RESISTANCE IS FUTILE-BATTLING BORGS

so who makes more power Viet or Borg in this video we're going to compare this Gen to 70 to 75 to go from V is racing to an S for 75 from more warm now is this an absolute test not even close whichever one does better doesn't mean that abs racing turbo has better than all bore workers or that all more were turtles are better than all B is racing turtles in fact this test doesn't even have the same specs on the turbo these happen to be two turtles that I have laying around so it's less about an ultimate test then it is about testing two turbos that I happen to have what I want to see is are there differences can we attribute those differences to the differences in design okay it might not be the ultimate turbo test but is it turbo tips we've got a turbo motor up on the night and it's already running we're already making boost and we've got to eat rumors I mean you got a run both right let's find out what happened our test motor was a 4.8 liter LR for you know I changed who made to it was a set of je forged pistons also had Snake Eater 1500 jackers and all tuned by a Holley HP management system turtle kibbutzim nothing fancy stock exhaust manifold which you get when you go to the Rick inherit if you get a motor we made it white pipe Jason over J fab whip that thing up and ours we actually ran to waste gates although it's probably overkill we just wanted it on the dyno we have better control that way there seems to be more need for that on the engine dyno then there is out of the street and the chassis dyno but you can get away with one for our turbo test we make sure to have plenty of exhaust ball it's one of the critical elements in turbo performance not so much the exhaust feeding interval but the exhaust exiting the turbulence well that as big as possible and we didn't want to restrict either one of these children's for both the turbos we ran this pro target every water down for bed by Dino water on both instances both of the turbos exited through this three and a half inch discharge tube fancy up top factory truck intake I mean you know why do anything else it came with the motor for our turbo testing we relied on a set of 1500 Snake Eater injectors we've got more than a few even running e85 we got or digit stuff these are working well for our turbo comparison we're relying on a TC 1 turbo controller to control the booth make sure that it was set and nice and even all the way across we have enough spring in the wastegate to go way beyond the test abuse level so the controller has perfect control over [Music] we've got the S 475 on say they're cool what everybody saw snuck right up it's pretty easy slop let's find out how much power it makes [Applause] despite the fact that this test was about comparing two different turbos I wanted to include the NA power output of our test motor it was a 4.8 liter with the forged pistons and head studs and gaskets on it but stock head stock intake manifold had those big snake eater injectors and an every water intercourse when we ran out with the turbo but when we ran at na with our summit 8720 camshaft it produced 416 horsepower and 400 or 370 foot-pounds of torque so here's what happened you know so it was a good start basically this was a canned 4.8 liter so now let's take a look at the s4 74 the vs racing turbo we ran this we were commanding on our TC 1 electronic wastegate controller we were commanding 18 pounds of boost and we got a fairly flat boost curve and I'll show you the curves in just a minute so equipped in this manner our vs racing turbo on the 4.8 liter produced 810 horsepower in a nice good curve and 766 foot-pounds of torque so you can see pretty stout I mean cam 4.8 liter with boost pretty good stuff so now let's take a look and see we'll do the comparison with the s4 75 BorgWarner turbo so here's the same thing with the Borg Warner turbo now there are a couple of things that are real important about these curves first of all if you look down low below say 3,600 rpm the s4 75 in red was a lot more responsive down low it came up on moose immediately you know it was basically at just about full boost on the load Ian on this and the engine dyno doesn't show boost response very well but it definitely shows it here because with the vs racing turbo we weren't able to get full boost until we released the dyno and it started to get happy so the s4 75 would definitely be more responsive than the vs racing turbo but on the flipside out at the top the yes racing turbo made more power at the same bus level and it's interesting to note that on our TC one controller when we installed the s4 75 turbo that we had to command another half pound of boost on the TC 1 controller to get the boost curves to actually be the same so it was interesting that that happened and I think we have a reason for that when we take a look at the boost pressure and back pressure curves so the vs racing turbo more power at the same boost and the air fuel and timing were kept constant more power at the same boost a little bit less responsive and I think that that's a direct function of the hot sides of these turbos the s4 75 was obviously