some 20v questions (high idle, rattle etc)

[gmacrae]

Just got the silvertop with its 5spd running in my ae92, seems to go well but i've just got a few questions for you 20v gurus:

1) my warm idle is around 1400-1500 rpm - i understand there is no idle adjustment on this engine. I have set the timing to 10deg with TE1+E1 shorted, I plugged/removed all vacuum lines from the vac chamber thing on top of the itb's (no p/s, no aircon). Whats the deal with getting this idle back to 800rpm?

2) This engine has quite a noticable top end clatter/rattle - very noticable at idle (though it's supposedly done under 100ks). I've heard the VVT pulley sometimes causes a rattle, also worried about excess cam/bucket clearance. What's more likely? If its the VVT pulley, whats involved in shutting it up? Just a new replacement pulley?

3) who's tried using a blacktop ecu and map sensor on a silvertop engine? How did it go?

Thanks for any help

Gene

[deaf_rattle]

silvertops do sound like diesels at the best of times, any chance of a audio clip of how yours sounds? its probably fine.

As for the idle, i had some problems with mine, but it seems to be timing related. have you checked tension on the cable?

[gmacrae]

silvertops do sound like diesels at the best of times, any chance of a audio clip of how yours sounds? its probably fine.

As for the idle, i had some problems with mine, but it seems to be timing related. have you checked tension on the cable?

Cheers for the reply An inherantly clattery engine eh? Never knew that, hardcase. I cant really get a sound clip up, but its definitely top end noise, deisel is really the best way to describe it (well not quite that bad). I'll check the valve clearances sometime in the next few weeks.

Checked tension on the accel cable? Yea its definitely letting the throttles snap shut. Idle sits around 1000rpm on a cold start, slowly rises as it comes up to temp.

[deaf_rattle]

yeah, when i test drove the donor vehicle it sounded like that(i was assured by Lee that they are all like that) so i bought the engine.

Just saw Davids conversion (toymad) and his engine sounds exactly the same.

Ive run my silvertop low of oil several times now (leaking and burning oil) and over heated it badly twice (once the radiator was completely empty) and the engine is still good.

Cant believe how reliable these motors are.

I wouldnt worry about the noise. there was a sound clip somewhere of what a faulty pulley sounds like, but you would know in a hurry if that were the case.

As for the idle, you might need to adjust the tps or check for vacuum leaks or something like that.



The wierdest thing happened to my fxgt, i took a rattley exhaust shield off and now the whole tone of the exhaust is different. It sounds pretty good now, except for a nasty tinny spot at about 4000rpm.

I think the rattle mustve been cancelling out some of the noise.

[gmacrae]

Wonder why toyota couldnt get the head tighter and quieter. Seems a bit slack for them to leave it to rattle

Tps eh, hmm, will investigate.

[Mr Revhead]

they arnt excessivly rattley....

as mentioned the VVT pulley can knock.
shold sound like an average early 90s engine really

[85AW20v]

If you're down in Taupo, give me a yell and you can have a listen to the 20v in my AW if you like.

[Lloyd]

As Revhead says, they aren't really a noisy engine. The pulley if stuffed will make a bit of a noise which I found to be more noticeable at idle or very low revs than anything else. If it sounds like a diesel then something isn't quite right.

[deaf_rattle]

As Revhead says, they aren't really a noisy engine. The pulley if stuffed will make a bit of a noise which I found to be more noticeable at idle or very low revs than anything else. If it sounds like a diesel then something isn't quite right.

Warwick is admitting they are rattley.... just not overly, but thats all about perspective.

All silvertops ive heard have had a distinctive sound to them, i have heard the clip of a crapped out vvt pulley and its not that sound.

Think you will find that they are noisy compared to alot of other engines of similar age.

It doesnt sound like injector sound. and its not bearings. even well looked after engines with 100000kms on have sounded the same.

But without hearing a clip i cant make any further comments.

[matt dunn]

well,

after chasing similar problems and bit's and pieces on a car at work for a few days off and on last week,

Dont fiddle with any of the ITB adjustments,
Make sure the TPS idle contacts are closed
and set the ign timing.

Then search for an air leak.

The I chased ended up being a vacuum hose off the VSV on the power steer rack.

Once I plugged the vac line back on it was all perfect again,
(after I had rest the AFM and stuff I had fiddled with).

Matt

[gmacrae]

Compared to the old redtop, the silvertop definitely is rattly... Righto, found the tps specs, will check that also. And probably replace all the vac line caps i've made from hose and bolts - hopefully there's a slight leak in there somewhere.

How about the 3rd question.. anyone used a blacktop ecu and map sensor on their silvertop with good results?

[Santa'sBoostinSleigh]

How about the 3rd question.. anyone used a blacktop ecu and map sensor on their silvertop with good results?

not 100% certain here, but the fact that the BT and ST have dif injectors, lift/duration and different compression, im sure that it wouldnt be that simple

[sergei]

Black top and silver top have same sized injectors, very similar engines, and generally should run with either ECU setup no problem. You will not gain anything by running MAP system on AFM-ed engine or vice versa.

[gmacrae]

Black top and silver top have same sized injectors, very similar engines, and generally should run with either ECU setup no problem. You will not gain anything by running MAP system on AFM-ed engine or vice versa.

Thanks to your post about the injector differences Sergei, i just picked up some blacktop injectors for mine Will have them cleaned before they go in. I understand the small differences in cams etc and that changing to a map'd ecu will likely not gain anything at all (though with an safc or something, could def help)... i just want to let those itb's sing if it aint gonna cost much

[deaf_rattle]

Black top and silver top have same sized injectors, very similar engines, and generally should run with either ECU setup no problem. You will not gain anything by running MAP system on AFM-ed engine or vice versa.

Thanks to your post about the injector differences Sergei, i just picked up some blacktop injectors for mine Will have them cleaned before they go in. I understand the small differences in cams etc and that changing to a map'd ecu will likely not gain anything at all (though with an safc or something, could def help)... i just want to let those itb's sing if it aint gonna cost much

id be keen to see how you get on, ive bene thinking about that as well.
i wonder if you can get demerits for excessive induction noise

[Dragger_Dan]

I'm running blacktop computer/loom/map on a 20v silvertop in my AW11. Runs absolutely fine. I wouldn't mind doing an an air/fuel ratio check at some stage, but it drives well enough for me to think nothing is wrong.