Drilled out AirBox, Boost Cut?
#1
Full Member
Thread Starter
Join Date: Nov 2001
Location: Aurora, Colorado
Posts: 187
Likes: 0
Received 0 Likes
on
0 Posts
Drilled out AirBox, Boost Cut?
OK, my car is a 94 touring with a downpipe and K&N filter. I opened up the stock airbox today and when I was test driving it. I hit boost cut at top of 3rd gear. The car seems a lot faster, but that boost cut makes me nervous to get on it. Is it something I should worry about? The car only has a downpipe on beside the intake, but the temperature was like 30 degrees. Would that make it hit boost cut? My A/F ratio was right around 13-13.5 when I tested it.
Bottom Line
Drilling out the airbox made a big difference in performance.
I hit boost cut with only a drilled air box and downpipe.
Should I be worried about the boost cut or was it just the cold weather? (30-40 degrees)
Should I look at getting a PFC or Boost Controller?
Thanks
LJ
Bottom Line
Drilling out the airbox made a big difference in performance.
I hit boost cut with only a drilled air box and downpipe.
Should I be worried about the boost cut or was it just the cold weather? (30-40 degrees)
Should I look at getting a PFC or Boost Controller?
Thanks
LJ
#2
Z06 powered FD
Join Date: Mar 2001
Location: Dallas, Texas
Posts: 1,883
Likes: 0
Received 0 Likes
on
0 Posts
You will need a boost controller sooner or later so might as well get one now and see if it helps. I basically have the same mods as you and never hit boost or fuel cut. Of course this is Texas and I wouldn't drive my car even if it was 30 degrees.
#4
Full Member
iTrader: (6)
Join Date: Sep 2001
Location: Batavia, OH
Posts: 105
Likes: 0
Received 0 Likes
on
0 Posts
Are you sure you didn't hit the rev limiter? That's real easy to do in 3rd if you're at WOT watching the boost gauge and not the tach.
I don't know of any 'boost cut' feature in the stock FD. The stock ECU has no idea how much extra boost you're making with the mods you've done.
I don't know of any 'boost cut' feature in the stock FD. The stock ECU has no idea how much extra boost you're making with the mods you've done.
#5
Full Member
Thread Starter
Join Date: Nov 2001
Location: Aurora, Colorado
Posts: 187
Likes: 0
Received 0 Likes
on
0 Posts
Im posative it wasnt the rev limiter. I dont have a boost gauge, I was looking at the tach. The stock ECU can tell how much boost with the MAP sensor. The stock ECU cits boost at diff pressure depending upon RPMs, there is a chart somewhere on the forum. Any one with any ideas?
#6
Passenger
Posts: n/a
it's fuel cut and it'll happen at 3rd on gears since the ecu have enough time to react. Look at my mods, they're very similar to yours except I just ordered the Apex'i GT exhaust and PFC yesterday and soon to be installed. With only downpipe and custom cold air intake, you're probably hitting 12-13 psi at WOT like me. The stock ECU is programmed for no more than 12 psi and when that limit is exceeded it would stop pulling at 6500rpm. Lose the next race you're in or spend $1100 like me and get a PFC...at least that's what people on the forum are suggesting. I'll see in a few days when all the goodies are installed, I'm really looking forward to have this annoying *** problem fixed.
Adrian
Adrian
#7
Full Member
Join Date: Oct 2001
Location: Ontario Canada
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
You can install what is essentially a pair of holley carb jets, one in the pre-spool and one in the wastegate vent lines. This limits the amount of boost that can be produced and also prevents spiking for under 10 dollars. This is also what Pettit reccomends to do when you install even just a downpipe. If you give them a call they can probably help with what sizes you need for your application.
Hope this helps,
Andrew Wojteczko
Hope this helps,
Andrew Wojteczko
Trending Topics
#8
Rotary Freak
I was wondering about the fuel cut on the FD. Ive never heard of FDs needing a fuel cut defenser??? I have a stock K&N air filter, dp and cb but I really don't think I've ever hit fuel cut. I have had the boost gauge spike at 13-14 psi.
Am i missing something?
Am i missing something?
#9
Senior Member
Join Date: Oct 2001
Location: NNJ
Posts: 567
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by 2FAST7S
I was wondering about the fuel cut on the FD. Ive never heard of FDs needing a fuel cut defenser??? I have a stock K&N air filter, dp and cb but I really don't think I've ever hit fuel cut. I have had the boost gauge spike at 13-14 psi.
Am i missing something?
I was wondering about the fuel cut on the FD. Ive never heard of FDs needing a fuel cut defenser??? I have a stock K&N air filter, dp and cb but I really don't think I've ever hit fuel cut. I have had the boost gauge spike at 13-14 psi.
Am i missing something?
Thread
Thread Starter
Forum
Replies
Last Post
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM