Don't call it a comeback, 420AWHP R.A.I. Motorsport GTX Dyno!!!

[Sales@RAI]

Customer's Car:

2003 B6 A4 1.8T 5-speed
- R.A.I. Motorsport GTX3071R turbo kit
- Stock AMB (small port) head
- Stock AMB Intake Manifold
- Stock Cams
- 1.8L (stock pistons, IE rods)
- Valves/Springs, stock port
- R.A.I. Motorsport 3" Exhaust
- 034 Bosch 055 pump, 725cc injectors
- Maestro Tuned

I just want to say, I'm blown away by this turbo. It makes me re-think what is needed in a 1.8T to make power. This car feels like a monster even at ~350whp and I'd imagine now it's even scarier on the street. These new GTX turbos are the real deal and they change the way the modding game works. Ray and I really have to sit down and re-think every build from now on. You don't need the crazy cams, big port heads, custom intake manifolds, etc when you have a turbo that is capable of such power. This build could be completed in a garage for around for pennies on the dollar compared to a monster setup and still keep up.

Stay tuned for more updated (like track times), but for now, check out the graph:



Check out our GTX kits here...

http://www.raimotorsport.com/RAI-B6A...4_1.8t_gtx.htm

PM me for more info!

Thanks,
Clint

[Stubek]

Impressive, but there is no low end power or torque any more. If every start is going to be a clutch dump at 4k, this will be great, but no good for a daily driver and having a little fun. Can you tune it for a little more low end, or is the turbo so big that it just needs that much exhaust to get it going?

[mushasho]

Does appear to be laggy, but peak numbers are impressive for such a minimal build sheet... Oh and is Bosch now producing a "055" pump?

[Sales@RAI]

Impressive, but there is no low end power or torque any more. If every start is going to be a clutch dump at 4k, this will be great, but no good for a daily driver and having a little fun. Can you tune it for a little more low end, or is the turbo so big that it just needs that much exhaust to get it going?

A few more mods could gain some more low-end power. We were wringing out every bit we could on this run. 419awhp on a pretty bone stock 1.8T is crazy though

[Seerlah]

What boost? I posted in a previous thread that this turbo is much more capable (this thread proves it) and get semi-bashed for it. Go figure! That turbo flows more than the standard GT35R. But I also agree on the power curve. Comes in rather late. Since it is custom ME7, I'm sure you guys can change that up.

[flynnr]

whyd you stop at 6krpm? that turbo should hold boost till 8k no?

[Seerlah]

That turbo is designed for a longer duration before drop off than 8k. Figure these turbos are also used for track junkies reving to 10k on custom V8 motors. Peak power is a different story, though.

[juxsa]

Impressive #'s but hell you only have 2k rpms of usable power. Astounded though that with a small port head and stock manifolds you could pull those #'s though

[biketsai]

Impressive #'s but hell you only have 2k rpms of usable power. Astounded though that with a small port head and stock manifolds you could pull those #'s though

X2. Very nice results.

[ZimbutheMonkey]

What A/R are you running on the turbine side? As others have mentioned, it seems laggy for having the same turbine dimensions as it's 3071r predecessor. Still though, it's good to see that it does dispel the myth that you HAVE to have cams and a big port head to break these kind of numbers.

Regarding the capabilities of the turbo, I think that the GTX3071r is the best of the GTX lineup. Reason being is that Garrett never changed the turbine flow capabilities on the hot side. At least this turbine was designed to accommodate the flow from both a 71mm and 76mm compressor. I feel that the GTX3076 compressor outflows it's 60mm hotside.

Also, what boost and fuel type was that run done with?

[M-Hood]

What boost? I posted in a previous thread that this turbo is much more capable (this thread proves it) and get semi-bashed for it. Go figure! That turbo flows more than the standard GT35R. But I also agree on the power curve. Comes in rather late. Since it is custom ME7, I'm sure you guys can change that up.

You must be thinking of the GTX3076r, this is the GTX3071r which is just a 54mm IND compressor wheel, rated up to 580hp and has a max flow of about 58 lb/min. That is well below a standard GT35r which is rated up to 600hp and max flow rate of 62 lb/min.

What A/R are you running on the turbine side? As others have mentioned, it seems laggy for having the same turbine dimensions as it's 3071r predecessor. Still though, it's good to see that it does dispel the myth that you HAVE to have cams and a big port head to break these kind of numbers.

