Hi guys, sorry for my ignorance but I have no idea how to extract information from my dyno sheet beside the numbers that shown. Btw, here it is:



So my car makes 265hp at the hub and around 370Nm (270Lb/ft) @13psi. The power is linear. Torque peak is at 4500rpm and power peak is at 5500rpm after anything it drops. How can this tell anything more??

I booked my car in for a re-tune next week for 18psi. It's getting hot right now and car does not feel running 100% as it was 1.5months ago. I need to know what I can tell my tuner coz I think he OVER did the 'safe conservative timing tune' and not make the 300whp goal that I intended to at that amount of boost.

Engine: Fully Built F22B1 VTEC (CR is 7.7:1 since my arias 8.2:1 piston was milled down)
Turbo: T3/T4 0.48 AR Turbonetics
Exhaust: 2.5" mandrel bent stainless steel
ECU: Hondata s300

 

Need to see the fuel and timing maps, but I would personally find a different tuner.. I have seen plenty of midly built D series make that same power and stock B series so something is really wrong here..

also you have a low *** comp ratio..this isnt a srt I dont think you need to be in 8's..

Or maybe F series just make low power..I cant say I am the most experienced.

 

Your compression is pretty darn low for even a boosted motor. 7.7:1 is going to take more boost to make the power per say a 8.5:1 or even 9:1 motor will make on a good bit less boost, all things equal. Your going to have to run more boost to make power pretty much bottom line, good side of low compression is that it is more forgiving.

Tuning it pretty key too of course but the power numbers look about right for that turbo, CR, boost level, etc. That tiny .48 housing is going to be a killer up top btw, the backpressure is going to be pretty high when you start cranking up the boost. A larger hotside will help it carry the power a bit more up top and you will find that .48 housing holding you back alot.

As a sidenote, the f22b1 oem intake manifold is a very restrictive design. There is little options for us b1 cars as for intake manifolds, but if you PM me I can tell you what is working better for me.

I can asure you this is not the case, they are less well known motors and lacking the popularity/ support of per say a b series... however I can definately tell you with the right setup they make power. He has some other issues bottling it up.

 

It mcould possibly be the .48 exhaust housing is choking the motor out, we had a similar instance with a B16 with a similarly sized turbo. Maybe upgrade to a .63AR housing, spool will suffer a little, but overall flow will be better

 

I agree that your .48 AR housing is hurting you. It helps in the spool, but if you want the power to keep climbing, consider a larger exhaust housing. The larger AR will also lower your EGTs.

I'm running into the same issue with my car (2AZ-FE) and I'm also on a .48. My power and torque fall off like yours - so I'm stepping it up to a .82 - but I also have 2.4L.

 

One problem is the dyno sheet itself - it makes the power drop seem far worse. Seems that every non-USA dyno opperator sets the min/max scale oddball numbers, and abreviates the lower scale.

Anyways it's not too bad for an F22, but like others said, a .48ar housing is just plain small. A .63ar would make it lag a few hundred rpm's, but with a much better top-end. The other thing is you don't list the compressor's size. For all we know, it could be a t04b S-trim wheel, which would max out a tad above 300whp. If it was a t04e 60trim wheel, it could near 500whp.

 

why does no one set force scaling on their Dyno so the charts are easily readable?

 

Ok guys, new update:

Car was back on dyno today for higher boost tune. At 20psi (reading taken from intake manifold), the car HARDLY/DOES NOT MAKE AN INCREASE IN POWER. The graph is similar to above and there was detonation around the peak area. The things that I talked with my tuner is that the power drops off steeply after 5600rpm.

Your suggestion for this factor? turbo exhaust housing too small, exhaust is too small (2.5"), Head flow issues, cam issues, incorrect vtec crossing or tuner??

Right now, car is tuned to 15psi making 285whp, which is great on street (but i would of had thought it can make more).

wow...I had no idea what the scaling business is. Also you're right, 0.48 housing is hell small. The other thing is..I have no idea what the compressor housing size is (how do i find out?? Treadstone didn't tell me anything). I'm a noob, who build his first turbo car in his garage and got this far :p as far as I know the turbo that supposed to come with the kit is a V-trim. Treadstone gave me E50 (is this the compressor wheel size?).

I don't know, it's just Australia LOL

 

BuMp for help. More update above.

Also want to know if changing just the turbine housing to 0.63 or 0.82 is worth it?

Ref: http://www.treadstoneperformance.com...rbine+Housings

 

every H/F i have seen with the turbonetics kit (or similar) has this exact problem. need to swap the exhaust manifold and turbo and it will wake up. dont bother changing just the housing.