Thread: kr issues

ok so heres the deal, ive got lots of kr...up to 15 degrees but only under 3k above that and i have 0 all the way to 100mph, then it comes back at around 6 to 8.

Mods
-gen v on 3.4 mps
-headers
-1.8 slp rockers valve springs from ls2
-custom tune(supposedly it can be alot better)
-northstar tb and LS maf may be the other way around cant remember
-aeroforce interceptor, and boost guage

If you are looking at the engine from the front I checked the middle and right piston with a borescope, and they looked good, i didnt have time to check the rest and i read these are the first to chip.

changed spark plugs and fuel filter ran seafoam in the gas

another thing i found odd was my boost the highest ive seen it was 13.5 lbs but normally around 12 i know this cant be correct on a 3.4 unless my charger is in beast mode or something lol correct me if im wrong but shouldnt it be llike 10lbs

-PLANS
im goning to take it to prj if for retune and putting a meth kit on it
i ordered a 3.5 mps for the time being

Gen V is better than a Gen 3, hence why the boost is alot higher.

That 3.4 is like a 3.2 on a gen 3.

I/C would solve a lot of your problems.

Originally Posted by jrb1027

ok so heres the deal, ive got lots of kr...up to 15 degrees but only under 3k above that and i have 0 all the way to 100mph, then it comes back at around 6 to 8.

Mods
-gen v on 3.4 mps
-headers
-1.8 slp rockers valve springs from ls2
-custom tune(supposedly it can be alot better)
-northstar tb and LS maf may be the other way around cant remember
-aeroforce interceptor, and boost guage

If you are looking at the engine from the front I checked the middle and right piston with a borescope, and they looked good, i didnt have time to check the rest and i read these are the first to chip.

changed spark plugs and fuel filter ran seafoam in the gas

another thing i found odd was my boost the highest ive seen it was 13.5 lbs but normally around 12 i know this cant be correct on a 3.4 unless my charger is in beast mode or something lol correct me if im wrong but shouldnt it be llike 10lbs

-PLANS
im goning to take it to prj if for retune and putting a meth kit on it
i ordered a 3.5 mps for the time being

Originally Posted by Sudden

I/C would solve a lot of your problems.

how about methanol

Get a real tune before even thinking about ways to reduce KR.

Up your pulley size and get it fixed.

Because I bet after its straghtend out and if there is no internal damage the car will be running good and there will be no reason to buy a $1,000 dollar intercooler setup or spend money on a Meth kit.

This car just sounds like a complete hack job that needs to be fixed before even thinking about other mods.

This ^^^

get a 3" downpipe the ubend is restrictive and since you said your boost went from 12 to 13 maybe clogged cat, more boost more flow needed, if it cant get out fast enough its going to b high psi and high kr. The stock pcms have a part throttle problem with kr i see up to 5kr cruzing 0 to 1 WOT.

^ he has headers

Originally Posted by 94GrandPrixSE

get a 3" downpipe the ubend is restrictive and since you said your boost went from 12 to 13 maybe clogged cat, more boost more flow needed, if it cant get out fast enough its going to b high psi and high kr. The stock pcms have a part throttle problem with kr i see up to 5kr cruzing 0 to 1 WOT.

Yea ive got headers and no cat so not a problem there

Originally Posted by Fivefingerdeathpunch

Get a real tune before even thinking about ways to reduce KR.

Up your pulley size and get it fixed.

Because I bet after its straghtend out and if there is no internal damage the car will be running good and there will be no reason to buy a $1,000 dollar intercooler setup or spend money on a Meth kit.

This car just sounds like a complete hack job that needs to be fixed before even thinking about other mods.

Ok Ive got a 3.5 on the way I just couldn't understand why kr would be so high under 3k rpm but zero kr the rest of the way up the power band, Also I figured if I got the meth kit now i could have my car tuned for it at the same time hence the tuner is far away from me and I work 7 days a week.

But, I think I will take your suggestion I assumed this meth kit would help me out with the kr.

Also do you have a suggestion for pulley size.

3.5 or 3.6 is better than a 3.4 as of right now.

Meth can help with KR or as a power adder, but for you, you needed to get the car running good first before putting a bandaid mod on the problem.

There must be something wrong with the data put into the PCM, you say its got a different TB and MAF, its very possible that thingys are wonky there and causing these problems.

If you have 15kr definitely go back to stock or youll get this

Have you checked sources for false knock? Being that you aren't seeing any when you're over 3k maybe you've got a downpipe hitting or shot motor/trans mounts.

Originally Posted by JaredR215

Have you checked sources for false knock? Being that you aren't seeing any when you're over 3k maybe you've got a downpipe hitting or shot motor/trans mounts.

Yea I did take the pulley belt off and I found 0 kr

Originally Posted by Fivefingerdeathpunch

3.5 or 3.6 is better than a 3.4 as of right now.

Meth can help with KR or as a power adder, but for you, you needed to get the car running good first before putting a bandaid mod on the problem.

There must be something wrong with the data put into the PCM, you say its got a different TB and MAF, its very possible that thingys are wonky there and causing these problems.

This seems very possible, I noticed today when I was driveing to work that my rail pressure only read 15 on my aero force, I didn't think I could read the pressure threw the guage is this correct

AF can't read fuel pressue.

The car wouldnt even run on 15 psi, needs 35-40 to just idle really, 45+ is the better

Originally Posted by Fivefingerdeathpunch

AF can't read fuel pressue.

The car wouldnt even run on 15 psi, needs 35-40 to just idle really, 45+ is the better

That's what I thought so it must have been a phantom reading

I figured i could give everyone an update, i got a tune from prj over the weekend and all the kr was false, had a cracked egr line. shes running pretty strong now, only problem is i havnt gotten any better than 15mpg since the tune cause i cant keep my foot out of it lol

Originally Posted by jrb1027

I figured i could give everyone an update, i got a tune from prj over the weekend and all the kr was false, had a cracked egr line. shes running pretty strong now, only problem is i havnt gotten any better than 15mpg since the tune cause i cant keep my foot out of it lol

Yay!


But


If you want better MPG buy a Prius