Upped The Boost

[jrocket]

Hey all

I just installed tonite a TurboTech manual boost valve that i brought recently. Hooked it all up n set it fairly low n then went for a spin. Car seemed to be goin well. Boosted it carefully just to see how much the boost went up to on my aftermarket gauge. Started off at 0.8bar max then turned it down to 0.7 bar. Seemed to go well etc.

But, i am now noticing that the valves are starting to bounce or something. It comes not always, but under high load. Its making like a psst kind of noise. Very similar to my daily driver when ya give it a gut full at low RPM and it gets rattly valves

I am fairly certain its the valves. Never had this issue before boosting it up when previously at 0.52bar. I am unsure if this is detonation or pinging i am hearing here?

I ran my car on the dyno a while ago and my fuel mixtures were off the scale in the rich (10:1 and richer). I installed a air/fuel gauge just to give me a bit of an idea whats goin on also. I see that it goes very rich now under acceleration so prob not leaning out. Can't be 100% sure cos of short band gauge.

My car has: Modified ECU

R34 SMIC

3 inch cat back

Turbotech valve

I figured that since my car is running fairly rich already, a few psi more boost prob wont hurt too much. I am thinking maybe i need to alter my spark plug gap from 1.1mm to 0.8mm or something?

Should i just reduce boost? How do others go on a stock setup with more boost?

I can use Cunsult to check whats goin on too. Might show something. Will try that tomorrow.

What are your thoughts?

[jrocket]

Hmm guessing no interest ?

[paulr33]

its detonation / pinging

[jrocket]

Dam. Figured it was My CAS was bumped up slightly by some mechanic dude to like 16 deg. I thinking i might bring it back to 15 again.

Would reducing the spark plug gap help me in this situation. I see in other threads they say 0.8mm is good for around 12psi applications?

I will reduce the gap tomorrow.

[R31Nismoid]

Its the ECU/Tune more than anything else i would imagine

Go to dyno, get a decent tune.

[Sklyn]

I recently got one of these turbotech controls and have had no prob at all. At first it seemed to spike a little but that has stopped after a day at the drags!!

running up to .9ish bar now back down to .7

I also replaced the little hose with the restrictor in it, this made more difference than the boost control!!

[jrocket]

Hmm interesting. Yeah i hope to get it on the dyno very soon. Might start by gapping the plugs to 0.8mm n see how it goes. If no change then reduce boost.

[R31Nismoid]

plug gap wont stop pinging, keep pushing it while it is pinging/detonating and you risk doing major damage to the motor.

[jrocket]

Thx. I will have to think of what to do tomorrow. Prob just reduce boost again till i get it tuned.

[joeyjoejoejuniorshabadoo]

i'd say reduce your right foot until you get it tuned

[jrocket]

LOL yeah i know. I was hoping not to have to get it tuned so soon. But yeah guess i got no choice now.

[joeyjoejoejuniorshabadoo]

cost of car / cost of tune

[jrocket]

Ok well i reduced the boost this morning to 0.65 bar. Closed the spark plug gap to 0.8 and set the CAS back to 15 deg. Also reseted the computer to see how it goes.

Car is no longer pinging or doing anything silly now. Still goes strong. Might just get it tuned now and boost it then. Will just leave at current boost setting and see how it goes for a while.

[RB30-POWER]

assume your running 98octane fuel when you boosted it up?

[LRyder]

I have similar mods, 34SMIC, and 3" turbo back on stock ecu, with a turbo tech bleed valve. I used to get lots of popping/boost cut/ or what ever u guys wanna call it, I fitted new spark plugs, that were gaped to 8mm and it fixed everything can now red line without an issue.

This might not help your problem, but it certainly fixed mine.

[jrocket]

Yes always running BP ultimate. Cars been goin very nice without any hick up's. Starts better too and sounds quieter and smoother on idle. No Popping or issues like that. Smoother power delivery too.

[jrocket]

Hmm well i got a Dyno run done this morning on my car. The cars not running lean at all as i was worried about. Infact its far the oposite. It runs so dam rich they couldn't read how rich. was below 10:1 ratio under acceleration. Cruising was fine tho. Car didn't make as much power as i hoped, but still not bad. Originally when i first got the car it peaked at 211 rwhp but it managed 235 rwhp this time. Not too bad. They were telling me that it should be far better. Told me that the factory R34 SMIC was a POS. Starting to make me wonder wat to do now. I guess they wanted to try make some more sales etc so started giving me a speil about this n that.

I really not looking for massive power tho. Aiming for 200rwkw at this stage of the game. Prob gunna leave it there too for ages.

I will post a pic of the dyno run later tonite prob.

[R31Nismoid]

R34 SMIC, 200rwkw isnt a problem at all for a street car.

People telling you otherwise are full of it.

[jrocket]

R34 SMIC, 200rwkw isnt a problem at all for a street car.

People telling you otherwise are full of it.

Yeah thanks. Thats what i have read. I figured they just tryin to make some sales etc. 200KW is where i am aiming at this stage of the game. I knew these guys were full of sh!t but they have the only dyno around that i know of They wanted me to leave my car with them there too to do the run etc. Asked me if i had a lift back to work etc. I was like LOL yeah um na i think i will stay ere and watch if you dont mind. Dumb ass managed to crunch my gear box tryin to put it into reverse while still rolling forwards. Hmm maybe no one told him there is no syncro for reverse gear?

Ah well i got a few things to think about now. Car needs a tune bad i think. AFR's were bad. Running off the scale at 10:1 and richer for most of the run.