New injectors now and turbo in the near future
- Thread starter Adamv7010
- Start date
TooMuch03
New member
I think it depends on what turbo you are set on using. Personally, I do not think 175/stock is a good combo. If you want to stay with the MTW stage 2, I would recommend 175/30s, no bigger. That turbo just doesn't move enough air to clean up any more fuel. If you at going with a larger turbo, you can go with a larger nozzle. By using a 30% nozzle, you probably won't reach the full power potential of the 175s but it will be clean, especially if you are running a small turbo like the stage 2. If you have the turbo for it, I think 190/75 is a very well matched injector/nozzle combination for an all around truck.
Would a pmax or s366 be a better option?
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strokin6L
Active member
MTW's billet hybrid vgt cleans up my 190/75's pretty good.
strokin6L
Active member
the stage 2 is a bit better than the powermax. Also, I really wouldn't want to run a 66mm turbo with 175cc injectors.
TooMuch03
New member
I agree. i wouldn't go any bigger than a 64mm with 175s. even with 190s, I would prefer a 64, but I really hat turbo lag. IMHO, the MTW Stage 3 or a 64/68/.83 with divided pipes would be great with 190/75s, probably with 175/75s as well.
strokin6L
Active member
Yup, my 190/75's worked great with that 64mm non vgt and it cleaned them up nicely. Adrian ran his stage 3 with a set of 175/75's and he said it was an animal.
TooMuch03
New member
If you are questioning why the stage 2 is better than the powermax, it has larger compressor inducer diameter, and based on the compressor maps, should flow a little more than the powermax. If you are questioning by a S366 isn't recommended with 175s, these trucks aren't exactly known for being able to spool big turbos and a 66mm with 175s will likely be pretty laggy and not well suited fr street and towing use. An S364 would spool better, and still be enough to clean up 175s
strokin6L
Active member
exactly what Adam said. MTW's stage 2 will flow more and be more suited than the powermax. The 64mm or even a 62 would work better than the 66mm with 175's. I would use nothin less than a 190/100 with a 66mm
Why? Its not really the compressor that determines spool up. Its all in the turbine wheel and exhaust housing. A 62/68 64/68 and 66/68 arent going to spool much different if they are all using the same turbine wheel and exhaust housing. Any charger is going to spool faster with more fuel, especially a non vgt, as obviously they dont have the aid of electronics to get them going.
190/50's with a 64mm would make a very fun street setup. Matt @ CED was running 190/stocks and a 66/73/91 and divided pipes and it spooled just fine, maybe a little slower than if it had a larger nozzle on it.
TooMuch03
New member
It's true that compressor size doesn't affect spool up much, besides obviously larger compressors being heavier. So, a 66/68 would spool a lot like a 62/68 or a 64/68, but it would be more prone to compressor surge and operate at a higher drive to boost ratio. IMO, the 68mm turbine is not a good match for the 66mm compressor, unless you move to larger A/R, but then why not just step up to the 73mm turbine, especially with as well as it performs with the 66mm compressor. Really, with 175s or 190s with a smaller nozzle, the extra air of the 66mm is unnecessary as the 64mm should be able to clean it up with out a problem, again JMO. I think it would take 190/75s at a minimum to be able to use the extra air supplied by the 66 over what the 64 can do, and why go bigger with the turbo than you need. I have to say, 190/50 with a 64 would be amazing on the street! Matt's truck with 190/stock (worn out stock nozzles) did run good. Personally, I like a little quicker response, but still pretty good, and I agree, a set of nozzles would help it take off a little quicker. How about some 190/75s and a custom 66/73/.83...
strokin6L
Active member
yes i already know that the turbine side determines spool up....nothin new. But the turbine side isn't the only thing that determines it.
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