It may seem odd becuase we did the 19PSI run first, then I decided to crank her up to 22. The 12PSI run was for ***** and giggles.

 

I posted the timing, everyone agreed that it looked good. The air fuel readings are on the graph and they are spot on. The compression was tested and came out good.

The boost reading are written in becuase there was something weird with the software and Dave could not rename the files, we had a run that was deleted because the RPM values were off.

Before everyone makes assumptions maybe I should run it on another dyno to see what it turns

You know what? Screw it! The car runs awesome, looks good, handles good.... and IMO is one of the nicest and properly done FD's on the road.

 

I was using my turbo timer to read the boost on the dyno run. I did not have a mechanical gauge installed. I did install a mechanical gauge tonight, and, I do have some boost control issues that were not noticable with the turbo timer gauge. Sometimes I will flatten off at 20PSI and other times I see 22. There is a noticable power difference. Nothing major though.

I have my Profec B cranked all the way up. I think I need to maybe adjust the wastegate spring? I do have the highest spring already in the wastegate.

Maybe it is time to get a new boost controller?

Something to think about before we assume that the GT40R kit sucks.

I am anxious to see some other dyno runs from other Forum member's cars.

 

Is it a spec 2? your boost controller? You may need to get a different wastegate spring. 2 psi is a big difference on a big turbo like that. If you can, try to get your hands on a blitz sbc-id, they hold boost a bit better then profec b's from what Ive seen on some friends supras running 20+ psi. Matter of fact my friend john has a 1jz mk3 making 600whp on a to4e, he is selling his profec b because it isnt holding boost as well as it should be...I believe he is getting a sbc id..

 

I think that may be the issue here and explains some of the max HP readings.

At 22PSI you can hear the turbo whistle in the air cleaner, not soo much at 20. So, maybe the sweet spot in in the 20/22PSI range?

No, it is the old version I assume. It is two and a half years old now.

 

If its that old..., *rarely* do the solenoids go bad, and dont react as quickly, but it does happen. Seriously, try to locate a sbc-id. Wish you lived near me, id lend ya my spec 2( pretty much brand new). Yes, a turbo that size is going to love higher boost levels How does the anti surge compressorhousing sound? Like a t51?;p

 

without a doubt the Blitz SBC-id is the best boost controller out there.. they hold boost rock solid!

 

Yup, I had a chance to get one for 250 bucks but I buggered that deal up, when I decided to keep my stupid manual turboxs DSBC instead...damnit in hindsight I wish I bought the sbc-id. Just goes to show what happens when you are a n00b.;p

 

You can really hear it at 22PSI, I never heard a T51 before, but I have heard a T66 and it is not quite as loud.

 

t51= sound like a damn jet taking off...

 

No, not quite that loud.

On a side note, I am going to try and jump on the dyno again later this week since I now can monitor boost more accurately.

 

zkeller,
I realize that some people are giving you a hard time, but it seems like you're happy with it. I have a couple of questions for you though. How is the boost response? Is it good for a drive around town? Congrats on the numbers anyway. KDR did my car, and I'm happy with it.

 

Thanks RedX7. Boost response is good for the size of the turbo. Driving around town is fine. Not like the stock twins, but not laggy. 10PSI comes up at around 3500.

How's the anti-det working out for you?

 

Hey Zach,

Congrats on the good results. Glad to see my help finally paid off.
The SM2 is treating you good now. LOL.

I got a dyno dynamics dyno so if you want to make a few passes on it your more then welcomed. You just got to stop by the NY area.

Good work Zach!!!
BTW. Send me your .cal file so i can have a look at it.

 

Sounds awesome. I'd love to have 450+ horses to play with. I plan on going single in the not-too-distant future. The anti-det was working great until a faulty 1300cc secondary stuck shut while boosting. Front rotor was fried. Thank God for warranties. Good luck with everything.

