First off, that's an SR20, second the two dyno pulls were started at different RPM's and I am baffled at it starting at 1600 rpm.

I will have to test the .63 vs the .82 as I don't think the power difference will be that high, 30 hp, as on this SR20. I don't think I had that much difference in 5 housing tests and don't see the .63 losing that much, too many cars made big power on the .63 here.

I'll throw the .63 on I bought when I get the intakes tested.

 

Thanks Dave!

 

I did not say that. I said at 30 psi the difference in spool time would be (greater 4-500 rpm vs 2-300rpm to 20psi).

Unless you datalogged the SR20 on the dyno, or happened to be watching the boost guage and tach meticulously whilst it was being tested you have no farking idea when it hit 30 psi on either housing or if it even hit 30 psi........ so

you just lost an argument with yourself, keep it up.

Now i see why DB gets so furious with you

Scorke

 

DB,
Thanks for the reply. I talked to Robert at Forced Performance a couple of days after I posted this and he was able to answer my questions. FP received my 35R on January 4th for the upgrade. It was supposed to be a one week turnaround, but they still have my turbo and its been 4 weeks. I've emailed them several times and they say they are waiting on a shipment of compressor housings. It is getting really hard to remain patient but I'm hanging in there. I just hope it is worth the wait.

BTW, my 35R has the 3inch o2 housing outlet, not the 2.5, so I was glad to hear you like that option....

As soon as I get it back, it'll all go back together pretty fast and I'll be sure to post up how it does. If anyone has any pull at FP, please see if they can find a way to get my turbo back to me sooner...

 

[QUOTE=Smogrunner;5222246]DB,
Thanks for the reply. I talked to Robert at Forced Performance a couple of days after I posted this and he was able to answer my questions. FP received my 35R on January 4th for the upgrade. It was supposed to be a one week turnaround, but they still have my turbo and its been 4 weeks. /QUOTE]


^ and that is exactly why I havent done this yet.

Scorke

 

Good luck Smoggy, looking forward to seeing your new numbers. Let me know when you have it and Al is preparing for the tune so I can be there to watch please.

1wkdevo

 

This .63 vs .82 question would be a lot less confused if people would post this type of detail when they post their dyno results. For some reason this one detail is absent in almost every HTA dyno post I've seen. Mellon's thread is the one that really got me interested in the HTA35, because his is making like 200 whp already at 4000 rpm vs the 120 whp at 4000 I see on most of the charts, (also the cool video) , but when he was asked in the thread about a/r, he didn't know! The dynos posted by FP and Buscher don't say either!

I can see another area of confusion looming. As DB said he has tested about 5 different turbine housings. Not just different a/r but also different turbine outlet diameters. I gather that the 2.5 dia outlet housings are custom made for FP (not made by Garrett), whereas the 3.0 dia outlet housings are probably Garrett GT parts. For the Garrett GT housings, you can look up the corrected gas turbine flow charts for the 3 different a/r's. The difference in flow is a lot, for example at PR=2.0 it is 25 lbs/min (.82ar) vs 21 lbs/min (.63ar) - that's a 19% difference in exhaust gas flow required to get the same pressure ratio across the turbine blades. I would THINK that would make for more than a 200-300 rpm difference in spool. There are of course no charts for the custom 2.5" housings.

Anyway, it would be cool if the people posting dynos and so forth on their HTA35r's would go back and edit their posts to add the turbine a/r and turbine outlet size info. Yeah!

Gary

 

There are alot of people waiting on those compressor housings. Me being one of them.

 

I don't think there is a reason to edit posts about what A/R people are running.

To be dead honest, I see no sense what-so-ever in putting every single detail into a post so some guy can come onto the forums, read what I am doing and put his **** together on his own to duplicate what I have done.

If ANYONE wants the absolute best combination for what they are trying to do all they have to do is pick up the phone and call a REAL shop and place the order.

Its like asking me the exact details on our engine building specs or head porting, it's just not getting published.

Believe it or not some of us are attempting to make a living with this stuff.

 

From your standpoint, which is a business standpoint, yes I don't mind that you feel that way. I'm a Boeing guy and I know about the words "Proprietary" and "Intellectual Property" and so forth.

But if I buy one and post results on it, I absolutely will post my turbine a/r and outlet size, because those details may be helpful or at least interesting to the other buyers out there. That's what this forum is for.

 

I'm in the same boat as you. My tuner gave me his HTA 35R from their time attack car since they weren't using the turbo for a few events. I then sent my turbo in to FP thinking it would be a fast turn around, Robert said the upgrade would only take 2 days from the time they got the turbo. It's now been 3 weeks since they've had the turbo Sucks since I said I would get it back quick and I know they need it for their car.

 

^^What are you doing here?!?! This ain't no Subaru forum!!

 

I don't get hung up on a/r etc... I just buy what's proven to work and let the other's wonder about this and that.

 

i just took a ride in U2SLO's car with the hta 3582.....OMG....if you ever worried about lag, this will put your fears to rest. this turbo is insane...

now im split between selling my car or putting this kit on it!

 

That's what I said about this turbo. But people have no idea about what they will "accept" as lag, and "know" how this turbo comes on.