CHEAP LS TURBO TEST-EBAY GT45 vs SUMMIT S475 

Enjoying the videos Richard. It’s important work and consumer evidence you’re providing.

I Appreciate all your hard work. The fast lane to horsepower taking out the guess work..You rock DZ 302 was my first drag Motor in a drag jeep.

Thanks for posting these Richard!

I’m still learning and your videos are awesome and informative! I’d like to see single vs twin turbo setups and more specific 2 gt45 vs a bigger/more expensive single setup and pros/cons of each example

This is by far the best turbocharger video I have seen. Very informative and well presented. 👍👍

I personally find your vast knowledge invaluable Richard and learned more with your videos than any other on utube hands down. Thank you 1000% More nova please!!!

Great stuff Richard!!! Thank you for all the information you give us!

Awesome test. I had just asked if you'd do this test a few weeks ago. Nice video!!!!

Love the videos Richard. You should do a video explaining turbo efficiency maps and why they have falling boost curves.

Keep it up Rich, awesome channel, waiting to hear more data for the Buick Camp please..

Thank you 50 times over!!! I'm so tired of people on forums yapping about not bothering with cams or ports. "Why are you gasket matching, pocket porting and changing the cam? You are adding boost anyway, what's the point? " Because making your motor as efficient as possible will really get the numbers up there! A well built VQ37 making 450na will do 1050 at 20psi or 1.4 BAR. 20 PSI on a stock VQ37 might get you 750. That's a huge difference and less strain on the motor. People just don't understand, I would love to see twin gt45s vs twin 475s. Maybe a compound setup in the 4 liter 2jz type in the land cruiser!! Stock vs ported, built and cammed.

This is such great information. Thanks again for sharing your experience and wisdom !!!

i would love to see a turbo video on different size AR housings on the same compressor size and see how the different backpressures affect the boost rate. pleeeeeeease.

A very informative video! Thanks Dr. Turbo 😁

happiness is.... a new richard video!

Love the turbo videos

Oooooo that intro music sure got me in the mood

I would like to see the Summit turbo compared to Twin GT45 clones. I'm interested to see what going twins does to boost lag and torque. 2 x $169 = $338 which is still around half the price of the S475. Factoring in the extra cost of plumbing a second turbo might make this a better comparison money-wise.

Thanks again, appreciate the information and clarification, cheers

Great info , Great attitude. Thanks for all the vids

Great video. I can tell you’ve learned a lot since you did this test.

Another super informative video! Thanks Richard! Any chance you might cook up a video explaining ring gap and compression ratios for different power adders?

usually I just use compressed air to the top of the gate via pressure regulator to raise boost in increments on the dyno vs a bleed

Good info Richard....Your the new Turbo Guru.....🙏

Thank you so much for this and indeed all your videos Richard. Big up.

Please Richard, do the ebay 3582 water oil turbocharger. Single and dual setups. There are a lot of guys wanting to know your expertise about them.

Great video thanks Richard. Torque curves below 4000 is quite interesting, like your thoughts / comments. Both turbos look to be spooled by 3500, yet the Summit setup is still putting out more torque lower down at that point with approx .5 psi less boost, where the smaller turbo you would have expected held closer. I guess transient response may show differences with the smaller turbine etc, but is it simply the difference in exhaust restriction on the motor at that point? Thanks

You put 45min worth of info in a 22:45min video! Keep at it , I'm soaking all this up. Why? I don't know, I like it!

Godbless to you for making these awesome videos 🤘🏽

I understand!! Thank you. I have a propane powered Toyota 3TC with 87mm Weisco forged pistons and a Schneider turbo cam, MSD 6AL and CB performance Black box ignition computer. I should be happy with about 190hp with my 10lbs of boost. My little '73 Corolla will be fun! Driven it around the neighborhood un-tuned and it feels great.

I'm really liking all these turbo videos. I would like to see the difference with the turbo headers from ebay or a name brand if possible. Hoping to do a ls swap in a 3rd gen camaro soon with twins and I'm at the point of getting the gt45 clone for sure. Keep up the good videos

Yes! Great info, nothing but the facts!

