3800 anyone have any tips on tuning with an IC?

[xttc2000]

i was able to somewhat scan jons car today. by that i mean i was able to read the o2's and timing. used a generic snap on scanner.

o2's are really eratic at idle, ranging anywhere from 100-700 and peaks to 950 every now and then. when under load the o2s are in the 900's

at WOT the o2s seem to be a nice steady 940.

timing- at idle puts it between 25-35

at WOT timing drops to 10-12, id assume theres some knock causing this.

the pulley on there is a 2.8" the car feels slow, it was a LOT faster before the IC.
with a 3.1" pulley it feels the same as the 2.8", still not as good as before.

the car no longer barks second gear, and doesnt light up the tires from a 30mph roll.

the only code being thrown is the EGR code.

what do you all think?

Click to read more...

 

[alexgtp]

What is your KR?
What is timing at WOT?
What are your o2's at WOT?

SOunds like crazy KR..pulling timing at WOT.

 

[xttc2000]

kr i wasnt able to scan with the scanner i had.

o2s at WOT are in the 940s, which i think is damn near perfect.
timing at WOT is 10-12.

the way timing is pulled so hard it has to be knock, which there shouldnt be with the mods on the car.
headers, 1.9rockers, DHP, IC, CAI,- should be enough for a 2.8?

the pump being run with the IC i beleive is a 15GPM, everyone else runing the IC's is runing 3-5gpm pumps. could the faster flow be getting the water in and out too fast to cool it?

 

[beyerch]

.940 is too rich with intercooler.

i'd check for vacuum leaks though for why the car is dogging?

 

[xttc2000]

where do you want the o2s at with an IC?

vacuum leaks i havnt really checked for, the car idles and seems to run very smoothly- just lacks power.
its tough finding vac leaks on these cars with all the sucking and whining going on.

 

[BumpinGTP]

try a 3.0, you might be gettin some KR with the 2.8

 

[xttc2000]

now to find someone with a 3.0" ZZP pulley and an autotap......

 

[alexgtp]

You really need to scan for KR. That is the most important thing..

Find a scanner that monitors KR.

ALso ideally you want to be in the .89-92 range..

I have a full exhaust headers ..rockers and get 4-5 degrees of KR.. with a 3.25 :-(!!!

 

[BumpinGTP]

i have a 3.0 ZZP, i live near orland park

 

[CoolGTX]

me and alex took the car for a spin yesterday=3 Q/M passes, and I had 3.0 on=10PSI, and O2=940-910, IPW=19...OH 0KR
cam, headers, APP104s, I/C, free flow exhaust.

You guys need to get an autotap bad.. before something bad can happen.

 

[alexgtp]

Yeah J/O car was sick as hell. I still have whiplash from all the torque!!
I feel sorry for his brakes.!

 

[sr71_rgl]

Originally posted by xttc2000@Mar 1 2004, 03:23 PM


at WOT timing drops to 10-12, id assume theres some knock causing this.

the pulley on there is a 2.8" the car feels slow, it was a LOT faster before the IC.
with a 3.1" pulley it feels the same as the 2.8", still not as good as before.

Sounds like you're getting a couple degrees of knock w/the 2.8. I'd either put the 3" on and check the butt dyno or get something to scan KR for you.

 

[VHGTP]

Originally posted by CoolGTX@Mar 1 2004, 05:45 PM
me and alex took the car for a spin yesterday=3 Q/M passes, and I had 3.0 on=10PSI, and O2=940-910, IPW=19...OH 0KR
cam, headers, APP104s, I/C, free flow exhaust.

You guys need to get an autotap bad.. before something bad can happen.

are u still running a stock tranny, or have u upgraded to something heavy duty... cause u must be pushing mid three hundreds in the torque department!

 

[CoolGTX]

Originally posted by VHGTP+Mar 1 2004, 07:35 PM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (VHGTP @ Mar 1 2004, 07:35 PM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-CoolGTX@Mar 1 2004, 05:45 PM
me and alex took the car for a spin yesterday=3 Q/M passes, and I had 3.0 on=10PSI, and O2=940-910, IPW=19...OH 0KR
cam, headers, APP104s, I/C, free flow exhaust.