Regarding the capabilities of the turbo, I think that the GTX3071r is the best of the GTX lineup. Reason being is that Garrett never changed the turbine flow capabilities on the hot side. At least this turbine was designed to accommodate the flow from both a 71mm and 76mm compressor. I feel that the GTX3076 compressor outflows it's 60mm hotside.

Also, what boost and fuel type was that run done with?

I think both of those have too small of a exhaust wheel. This might be why Comp Turbo offers larger exhaust wheel options for a compressor wheel that size, this helps reduce manifold pressure and allow more flow thru the exhaust wheel.

[Sales@RAI]

What A/R are you running on the turbine side? As others have mentioned, it seems laggy for having the same turbine dimensions as it's 3071r predecessor. Still though, it's good to see that it does dispel the myth that you HAVE to have cams and a big port head to break these kind of numbers.

Regarding the capabilities of the turbo, I think that the GTX3071r is the best of the GTX lineup. Reason being is that Garrett never changed the turbine flow capabilities on the hot side. At least this turbine was designed to accommodate the flow from both a 71mm and 76mm compressor. I feel that the GTX3076 compressor outflows it's 60mm hotside.

Also, what boost and fuel type was that run done with?

Pump 93 + meth. I agree it's laggy, we're going to try and figure out more with tuning today.

Also, boost is 37psi. I know everyone thinks that's wild but the more we experiment with these turbos the more it seems like Garrett really wanted to design a turbo that can push this high boost with no problems, and they did.

[M-Hood]

Pump 93 + meth. I agree it's laggy, we're going to try and figure out more with tuning today.

Also, boost is 37psi. I know everyone thinks that's wild but the more we experiment with these turbos the more it seems like Garrett really wanted to design a turbo that can push this high boost with no problems, and they did.

Problem with pushing so much boost is the fact that there just isn't enough adv timing to take advantage of all that air. There has to be a good mix of both.


At sea level 37psi is a 3.77 PR. That is pretty much at the top of its flow map and really pushing it into much lower efficiency.

[Sales@RAI]

Problem with pushing so much boost is the fact that there just isn't enough adv timing to take advantage of all that air. There has to be a good mix of both.

There actually is on this one. I have to look at the timing but it wasn't too bad. We don't really want to even try making more power after this so the next few revisions will probably bump the boost down a bit and even the timing curve out

[M-Hood]

There actually is on this one. I have to look at the timing but it wasn't too bad. We don't really want to even try making more power after this so the next few revisions will probably bump the boost down a bit and even the timing curve out

Its sweet spot is most likely going to be right around 28-30psi which would be in the 3.12-3.26 PR at sea level.

[Seerlah]

You must be thinking of the GTX3076r, this is the GTX3071r which is just a 54mm IND compressor wheel, rated up to 580hp and has a max flow of about 58 lb/min. That is well below a standard GT35r which is rated up to 600hp and max flow rate of 62 lb/min.

Yeah, I was.

[mushasho]

Customer's Car:

2003 B6 A4 1.8T 5-speed
- R.A.I. Motorsport GTX3071R turbo kit
- Stock AMB (small port) head
- Stock AMB Intake Manifold
- Stock Cams
- 1.8L (stock pistons, IE rods)
- Valves/Springs, stock port
- R.A.I. Motorsport 3" Exhaust
- 034 Bosch 055 pump, 725cc injectors
- Maestro Tuned

Is there a new "Bosch 055" pump out there?

[M-Hood]

Is there a new "Bosch 055" pump out there?

There is a Bosch pump that ends in 055, 0 580 464 055. But maybe what he meant was Bosch 005.

[Saskwatch]

not a b5.. gtfo with that ish..

just kidding.. Nice numbers...

[ZimbutheMonkey]

Clint, I didn't catch what the turbine A/R was. As for the pressure ratios that it was being run at, I'm not surprised. I was talking to the guys at Comp turbo and they were saying that the GTX series need to be run like that. The lack of secondary blades acting as a pre-compressor makes them less efficient at low pressure ratios. However, the fact that all 11 blades are full length gives it an advantage at the high pressure ratios.

[aysix]

lag city

[Trky]

You get 400 hp for a full 2 seconds. That doesn't seem impressive to me.

[BlazinB5]

cmon guys... of course it's going to lag like hell - just look at the mod list. there are a ton of mods that could be done to reduce the lag.

