Van Turbo/ Injector Question
Cargo Master
Joined: May 2018
Posts: 2,442
Likes: 993
When KC was still in their beta testing of the S300 turbine I was one of the first testers. I built a gtp38 van with the 1.15ar, 70mm S300 turbine, billet wheel and ATS ported housing. It wasnt a bad turbo but it sure wasnt something to strive for, it did what it needed to do and nothing more. Boost below 2000rpm was quite low and overall boost was below 30psi. EGTs were pretty manageable but had to run higher RPMs to get any decent spool out of it.
Going up a big hill unloaded at around 2000rpm, boost is middle gauge.
Going up a big hill unloaded at around 2000rpm, boost is middle gauge.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
why drive over 2,800 rpm
decide if you want a overall good useable powerband, or mostly top end. If you want too end you will want larger nozzles too. Hard to have the best of both worlds with a standard non vgt single turbo setup.
a .84 is all that is needed on a truck with a %30 nozzle or less on injectors. especially if it sees tow duty
decide if you want a overall good useable powerband, or mostly top end. If you want too end you will want larger nozzles too. Hard to have the best of both worlds with a standard non vgt single turbo setup.
a .84 is all that is needed on a truck with a %30 nozzle or less on injectors. especially if it sees tow duty
CNCFAB
Joined: Apr 2020
Posts: 4,874
Likes: 2,006
do you have 4.88?
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
Originally Posted by ESwift
Put your mst back on, then change it to the kc turbine. My point will be made in real time for ya
Originally Posted by ESwift
The Borg 68 and 73 both in essence use the same turbine housing, the 73 is just milled put to accommodate the larger wheel, the 68 and 73 share the same blade design except size. The 68 spools faster because it is smaller and lighter.
I believe (on the SXE example) the larger diameter housing will have less velocity at the same exhaust volume. More velocity = more spinny of the whistler. Only meaning I think there’s more at play here than just weight.
Given the same diameter housing (stock), the turbine blade design should dictate how it spins at a constant rpm/load. I feel like the KC version uses more of the flow which should make it perform better under constant load conditions. During sudden acceleration I would expect a difference in lag etc due to weight.
Again, you have real world experience. I’m just theorizing.
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
Smaller trim wheel outspools higher trim.
Larger trim outflows smaller trim.
Van 70mm turbine and BW 73mm turbine has higher trim than smaller exducer ones. So smaller turbines spool faster If nothing else changes.
Thread Starter
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Tuned
Joined: Dec 2018
Posts: 337
Likes: 5
From: Chickaloon, Alaska
When KC was still in their beta testing of the S300 turbine I was one of the first testers. I built a gtp38 van with the 1.15ar, 70mm S300 turbine, billet wheel and ATS ported housing. It wasnt a bad turbo but it sure wasnt something to strive for, it did what it needed to do and nothing more. Boost below 2000rpm was quite low and overall boost was below 30psi. EGTs were pretty manageable but had to run higher RPMs to get any decent spool out of it.
Going up a big hill unloaded at around 2000rpm, boost is middle gauge.
https://www.youtube.com/watch?v=XNyYUm2Kx3Y
Going up a big hill unloaded at around 2000rpm, boost is middle gauge.
https://www.youtube.com/watch?v=XNyYUm2Kx3Y
Sounds like I am better off with getting the stage 1 injectors and seeing how the turbo does. I have an old truck turbo I could rebuild and put on the truck with the 0.84 housing. I could always throw a KC balanced assembly in that if it works better. I do miss the low end turbo power I got with the truck turbo and wondered if it would be worse with the stage 1s.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Yes. I have no problems empty. It's just when towing the trailer. Too much weight to maintain speed on the big hills without shifting down. And my biggest gripe is the HUGE gap between 4th gear and OD. I'll approach a hill and it pulls great until about 3 or 4% grade, then I have to shift down and the rpm goes way up. From then on it's a grind at 45-50 mph until I top the hill. I would love a Gear Vendor, but they don't make one that is big enough to handle the weight being pulled and I don't use the truck enough to justify the expense any more. It sits a lot, and only has 150,000 miles on it right now.
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CNCFAB
Joined: Apr 2020
Posts: 4,874
Likes: 2,006
So far of any builders injectors I have run, Rosewood is the only non issue set I have ever had.
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
If I had a choice between a not so good vendor with a great warranty vs a better one with not so good a warranty, I'd take the latter. Having to use a warranty on injectors would suck. I have a quote that I recite to vendors who try to sell me extended warranties...I don't want an extended warranty, I want a product that doesn't need one.
Cargo Master
Joined: May 2018
Posts: 2,442
Likes: 993
Swapped it out for a T4 set up a few years ago.
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
I am in no way discounting injector quality by any builder, good or bad. I have my favorite but I felt that the video clip fits here.
As an independent repair shop owner (one year as self employed last month!) and as an automotive/ag/heavy equipment tech for the last 26 years, this hits home hard. I constantly hear people ask if I'll put a lifetime guaranteed Amazon or low-buck parts store part on instead of OEM or name-brand. There are two options.....
You can pay me to do the job once for a little bit more now or you can pay me the same labor rate every time I have to change it.
....or I decline to do it since no matter how much I try to convince someone of the pitfalls of inferior parts, it will ALWAYS be MY FAULT that it doesn't fix the problem or the problem keeps coming back.
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
Originally Posted by Dan V
What good does an unlimited warranty do when you find yourself changing out the part every 3 months? Whether it be calipers, water pump or injectors.
I ask “where you getting these things.”
He replies “at (inferior chain) parts store”.
I say “why not get a good one at (my favorite local parts store)?”
He says “well these are lifetime guarantee and they’re giving me new ones for free.”
Me: “but aren’t you getting tired of swapping out this junk?”
Next time I saw him he no longer was swapping alternators. Finally decided his time was worth more than the purchase price and got one from the other store.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
The last (3) sets I installed sucked out of the boxes and zero help from UDP. Replaced one set with new AC codes and fixed problems. UDP ‘tested’ the junk injectors and said they were fine. You can 100% expect them to weasel out of any warranty claim. They will blame the truck, the tuning, the installer, the fuel, etc.
This is the ****ty UDP injectors that came in my sweetheart’s ‘new’ truck after a cold start. They told the previous owner to pound sand after reluctantly sending him one replacement that did not solve the problems.
