Need Advice

[blitzxtr]

Hi there peoples have a problem not sure if i have detonation or a misfire been having excessive blow by but its been doing that since i had a track day didnt have a problem with pinging or misefire if thats what it is. as soon as full boost hits its wierd sound in one sense it sounds like misfire and then it sounds a jar of ball bearings rattling can some one shed some light on issue

[tmc_2]

Hi there peoples have a problem not sure if i have detonation or a misfire been having excessive blow by but its been doing that since i had a track day didnt have a problem with pinging or misefire if thats what it is. as soon as full boost hits its wierd sound in one sense it sounds like misfire and then it sounds a jar of ball bearings rattling can some one shed some light on issue

the jar of ball bearings i would guess is pingin gor detonating. Thats very bad. Id consider lowering the boost and make sure u run high octane petrol. If that doesnt minise it try taking timing out. Realyl ur best option is to go to a reputable skyline tuner and have it cheacked.

[Abo Bob]

What mods? What boost? What fuel?

[blitzxtr]

What mods? What boost? What fuel?

Mods are engine rebuilt arias pistons shotpenned rods fully balanced

microtech

sard 850cc injectors

hks cams 256 264

hks to4z

eboost settings at 17 20 25 psi

running mobile 8000 with 104 octane booster

never had detonation before on all three boost settings

[tridentt150v]

Old chestnut as they say but..........fuel pump failing?

Det is from running too lean, timing to far advanced or carbon hotspots on the pistons [igniting fuel before your sparkplug does].

[Guilt-Toy]

take it to a dyno and get them to put a fuel pressure tester on and do a power test to see whats going on.

If you dont you will blow your engine to pieces.

BTW if you have blow by allready then you could have smashed some rings. do a leak down test.

my engine had lots of blow by and when i pulled it down 5 pistons had cracked / broken rings

Edited January 10, 2007 by Guilt-Toy

[blitzxtr]

take it to a dyno and get them to put a fuel pressure tester on and do a power test to see whats going on.

If you dont you will blow your engine to pieces.

BTW if you have blow by allready then you could have smashed some rings. do a leak down test.

my engine had lots of blow by and when i pulled it down 5 pistons had cracked / broken rings

Had a leak down test three weeks ago all cylinders except for two were at 15% the other two were at 55 60%

[blitzxtr]

Old chestnut as they say but..........fuel pump failing?

Det is from running too lean, timing to far advanced or carbon hotspots on the pistons [igniting fuel before your sparkplug does].

when i had it dynoed the fuel pump was maxing out took the fuel return line off nothing was going back that was at 25 psi

[Guilt-Toy]

looks like those cyl are leaking boost into the sump causing the blow by.

id look at re-ringing it and checking the pistons.

[blitzxtr]

looks like those cyl are leaking boost into the sump causing the blow by.

id look at re-ringing it and checking the pistons.

Ill be doing that in next few weeks pulling engine out putting total seal iron rings good for hi boost apparently changing rods to to argo rods get them real cheap $800 new replace bearings probably acl and get head flow tested and ported to suit the flow of hks t04z then change to surge tank and dual fuel pumps.

If all goes well hope to crack 400 rwkw fingers crossed

[gun32gtr]

Ill be doing that in next few weeks pulling engine out putting total seal iron rings good for hi boost apparently changing rods to to argo rods get them real cheap $800 new replace bearings probably acl and get head flow tested and ported to suit the flow of hks t04z then change to surge tank and dual fuel pumps.

If all goes well hope to crack 400 rwkw fingers crossed

sounds like a good setup. make sure ya let us no how ya go