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Most any other brands compressor will be different, even if it is the exact same size. Using your logic, we can't really compare ANY turbos.
using my logic means if you were to compare then at the least stick with same compressor and very close turbine size.
Originally Posted by SLOW SEDAN
lol a Precision 76 vs a ching chang 78 seems reasonable to me since the precision 76 still makes more power. I've had both and Game ova has had both much with the same results. He showed it on the dyno and mine showed it on the track.
i know 2mm seems like a small difference but that could mean A LOT as far as performance / efficiency goes.
I didnt find a 78mm so im using a 72 vs 70 for quick comparison. 2mm difference but a huge change in where your setup would land.
and this is just comparing compressor.
imagine what different exducer size, then turbine size then a/r size. numbers of wheels etc can do.
Fair argument but an assumption none the less. Personally I've had great luck with Turbonetics so I'm kind of biased. However I wouldn't really consider them to be a "name brand" manufacturer. The types of turbos that the LS guys buy really aren't all that much better than the competition. So I can see why guys are trying to compare china turbos to them.
IMO I still think Borg Warner is the answer to all questions if you can fit one.
any experience with holsets? how do they compare to borg?
using my logic means if you were to compare then at the least stick with same compressor and very close turbine size.
i know 2mm seems like a small difference but that could mean A LOT as far as performance / efficiency goes.
I didnt find a 78mm so im using a 72 vs 70 for quick comparison. 2mm difference but a huge change in where your setup would land.
and this is just comparing compressor.
imagine what different exducer size, then turbine size then a/r size. numbers of wheels etc can do.
Even though the on3 7876 has a compressor wheel that is 2mm larger....the compressor cover is inferior to the PT7675. Basically negating the bigger wheel.....and it is shown on both the dyno in my case....and at the track as slow sedan already stated.
I get what your saying. I assumed that china turbo does not have as much R&D behind them and lower precision we can see that in the price.
what im saying is that there is a possibility that with 76 it actually put your setup right in the center island vs when you switch to a bigger compressor but you stepped off a few island so its not as efficiently matched. = more heat.
im not saying thats exactly what happened but thats the kind of thing that pops into my head for a comparison like this.
you guys are probably right, the design could be that much better(and for the price difference i hope it is) im just adding in food for thought lol
Last edited by LS325ci; Nov 15, 2016 at 02:30 PM.
Reason: edit: does not.
Lol yeah ok. I'm not saying one brand is better than the other but this "Test" will prove none of what you just said besides price. I mean what do you all expect to happen with a massive jump in turbine size on an engine that size lol! This is just another bandwagon for all the China turbo guys to jump on. And FYI Turbonetics has excellent customer service. They replaced and upgraded two of my turbos after a year of use because the wrong turbine wheel was installed initially. No questions asked free of charge.
My next build will likely get a China turbo because my HP goal will be Sub 1000whp and I'm cheap. With that said I just don't like that this turbo swap is being structured in a "Test" format. Because it's apples to oranges and should be treated as such. Then again it seems like everyone besides the OP is unaware of that.
My post was sarcasm. I get the feeling what I posted is the point of these threads though. Borg Warner and Garrett are next lol.
Got the car mostly together. I just need a temporary port for my WG hooked up. The cover is bigger on the on3 and is very close to my balancer. I had a couple things come up and couldn't get right on it. I will have it on the road soon. And I can do the "seat of the pants test" lol. I am fully expecting to gain up top, but that is not everything. Going from a turbo that spools quick to a laggy peaky is not the result I am hoping for.
The 76 wasn't sweating at 7lbs and probably in a good place compressor map wise. At a like 7lbs I don't see the bigger turbo doing much more. That's my vote anyway... Been wrong before (alot).
IMO if he keeps it as 7lbs... I'd want the smaller/faster spooling turbo.
Pretty sure I fart harder that 7lbs these days though.
In for results.
OP - if you move the inlet of the turbo to a cold air source it will drop charge temps a ton. That's a really poor place to have your inlet. For every degree you drop off you drop off inlet temp it drops like 3-5* of charge temps.
