Just to confirm... I helped out with the tuning of these two cars and I was very impressed with the performance of the FPEvoGreen. I was shocked by the power we were getting out of these cars with ZERO knock counts up top. If I had the cash I would be putting on the car next week....

 

Sir, many factors can attribute to someone's set up not being able to hold boost.
I am 100 percent sure it is not anything to do with the Turbo.
The turbo is just part of the whole set-up. The rest of the parts and tuning also play a very important part of picture.

Take a look at this 2 pictures. The 1st. one is I log I made on my E-01 of Boost vs RPM vs A/F. In this one you can see I peak at 29 plus psi.
The 2nd. pic, you can see the boost still holds at 26 plus psi at over 7900 RPMs.
Also, take a look at the boost line on the top. Flat as a waffle. And the A/F line at the bottom. Also flat.

Now, if I can hold 26.7 psi at 7900 rpms in the small 04 Turbo (9.8 Host Side), why would you think the 20G LT can not do it?
And, I got small cams 264/272.
I bet you if I did not show you those pics, you would not believe me.
Now you can see it can be done.

I ordered the 2G LT last Tuesday. As soon as I get it and install it, I will tune it. Then, I will log it. I am very confident it will hold 30 plus psi, .

 

dude... you're spiking to almost 30 psi.... and then claiming a 4 psi drop is something we don't know about.

razor is talkin' about makin' 21 and holding it to redline like a real 49 pound per minute turbo ought to do, not spiking to 4 psi overboard so it can drift down to the target psi where the intake temps are now sky high and you uber****edyourself on your tune on pump gas with the huge *** hot air spike

 

My dear friend, first, it is not 4 psi drop, it is 3 psi drop (29 to 26). Take your time, and count with your fingers. And, this is not on pump gas. It was on 110 as you can see the A/F's are 12.1 from the begining to the end.

For the part that you missed, all I am saying is that the small 9.8 turbo can do it.
And , that I am 100 percent sure if it can be done with the stock one, It can be done with the LT. If you don't think so, come back in two weeks, and I will have new logs of the LT.

And, no, you probably have never seen a log like this. That I am sure. There may be a few others that can show it, but not many. If you know someone personally, show me thier logs. I showed you mine and you thing this is a piece of cake, lol.

 

you're right it's not on pump gas... but note what he was talkin' about 21 psi... do you run that on 110? no you don't. what would be required (spike, now you count with your fingers) to hold 21-22 on pump gas? and is that safe???

 

Listen, it is easy to run 21 psi and keep it at 21 psi by red line on pump. With a good boost controller and no boost leaks. A good BOV and finally a very good tune. I run 24 psi on pump daily. Been doing that for 2 plus years.
And, let me ask you this: Why would you need a 20G LT if you are going to run 21 psi peak. Safe yourself some money. The stock 16G can hold plenty and make good power. I make 359 and 381 Tq. on a Mustang Dyno with the small stock turbo. I want more. You are happy with 21 psi. Clearly this turbo is not for you or your friend. I am sorry. Think about it! Merry Christmas, .

 

Can you please tell me WHY you don't want the spike/taper?? That is exactly what I think a small/medium size turbo should do - give you a big fat kick of torque in the low-mid RPM range and then a little taper toward the high RPM.

Let's say you can run 22psi at 7000RPMs with zero knock. You now have a choice of 3 boost curves - one that tapers down to 22psi, one that tapers up to 22psi, and one that stays a flat 22psi all the way across. I know which one I would pick - the one that will give me the most torque while still hitting 22psi up top.

The only time this would not be good is if your car is very prone to knock at 3000-5000 rpms. I don't think most EVOs will have a problem. I remember when Buschur was testing all his stages on the RS running pump gas and was spiking the stock turbo really high, like 25-26psi, and then falling off to ~17psi up top. Heck, the EVO is even set up from the factory to hit a spike and then taper. Maybe Mitsu doesn't know what they are doing?

The only time I think I would want a turbo so big that the boost keeps going UP with RPMs would be for a dedicated drag car or highway racer - when you don't care what kind of power you have under 6000 rpms. Then you can have a powerband like a big turbo'd Honda or an FD.

That's not what the 16G/20G/FPGreen is made for.

EVOlutionary

 

Where do you see this turbo not holding boost? Look at the bottom graph the red line is my friends baseline run before the 20gLT, look at how it hits peak boost and the steadily falls off. Now look at the top dyno sheet, you can see that my boost hits and holds steady for much longer than the stock turbo. Also i am on the stock BOV which may be leaking, i am going to replace it soon.

 

In the graph above, the 2nd one shows a peak boost pressure of roughtly 22.5 psi, then tapers down progressively and somewhat linearly to around 20 psi by 7000 RPM. I am guessing that was on the stock turbo. That is a 2.5 psi taper. You can run 22.5 psi on 93 octane, SO, if you could get this setup to run 22 psi solid all the way to redline you will pick up power. Your lb/min will be higher and therefore you will make more power. The same goes for you new turbo.

The first graph shows a pressure curve that seems pretty good. It does however start to taper down pretty bad starting at about 5400 RPM. It tapers down roughly 3 psi over a 2000 RPM window (5400 to 7400 RPM). If you can get this to hold solid at 22 or 23 psi to 7400 RPM, then your peak power will go up. I was able to do ELIMINATE the taper completly and picked up 3 lbs/min. (38.7 lbs/min to 41.5 lbs/min) by doing that. This was done on a White Rabbit Evo 9 turbo (same as 20G-9-5 except with TME internals) . 3 lbs/min with everything else being held consistent, is roughly 30 hp. So you could possilby pickup another 20 to 30 HP using the same gas and tune, just by getting a better boost controller.

Thanks
Brian

 

what boost controller are you using?

 

bump for the answer

 

Hey Scott & turbodawg, hows it going?
Scott, I'll let you know when I come up there.
I've got a question. Since I was up there (the Dragon) with you guys, I've added an AEM EMS to my car. I'm ordering a complete BR 20G9LT w/ 880cc injectors after new years. My question is this,I'm currently still using a Forge MBC, but want to go with a a Greddy boost solenoid that will plug into my EMS, ant thoughts on this? I was going to go w/ a GM boost solenoid, but was told that the Greddy is much better and has a default mode should it fail that will allow you to still make minimal boost.
I'm planning on using this turbo set up for road racing (just did my 1st rain event w/Robert aka:ROBISPEC) and street driving as it should have same quick spool up but more power all the way up. You guys saw how well my car was doing up there, how do you think this turbo will work in my application?
Keep posting your results, it's been very informative

 

Funny you ask that... I'd just PM'd him on the issue. Seems I remember reading somewhere it might be something he, himself has cooked up, or is involved with.

I really don't see any evidence that this turbo does not out perform all OE Evo turbos. I do see people ignorantly posting up that they have "higher" dyno numbers than this turbo... yet are posting different "numbers" from a different day, on a different dyno, possibly different conditions, from a different car. All UTTERLY meaningless...

 

I am running a hallman MBC, is there another i should be running? Also I am still on the stock BOV, this may be a problem because under a load pull yesterday in fourth gear i could hear it fluttering open and shut. I will be ordering a new one tomorrow.

 

i still have some fine tuning to do, like porting out the hotside and a new BOV. But that 326awhp was acheived on a Dyno Dynamics dyno, which reads very low. This number could read as high as 370 on a dynojet if you want to look at it like that. Dont forget that my friend put down 355awhp with no meth on this turbo, I feel like these are very strong numbers and trust me the car is fast! Fast all the way to readline.