You guys need to get an autotap bad.. before something bad can happen.

are u still running a stock tranny, or have u upgraded to something heavy duty... cause u must be pushing mid three hundreds in the torque department! [/b][/quote]
I have a c-ya tranny since Nov., because the chains took out my Input shaft.

I ran low, low 13s..13.0-1-2, on the stock tranny for 2 years...No I/C till Jan.

 

[JonPGTP1]

I shouldn't have any knock with the 2.8....and there will be no difference in power with the 3.0, so pulley size is out of the question. Something else is wrong. Also wouldn't the car run like crap if i had a vacuum leak?

 

[gtphale]

I wonder if with the new power you are slipping the tranny. I had this happen when I got my cam. Car felt really good first time down the track I toasted some of the gears. Couldn't figure out why the car was running so bad. I messed with pulleys and going to a 3.4 actually made my 1/4 mile passes faster cause there was less slip.You need an autotap and see how long it is taking for your car to shift gears.Your O2's are actually rich. You can go down to a .89 with the IC but .91 is ideal.

 

[gtphale]

Oh also check your iac for errotic numbers that will dictate if you are getting vacuum leaks. I think thats the right sensor maybe Charles can shed some light on that for you.

 

[JonPGTP1]

I think the tranny is fine

 

[fstgtp]

2.8 is pretty small, unless you are cammed, may be too small.

I would try a 3.0, see if it changes. Best bet is to scan, speculation will get you no where.

-fstgtp

 

[CoolGTX]

Originally posted by JonPGTP1@Mar 1 2004, 08:46 PM
I think the tranny is fine

hard to help ya when you are sooo sure of yourself.

was the car running like crap before, and how long has it been acting like this?

how many mods have you done since its been running like crapola?

what do you think is wrong?

If you think it is the I/C, take it off, and see if all goes back to normal.
I tell this to anyone who cant figure out whats wrong and has done mods recently.

its helped some, and some wont listen, so its up to you.


HTHs

 

[JonPGTP1]

The car isn't running like crap...it's just not as fast as it was before we installed the IC. Before ->>>WOT at 30-40 mph = tires ripping loose and chirping into 2nd....now = maybe a little spin and no chirp shifting into 2nd.

 

[JonPGTP1]

Would anyone with an autotap want to meet up and help me figure out what's up?

 

[gtphale]

Where are you at? I'll have an atap soon so we could hook up then.

 

[rob]

A simple question........What was the LAST mod you preformed...... IC? Or did you drop a pulley size at the same time. Ron V has done alot of reaserch on how EGR's have to be tuned to aftermarket exhaust systems......Did you delete the EGR?.....If you did,im sure you removed it from the program....Yada yada yaada.....Their are many things to consider....My theroy is the intake restriction your experiencing due to the new IC.....You always loose 1-3# of boost by putting a radiator(core) in your intake path.....No matter what brand...

If you are TRUELY not seeeing any KR and you are stumped.....ADD TIMMING...... OR BOOST....Make sure you monitor your tap......KR.....If you drop to a 2.6 you may need to increase your octane...Especially as ambient temps increase.(spring-summer)(dont get complacent like I did)..

This doesnt mean you need to run 100% 100 octane all the time....NO...AND NEVER RUN A O.T. BOOSTER!!!!!!!!!! You mix it to ambient temps and your combo(KR). My blue GTP is running 1/2 of 93 and 1/4 of 100(metho/alcohol induced)GAS CITY...With a 3.25" and no cam or IC yet.....And manages to piss my neighbors off.....0 KR-this varies on beliefs an applications...OF course...

Im on the SS of Chicago...I have one with EH perameters and palm and your welcome......You MAY just need to compinsate for your IC restriction. Be careful and balance your combo...There are many ways to do this.....

You cannot ignore the fact that there MAY be a CLUTCH PACK problem......or if not now will be one later.....Just be aware that it may be a consideration. No-matter that your car isnt bounceing of you limiter now...Happy tune

 

[LP 3800]

How many lbs did you torque the bolts to? Did you pick up that missing bolt? If I were to guess it would be a vaccuum leak. The car may not leak until you hit it with all that air. 2.8" does not sound like a big deal, but that is a serious amount of air, and it will find any imperfection you may have in your seals. Also what happened since the day you told me it was so much faster? You must of changed something after that day?