R33 Gtst Missing At High Revs. Sluggish

[boostdef]

Hey Guys,

Heres the story.

Changed the motor in the r33 and replaced it with a S2 motor, using the s1 coil packs and wiring harness.

Now under load and above 4000rpm it is missing and popping quite a bit. The s1 coil packs which are being used were working perfectly fine before the motor change.

I have changed plugs with new NGK Bcpr6es gapped at 1.1 . Beforehand it was missing at all rev range, now its just missing above 4000rpm.

Boost gauge is showing about 0.4 - 0.5 bar, HOWEVER, the turbo seems to be sounding like it is spooling quite a lot more than before the motor change. (Alot more whistle).

Possible causes is that I have hooked up the vacuum lines wrong? (The s2 motor has some different vac setup). But there is no hunting at idle and its not running rich?

Also, there is a really small vac hose at the rear of the inlet manifold, I cannot find where this once went?? Its about a 3-4mm diameter. Could this be the cause and if so, where does it go lol Im shocking..

I know alot of you will say coilpacks, based on what the search has showed me. But I would like to tackle some other areas first before i go fork out for some splitfires!!

Any help would be muchly appreciated

[Benzino33]

Hey Guys,

Heres the story.

Changed the motor in the r33 and replaced it with a S2 motor, using the s1 coil packs and wiring harness.

Now under load and above 4000rpm it is missing and popping quite a bit. The s1 coil packs which are being used were working perfectly fine before the motor change.

I have changed plugs with new NGK Bcpr6es gapped at 1.1 . Beforehand it was missing at all rev range, now its just missing above 4000rpm.

Boost gauge is showing about 0.4 - 0.5 bar, HOWEVER, the turbo seems to be sounding like it is spooling quite a lot more than before the motor change. (Alot more whistle).

Possible causes is that I have hooked up the vacuum lines wrong? (The s2 motor has some different vac setup). But there is no hunting at idle and its not running rich?

Also, there is a really small vac hose at the rear of the inlet manifold, I cannot find where this once went?? Its about a 3-4mm diameter. Could this be the cause and if so, where does it go lol Im shocking..

I know alot of you will say coilpacks, based on what the search has showed me. But I would like to tackle some other areas first before i go fork out for some splitfires!!

Any help would be muchly appreciated

u tried taping the coils up with electrical tape? that stops sparks escaping out of small hairline cracks on ur coils at high rpms.my series 1 always used to do that, i tape it up,,redline beautifully.either that or try using series 2 coil packs coz theyre different,,

good luck chuck

cheers

ben

[2LV8ETR]

Series 2 coilpacks have the igniters built in to them. You shouldn't run them on a Series 1 engine.

If you have a mate with a Series 1, borrow his coilpacks and see what happens.

[boostdef]

Its a S2 engine, using the S1 coilpacks and S1 wiring/ecu etc.

Will try the tape i think. But the turbo noise is waaay different than beforehand.

Are S1 and S2 turbos different at all?

[FLN75S]

Its a S2 engine, using the S1 coilpacks and S1 wiring/ecu etc.

Will try the tape i think. But the turbo noise is waaay different than beforehand.

Are S1 and S2 turbos different at all?

Try gapping the plugs at 0.8mm most Skylines will miss running standard coils with a gap of 1.1.

I believe that that the series 2 turbo's are different using different inlet and exhaust wheels.

Also if it sounds like its running lots of boost on the standard ecu it could be hitting boost cut.

[EliSun]

Try gapping the plugs at 0.8mm most Skylines will miss running standard coils with a gap of 1.1.

I believe that that the series 2 turbo's are different using different inlet and exhaust wheels.

Also if it sounds like its running lots of boost on the standard ecu it could be hitting boost cut.

THIS.

Plugs need to have 0.8mm gap.

My factory standard S2 was missing above 5000 on factory boost (low-hi mode = 5-7psi)

changed to BCP6RES-8 (BCP6RES-11 = 1.1mm gap)

if you cant find BCP6RES-8, just look for BCP6RES, pull it out of the box and either measure or compare it to a -11.

provided your coil packs and leads are good, there's no other reason why it'd be missing above 4000rpm.

People told me all sorts of things like new coil packs ($800 for splitfires?), fuel cut etc.

changed to a set of six $6.00 BCP6RES spark plugs and problem magically solved.

also dont but platinums or iridiums, plain copper is fine for mildly modded engines provided you change them every 10,000kms or so.

Edited May 7, 2009 by EliSun