Thread: New member with Ka24 DET people carrier.

I like it! There is only one Nissan van that came out here in the states that I liked and you can't find them anymore

These were not available in the UK either, Jap import 2.4 Petrol or 2.0 TD. 150bhp for petrol 95bhp TD or this version with 422whp 483 lbs. I also got the 95bhp one as well

we had a nissan access van in the shop the other day.

Slow pull away just over 65mph, around 50% throttle, not using full rev range.

This is the one I was talking about

300 HP: SR20DET Swapped 1987 Nissan Van | Bring a Trailer

Sounds pretty decent during acceleration actually.
MASSIVE compressor surge though, obviously. I'd put a BOV on there... =/

Just been reading up on surge, so this is when the turbo is making more air than the engine is consuming nothing to do with the noise on lift off?Unfortunately not got a log of this bit of acceleration. Was not anywhere near full throttle just using torque of engine, lifted off as well to get it to change gear. Not sure if there was sarcasm in having a blow off valve AKA ricer :-) there is one on there. Just about see it in the picture, also has screamer pipe. I think I am missing out on so much on this car it is quick but could be quicker but now concerned on how long it will live with compressor surge?

Found a link http://www.frozenboost.com/stpg.php?page_id=bov

So is it the bit when I lift off and I get the duff duff duff duff duff noise, so I need to adjust the greddy rs to be a looser spring pressure?

cheers

Correct.
There are two instances where this can happen.

1) The throttle is open, and the turbocharger is pushing more air than the engine can consume so the air reverts back into the compressor blades. I like to call this loaded surge. This is extremely harmful. This is very rare.
2) The throttle is closed, and the turbocharger is pushing more air than the engine can consume so the air reverts back into the compressor blades. I like to call this lift-throttle surge (or unloaded surge). This is a bit less harmful. This is very common on cars with improperly configured or completely missing BOVs.

See #2 above. When you lift, where is the compressed air supposed to go?

I've never seen a turbocharger with that level of surge last more than a season. I say you have 3 months?

No sarcasm. You have so much lift-throttle surge I just assumed you didn't have a BOV. I would wager yours is not connected to vacuum properly.

Yes, exactly.

Maybe. Adjustable BOVs are just about the stupidest thing I see on a regular basis. No one knows how or why to adjust them, and they just make things worse. I don't have time to get into how to adjust one properly. Just take the easy way out and keep backing off the spring pressure until you NEVER hear that chuff noise again.

Thanks very much, will get on with adjusting to be closed under peak decceleration vac.

Had the seats and transmission tunnel out so spent some time on the BOV. Took out secondary spring and set in the ballpark, however even with the screw wound right down I was passing. So reinstalled 2nd spring put ptfe on threads and went for drive with engine covers off and drivers seat balanced on wood! I sit right next to bov and it seemed to be working better letting out mildly on lift off when not generating positive pressure (not sure if this is correct) and when making .5bar on lifting off it almost took my hand off However still seemed to get a bit of surge on gearchanges when pulling lightly(automatic). Time was getting on so left at that put covers back on but now seem to have a bit more lift of surge with the covers on. Maybe because I was sitting on the engine driving obviously other things are quite loud but certainly it seemed to be working when holding my hand near under all conditions. There is quite a bit of freespace with the covers on so dont suspect it is reverbarating off the covers. Doesnt make a difference that it is an open screamer on the wastegate as assume this is only open under high boost (worth a check).

cheers