[Dan[FN]6262]

stock small port will make the turbo spool as quickly as it can. doing any changes to increase volume will reduce initial velocity and cause more lag. so no. it'll spool slower with more mods

[Sales@RAI]

Clint, I didn't catch what the turbine A/R was. As for the pressure ratios that it was being run at, I'm not surprised. I was talking to the guys at Comp turbo and they were saying that the GTX series need to be run like that. The lack of secondary blades acting as a pre-compressor makes them less efficient at low pressure ratios. However, the fact that all 11 blades are full length gives it an advantage at the high pressure ratios.

Yup, that's exactly right. These things can do boost like no turbo we've seen before

You get 400 hp for a full 2 seconds. That doesn't seem impressive to me.

I appreciate the feedback. I don't think I've ever seen another small port make anything close to this so we are pretty impressed. We can put a smaller turbo on and make more power if that's what you're saying? Bigger turbo = slower spool

[Dan[FN]6262]

Clint, you still didn't answer as to what is the A/R of the turbine housing

[M-Hood]

Yup, that's exactly right. These things can do boost like no turbo we've seen before



I appreciate the feedback. I don't think I've ever seen another small port make anything close to this so we are pretty impressed. We can put a smaller turbo on and make more power if that's what you're saying? Bigger turbo = slower spool

37psi isn't high and at that boost level that turbo is already out of its flow map. Even the HTA35 you had on your car could push 50psi. lol

[Sales@RAI]

Clint, you still didn't answer as to what is the A/R of the turbine housing

.82

[Dan[FN]6262]

I figured that was why it's so lazy down low, and why you can run that boost on a small port with stock cams.

[titsavant32]

Very impressive.......that lag is something else.

[ZimbutheMonkey]

Clint, if you're going to be lowering the boost, why not run a .63 A/R to bump the spool up some.

[Sales@RAI]

Clint, if you're going to be lowering the boost, why not run a .63 A/R to bump the spool up some.

I think we actually have one on the shelf too. We might. The customer has it now though so unless he gets tired of it, it's staying like this for awhile

[EErie B6]

Clint, if you're going to be lowering the boost, why not run a .63 A/R to bump the spool up some.

I would like to have seen this as well...

a same car spool vs output comparison would be neat.

[Sales@RAI]

I would like to have seen this as well...

a same car spool vs output comparison would be neat.

I actually like these tests a lot too. We might do it with cams as well

[thenj3]

i wonder if the .82 is why my turbo isnt really hitting until over 4k. i was expecting spool much earlier than that with aeb intake mani, ported head, and intake cam. but i have a lot of tuning to do so hopefully it comes down a bunch

[nunya]

i wonder if the .82 is why my turbo isnt really hitting until over 4k. i was expecting spool much earlier than that with aeb intake mani, ported head, and intake cam. but i have a lot of tuning to do so hopefully it comes down a bunch

My 5557 (same turbine) with .63 full spools at 3700, big port, ported, bowl blended, cams, larger exhaust valves, etc. The .82 isnt something i would recommend for these motors.v Just my 2cents.

--dillon

[M-Hood]

i wonder if the .82 is why my turbo isnt really hitting until over 4k. i was expecting spool much earlier than that with aeb intake mani, ported head, and intake cam. but i have a lot of tuning to do so hopefully it comes down a bunch

Yes, but what you gain in spool with a .63 you will lose in the top end when pushing that turbo to try and hit 500whp.

My 5557 (same turbine) with .63 full spools at 3700, big port, ported, bowl blended, cams, larger exhaust valves, etc. The .82 isnt something i would recommend for these motors.v Just my 2cents.

--dillon

Yes don't ever put a .82 a/r housing on these motors because you might end up making 600+whp.

[nunya]

Yes, but what you gain in spool with a .63 you will lose in the top end when pushing that turbo to try and hit 500whp.



Yes don't ever put a .82 a/r housing on these motors because you might end up making 600+whp.

I hear ya mike but not everyone is looking for a dyno queen or drag car. I am not calling yours a dyno queen BTW. I would call the above GTX dyno sheet one. I tend to like my 4500 RPM's of power band.

--dillon

[mushasho]

Correction... don't use a .82 if you're gonna wimp out and rev to 6200rpm... specially on a stockish' head

Sent from my NexusHD2 using Tapatalk

[nunya]

Correction... don't use a .82 if you're gonna wimp out and rev to 6200rpm... specially on a stockish' head

Sent from my NexusHD2 using Tapatalk

true, but using a .63 and having 4500rpm of similar power is nice as well. To each their own.

--dillon