Max out a cheap 100 dollar ebay intercooler instead. 31x12x3. Do a cheap vs expensive intercooler test.

DANG Richard is PUMP'n out the content! \m/

This was a great video, I loved the breakdown of the data!!!

The sound effects at 237 are phenomenal. Please keep that up. Its a disconnection from a lecture!

Follow the science. Great work Richard, thank you.

Turbochargers are sized for a given air volume just like a supercharger is.

Just what I need to know! Thanks Richard

Also Rich, 800 HP is a damn good combination for a hell of alot of tire smoke and speed in a 69 Camaro or a box Chevy Caprice. I'd LOVE to get a 67 Olds 442 hard top and put this 5.3 into it with the turbo.

Keep it up Richard!

Definitely waiting for that video of boost controller setups

5.3L with a turbo has got to be the best bang for the buck period.

Backpressure is aiding the gate as you've stated in the lower flow ranges.

I'd like to see some drive pressure referenced wastegate tests. Essentially just a spring holding the wastegate shut

thank you Richard 🎉

What happens when you max out your ebay turbo? You buy a second one. 😉

Very informative video

Do you have any drive pressure or back pressure numbers for this combo?

Always a thumbs up

Now if you were to increase intake flow and the motors VE the turbo should keep up a bit better as you can make more dome pressure at less boost with a better flowing motor

Do a video on wastegates size for your motor and blow offs please 🥺

Love this test, now let’s see the same but with twin gt45 turbos

Do a test on the holly hi ram air to water cooler intake on n/a engine

Fantastic video! I'm pretty sure I'll be having this problem with my PTE 7675 CEA on my iron 6.0..... just didn't want to go T6 and bumper exit on the car. We'll see in the spring!

The phrase we are describing is volumetric efficiency. Just because you spin blower faster does not mean it has more capacity.

I don’t know if you have done it but can you do a e85 vs 93 being n/a. I got a 4.8 cammed stalled fbo stock compression, would I gain any going e85 or should I stay 93.

I wonder what the drive pressure is compared to the boost pressure

High Richard, I have run into a issue where my gt45 doesn't spool up until about 3300rpm on my lm7 then it takes off like a rocker. You look like you are getting boost sooner. I have a similar setup.

2 of them would be so much fun

Right at 800 hp 800 tq now that would make almost anyone happy for a street ride, toss in some 2.73 or 3.08 gears to take advantage of that tq peak and enjoy it

Hi Richard. So I saw your discussion of showing how you know the turbo is maxed out by looking at the boost curves. So the boost falls off at the higher engine speeds more quickly, because the turbo won't support that boost level at the higher engine speed. If we just had a dyno sheet to go by, we would notice the torque curve falling quickly. It's very clear. In your dynos when you raise the boost levels incrementally, the torque curves moved up perfectly until the last curve where the torque fell off quicker after 4000 rpm. I f you would've gone up yet more in boost, that fall off would be more pronounced.

Twin gt45s on a 5.3?

Similar build but using twin gt45s

PLEASE DO THE 5.3 SUMMIT RACING CREATE ENGINE ON BOOST. I WANT TO KNOW IF THAT CREATE ENGINE IS GOOD FOR ME I WANT TO HAVE A TURBO ON A 5.3 RELIABILITY IS AN ISSUE

I can use this for my build 👀

Where is the restriction occurring, at the compressor inlet or turbine throat? It will be the minimum area that limits mass airflow. Once sonic velocity is reached, no more air can flow regardless of how hard it is being pushed. Auto racing sanctioning bodies regulate the power by putting sonic orifices or restrictor plates on the cars.

What if you place two turbos in action with that combo?

Can you do lunati cams on the 2v 4.6

If you run the same test on a non ported head and truck/ls1 intake 5.3 combo I bet it’ll take more boost to get to that same hp/tq number. Which tells you boost is just a number depending on flow and restriction.

id like to see a billett GT45 comparison

Please do more nitrous 5.3ls but this time progressive

Richard, with the trend of twin turbos, how would twin GT45's do? I'm assuming less exhaust going through each turbo(one bank per turbo) would allow more rpm before max-out of airflow, while still building boost?

That's going on my race truck!!! "Turbo Flo-No-Mo!! Damn Richard, you're killing me!!! I'm starting to think I'm going to sell my BBC, and buy a 5.3 junker and put a cheapo turbo on it and make more frickin' horsepower than the big block can ever dream of making for the money!!!! Stop doing this to me!!!!!

I wish you'd logged the back pressure

So Richard , are saying this turbo is of poor design compared to a good turbo ? Or is this a size problem 🤔 . Lol , you're the man 👨 👍

My take away, and PLEASE correct me if I am wrong is that an undersized turbo would make for a more streetable combo for those of us not trying to make 4 digit or for that matter even high 3 digit numbers. For me, well the wife, since she has claimed the damn car two days after I brought it home. As an example, a E30 BMW with the mid size open diff. We are looking for passing performance more than drag race, as that is a great way to find the weak link in anything. The idea is a mild or stock cam, same with boost pressures on a stock 5.3. Daily driver that is reasonable quick, but still a wolf in sheep's clothing, no big lopey cam, no loud exhaust. Something around 500 HP would be awesome, but even a stock 5.3 ought to be a rocket compared to the stock 127 HP.

Lmao @2:47

Back pressure curve? Is there a chart or formula to suggest a good street combo? Obviously, AR ratio and turbine size affect it, as compressor size and mass flow affect horsepower. Is balancing everything just a trial and error exercise?

