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Spark plug suggestions?



TDCRacing said:
With a 3.4? I'd go around 0.050
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oh alright. im not sure what they are now. i think i threw them away. and my ignition system is good. i got MSD wires and just replaced the coil packs. but should i really go back to a 3.8 pulley? even if the car seems to be running perfectly fine?
 
If you're scanning for knock and running a 3.4" kr (knock retard) free, then you're fine I guess.

The most restrictive part of the exhaust is the u-bend right behind the cat though.

-Riggs.

EDIT: You can't really tell if your car is knocking just by feel. If you are seeing knock, then the PCM will pull timing so that you don't blow up your motor.
You will be faster with no kr than you will be with kr, as the restricted timing means less power.
-Riggs.
 
BiggRiggs said:
If you're scanning for knock and running a 3.4" kr (knock retard) free, then you're fine I guess.

The most restrictive part of the exhaust is the u-bend right behind the cat though.

-Riggs.

EDIT: You can't really tell if your car is knocking just by feel. If you are seeing knock, then the PCM will pull timing so that you don't blow up your motor.
You will be faster with no kr than you will be with kr, as the restricted timing means less power.
-Riggs.
Click to expand...

alright. thanks for the info. im takin that u bend out before i drop my engine and tranny back in. i was planning on doin that anyway. and get a high flow cat too maybe when scrap prices go up cuz u can get around 140 for a stock cat at a scrapyard.
 
projectGTP said:
well what if my car is running perfectly fine wit the pulley?
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Have you had it scanned? If not, then you don't know. There's no way to tell if you have knock without a scanner that can look for it while you're driving.

projectGTP said:
i heard that every grand prix is different and some have KR when others with the same mods dont. and i dont think the dp is all that restrictive. just the cat
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As long as it isn't clogged up, the cat isn't really restrictive. The DP is horrible as far as how tight it gets (not even talking about the u-bend). The front manifold is worse. You increased the boost on the engine without giving it a way to move the air out, and I bet you have tons of knock for it.
 
Sabrewings said:
Have you had it scanned? If not, then you don't know. There's no way to tell if you have knock without a scanner that can look for it while you're driving.



As long as it isn't clogged up, the cat isn't really restrictive. The DP is horrible as far as how tight it gets (not even talking about the u-bend). The front manifold is worse. You increased the boost on the engine without giving it a way to move the air out, and I bet you have tons of knock for it.
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yeah i never had it scanned. and i was thinking about gettin the ported exhaust manifolds instead of headers since i am tight on money right now. would it be just a waste of money? should i just save up for headers?
 


Porting the front manifold doesn't really help since you can't port the part that's the tightest. The rear doesn't really need porting. Get a Plog.
 
Sabrewings said:
Porting the front manifold doesn't really help since you can't port the part that's the tightest. The rear doesn't really need porting. Get a Plog.
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whats a plog? is that power log manifolds or something like that? and how much do those run? oh yeah, and im getting my heads ported and polished(mostly just polished) by my cousin. he polished his heads on his LS1 and it looks amazing. its like rubbing your finger against glass. u think that will help any?
 
Power Log (aka PLog)

Ported/polished heads will offer a performance gain.
Most people don't do head work until a little further along in the modding game as the stock heads don't become the bottleneck until you've opened up both the intake and exhaust a bit more than stock.
Not to say that it wouldn't provide any gains at all, but there are much cheaper hp/$ gains to be had if you are running a stock setup.

One thing about porting/polishing heads: Make sure your cousin actually knows what he is doing. Bad head work can do more harm than good.

-Riggs.
 
BiggRiggs said:
Power Log (aka PLog)

Ported/polished heads will offer a performance gain.
Most people don't do head work until a little further along in the modding game as the stock heads don't become the bottleneck until you've opened up both the intake and exhaust a bit more than stock.
Not to say that it wouldn't provide any gains at all, but there are much cheaper hp/$ gains to be had if you are running a stock setup.

One thing about porting/polishing heads: Make sure your cousin actually knows what he is doing. Bad head work can do more harm than good.

-Riggs.
Click to expand...

yeah he told me all i need was the porting and polishing kit(50 bucks i think). he said i might need two kits. i think hes basically just polishing them, not porting. and the labor is free. also he gave me his stock throttle body off his LS1. its huge. i heard that they make a conversion kit for them to go on gtps.
 


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