 

the problem doesn't seem to me about kdr's dyno, since your 12psi run made good numbers. the problem with the 22 psi run is the power doesn't crown properly. if you look at the your other runs, the power peaks in a nice smooth curve. the 22psi run starts out like a rocket then flattens out like a pancake. if you extrapolate the same peak curve of the other 2 runs on that one, you've got an easy extra 15hp. as to what may have caused that, i don't know, maybe you were leaking boost. and as to why your 19psi run is so low compared to the amount of boost that remains a mystery, maybe your boost reading was off.

 

I have been away for a while. Anyway. You are correct. It was not holding a steady 22PSI. I found the wastegate spring to be too small and boost was not steady in the higher range. All that is fixed now. I need to crawl back onto the dyno. Since I fixed the boost issue, the car pulls much better. I think it is safe to assume that I am closet to the 500RWHP range now. The dyno will tell. I will repost my findings.

I know I am going to gynx myself, but I am just happier than hell that I made whole summer on the same engine! And I have been driving her real hard everytime I take her out. I think it has to do with A: Running at least 100 Octane all the time, proper tuning, and the right ECU, fuel system, intercooler,etc.

 

That's great to hear! You are now probably the only one I know of that has had such great success with the GT40R. Hopefully the dyno can confirm that!

 

What problems have others been having? I love the setup. Now my biggest problem is the breather. I had to tap the filler cap too. I ran two 6AN hoses, one from the filler cap, and the other from stock location.

I can smell the crank breathing when letting off! Have to empty the catch can at least once every other fill up.

At 20+ pounds of boost, you would not believe how pressurized the crankcase gets 8>)

 

That worries me.

 

I have a similar issue with my set-up of the GT40R kit.

I have a make-shift catch-can off the oil filler neck that fills up with a light gas smelling liquid (actually looks mostly like gas)....... I just empty it out regularly and change the oil (smells of gas badly) every 1K or so.

I just thought this was blow-by due to low compression on the engine past the side seals.... I have had the compression tested (Mazda digital tester) and got 6's all around - both rotors. Ianetti Apex seals probably don't help much here and the engine has aboout 2.5K on it.

Any other theories? What do other single set-ups see?

Why would this phenom be associated with the GT40R exclusively?

 

Why would this phenom be associated with the GT40R exclusively?[/QUOTE]

I do not think it is just with the GT40R. It's the high boost that makes the need for the breather. And quick high boost with that mean bastard of a turbo.

I have heard a guy talking about a high boost car that had a vaccumm pump on the crankcase breather. Don't know the validity of it nor if it was a rotary or not.

I think proper breathers are overlooked. And it needs to be vented to atmosphere, not tied to the intake of the turbo.

I was thinking that the turbo seals were shot when I saw a nice cloud of white smoke on deceleration from a hard run. It's all gone now with the hot rod breather set up I have.

I was told that it is the abrupt transition from boost to vaccumm that causes the engine to pull oil into the combustion chamber, bacause at that point of transition, the crankcase is still pressurized. The breather vents the pressure to atmospere.

 

Why would this phenom be associated with the GT40R exclusively?[/QUOTE]

I do not think it is just with the GT40R. It's the high boost that makes the need for the breather. And quick high boost with that mean bastard of a turbo. And my compression is great.

I have heard a guy talking about a high boost car that had a vaccumm pump on the crankcase breather. Don't know the validity of it nor if it was a rotary or not.

I think proper breathers are overlooked. And it needs to be vented to atmosphere, not tied to the intake of the turbo.

I was thinking that the turbo seals were shot when I saw a nice cloud of white smoke on deceleration from a hard run. It's all gone now with the hot rod breather set up I have.

I was told that it is the abrupt transition from boost to vaccumm that causes the engine to pull oil into the combustion chamber, bacause at that point of transition, the crankcase is still pressurized. The breather vents the pressure to atmospere.

 

6's all around? And you think thats good? Its NOT!!! thats very low. Sure your issue is fixed?

 

And to back Sean up, from other posts too. The 40R is internally restricted. You do NOT need to add another restrictor! Breather damn it, breather!