no ouch here man, im going with a 7600rpm redline. and the .81 ar is not going to make much significant time to spool . .81 ar is a jack of all trades on the 6765 billets.

 

I;m just sayin. Hopefully you have driven in a VQ that takes 5000 rpms to spool? Thats not fun at all for a street car.

But no one really knows what real spool will be until a full tune is done.

 

ya, full tune is the key. I think in low range I was only at 8* timing and this is on spring so it'll spool faster on boost controller.

took it out again today and set the boost controller to 14.5 psi and it overboosted to 15 psi again. I checked all my connections and the haltech and it's wired ok. I checked the continuity of the wires. Something I'm putting for the controller isn't working correctly

 

hey binder how does the 6765 sound? im very curious. hopefully you can share some videos with us.

 

well, truthfully in vac i can't hear anything at all. My borla pretty much silences it. All i hear running is my cjm twin pump when i'm cruising around. Until i hammer the throttle down i hear nothing. THen it sounds awsome for about 3 seconds while it spools to 14.6psi (wastegate pressure) and then the world ends with the wastegate opens. i'm going to find a way to run a closed dump because my left ear was ringing all last night from the open dump (i had the windows down in the car).

my timing is pulled back because i'm nervous so the spool time is actualy quite sucky. 1 bar is taking 5k to spool which isn't normal. I guess you'll have that with only 8* timing in the midrange though.

I figured out the boost controller but i can't play with it too much since my spring is already at 1 bar.

I have a chance to trailer my car over this week and leave it at injected and have them "work it in". I think i might go for that because aug 28th is the soonest otherwise i can get in.

depending on how much timing changes spool time (which i hope is a lot) i'm probably sticking with the .68 a/r and soon switching to a twin scroll with a spool valve. I think the timing is really affecting the spool though.

 

You would think that with retarded timing and the associated higher egt's that come with it that you would actually spool quicker.

 

really? but wouldn't the engine be far from peak output with retarded timing therefore reducing flow and reducing spool?

i don't think i have any leaks anywhere. I'm holding 14.9 psi steady without any issues.

 

Exposing the wastegate to atmosphere (instead of boost) will definitely help the spool though.

binder, are you running open loop boost control? Just set it at 50% at idle (not hooked up to wastegate) and see if you can hear it click.

 

raj, what do you mean exposing it to aatmosphere? I have the solenoid setup the normal setup way. I'm in open loop last night and got it to wrk. The only issue is my spring is 1 bar so I have to hold it closed past that to tell if I'm working prperly. That's high boost untuned. I have timing way back which is then killing my spool also. I used 12% duty cycle last night. I'll slowly increase it tonight to test further.

 

Ok, so it's working - sorry misunderstood. What was wrong?

By exposing to atmosphere, I meant using an EBC. The solenoid can expose the wastegate to atmosphere until the turbo is fully spooled, and then expose it to boost so that exhaust gases start dumping. With a 1 bar spring, you're kind of stuck - can't go any lower, but you can probably improve spool by keeping duty cycle at 0 (or 100 depending on how you plumbed), until the rpm when you hit 15 psi, then flip it. You'd need to tweak to make sure you don't get a boost spike. So if right now you get full spool around 4800, keep the solenoid FULL on until say 4000, then full off and let the spring do it's work.

 

If he wired it like the instructions said, then it is exposed to atmosphere. I believe he is using the Mac valve, same as me.

As far as boost goes, you will always see a bit more than your spring is rated for as the turbo comes up to full spool.

With an 8.7psi spring, I hit 9.0psi at 3700rpm, and then it tapers off to spring pressure. It is the time it takes the valve on the wastegate to fully open.

If you had boost creep issues, you would see 17+ psi on spring pressure. .5psi is nothing to worry about.

 

ok, gotcha. i think with my internal wastegate blinders on.

 

got it, i think i'll play with duty cycles. 100% is fully open so it would force my w/g shut. I'll set it to that until 4k and then 0 after that and see how we do on spool.

sasha, the w/g has only a single 1 bar spring so i couldn't lower it. :*(

i'm sending you an email with some other info from last night.

 

Thats a huge turbo.

8* in the midrange is pretty standard as 12* on pump WOT is fairly normal as well.

But Chris@fsp is right, tuner often tune rich with a low timing to increase spool bc it raises EGT's. How you spool now, is pretty much how its gonna spool, thats why I suggest ball bearing and twin scroll to start with...

 

interesting. crazy that the same turbo is spooling faster when tuned on the intense setup. 4088r has almost exactly the same compressor map as the 6765. That's also compared to a 6765 in .81 ar and i'm .68 ar.

larry at SP informed me the the BB spool time on that truthfully wouldn't change my spool a significant amount until i was running high boost (25+). twin scroll is going to be a better option with the spool valve. I'm also not getting my boost controller fully optimized yet so that should help too. This is still on spring pressure.

and rich, i'm on a 9:1 compressio motor, 8* midrange and 12* WOT seems really low when hal tuned me on the vortech at 21* up top at 14.5 psi. Midrange i'm not sure how to tune since the vortech couldn't boost that high at low rpms. from all the maps i've seen on built engines 8* is way low for 5k and 14psi area. Maybe i'm wrong though

 

You're fine I think. Too low is just as bad as too high. str8dum1 has been "spoiled" with 30 psi boost pressures! Once you get everything mechanically working, I'd definitely get it pro tuned and start enjoying the BOOST!

 

my pump gas is only 12* at WOT. guess how conservative or aggressive you want to be. my vortech was 17* at WOT. I'm not even pushing 17* on my race gas tune at 900DD

where did you see a PTE6765 compressor map? Which Intense setup are you referring to?

I bet waiting for that full tune is killing ya now. Be interesting when Jtran posts up the sheet from his twin scroll 4088

 

+1

I just emailed him the same thing about timing.

 

but on the very good side, that turbo should make some big horsepower if its really not spooling til 4800-5000.

Pretty sure you said you were going to run to 8500-9000 rpms, so you'll still have quite a powerband!

 

Sounds like the smoking issue is gone, so now it is just a matter of geting it to the dyno.