Richard great video!! Is there a recommended turbo size chart? Where can I find what size turbo I need for the size engine?

Hello this gt45 turbo whats mm whys the esact parts number please

When are you gonna try one of the new electric waste gates? Wouldn't that help the boost curve not fall off so much?

Time to twin turbo?

why no test run clips?

Does this apply inversely? Smaller turbo to increase torque in the low end of not as concerned about the big end?

I get that the turbo is getting to its limit, but I'd say that single 3.5" pipe is also past its limit.

I think this test is inconclusive. I think that it needed the exhaust back pressure to be monitored so you could know if the back pressure was over whelming the the very low base spring rate and intake pressure ratio.

So iv been slowly acquiring parts for a similar build but i wanted to do a 6.0l or 6.2l and twin ebay gt45's because i assumed the 5.3 would be working way more to spool them causing it to be laggy (although iv considered using a 5.3 since i havnt had any luck finding a 6.0 or 6.2 in my price range)

I’d really like to see the difference in a2w vs. a2a Intercoolers. Obviously the a2w is gonna shine, but I’d like to see how bad the a2a would do

What about adding nitrous on top of a small maxed out turbo? Does the restriction in the turbo reduce nitrous effectiveness?

Richard I know you're busy one more time I have a 03 5.3 l I want to hear twin turbos you told me the numbers on them but I don't know what wastegates I should get or boost controller it's a sloppy stage 2 cam or 706 heads stock bottom in I'm going to put the head bolts rod bolts etc

👍💪

Wish you had a speed sensor

Respect for holdener... until I make a mistake on it and blew it up ... honestly

If a single GT45 can support about 750 HP, could twin GT45s support double that? Or is there not enough exhaust volume to drive them both that high?

Would be great to use the Superflow Airflow turbine to measure airflow into the turbo. then can plot against the compressor map. Jordan

" Diminishing returns" kinda sorta ?

What would be a direct replacment inexpensive turbo for the Gt45 that could make more than 800hp?

The one thing i learned from this video… is i need a bigger turbo. Lol

What happens to air volume when timing is reduced? if your turbo is maxed out at 30 psi and 6600rpm and you remove a few degrees of timing will the turbo still be limited in volume at those same numbers?

WAHHH!

Music to the ears

Question? Soo.. I assume for consistency. We would Ideally want no turbo pressure drop at the top end... what would a realistic or acceptable pressure drop or window to stay within?

A smaller capacity higher revving motor will make more power with the same size turbo, but for the life of me, I can't think if torque is going to be less or the same? Boost pressure is going to be higher but displacement is lower👾 That's assuming that the displacement change is achieved via a stroke change only so different bore sizes don't result in shrouding valves etc. Also thinking that for a given motor, if cam lift stays the same but we go up on duration or area under the lobe, if we test at the same rpm sweep, boost pressure will drop even further but power would still of increased RPM for RPM. Theory needs a bit of testing.😉🙂

Is a 70mm turbo a good size for a 5.3 with a 212/218 600 lift 112 cam for about 500-550 wheel? I’m looking to just get a real responsive turbo

Oh, here's me running my HX35 at 36 psi (diesel). 😊

@Richard what would it do as twin GT45’s?

Was it the hot side or the cold side that was maxed out on the turbo?and how would you know?

Please do dual GT45 also.

Let me guess A/R ratio .89 .

so how do you know if it's an exhaust or compressor side restriction/limit capping the power/limiting upper end boost?

Richard, looking for a 5.3 turbo combo that gives low end boost and power from 1500 to 3500 rpm where my old XJ6 will be driven mostly.

Hi .I have a bmw 645i, I want to convert, can you tell me which turbo it does and how much hp it will increase?

I actually think you just ran out of wastegate spring pressure, a nice test would have been to run a 14 psi base spring set to then measure the effects. I'm assuming your base spring pressure was the 5.5 psi starting point. Did you at all change the base spring pressure? You normally find unstable boost levels with very low spring rates.

Is this gt45 to small for an lq4? Thinking twin 45’s but afraid it would be laggy on the street. Already have the 6.0

So What if you add 1 more Cheap Turbo? is 2 Better than 1 ?

Couldn't you change that curve if you change the spring in the wastegate to a higher compression spring?

Does this mean I shouldn't buy wastegates if I want this turbo maxed out all the time?!? #MoneySavings

Working on what to build, if I add this turbo to my 5.7 and it's hp is500hp by adding this turbo that maximum hp is 600hp it will give me basically 100hp extra, then flat line at about 605 ish ? I'm just looking for a little something extra. Nothing crazy.

How would this build with a 6.0 lq4 summit stage 2 turbo cam work with the gt45 ?

Does this hold true for S/C when TQ is higher than HP? Thanks

So, are you running out of flow or is the wastegates?

Boost Ready is not the same as Rich-proof.

Couldnt you fix this problem by adding another gt45??

I was wondering why you bothered with a wastegate if you wanted to run the turbo to the end...then i thought what would happen trying to load in a 750hp turbo at 3500rpm without a wastegate.

Keep it at 6.4 with 666hp name it the hellraiser 😂

Would putting a heavier spring in the wastegate make it a rising boost curve as opposed to using the manual boost controller?

Idea! An aux boiler ran from engine heat to supplement exhaust flow to turbo. Can it be done?

Not a flow problem. Lack of second turbo problem. 😉

This explains pretty well why you need to pay attention to the compressor boost map and get the highest flowing turbine when choosing a turbo

Add that second gt45 and see where she goes. Lol

Let's see twin gt45s on a 5.3. Anyone have data? Video, info?