help me figure out why my cobra hesitates and feels sluggish

xslobcorex · May 25th, 2011, 08:52 PM

Alright, long story short, anytime I really bury my foot in it, my motor bogs. The boost meter pegs out right away, but you really don't feel it throw your head back till maybe 4500rpm. I don't think its clutch slippage (stock clutch I havcent replaced yet), and I've ruled out wheelspin, because in both cases, the rpms would jump right away, but they seem to be building slowly and having a hard time doing so.

The car is plumbed and tuned for a dry shot, which I haven't used yet, and the PO said it has colder plugs in it for the nitrous. Possible culprit? I'm running 92-93 octane if it helps.

The only mods are a smaller blower pulley (don't know the size) and a magnaflow catback. I just feel like anytime I get into it that hard, it should either break loose, or if its hookin up that good, throw by head back in the seat. I wanna get it SCT tuned on the dyno and lose the handheld tuner, but I'm waiting to throw some more mods on it first. Any ideas here?

rk_2000_Z/28 · May 26th, 2011, 11:21 AM

Could be a few things. First thing that pops in my head is belt slip. Boost gauges aren't always accurate (even aftermarket ones). Also, might ask the guy what kind of tune he has on it. Don't know the situation with your car and people and what not, but honestly a lot of people don't know what they are doing when it comes to tuning a dry shot. I know a few tuners in this area that wouln't even touch them for whatever reason. Might check into what tune is on the car for the nitrous. Again, not sure about your specific situation and the tuner and what not but just some ideas you may want to start investigating.

1999cobra92 · May 26th, 2011, 11:25 AM

You might want to get a CAI

xslobcorex · May 26th, 2011, 01:01 PM

Forgot to mention it has a K&N CAI. The tune is just a diablosport handheld tuner. I haven't touched the nitrous at all out of fear. How would I be able to tell if the belt is slipping? The PO did say he had a smaller belt on it due to the smaller pulley.

mfj · May 27th, 2011, 03:00 AM

It might just be the summer heat. It's crazy what a difference it makes with our cars!

Aceswild 02 · May 27th, 2011, 01:50 PM

^+1...its been in the 90's for over a week and my car feels like a dog. I hate it!

xslobcorex · May 27th, 2011, 02:20 PM

I've heard that about the heat, but the car did it while it was still in the 60's.

My first move is gonna be to get the stock mid pipe outta there, then get it to my tuner. The last guy that had the car showed it, and it was a trailer queen. I wanna get this thing set up for power and make sure everything is right with the tune.

plak424 · June 4th, 2011, 05:25 PM

I would bet that its your tune, I'm going to guess that its running too lean. I don't have much experience with the 4V but the motor I tuned acted like that when the A/F was way off

xslobcorex · June 8th, 2011, 07:58 PM

im getting it into the shop next wednesday. i noticed that the diff was leaking, so thats first on my list. i have a feeling that the posi may be cooked, but i got a new diff cover and a brace for it.

after i get that shit squashed, im throwing headers, xpipe, and new throttle body on it, so im gonna have to get it tuned. ill post my findings in a week, but damn do i hate being car-less.

Trick Tuners · June 9th, 2011, 11:49 AM

Post up a data log on my site.
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May 25th, 2011, 08:52 PM	#1
xslobcorex Regular 2004 Cobra Join Date: May 2010 Location: suburban philly Posts: 196 iTrader: 0 reviews	help me figure out why my cobra hesitates and feels sluggish Alright, long story short, anytime I really bury my foot in it, my motor bogs. The boost meter pegs out right away, but you really don't feel it throw your head back till maybe 4500rpm. I don't think its clutch slippage (stock clutch I havcent replaced yet), and I've ruled out wheelspin, because in both cases, the rpms would jump right away, but they seem to be building slowly and having a hard time doing so. The car is plumbed and tuned for a dry shot, which I haven't used yet, and the PO said it has colder plugs in it for the nitrous. Possible culprit? I'm running 92-93 octane if it helps. The only mods are a smaller blower pulley (don't know the size) and a magnaflow catback. I just feel like anytime I get into it that hard, it should either break loose, or if its hookin up that good, throw by head back in the seat. I wanna get it SCT tuned on the dyno and lose the handheld tuner, but I'm waiting to throw some more mods on it first. Any ideas here?

