rowingryan

It started doing this before the rebuild (Thats why i decided to rebuild it). It was a intermittent problem at first. I've had it on the computer at work (Wadsco Motor World) & found no problems what so ever. I had the shortblock assembled at a shop & the heads checked over at the same place. Did the rest myself. I also wired the wastgate shut with no change.( would just hit boostcut & then do the same thing again.) At the time of the rebuild I replaced all the gaskets & seals, checked the boost lines etc. The exhaust is 3inch from the turbo back with a siamese pipe for the wastegate. Doesn't seem to be blocked. If I pressurize the inlet manifold on the car i get air coming back out the idle control valve but thats at 110psi. Will try a few things & see how it goes. Any more ideas throw them at me! Getting beat by my mates s14 turbo at the drags was shameful!!

Have changed coils & fitted new iridium plugs at the time of rebuild 20k ago. it had this problem before i rebuilt it. also changed the turbo to a vf23 with no change.

Hi guys I've had this problem for a couple of years now & havn't been able to figure it out. It drops boost at 4000rpm to 10psi & feels realy flat & sounds like it has a masive boost leak but i can't find one. If Im doing 80k in 5th gear & floor it it will boost 14-15psi & hold it till 4000rpm. I've been told to check the map sensor & pressure exchange solenoid. Anyone else had a similar problem?

I jst did a compression test & got 130psi all round. Does that seem about right? & judging from the ngk site my plugs are burning perfectly. well not perfectly but u no wot i mean

Yea i just pulled my plugs out but they seem to be burning cleanly. Ill try changing them to genuine 1s & c how it goes

o ok i havnt realy had much to do with v1-2 cars apart from my v2 ra v-ltd. go to town on the thread then. im always up for learning new stuff.

Hi guys ive got no intake leaks the computer seems to be all gud & same with sensors. Im thinking it may b an exaust leak in the up pipe under the heat shield.

injectors yes but i think they ran the tdo4 turbo?

thts weird. Mine was running 14psi & went rather well 12.55 1/4 mile on my 3rd go & that was on my old tdo5h but all of a sudden it just started to drop down to 10psi & got the sound like a sandblaster would be the best way to describe it & it only starts making that sound at around 4000-4500 rpm

Just to add sum more info v1-2 ran high compression & low boost while v3 up ran low compression high boost. v1 & 2 sti wrxs also were the most heavily modified by sti from standard

Doesnt throw any codes apart frm the tps every now & then. Its not the best but it was like that well before the problem started. Ive tested the maifold for leaks & its only leaking air out of the icv to the small air box b4 the turbo. Havnt tested the intercooler or turbo to ic pipe yet & the bov seems to be fine. Yup 3" all the way with 2 hotdogs & a cannon. Dont wana change it eitha coz its got a more race car sound than droney. Ill do some more testing tomorrow & get back to u.

Hey guys just goin over some things on the car. if the knock sensor is falty would that retard the timing etc enough to cause the problems im having?

Aaah good point. 1st & 2nd in my car are realy short (3.900) diffs so the turbo probly doesnt have the time to spool that high.

Thats what i thought but why would it hold boost in 3rd,4th & 5th? ill have a good look over it at work or on the weekend & c how it goes. Thanks

Hi guys. Ive had a problem with my boost for awile now & its realy starting to piss me off. It will start to boost properly & then at about 4500rpm it sounds as if its pushing alot of air or exaust out somewere & feels realy flat (not getting pushed into the seat). Ive now wired the wastegate shut & im still getting the same problem in 1st & 2nd but 3rd,4th & 5th i can hit boostcut no problem. Ive checked for exaust leaks & the turbos mint. Its also not throwing any codes eitha the throttle position sensor isnt the best & its using alot of fuel & backfiring alot Any help would be great. Some specs are vf23 turbo greddy type rs bov rebuilt motor 10k ago 3" from turbo back with a Siamese wastegate pipe. Trust/Greddy boost tap