Thanks Dan this really helped me, I moved recently and have this exact same grill, doing the conversion now, great info!

The one thing about the cheap turbos is, the sticky waste gates. Ive had 2 of them run away. Got the motor shut down before any damage was done, but something to watch out for! Awesome vid again!! Thanks

Very informative. One must consider volumetric efficiency of the engine as well as a turbo. At lower RPM and horsepower ranges the cheap one will do fine.... As things head to the higher end of the RPM spectrum it's going to fall flat. Like you said Richard the turbo must be designed to support the particular horsepower application.

Hey man I really enjoy watching your show, keep it up.

It looks like a pretty beastly turbo. I'd be curious to see the curve of twin gt45s any way you can test that?

I was hoping the turbos were going to be the same size so we could see the difference between the cheaper single journal bearing and the more expensive but more efficient ball bearing turbo. Hp, boost curve, ect....If you can make that happen it would be great. Your videos are very informative. Thank you!

Excellent turbo video.

Thanks for the video. How about an LS stock head vs one with the swirl ramp ground away?

Someone else mentioned AR variations and back pressure, I say yes please! The back pressure curves would be a nice addition to the info. It must have been quite high on the maxed out GT45, but it still followed the pressure ratio horsepower formula quite closely (looking at the boost curve at power peak). This begs the question, if both make the same power at the same boost but one has much higher back pressure, is it using more fuel or something to get there? You’ve mentioned the exhaust valves might not like the high back pressure, is there any other down side? Please do a test to show the effects of back pressure on power production with hot side variables like AR ratio. Thanks again, Richard, for the best channel on YT!

Hey I love your vids. You should make a detailed video or a how to turbo an ls. Im in the process of 5.3 swapping my 89. I wanna keep the motor stock and just swap a cheap turbo on it. Im a diy guy however theres not really a whole lot of turbo ls info. Just think it would be dope to walk us thru the general process of hooking up a turbo to a motor. Greatly appreciated keep up the dope vids man

Thanks @RichardHoldener another great vid with the info I need. I still think twin 45's on the stock caddy will my best route. Lock it at 6psi of boost. Would make a great fun reliable engine. Ebay has some big block chey turbo headers cheap. Like 140 bucks. I've got some caddy header flanges. Courtney said it's easy to make the swap. I'll have to modify my wheel well covers to make it work. I dream of turbos.

Have you done testing on the same size turbo but different kind of compressor wheel. "billet vs cast wheel"? Thank you for all the great work you are doing.

To quote Mr. Banks "it takes pounds of air to burn pounds of fuel". Air density is the key, -and if you run a compressor off of it's island on the compressor map, adiabatic efficiency takes a major dump. Heat the air and it's worthless. Great videos as always Richard, -I watch every one! Looking forward to Turbo Tuesday!

Could you do a test comparing a couple different blowers (size, style, boost) love the videos!!!!!!!

I ran a gt45 on our c5 vette worked great very good budget turbo

I would like to see some tests on how the diameter of intercooler piping, intercooler inlets / outlets, and intercooler cross sections affect IAT, EGT, etc. Something like 3 different sized turbos, 3 different sizes of pipe, and well, the intercooler inlet / outlet / cross section combos could become quite extensive. Basically the idea would be to help people decide, when it's worth the trouble to start cutting up body parts to make room for bigger "stuff", and when to just use what fit's easiest. Intercooler dragging on speed bumps -vs- limiting the tune to keep it safe.

What wastegate spring were you running ? That also has an effect on how much boost you can run with a bleed valve depending on if you didnt use the top port of the wastegate

Love your channel.I have an 03 Cobra wanted to turbo it was wondering if you wanted to do a build on it for you channel...

Cool vid good insight into performance world.peace

Would love to be able to do some work with you on some big block stuff! I’m working on some different setups for the future of my car

budget boost is a great thing

I had a 454 with a Mike Jones cam ( was ground for a street N/A) , got bored and set up headers routed forward and around to a single s475, no lag, great street killer.

