stock b16, ctr cams, victorx, 3" turbo back, 750cc inj, profec b spec 2. I'm getting 10 psi around 4.5-4.6k rpms. I thought this turbo would spool a little faster. I have my manifold coated also. What else can I do to help out spooling this thing?

My settings on my profec are (8.7 psi spring)

set boost 3%
Gain 6%
start boost 8 psi

 

you can't ask for much more than 3500 rpm's of powerband without revving to 9k

looks good to me especially at only 10 psi

only thing i could think of is if you absolutely want it to spool faster you could try a .48 hotside but i wouldn't

 

Turn the boost up, then maybe it would hit 10lbs sooner.

 

Just look at the curve of the graph, just like N/A. what more can you ask?

 

i'm just looking at different setups and some people get the same spool with larger turbos. I guess I was just expecting to much from this turbo. It does feel like a BIG na motor though.

 

Best solution would be to build an LS shortblock and toss that in.

Honestly if you plan on keeping 300-325whp, you might want to look into a GT28RS or similar. That compressor is good for close to 400 (rated at 420 by garrett), so its not even close to its peak. 2.5bar sensor + GT28RS@18psi FTW.

 

Yup you a have little B16 I would be happy with that. Give it 15 psi and you will be smiling.

 

.48ar T3 turbine housing is equivalent to the .64ar T25 housing it originally was designed with from Garrett, and would definitely drop several hundred rpm off the spool time.

You could also turn up the boost and maybe increase the gain on the boost controller; nice graph though. Any pics/vids?

 

I'd try turning up the gain also. Some have reported the victorx hurts spool b/c of it's large plenum also.

 

maybe my boost controller isn't even doing anything because the set boost % is so low. I was looking at my dyno again and it starts at 8.5 psi but creeps up to 10.5

 

Yeah, I noticed the same thing. You could turn up the gain to the point where it ramps up fast enough to "overshoot" your target boost level by a bit, ie spools fast and passes 10psi hitting 11-12psi for a moment, then settles back down at your target of 10psi.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by batboyvaj &raquo;</TD></TR><TR><TD CLASS="quote"> I thought this turbo would spool a little faster. I have my manifold coated also. </TD></TR></TABLE>

First misconception about ball bearing turbos is thinking that they would spool signifcantly earlier. Nope, a size reduction in turbine housing can probably change the spool time more.

Second misconception is thinking GT series ball bearing turbos spool way faster than the non BB turbos. It spools faster, but that's not what you buy a GT-series for. The GT-series turbos are really well known for their amazing response at a wide range of RPM and boost levels. The reason why your car feels like a big NA motor is from the increased turbine flow across a wide range of turbine speeds (yet lag hasn't increased). A regular non-BB and non-GT turbo would lag like hell with similiar turbine flow and compressor size.

If you want early spool, you might as well get a T3/T4 57-trim, and shrink the hell out of the turbine housing so you get mad spool from 3000-4000RPM. But it's going feel like a load of crap anywhere you hit the throttle between shifts, or even booting around town with lots of fluctuations with throttle position. It sure won't feel like anything close to a bigger NA motor, that's for sure

Lastly, what's your exhaust setup? Stock cat, 2.5" exhaust, etc? Or 3" straight, no cats, etc? The exhaust setup alone can change spool time +/- 1000RPM in most cases.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LeGeND4LiFe &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, I noticed the same thing. You could turn up the gain to the point where it ramps up fast enough to "overshoot" your target boost level by a bit, ie spools fast and passes 10psi hitting 11-12psi for a moment, then settles back down at your target of 10psi. </TD></TR></TABLE>

Try not to "overshoot". That spiking could have some catastrophic results if the exhaust stream isn't properly channeled, or the car is not tuned well. you can change the start gain to work with the gain of the boost controller to keep it from "overshooting". Find that balance to have the response of the turbocharger work FOR you.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tony the Tiger &raquo;</TD></TR><TR><TD CLASS="quote">

First misconception about ball bearing turbos is thinking that they would spool signifcantly earlier. Nope, a size reduction in turbine housing can probably change the spool time more.

Second misconception is thinking GT series ball bearing turbos spool way faster than the non BB turbos. It spools faster, but that's not what you buy a GT-series for. The GT-series turbos are really well known for their amazing response at a wide range of RPM and boost levels. The reason why your car feels like a big NA motor is from the increased turbine flow across a wide range of turbine speeds (yet lag hasn't increased). A regular non-BB and non-GT turbo would lag like hell with similiar turbine flow and compressor size.

</TD></TR></TABLE>

Couldn't have been said better.

 

i got a 3" all the way back no cats

 

I noticed that my turbo would spool up faster after I wrapped my manifold and downpipe with the thermal wrap.

 

i guess it would help if my boost selenoid was actually pluged in eh? HA....those damn little wires came out of the harness so my selenoid was just there with no control from the main unit.

once i hooked it up, my boost goes straight to 10psi without stopping at 8.5 first then creeping up.

 

lol glad to hear you found the culprit....what rpm are you hitting full boost at now?

 

heat spools the turbo as well, it looks like you could pull some fuel out in the lower rpms

 

i get all 10 lbs around 4,400 now. before it would just creep up to 10 psi. I will try to take fuel out of the lower range. Thanks for the tip

 

Do you have cam gears? After I put in my CTR cams and had the gears adjusted the car spooled about 500 rpm earlier. I guess it could be just the change in cams that did it, I went from GSRs to CTRs, but I have a feeling it was the cam gear adjustment. This was on a B18C1, so your results may vary...