kit install at idle?

 

thanks Azzhauler , i just ordered the 6' extention from ramchargers.

as for ltrims, i could never get them to go negative, it was always 7% or higher.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1dirtyZ:
<strong>thanks Azzhauler , i just ordered the 6' extention from ramchargers.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Careful with that 6' harness! I had it on my powerdyne and it caused me to set a high frequency code on the MAF and just plain cut out after about 2psi and 4000 rpm part throttle. I switched to a 3' harness and the problem went away. The 3' is enough to get you to the bottom of the radiator with a little slack. I don't know if I had a bad harness or what, but going from 6' to 3' solved my problem (both from Ramchargers).

-Geoff

 

thanks white 2k2 hawk, just changed my order to the 3' one.

 

Dirty,
I have had two blowers on the car a 6psi powerdyne and now my 9psi ATI. Ed did the tuning for each. I still have an FMU. I had the MAF before the blower on the powerdyne and didn't have the problem then.

As for the PCV line couldn't I just tap the plenum and put a barbed fitting into the plenum and hook the PCV line up there? If I did this with the relocated MAF it will be after the blower and after the MAF. Good thing or bad thing?

I can mount the MAF before the blower, I still have my MAF extension from the PD kit, but I don't have the stock ATI Bypass valve. I have a TurboXS Type H that vents to the atmosphere. What should I do there?

Also what do I need to do to get rid of my FMU? Do I take the fuel line that feeds it, and hook it directly to the fuel rail?
Thanks,
J

<small>[ December 03, 2002, 06:30 PM: Message edited by: frcefed98 ]</small>

 

force fed, for your pcv thin , i'm asking the same questions,
as for the fule thing you could get some 50 lbs injectors and make sure you have an adiquate pump. you'll have to get the car dyno tuned for the best results, none of that mail order tuning.
you'll have to remove the fmu and return the fule line as it was when stock ( right into the fule rail).
hope this helps.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by frcefed98:
<strong>As for the PCV line couldn't I just tap the plenum and put a barbed fitting into the plenum and hook the PCV line up there? If I did this with the relocated MAF it will be after the blower and after the MAF. Good thing or bad thing?Thanks,
J</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No. You don't want you free air PCV to be under boost. It has to go pre-blower and if you relocate MAF, aft MAF. In other words between the blower and the MAF.

How the heck did you run the fresh air tube with the powerdyne kit?

If you vent to atm., then the metering should be interesting.