Nice, so the eBay turbo will definitely do what I want to do if I control it properly... I have a stock 2007 PI 2v 4.6 swapped into my '99 lincoln...around 235'ish hp....wanna make around 335 or 350 ish, and keep it somewhat stock looking...My main goal is boosting the torque quite a bit and having a somewhat flat curve similar to the ecoboost using what I got.

good stuff man !!!

Excellent, i enjoyed it.

What dictates the hp/psi ratio is the V.E of your engine as long as the turbo can support it. The closer a turbo gets to its choke point and out of its efficiency range the less hp/psi it is going to make until it reaches a boost level where it will be at its limit and at that point it will only create static boost and no flow, even if you manage to maintain a fairly flat boost curve throughout the rev line. (as pressure ratio goes up flow goes down). After that point it will start to drop boost. Bigger turbos allow one to reach higher boost levels and still make power. This can also be said up to a point for more aerodynamically efficient wheels and with more blade surface area, in comparison to less efficient ones of the same overall size, a fact which raises the choke points slightly and can allow one to run a bit more boost through the turbo, but in turbos nothing can beat size in regards to making more power. Another good video.

Good job buddy

Nice S475 video in just 1 day response! Richard is that guy!!! 🙌🏽

Thanks Richard.

It would be interesting to see where you're at on the compressor efficiency map on both turbo's, but that information is not available on the ebay turbo. Maybe you could get some pseudo data by measuring compressor and turbine delta temperature?? ...that is if the temperature readings don't have too much lag time.

Richard Holdener first of all love your work and appreciate all that you do. Question : Would a good high quality turbo making the same psi at the same rpm be less restrictive on the exhaust side and would that equal more power at the same psi?

Great video

Good video sir. Looks like my s366 t6 should make around 600hp on the big block.

You can hold down control key while selecting files and it should open all the files at once.

Is there a web page where the test charts can be reviewed and studied? Awsome videos, I am a huge dyno test guy. Every time I dyno an engine it's like a years worth of real world education. Thank you for doing these tests.

Awesome video Richard. Would be interesting to see an A/R comparison and the difference that makes on the same turbo

Richard i always enjoy watching your videos very informative . i have a question to see what your thoughts are im in the process of building my headers for a set of 88mm turbos on a 351 base motor stroked to a 393 i had a thought would there be any advantage to run a cross over tube from both the turbos on the hot side and only using one waste gate for both im thinking theoretically the wast gate is only reading over all boost pressure that and running as once source of pressures hitting the hot side of the turbos and balancing out even amount of flow to both turbos maybe allowing more volume . just a thought thanks Bill

Richard, I'm looking to do a boosted 2001 corvette,and would like to get some tips on improving the fuel flow,so I can use the kinds of boost that you're getting with these turbo's.

The V-band flanges on the S475 would make it my choice. I prefer them over slip-on silicone hoses.

You should do a video with the one t4 88mm next. I'd love to see how close it can get to the 1050hp that it is rated for.

Basing it on cost, would you be better off doing a twin turbo gt45 clone setup vs the single summit? Instead of comparing like turbos, could you compare like costs?

Been watching your videos for a while now. Been going back to watch older videos of what pertains to my build. I’ve been working on my car for 2 years now. I’m ready to finish it but I would like to add turbos. Which will all be new to me. If I give you my build can you recommend turbos for me. I know you like the cheaper turbos to. That’s they way I’d rather go right now and upgrade later. Thank you for any help.

Great info Richard! How reliable are these eBay turbos under normal, street driving conditions, and if they fail, what general happens to the turbo? Sizing aside, is the Summit turbo that much better than the eBay turbos? Please, when possible, more test data, IAT, boost to backpressure.......Thank you!

Richard you have put out some really amazing horsepower numbers adding ring gap but I don’t remember hearing about o-rings. When does that become necessary?

