So I've been researching turbo's for quite some time and lurking around the forum. I really like the f-body and have been looking for something to do a 6.0 or 5.3 ls swap in. Finally found a car today, and am gonna need LOTS of advise. Been drag racing with family for two years but still not very mechanically savy, BUT i want to learn. SO details about the car:

-98 Camaro
-LS1 (less than 2k miles), LS6 intake, 85mm TB
----Cam and springs : Adv Dur 275/277 Lobe Sep. 110
----Duration: 222° Int / 224° Exh. @ .050'' Lift
----Valve Lift .566 .567
-BTE glide w/ TB and 3800 converter--likely needs to be tightened and PG rebuilt
- Holley XFI 2.0 with painless wiring
-Suspension: single adjustable front and rear shocks, upgraded BMR k-member, BMR panhard bar

The car already has several upgrades to it that will save some me some time and $$$ from not having to add them myself. Now the bad--the car was used for drag only, but then converted to a street vehicle. Since this swap, the previous owner wasnt able to get the car tuned properly for street driving--supposedly its an issue with the air idle control valve/motor. Seems to be a common issue with xfi systems if you unplug the IAC with ignition ON. So the XFI needs to be sent in and flashed. The car idles fine until it's under load (reverse or drive) and then if you don't give it gas it will shut off. Also, it starts to stumble around the 3-4k rpm mark but is fine once you get past that range. Not sure if that's a tuning issue, or if its still an issue with the IACV...but i'd like to get this thing running smoothly with a decent tune before I go adding a turbo setup

Any thoughts or opinions on the idle and stumble would be greatly appreciated. As of now, gonna plan on sending the XFI into FAST and having the driver repaired. Not sure if the IACV itself is bad or not ( i do believe it's always open currently).

Thanks in advance!
-JR

 

It was clear it wasn't a street car when yo said it had a glide in it.
I'd take this post to another section for better help man since it seems like its getting ignored. Sounds like your on the right track. Send it back and communicate with them on your issues so they can help you resolve it.

 

Want it to idle better and make good power with a turbo? Get rid of that cam.

 

+1 on getting that cam out of there

 

Why do you guys think that cam is the root cause for idle issues?

 

Can you guys point me in the right direction about a better cam selection? And what specifically is the issue with the current one? Like I said..pretty new to this

 

Talk with Martin Smallwood, LJMS, or Tick Performance on cams. They'll point you in the right direction.

 

That cam only has 3 degrees of overlap @.050. It's not going to cause the issues he's mentioning.

My FAST XFI 2.0 also had issues with the IAC motor not working properly.

If the IAC motor doesn't work right, then the engine will never return back to idle or idle properly. Some tuners can tune around this and not even use an IAC motor, but I would only recommend not using an IAC motor on a race car.

 

Appreciate the info. As I'll be slowly trying to make this more streetable, I'm planning on sending the unit in to have the driver re-installed.

Next question--i pulled the TB and IACM off today for a good cleaning--is it possible that the IAC does not have the appropriate tip? The motor has a BBk 85mm TB and this IAC valve https://davesdiscountautoparts2014.s...r_control.html

 

Nvm...figured that part out. Borrowing IAC tester so when I get home next week I'll be able to check the signal from the xfi and make sure it is in fact sending a faulty signal