In other words, the pump was unable to do the job and the guy was lucky he didnt grenade the engine and thats on a good day. There should be NO fuel pressure drop and then a certain percentage of headroom built into the fuel supply system to allow for voltage supply drops and so-on. l8r E
Yes I saw that but with a 2.5" throttle body. if money permits I will do my own test on final tuning .full 2" vs full 2.5" .
The stock TB will not be a restriction you can measure with any surety. Your going to waste your time and money. This I can ASSURE you. A 4? mm TB is NOT going to be a restriction in front of those pissy little inlet runners M8. l8r E
Graph of the boost pressures, there are two runs shown and each has the MAP and the turbo outlet pressure.
Down BB , down lol I see your point , without a actual comparison this thread is missing a key element of "STFU" Still a interesting write up ...
Do you have the temp recordings with those pressures? The way I see the results, you want to measure flow but just the PSIs might be telling a different story. If you had just an insulated pipe with no intercoolers, you could also have a zero pressure drop... Then you might also say yay, no point in doing anything. I'm with BB. A back to back /full vs full is the test everyone's after. Anything else is just a hyphetical discussion. I say Glen, complete the test and shut up any doubt.
So what limit should the average stock pump be able to handle? - I have heard so many storys that were supposed to be an overkill. How does the drop cause it to grenade ? Is this from a sudden vacuum at high RPM? Still learning a lot here from your posts!
Meh to carry on and run the other pipes would cost me another day off work and another half a tank of gas and another ~ $300 worth of dyno time = close to a thousand dollars just for something we already know. The 2.5" pipes are claimed to lower resistance to flow, there is F all resistance there already we found that as soon as we started testing PROPERLY. The car the kit was purchased for needs to go on the dyno for a tune in a couple of weeks, I can slam a couple lengths of two inch pipe in the inlet tract for shits and giggles then. That's all it will be by the way shits n giggles, if we had say 25PSI at the turbo and 22PSI MAP then yeah MAYBE worth doing something and you MIGHT get ~ 20KW from it. Put it this way: If I measured the back pressure in your exh just after the turbine and found 1PSI back pressure and told you your car will go waaaaay better if we reduce that to 0.8PSI by replacing the entire exh with a bigger one ........
That's all good Glen and I agree. A test will cost a few squid and take time. There may be nothing to be found. But the topic was a 2' to 2.5' tract flow test. You have not yet done that. The only thing you have done is a Z1 cooler pressure drop.
Yip that's correct, it's a bit like when you go to pump up your tyres and find they are already at the correct pressure - nothing to do here, might as well go buy a pie :rofl:
As I see it .... This was a true test of the 2? boost piping fitted to the z32 Twin Turbo ? what it wasn't, was a ?comparison? between the 2? piping and the aftermarket 2.5? piping. The Dyno used was hub Dyno which all but ensures a direct comparison between runs by removing variables like wheel spin, changing tyre pressures, strap tension etc. There is no doubt the 2.5? piping can flow more than the 2? stuff ? but NOT at the levels of tune ? 99% ? of z32 owners have. The ?claim? is that the 2.5? piping will improve the performance of all cars, even those still fitted with with OEM Turbos ? Glenn's test of the 2? piping was on the piping only, larger intercoolers and TB's are fitted to remove any possible restriction caused by the OEM items ? the results clearly show there is zero pressure drop (flow) in the mid range and negligible pressure drop (flow) even at 7000rpm and 22psi with much larger Turbo's than stock, so why would you spend your hard earned on something that is not going to be an improvement. What this test didn't confirm, is whether the stock intercoolers and/or TB's are a restriction or not, my guess is changing to larger intercoolers removes the restriction from the system, NOT the larger piping as has been claimed. Now, if you were going to run some 2871's and bigger and in excess of 20 -25 psi I can see the larger piping could/would be of benefit, but most mere mortals aren't going there. These thoughts are backed up by the Tuner ( one of the top ?Link? tuners around ) who ran the car on the Dyno I know where I'm spending my money ... a new and bigger Fuel Pump
NO!!!!!!!! Not in this instance. The psi change (or lack of it..... and Im willing to bet the vast majority, if not all of that pressure drop is across the coolers alone) tells everything you need to know. Its black and white and the case is closed for those who have even a passing understanding of basic fluid dynamics. End of story. E
Well it would be end of story but seeing as some people don't get it I'm going to do them a favour: Dyno time booked this afternoon to carry on in Ernest and test the 2.5" system anyway, I know I am wasting my money and time and even if the results prove the pipes are of no use (at these levels) people will just find excuses. I FULLY expect every excuse you can possible imagine from a few members of the community (internationally) but at the end of the day this test can not and will not lie. EBC disconnected stock pipes Vs 2.5 pipes, same throttles, same intercooler cores, same length pipes, same car, same dyno only minutes apart in the runs. [TIS][TIS][TIS][TIS][TIS][TIS][TIS]
still not valid . until you use the 2" throttlebody in the first test .as a full 2" inch system . you refuse to do a proper full 2" vs 2.5" for some reason . I'll leave it at that ..