The bigger the turbo the greater the threshold, and longer the lag. I think people get hung up on the "dyno queen" aspect of the big numbers, but lose sight of onset of actual power delivery, and where in the rpm zone that happens. Power under the curve is what works on the street and is infinitely more enjoyable that an on/off switch, long spool of a ramp. And when that takes a long time to develop, and even worse falls off at the top, that stinks on the street. My .02 c

Was a good video with good points... I think the only thing we have to worry about now with whatever LS Cam/Boost Combination is making sure to have a good enough setup so when your on the highway in your Corvette and some 16 year old kid thinks he's cool in his Honda Accord/Civic with a Coffee Can exhaust, let's just all pray that your LS platform is squared away enough to put up its defenses to fend off the Honda once it's VTEC✌️Kicks in✌️ 🤣🤣🤣... hahaa my favorite "I don't know anything about cars, car guy " performance lingo I've ever heard ... and now, me and the mad scientist have to rip apart the block and replace the piston rings you fried! ○ 🔥 ○ 🔥 ○ 🤣🤣🤣... humor for the day. Great Videos! 👍

Hey Richard, thanks for this video. This is what I've been looking for. Now I feel better about my purchase of a s475 to run with a 451 stroker. If you're ever able to run a bbm with a better than r.v. platform i know it will be very well received. You'd probably be responsible for a shortage of s475s 😆... again thanks

Great vid

Richard, what psi should I think about other than pump gas 91 here in new mexico???

Damnit Richard. Why did you have to post that tonight? Instead of listening on the way to work in the morning, I’m gonna have to watch it tonight. I guess I’ll just listen to it again in the morning anyways. Lol. 👍

Would you be able to add more data to your runs? I'd like to see things like IAT before and after your air cooler, exhaust pressure. Things of that nature.

Since I have a Summit s475 sitting in the floor of my office going on a 6.0 with P&P 243's and a BTR stage 4 turbo cam with LSXR ( per your intake video) , I am looking forward to seeing what the max output is going to be.

So if im shooting for a daily driven occasional street pull 700 rwhp which would be the best route? Will more then likely be running flex fuel as well as e85 is only had at a few places

Can you do a vid to see how much power you can get out of a 302 na none stroker

Thanks for this one! So..... the summit wins the big hammer competition, but what about response? Would you think that cheap ebay turbo would spool faster on the street? Is ther an efficiency or backpressure advantage?

I really wanted to see the video of the test them turbos spinning

Shop air applied instead of a controller maybe?

Great video next time electronic boost controller with back pressure sensor

Have you tried running longtubes with turbos before? I'm curious as to how they'd do vs OEM manifolds.

Great video, what engine management do you use for these tests

Put a Ebay turbo on my buddies mustang and he drove it hard and he went 77,000 miles on the turbo before it started having a little play in the shaft. For $163 that's not bad for the milage.

Hey Richard, you should start taking donations to build a turbo engine and dyno test it. You could let us all vote on what you would build. (5.3LM7!) But you could also make some extra$$$! Just a thought. Love the channel bro! Keep it up!!!

Do a test with 2 of the $100 GT3582s on a 4.8

Hello Sir. Have you ever had any experience with the VS Brand turbos on ebay? I am in the process of spec'ing out a twin turbo build and have been going through all your videos, of which i thank you immensely. I really want to go the mirrored or symmetrical design twin turbos for visual purposes. I have found a few but ,$$$, NRE and Precision. Maybe worth a video or discussion about VS as an option?? March

Disco... disco dyeeeno... Seriously: Thanks for the great vids. How about a 454 with cast iron exaust manifold and direct mounted dual GT45. Then test 3 cams for the lowest back pressure while making 900HP

I'd be curious about throttle response between the two.

I'm wanting to make 750 hp on a 5.3. Can I do that with a gt45 at 15lbs of boost?

Can you tell me what size bolts you use to hold an LS engine block to an engine stand please? Thred and length. Picked up a stand but was no bolts. Been decades sence I have used one and don't remember the bolt size. Lol. Thanks.