Jump to content
SAU Community

Recommended Posts

hey guys, I'm the one that did the tune.

We've left it pretty rough for now as the dyno run was only a power run, not a tuning run. I agree, there is a bit more tuning that needs to be done (In my opinion the curve is bad, and needs to be more straight, but nothing I can't handle). Its only been on the road twice for a couple of hours each so I didn't expect the AFR line to be too straight, but straight enough.

We gave up early because I did the usual tuning "tests" to see if there is a restriction.

1. Boost from 18psi to 20psi - 272rwkw to 278rwkw - Shitty gain

2. Timing - Increased timing on full load by 2 degrees - Power up to 281rwkw. Shitty gain.

3. More timing - No more gains AT ALL. Eventually, detonation

This leads us to believe that there is something stopping that extra power being made. You could feel it restricting somehow. Everything else is great though, torque curve is nice and straight, and consistant, power curve is about what you would expect with a 0.82 rear housing.

I'm making 314rwkw with the 0.63 rear, and most the the same, other gear. Here are the only differences (as per my 314rwkw run)

- Intercooler piping is bigger from the turbo to the hot side of the intercooler

- 0.63 Rear housing

- 225ml\min water meth nozzle (Mitch is running a 375ml)

- Larger q45 AFM

- Standard Intake Manifold

My car had the horrid 2.5inch cat on it when I did that big run.

I will say this though - My car has always felt a little laggy off boost. Nothing bad, just different from most other R33's that I have ridden in. This makes me think I may have cams installed. I do not know though. I'm getting that dreaded Exhaust side tappet cover leak fixed soon, so I might check then and see if the cams are any different to stock.

I'm sure we'll find what is wrong. Just a matter of trial and error.

Here is my cars dyno print out (same dyno) with a new fuel pump and a quick 1 hour road tune done all by myself and no driver.. (annyoing! haha)

314rwkw-2.jpg

314rwkw-1.jpg

Edited by The Mafia
  • Replies 44
  • Created
  • Last Reply

Top Posters In This Topic

trial error and head aches lol

cant complain really..i guess there is alot of people on here wishing they could make anything close to 280kw but i just got to crack that 300 mark....

i run a different setup but i use a greddy copy and make 500kw with no problem it is a bit lagger then the standard one but i did picked up about 20kw. fix the exhaust its a problem i had a 3 inch exhaust with a 3 inch gudded cat and the cat housing was the problem i changed to a full 3 1/2 inch exhaust and what different it made to the boost response it was like a new car. the cooler pipes, i have been there and done it didnt pick up any more power but i did pick up 200lb of tourqe. thats just my results from what i have done. good luck :D

Cmon Mafia, i though you'd have a spare boost gauge lying around..... just make up an adaptor for the O2 port and measure the Backpressure. Good tool to have in the tuning arsenal.

Gary

No probs, just use a silicon hose or something abit higher temp ..... its only in there for a couple of pulls , or runs on the street. Just give it abit of length to keep the heat from the gauge.

Been doing this for years, easy to catch dying cats with. Just did my own skyline recently, suspected dying metal cat, sure enough 7psi ! .. gutted it to get 3.2psi !

Just hook it up to a second map channel on the dyno and you can graph it along with the power curve.

Gary

fastrotor

thats a great idea.....will definetly look intot that.

mafia i got an old boost gauge i think and i can pull the middle out of an old o2 sensor and weld a fitting onto it to run a bit of heat proof hose to the gauge

I will say this though - My car has always felt a little laggy off boost. Nothing bad, just different from most other R33's that I have ridden in. This makes me think I may have cams installed. I do not know though

Would be nice if cams were installed but I tend to doubt it as its near impossible to notice the loss of power down low until the cars noticeably caming over.

Chances are either cam timing is slightly off OR most likely its running a thicker headgasket or the motors running a lower static comp due to being previously rebuilt.

IMO :(

this is going to be interesting....

ok this is a stab in the dark...what if my cam timing was out by i tooth... could this be a possibility or would that show itself before the tune

  • 2 weeks later...

hey thought i might post up the results of the back pressure test with the boost gauge on the dump pipe...

i have 5-6 psi back pressure..it really suprised me how much! will post the result after i fix the restricting cat......

waiting with baited breath....... :/ Hope YOU get some results....

my personal car was 7psi ! , gutted the magic cat, and dropped to 3.2psi ..... gain ? NOTHING. Hence why im still scratching my head....... Just plumbed in a 100psi stainless sensor via silicon to the turbo manifold to measure TIP..... Would know by now but unfortunately in my rush to change oil filter, i broke off the oil filter mount thread !!!!!!! Arrrggg....

Gary

hi fastrotor so you had no gains....dam...did you dyno it to check results or could you notice no gains driving around...i guess untill you have 0 back pressure still going to be a problem

I have the same sort of thing happening with mine

boost increases do nothing

14psi seems to be the sweet spot anything above that doesnt give you much more power

although i did find a big boost leak in mine which ive since fixed but havent run it on the dyno since.

the car feels different to drive so im hoping it makes a big difference

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Latest Posts

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...