Last edited by Forcefed86; Nov 17, 2016 at 02:02 PM.
The 76 wasn't sweating at 7lbs and probably in a good place compressor map wise. At a like 7lbs I don't see the bigger turbo doing much more. That's my vote anyway... Been wrong before (alot).
IMO if he keeps it as 7lbs... I'd want the smaller/faster spooling turbo.
Pretty sure I fart harder that 7lbs these days though.
In for results.
OP - if you move the inlet of the turbo to a cold air source it will drop charge temps a ton. That's a really poor place to have your inlet. For every degree you drop off you drop off inlet temp it drops like 3-5* of charge temps.
I had a diffrent inlet setup for it but, my new trans cooler with fan install took up too much room. So re-working it is on the to-do list. I also did not know that about the inlet temps. I obviously knew colder is better, but I did not know it translated like that.
I had my old turbo way over 7 psi too, just not on the dyno that day because of time restrictions. I'm still kind of new to force induction. So I'm all for any pointers.
if that is the 78/75 it is a good match for a 5.3 or 5.7 engine. spools fast and will pull good to 6600.
i built a hot side for my buddys Camaro it has a 5.3 with a isky triple 12 cam and a single on3 78/75 cast wheel turbo. at the track it leaves at 7 psi and goes to full boost in .80 of a second . logs showed 20.3 psi boost car ran 6.05 at 114 mph 1/8 mile and 9.44 at 140 mph 3550 lbs .
i think with a little more timing and a little more work on the launch it will go 9.20s at that boost. but in the spring we will try to max it out and see what it has left.
if that is the 78/75 it is a good match for a 5.3 or 5.7 engine. spools fast and will pull good to 6600.
i built a hot side for my buddys Camaro it has a 5.3 with a isky triple 12 cam and a single on3 78/75 cast wheel turbo. at the track it leaves at 7 psi and goes to full boost in .80 of a second . logs showed 20.3 psi boost car ran 6.05 at 114 mph 1/8 mile and 9.44 at 140 mph 3550 lbs .
i think with a little more timing and a little more work on the launch it will go 9.20s at that boost. but in the spring we will try to max it out and see what it has left.
Those are some good numbers, what pcm were you guys using? Also what boost controller? Were you happy with it? I have a 6.2 with a LS3 top end, so I'm hoping it's a good match
Those are some good numbers, what pcm were you guys using? Also what boost controller? Were you happy with it? I have a 6.2 with a LS3 top end, so I'm hoping it's a good match
I dunno man, might be asking a lot of a 7875 on a 6.2 with an ls3 top end. If you have room, you might want to skip over that turbo.
car runs on microsquirt and a cheap $80.00 turbosmart manual boost controller. with a 10 lb spring and the controller does the rest. engine is a 05 truck engine intake and all with stock48s triple 12 cam and springs. the 78/75 turbos might not be best for peak hp numbers but I think we can get it in the 5.90s with a $399.99 turbo.
Sooooooooo, I got the turbo on. Ran great power up top was great as expected. I started turning it up and saw smoke under my hood. I was expecting to see a leaking oil line. But it was coming from my catch can vent. Oil all over around it too. I was checking things out when it started smoking real bad. I am going to do a cylinder leak down this weekend but it doesn't look good.
Sooooooooo, I got the turbo on. Ran great power up top was great as expected. I started turning it up and saw smoke under my hood. I was expecting to see a leaking oil line. But it was coming from my catch can vent. Oil all over around it too. I was checking things out when it started smoking real bad. I am going to do a cylinder leak down this weekend but it doesn't look good.
China turbo already destroyed your engine.. tisk tisk. I kid I kid sucks to hear man.
Sooooooooo, I got the turbo on. Ran great power up top was great as expected. I started turning it up and saw smoke under my hood. I was expecting to see a leaking oil line. But it was coming from my catch can vent. Oil all over around it too. I was checking things out when it started smoking real bad. I am going to do a cylinder leak down this weekend but it doesn't look good.
when you say all around, do you mean all over the engine bay? like it came out of the dipstick?
if so sounds like a blowby, how many miles did you have?
the other question is did you plumb the crank vent properly?
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