a tighter it had a 1.0 AR and the vs racing 1.25 so I think that that had a major effect so now let's take a look at our booth curves if we take a look at the booth curves supplied by each one starting with the booster from vs racing now we had commanded 18 pounds on our TC 1 boost controller yeah we got it you know on the 4,500 to 5,000 rpm range he was a little bit shy and a couple of other places and seemed to fall off kind of at the top there which is interesting now if we compare that to the s 475 and this big dip you're here seeing in the blue that's just a reading of faulty reading on the dial we have the data logging from the Holley because we use a Holley HP management system the data logging is perfectly smooth and we're also obviously watching that on a mechanical gauge student so it was perfectly smooth there was no dip there and there's nothing indicated in the power curve either but you can see that we got the boost curve real consistent but as look down below 3500 rpm and you'll see why there was such a big difference on the power curve the boost comes on we had almost well basically full boost on the s4 75 even on the load in 3100 rpm whereas we had about 10 1/2 or 11 pounds on the PS racing turbo so I may have made a mistake there on the s4 75 we had full boost on the vs racing we only had 10 or 11 pounds on the load in and maybe that will help you maybe the hell I help you launch if you don't want the boost but the s 475 definitely more responsive otherwise the boost curves were pretty consistent after that and but the power curves obviously showed that the the V s racing turbo made more power than they asked for seventy five out of the top and I think that the answer lies in the back pressure curves we're gonna take a look at that now now we can take a look at the back pressure this is a boost pressure curves and this is on the V s racing turbo you can see that the back pressure started out quite a bit lower than moose pressure when we had ten and a half pounds of boost pressure but only 7.1 pounds of back pressure and the crossover point where it started making more back pressure than moose pressure was 5200 rpm and out here at the top when we got the drop in back pressure our boost pressure sixteen and a half pounds and then 20 pounds of back pressure so about three or nineteen point nine so a little less than three and a half pounds of difference between the two so that's actually a fairly good curve and that's kind of what we expect with from a good-sized turbo a good-sized single turbo on one of these applications so now let's overlay the s4 75 hopefully won't get too confusing here so on the s4 75 we had seventeen point eight pounds of boost pressure twelve point nine pounds of back pressure but this thing crossed over a lot earlier at 4600 rpm so about five or six hundred rpm earlier than the s4 or the PS racing turbo and out at the top the difference is much greater we had seventeen point three pounds and twenty four point six I actually think that the drops shown on the vs racing is also another error on the recording of the dyno so it didn't show that on our logs or anything so it was much more consistent but anyway the difference is quite a bit bigger so you're talking about seven pounds more back pressure than moose pressure which is partly why that this s 475 was more responsive but also why it probably makes less power out at the top compared to that vs racing turbo let's get to our conclusion okay what did you think about the to the berm and the vs researcher now I do I'm going to get it a following comment because I always hey when you run a triple test you have to make sure that everything is the same on the turbos the wheels have to be the same in the AR has to be the same in the hot side the cold side bla bla bla bla here's the reality they don't need to be the same if the specs are all the same between the two turbos they're gonna make the same out it's not a very fun test I like testing things where there's going to be different and the big difference between these two terminals had nothing to do with one big of World War one thing from vs race had everything to do with the hot side both of them are g-force but there was a dramatic difference in the AR the vs race eternal 1.25 the board 1.0 so a tiger air meets this turbo would be more responsive more responds better for rate or power down low all that's good great but the problem is you know it comes with that response rate back pressure that's a key factor during de jure response rate unfortunately increased back pressure also hurts power at the topic so the vs racing actually made more power at the same who's level on the big end because it had less decoration so till all that camp ships small camp what's power Delma big camp lots power up top but there's always a trade-off that's not gerbils I'll return older guys thanks for watching make sure like share subscribe kick tell a friend I'll keep texting

Channel: Richard Holdener

Views: 84,157

Keywords: turbo, boost, vs racing, s475, intercooler, back pressure, charge temps

Id: AOEOFz_TjZA

Length: 13min 5sec (785 seconds)

Published: Thu May 14 2020