May 26th, 2011, 11:21 AM	#2
rk_2000_Z/28 Forever in our hearts travis_afx 2003 SVT Cobra Join Date: Apr 2007 Location: Enid, OK Posts: 4,311 iTrader: 0 reviews	Could be a few things. First thing that pops in my head is belt slip. Boost gauges aren't always accurate (even aftermarket ones). Also, might ask the guy what kind of tune he has on it. Don't know the situation with your car and people and what not, but honestly a lot of people don't know what they are doing when it comes to tuning a dry shot. I know a few tuners in this area that wouln't even touch them for whatever reason. Might check into what tune is on the car for the nitrous. Again, not sure about your specific situation and the tuner and what not but just some ideas you may want to start investigating. __________________ 03 Cobra-Slow 02 SS, 00 Z/28-Gone Rest In Peace Travis Billings

May 26th, 2011, 11:25 AM	#3
1999cobra92 Enthusiast 1999 mustang cobra Join Date: Aug 2010 Location: Los Angeles, Ca Posts: 882 iTrader: 1 reviews	You might want to get a CAI __________________ Black and White Crew Crew Member # 5 Check garage for mods and pics if you Los Angeles and want to ride send me a text (323) 270-6827 0% Wheel hop, 0% broken parts, 100% wheel spin

May 27th, 2011, 03:00 AM	#5
mfj Banned 2001 Cobra Join Date: Feb 2011 Location: Hot Town, AZ Posts: 416 iTrader: 0 reviews	It might just be the summer heat. It's crazy what a difference it makes with our cars! __________________ 2001 Cobra- Stroked/Poked/Cammed/Blown 1996 Cobra- CF Clutch/STS/Lowered/CAI- otherwise stock... The daily driver... [SIZE="5"][B][COLOR="Blue"]MM Cobra Club #3.4[/COLOR][/B][/SIZE] [SIGPIC][/SIGPIC]

May 27th, 2011, 01:50 PM	#6
Aceswild 02 Hardcore Enthusiast 2003 Cobra (vert) Join Date: May 2010 Location: Augusta & Atlanta, GA Posts: 2,983 iTrader: 1 reviews	^+1...its been in the 90's for over a week and my car feels like a dog. I hate it! __________________ MM Cobra Club #2.6

May 26th, 2011, 01:01 PM	#4
xslobcorex Regular 2004 Cobra Join Date: May 2010 Location: suburban philly Posts: 196 iTrader: 0 reviews	Forgot to mention it has a K&N CAI. The tune is just a diablosport handheld tuner. I haven't touched the nitrous at all out of fear. How would I be able to tell if the belt is slipping? The PO did say he had a smaller belt on it due to the smaller pulley.

May 27th, 2011, 02:20 PM	#7
xslobcorex Regular 2004 Cobra Join Date: May 2010 Location: suburban philly Posts: 196 iTrader: 0 reviews	I've heard that about the heat, but the car did it while it was still in the 60's. My first move is gonna be to get the stock mid pipe outta there, then get it to my tuner. The last guy that had the car showed it, and it was a trailer queen. I wanna get this thing set up for power and make sure everything is right with the tune.

June 4th, 2011, 05:25 PM	#8
plak424 Regular 2000 Mustang v6 16.683@83.86 Join Date: Feb 2010 Location: CT Posts: 344 iTrader: 0 reviews	I would bet that its your tune, I'm going to guess that its running too lean. I don't have much experience with the 4V but the motor I tuned acted like that when the A/F was way off __________________ A turbo, exhaust gasses go into the turbocharger and spin it, with a supercharger, air goes in,witchcraft happens and you go faster~Jeremy Clarkson

June 8th, 2011, 07:58 PM	#9
xslobcorex Regular 2004 Cobra Join Date: May 2010 Location: suburban philly Posts: 196 iTrader: 0 reviews	im getting it into the shop next wednesday. i noticed that the diff was leaking, so thats first on my list. i have a feeling that the posi may be cooked, but i got a new diff cover and a brace for it. after i get that shit squashed, im throwing headers, xpipe, and new throttle body on it, so im gonna have to get it tuned. ill post my findings in a week, but damn do i hate being car-less.

June 9th, 2011, 11:49 AM	#10
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	Post up a data log on my site. Datalogging - Trick Tuners Forums __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

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