japsky33

Any number of reasons which i pointed out in the other posts, ie exhaust design and manifold/ tune/motor/ turbo blah blah blah.. This bullshit about oh im using that wastegate on a 9million kw motor so there must be something else wrong crap is just that utter shit. Ive said my argument on that to many times Ill post you the dyno read outs for this car monday, Ive never ran into a incorrectly sized wastegate by it being to large I have seen issues with large wastegates and fluctuation caused my manifold design. :rave: As I said they will both creap open wether that be at the same time or not?!?!?! I was talking about this inital creap your wastegate is semi opened before it hits your desired boost they dont just snap open and shut. Br, JH

Could be either boost leak, or I have seen this issue where cat was full of fuel.. Funny i know some customers do have em. BR, JH

Hey Tang0, Unless your competant to adjust the tune theres really no point in installing it before the FMIC. It standard will make less power and probably damage your motor if your flogging it around. NO point in tuning it twice just wait till the FMIC goes on. BR, JH

Hi SydneyKid sorry for the delay been to busy. 1) straight connection to wastegate ie no boost controller involved the wastegate dosent just snap open at exactly 7psi it actually creaps open could be causing the smaller wastegate to be fully opening/closing all the time where as a larger diam wastegate would only for instance need to be opened halfway. Back to your theory on causing damage to the diaphram from opening/closing to much if you look at it that way actually reverses what you was saying. As for your 35mm wastegate theory there I have to say that we have a 38ml on this car I told you about and it wont hold boost fullstop. There is just to much exhaust velocity to stop the turbo from spooling with that small a wastegate on this application, your theory did not work on that car. BR, JH Note that this is accomplished by pneumatic pressure, it is not instantaneous (like electrical switching). So you get surges of air pressure travelling through small pipes that consequently take time to open and close the wastegate. Hence you get surges in boost. 5. 260 X 1.34 + 90 = 410 bhp 410 / 11 = 37 37 / 20 *19 = 35 mm wastegate Hope that helps :Party:

You just said again your NOT GETTING BOOST? I didnt say your boost guage wasnt working Im asking you are you getting POSITIVE pressure showing on your gauge ? I'm trying to help you your problem sounds alot like a leak in your inlet tract. I have seen temp sensors cause issues with the computer but you said your self you have checked it. Did you check it from the sensor side or inside the car ?

A smaller wastegate can also create to much back pressure in the manifold can also create boost creep at higher rpm. With the wastegate fluctuating the boost you thought by .3 bar on a lower powered engine I dont see the wastegate as the problem id point towards the manifold design or the boost controller, or did changing the gate fix this issue ? The wastegate going up and down alot more then a smaller one ? In theory wouldnt the larger wastegate help ramp on to boost quicker with less backpressure ? as you have said in your theory is that a wrongly matched turbo will cancel out your wastegate issues anyway exactly pointing at (2) A larger wastegate will not effect holding your boost levels if your turbo is matched correctly and your boost controller is doing its job. Considering your argument work this out for me and tell me what wastegate would be suitable RB25 standard, T3/T4 400HP @ 20psi .63 back looking at 20psi to create around 260rwkw. tell me what size wastegate ? I can give you more info if needed BR, JH

OK, well ignore my comment then from your last posts I thought you werent getting boost JH

Oh its 450HP.... It runs 2 of them Im going to leave 1 off and dyno it watch it crack over 500HP :headspin: (Boat motor) BR, JH

Generally if your FPR fails you will be over fueled to the point you will have black smoke pouring out the back. So the whole rebuild thing is ass. Your injector duty cycles have nothing to do with that at all bascially 10.5 - 12ms (depends on ECU) is max injector duty before there fully opened so the ratio is worked out depending on where your tune is at that point! IE: (EXAMPLE) 18psi - 6500rpm - 80% load = 6.5ms so therefore your around 60% IDC offuisly the ms on the injectors are decided on your AFR where the tuner feels is best. I think your mechanic is probably saying you can get close to your 250rwkw with standard injectors a fuel pressure reg to up the rail pressure and some more boost. You can make 10million HP theres no extra load on your FPR. BR, JH

Gigolo, If your car is running ok now then your FPR is fine.Any good mechanic will do a run with a fuel pressure gauge whilst on the dyno checking your readings regardless. As for the 740cc thats a huge over kill for 250rwkw but that’s fine it’s good if you plan to go further in the future anyway. As for idling problems there’s no way if your tuner has a clue you should experience any issues with these size injectors and at a sensible base fuel pressure. BR, JH

Mickroy, YOur telling us that you can hear the turbo spooling but your boost gauge is reading 0 ? and your experiencing fluctuated idles ? Check your inlet tract buddy I think you might have blown a pipe off. BR, JH

Hi guys, Your stalling issues are due to you venting the air that the AFM has told the motor to compensate for. You can get BOV's that vent a little back before the turbo and some out to atmosphere so you still get the noise. That will help you with stalling after a big hit. Some of those are very high pitched like old mate said and they sound terrible.$400 for a BOV I dont know how you can justify that though. BR, JH

Honest to god if you believe that Im going to prove it wrong to you in person, just give me 3 weeks till this 6ltr stroker is finished and ill show you it peel over 450HP with a 450HP turbo on it. You can watch it get dynoed. :headspin: :headspin:

