This doesn’t nullify my statement. I’m glad none of the ones you have sold, but you don’t work for VTT and don’t know how many failures they have or have not had.Out of the hundreds of kits sold by VTT, a hand full possibly came back as bad but most likely could have been installed incorrectly by an unqualified enthusiast.
Just because some can swing a spanner doesn't qualify them that they know what they are doing.
Try carrying out repairs on your BMW and see if BMW parts will cover your warranty if not installed by a qualified mechanic.
But also some mechanics shouldn't be ones either.
No and this has already been defined. Just waiting results.Has anyone put a scope on the hpfp solenoid, does it go 100% duty cycle or does the dme cap it below that?
How sure is everyone this is 4x drive ?
You guys are great. The internets are great. I have a spreadsheet right here with RPM numbers on the shotgun Tony sent me, compared to this overdrive. I can tell which one is faster. You want to know how we get to these numbers? Its a pesky thing called math. You take one pulley and measure it against another pulley, and you get rotational RPM. The amount of misinformation in this thread is on par with the worst I have seen, from people telling us how many shotgun failures there has been, to guessing the overdrive % of this unit, and the shotgun. Keep guessing guys, it sure is fun to watch.LOL did VTT really try and claim 4x overdrive is not as fast as the shotgun?
Shotgun looks to be a 2x overdrive, if that. Anyone with a shotgun and N54 on hand can take 5 minutes to measure then divide crank pulley diameter by shotgun pulley diameter to get the overdrive ratio. It's simple math.
View attachment 27670
This is gold, spoken like someone waiting to show the world his lack of knowledge on all things manufacturing. So let's just use a tiny bit of common sense. You machine two separate parts, then take those two parts, and pay someone to weld them together, or you machine a single part. Hmm, I wonder which one is the most cost-effective? We went single piece housing for multiple reasons, housing failures were not the main reason. Another little fun fact. The biggest reason we lost a few of the early welded housing was due to using the stock belt with increased tension on it. Went to a larger belt, and the cracked housing issue went away. So we changed housing design due to cracking, wrong. The single piece housing is more expensive to manufacture, wrong. Exactly what I said about the internets. Everyone is an expert, please keep it up. I am enjoying this.IIRC they now offer a billet mount SPECIFICALLY because there were too many problems with the welded version. You know the billet mount costs significantly more, they did not go to this to save costs but to increase reliability which they had to because of the failures. They fixed the problem which is great!
Im just saying 4x sounds little crazy. Like stated already if it is 4x their is no way supply will keep up and just that would mean they are extremely over engineered which if was case I would think their would never have been so many stock failures.I think that was me lol. I've heard 3x from someone unaffiliated, and 4x from a tester.
You want to know how we get to these numbers? Its a pesky thing called math. You take one pulley and measure it against another pulley, and you get rotational RPM.
This is gold, spoken like someone waiting to show the world his lack of knowledge on all things manufacturing. So let's just use a tiny bit of common sense. You machine two separate parts, then take those two parts, and pay someone to weld them together, or you machine a single part. Hmm, I wonder which one is the most cost-effective? We went single piece housing for multiple reasons, housing failures were not the main reason. Another little fun fact. The biggest reason we lost a few of the early welded housing was due to using the stock belt with increased tension on it. Went to a larger belt, and the cracked housing issue went away. So we changed housing design due to cracking, wrong. The single piece housing is more expensive to manufacture, wrong. Exactly what I said about the internets. Everyone is an expert, please keep it up. I am enjoying this.
Chris
See above notesSo I took a closer look at the oem gear drive.
The oem configuration is a 61.1%(this is incorrect)underdrive for the vacuum pump and hpfp off the crank. I measured the gears with image analysis software passing the ruler through center of each gear perfectly horizontal for a true diameter comparison accounting for camera angle etc. (you really should try measuring the real thing)
So if we do the math, single shotgun kit returns pump to oem crankshaft speed then overdrives it 168.8%. This result is from the pulley measurements I obtained, 130mm(this is incorrect) crank pulley divided by 77mm (This is incorrect)shotgun pulley. (again you really should try measuring these things in person)
Divide 1.688 / 0.611 for 2.760 which means single shotgun effective overdrive ratio is 2.76 : 1 (none of your numbers are valid if you have incorrect data points such as sprocket diameters)
Helix at 4.x : 1 is still faster. the 61.1% underdrive part doesn't apply to Helix calculations as it's driven off the oem sprocket not the crank. (this literally makes no sense, the factory HPFP is 100% driven off the crank, so whatever reduction the factory HPFP is seeing the overdrive is multiplying that, not engine RPM)
No sir, math is only as good as the data you are entering. See aboveI think you missed my post where I did just that LOL
See above notes
Chris
You guys are great. The internets are great. I have a spreadsheet right here with RPM numbers on the shotgun Tony sent me, compared to this overdrive. I can tell which one is faster. You want to know how we get to these numbers? Its a pesky thing called math. You take one pulley and measure it against another pulley, and you get rotational RPM. The amount of misinformation in this thread is on par with the worst I have seen, from people telling us how many shotgun failures there has been, to guessing the overdrive % of this unit, and the shotgun. Keep guessing guys, it sure is fun to watch.
Chris
Well your math is wrong, no we are not going to provide you or our competitor with our RPM numbers. If you want them I suggest you collect the parts, get a good caliper, and do some correct math. The only misinformation being spread is by people internetting and calling that fact.Supply the correct numbers then. Or I'll wait and go measure a parts motor later and post real pictures.
Only cus you came in here spreading misinformation in the first place and I hate that you made me do math to prove you wrong. LMAO
I suggest you do a little bit of research. I know it's hard for people to wrap their heads around that we did this 5 years ago, but that's the case. If you look up our original testing, we have charts, graphs, logs, dynos, you name it, we did it, and we shared it. We just did it so far ahead of everyone else it was really not understood until now someone else is trying to do it. I know you may not understand the competitive advantage, but we have nothing to prove here. The shotgun works, and works well, as proven not by our cars, but by hundreds of customer cars running it. If anything Spool needs to be sharing their data to prove their upgrade works. We did that 5 years ago, again just do a little research. We are not going to hold a competitors hand and help them. This is business 101.Or maybe you can provide some actual specifications for your product lmao... If you have actual factual information to share then there is 0 reason not to. There is nothing proprietary about sharing flow numbers. The design of the VTT pulley is what would be patented not the resulting flow. I don't know of anyone who would buy a fuel pump without knowing how much fuel it flows. Otherwise, how the hell would you size the pump for your application? We are supposed to base builds on how fast some VTT car went in the 1/4 mile as if that is relevant in any way shape or form??? Sure sharing results is great for your companies image but it does absolutely nothing for providing your products specifications.