#67360 - 07/01/05 04:27 PM
Re: knock retard on my GT
|
Member
|
Registered: 03/26/03
Posts: 2481
Loc: Franklin, MA
|
|
There's no difference in the detergents in regular or premium. It can actually hurt the engine if you use a higher octane than the car requires. High octane is NOT better gas, it simply has more chemicals that resist explosion.
|
|
Top
|
|
|
|
|
#67361 - 07/02/05 12:03 AM
Re: knock retard on my GT
|
Member
|
Registered: 07/29/04
Posts: 1563
Loc: Ohio
|
|
_________________________
 [GONE] GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.
|
|
Top
|
|
|
|
|
#67362 - 07/02/05 12:30 AM
Re: knock retard on my GT
|
Member
|
Registered: 07/11/04
Posts: 363
Loc: Omaha
|
|
Thats way more than I ever wanted to know about octane. Interesting though.
_________________________
'97 Grand Prix GTP Coupe 36k miles Currently - Wizaired CAI, Intense PCM, 3" r/t downpipe, 3.4" QC pulley, Super 40 Flowmasters, NGK TR55XI spark plugs, Taylor 8mm wires, SLP tips, 180 T-Stat, throttle body spacer, exhaust sheild http://www.cardomain.com/memberpage/684818
|
|
Top
|
|
|
|
|
#67363 - 07/02/05 01:18 AM
Re: knock retard on my GT
|
Member
|
Registered: 04/22/05
Posts: 3075
Loc: Cleveland, OH
|
|
well i ran her as dry as i could and filled up with some 93. drove for 10 minutes, and checked KR at WOT and got 5-6 degrees. i'm going to assume that the computer just needs to learn the gas or something? i'll give it some more time.
-bill
|
|
Top
|
|
|
|
|
#67364 - 07/02/05 04:12 AM
Re: knock retard on my GT
|
Member
|
Registered: 07/29/04
Posts: 1563
Loc: Ohio
|
|
Also, if you replaced the PCM with a reprogrammed one, you have to do a CASE learn so the PCM knows where the crankshaft is positioned.
If you just had it reprogrammed, then you don't need to do this.
Yea, the computer will need a few miles to get used to the new octane. Check it after a few more days. If you are still getting knock, you probably want to upgrade the exhaust to free up some back pressure.
_________________________
[GONE] GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.
|
|
Top
|
|
|
|
|
#67365 - 07/02/05 12:16 PM
Re: knock retard on my GT
|
Member
|
Registered: 04/22/05
Posts: 3075
Loc: Cleveland, OH
|
|
still getting 5.8 degrees at wot on the way home from work this afternoon. what worries me is that the change from 87 to 93 didn't change ANYTHING yet.  waiting patiently....
|
|
Top
|
|
|
|
|
#67366 - 07/02/05 02:51 PM
Re: knock retard on my GT
|
Member
|
Registered: 07/29/04
Posts: 1563
Loc: Ohio
|
|
Did you have the U bend replaced? Won't help much but it may take it down a degree.
_________________________
[GONE] GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.
|
|
Top
|
|
|
|
|
#67367 - 07/02/05 03:48 PM
Re: knock retard on my GT
|
Member
|
Registered: 05/23/03
Posts: 8078
Loc: Austin, TX
|
|
Put the stock PCM back in and see what kind of KR you read. 
_________________________
Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.
|
|
Top
|
|
|
|
|
#67369 - 07/09/05 10:48 AM
Re: knock retard on my GT
|
Member
|
Registered: 04/22/05
Posts: 3075
Loc: Cleveland, OH
|
|
well after 8 days of running 93ish, it didn't help... its actually worse. now its giving me 6.5 degrees KR! probly throw the stock pcm in after an upcoming trip (not me driving). anyhow, that doesn't seem like a solution...i like my intense!
|
|
Top
|
|
|
|
|
#67370 - 07/14/05 02:40 PM
Re: knock retard on my GT
|
Member
|
Registered: 07/29/04
Posts: 1563
Loc: Ohio
|
|
Any update on this? I am questioning the AeroForce reading.
See if someone else has a scan tool. Surprised to see a PCM do THIS to a car.
Plus if you put in super and you are getting more, then there is something wrong with the car itself such as plugs, fuel filter, dirty throttle, e.t.c.
Downpipe may help.
_________________________
[GONE] GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.
|
|
Top
|
|
|
|
|
#67371 - 07/14/05 04:06 PM
Re: knock retard on my GT
|
Member
|
Registered: 06/29/05
Posts: 84
Loc: Omaha, NE
|
|
You lucky asses
There's only ONE station that sells 92...everybody else has 91 .. And it sucks
Somebody said AutoZone or someone will Scan for KR for free??
_________________________
COMPETITION CAMSHAFT STAGE 2, 105 lb Valve springs, new Pushrods, new retainers, 4" Fenderwell Intake, 3" DP with High-flow Cat, Borla Cat-Back, 3.2" Pulley, Shift Kit, 160 T-stat, DHP PCM 1.0, Tranny Cooler, Taylor Wires, Colder Plugs
|
|
Top
|
|
|
|
|
#67373 - 07/14/05 04:37 PM
Re: knock retard on my GT
|
Member
|
Registered: 09/12/03
Posts: 14035
Loc: Fort Worth, Texas
|
|
Originally posted by Kwik Wun:
You lucky asses
There's only ONE station that sells 92...everybody else has 91 .. And it sucks
Somebody said AutoZone or someone will Scan for KR for free?? That's because of your altitude. At that elevation 92 is like 94 for us here at sea level.
|
|
Top
|
|
|
|
|
#67374 - 07/14/05 06:27 PM
Re: knock retard on my GT
|
Member
|
Registered: 07/29/04
Posts: 1563
Loc: Ohio
|
|
Originally posted by HercMan: Originally posted by Kwik Wun:
[b] You lucky asses
There's only ONE station that sells 92...everybody else has 91 .. And it sucks
Somebody said AutoZone or someone will Scan for KR for free?? yup.
_________________________
[GONE] GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.
|
|
Top
|
|
|
|
|
|
Previous Topic
Index