I didnt guess I use my own formula based on the facts not air fairy airflow becuase of how much boost I want to run, Hell the customer might want to run 10 one day then 30 the next I dont know do you ? OK you believe my but now we have to play a stupid game of i know one well i know 10!!!... come on SydneyKid ? Give me answers to your formula that I'm asking not stupid things like that. I'm only putting my two bits in to see if you can prove to me this formula for wastegate sizes. BR, JH

This topic has gotten way off what me and SydneyKid started with so I'm just going to leave it now.. It had nothing to do with skylines being a drag car or racing teams etc etc. BR, JH

That wasnt what I said I said the 600Bhp motor would still make more then 450HP thats what I said. I know the restriction in its exhaust (the little turbo) will cause it to lose power. Read more carefully. BR, JH

Not unless you expend the exit hole, Its not a complaint about there product its working fine. Your missing the point. BR, JH

HI SydneyKid I didn understand this last bit ? I can see you and I are going to have some interesting posts :cheers ??

Dnb your sort of correct that was an issue with the car the bend off the gate was to tight, I told him this he removed it but its still creeping (just not as bad) I thought I would let this post go for a bit and once again Sydneykid with his formula's . There is no exhaust back pressure issue here. ITS SIMPLE. THe manifold is designed correctly taking exhaust pressure for the wastegate from every cylinder the dump pipe is over 3inchs so what then ? well theres to much exhaust velocity and to small a wastegate to control the turbo from creating more boost then his set level in this situation Case closed, Either modify or upgrade turbo, OR add an extra wastegate. czy18e I think you worded that wrong and infact what you was saying the mechanic said is exactly what SydneyKid said. 300rwkw needing 22psi with a 3040 ? Well today I got 355rwkw with 20psi on a standard 25 with a 3040!!. I dont understand how you are using HP readings to indicate wastegate sizes its beyond me ? Do drift cars often use twin 38ml ex gates becuase there making 800rwkw ? NO its to control boost on a very efficent manifold and small turbo for quick responsive HP. That formula should be worked out on exhaust velocity and the turbos A/R both front and back. BR, JH

MR30 I wouldnt change anything with out a sniffer up the back at best. You could have different injectors/fuel trim settings /timing offsets and trims... List goes on. Find a good tuner and head there! If your in Sydney PM me. BR, JH

====================== QUOTE : SYDNEYKID But remember this post.... Quote: Originally Posted by japsky33 What you can do is get each others REAL drag MPH from the track and match those up =========================== WHAT DOES THE 'REAL' MEAN IN THAT DUDE ? Thats the part where you both get accurate MPH of your car's and compare it. BR, JH

What about this turbo pushing 7psi on some crazy 6ltr stroker ? stupid I know but the car will make more then 450HP !! Its silly to assume the turbo on any given boost is going to produce ex amount of power on your car. The turbo being rated at 450HP means it can flow 450HP but before this turbo goes on your car you might already be making more then 450HP... As for 270rwkw at 20psi with that turbo you might not even get that ! Get your max fuel/ignition to boost levels you/your tuner want. See what power you make then that’s a clearer indication of what turbo you should go to. IE: 14psi might be more efficient then 20psi on your car's setup. No one can answer that but the tuner on the day. BR, JH

Agreed 2rismo..! And I think by reading this people are getting confused with QUARTER TIMES AND MPH And the fact that people are bringing things like this into a discussion about power/mph "dynos for getting rid of problems and running in motors" well that’s stupid because who is going to go to the drag strip to get rid of problems and run there motor in??? Dahhhh :confused: Your quarter times can vary a lot. Take my example with the 180sx for instance. But your MPH assuming you get a reasonable pass will stay with in an acceptable limit. I’ve seen this over and over again with my Car's and close friend’s cars where I have done a run after they have. I’m not using theory and I don’t use other peoples examples or what I have watched to make my opinion on this matter IM using what I have seen over the years with my cars (SEVERAL OF THEM) and I consider myself a standard driver I mean how hard is it to take your car down the strip getting through all the gears where not talking about sub 10sec monsters. I’ve got a 355rwkw GTS-t R33 and I have no issues getting it down the strip time and time again. ============================== With you guys breaking everything isn’t it better on the strip in a controlled environment where you can get a tow home easily instead of in the middle of a busy freeway (Sydney) or on a trip. We want to make this HP to use it not to wank over dyno graphs. And dont say "I dont like driving on the strip" ? Get off its bloody awesome. ============================== I use dynos for all the normal uses as I tune and engine build, and I find it an excellent tool just not for the true performance 'of the most important word here' "CAR". Also considering the differences between this 300KW @ 970NM and 325KW @ 938NM ? Which tune will be faster on the strip and produce a higher MPH? These are true dyno read outs. With the engine dyno once again great tool for the engines HP but with this HP could you accurately assume what sort of performance you will get with this motor in the car? Of course NOT. AS for the person who can’t stand their car on the dyno what mate? As long as she's tuned it will love it, I think your babying your car too much. ---Qoute SydneyKid 7,000 rpm for 6 seconds = 700 revolutions of the crankshaft Time for a rebuild, new pistons, rings, rods, reseat the valves etc 7,000 rpm for 6 seconds = 700 revolutions of the crankshaft Time for another rebuild, new pistons, rings , rods, reseat the valves etc --- So your telling me that pac/gtr700 etc etc only get a pass or a few quarter pass' before engine rebuild? Hmmmmm... :confused: BR, JH

Check your speed cut dude. If your losing your throttle for a few seconds. BR, JH