Need Help with Turbo component selection

Post by **DammitBobby** » Sat Jan 13, 2007 3:58 am

Yes I have searched alot but still have questions.

Problem I am not happy with the performance of my car.

Problem 1: Boost response from around 1.5k is around 3 secs.

Problem 2: Lag seems long too.

Problem 3: Car use to with rebuilt stock engine break tires loose in 1,2,3 gear. Now only when dumping the clutch at 3.5k in 1st gear and then if I don`t shift quick enough it bogs down.

Idles no problems with -20 vacuum. AFR around 11.5 and timing set to stockCar specs:

Engine rebuilt with AMS basic kit and ARP hardware with Felpro head gasket.Butterflies eliminated91 exhaust and intake camsJWT ECU 72lbs programSAFCIIZ32MAFZeitronix with electronic boost gaugeMSD coilFMIC 3x24x63inch downpipe and 2.5 exhaust

Current Turbo T3/T40E StageIII with .48 AR (That is all I can remember I think it is a 57trim but not sure). Compressor is .60

My Goals are to run 93 octane gas and beat my friends 98 Trans AM with NOS in the 1/4 mile. Just basically put a smile on my face when I hit boost and not have to wait forever!! I think HP range needs to be around 350 to 400. I want to be able to drive this thing to NOPI in Atlanta this year! I am tired of driving the SLOW ROLLA!!

T3/T40E .63 A/R Turbine , Stage III wheel and 50 Trim.This turbo seems to fit my needs but my question is this for the turbine side only? Do I need 50 Trim on the Compressor side?What size is A/R on Compressor side?Stage wheel on Compressor side?

I plan on going to Buhl AL and have them change the turbine housing and trim. I have to give them exact specs that I want on both sides of the turbo.

I know this may not fix my problems but I decided that if I am going to reach my goals it is not going to be with current turbo selection. The other thing I am going to check is the cam timing.

Post by **C-Kwik** » Sat Jan 13, 2007 11:06 am

Check for an exhaust leak. When my turbine or wastegate loosened, it would experience a similar problem.

Post by **WDRacing** » Sat Jan 13, 2007 11:20 am

With that turbo there shouldn't be any bog, and spool should be pretty damn fast. I have the same turbo, but in .63 AR hotside and I love it...or loved it...sniffs. Anyway, Gregs Vert is about the same setup as you, componant wise anyway and his car screws. Sideways in 1-2 breaking traction a tad in 3rd. I don't think the issues is in the turbo Bob. Do what Chano suggested, I had somthing like what he said. Mine was an actual crack around the wastegate pipe. I didn't notice it because I had a pre-existing exhaust leak.

WD

Post by **DammitBobby** » Sat Jan 13, 2007 4:13 pm

Yea when I took the turbo off the Dam metal T3 gasket blew and blocked part of the T3 port. Other problem was I lost one of my wastegate nuts. It really reminds me of the 69 MachI I I owned back many moons ago! No I really don`t think the turbo is the problem I just wanted to get one that will meet my goals when I get everything fixed. I think I have another problem besides the one I mentioned. I really wanted to make sure that I know exactly what I want when I get my turbo upgraded to avoid having to do it over again.

Post by **WDRacing** » Sat Jan 13, 2007 6:44 pm

Well atleast you know what it is...

Post by **NateDogg** » Sat Jan 13, 2007 9:51 pm

Swap out for a .63 or .82 A/R turbine housing and you're set!

I would recommend the .63 A/R. It has optimal response for under 450whp.

Post by **DammitBobby** » Sun Jan 14, 2007 3:40 am

I haven`t seen anybody running a .82 A/R on this forum. Would be interesting if anybody had some experience with that type.

Also haven`t heard anybody with info about Compressor side.

Post by **WDRacing** » Sun Jan 14, 2007 7:35 am

Here's the turbo and the info. This will come with a tad more lag, but nothing close to a full T4. But it will definitly free up exhaust flow in the upper ranges and the 60 trim flows more.

T3/TO4E 60 Trim, .82 A/R < ------- Click Me

Post by **DammitBobby** » Sun Jan 14, 2007 9:35 am

525HP!! Yea but that may be to big for me. Nobody on this board that I know of is running that combination. Would be nice to look at a dyno run and have some input on that one you picked out.

Here is my problem tomorrow morning unless something comes up I am headed to Buhl AL to upgrade the turbo. So I really need to make my decision today. Right now the proven size is 50 Trim .63 A/R StageIII wheel. I guess I will leave the compressor side .60 A/R alone since nobody has even mention anything about the compressor side.

With 8.8 to 1 compression Achieving the highest HP on 93 pump seems to be around 350 rwhp on this size turbo at 15psi.

In the future I really want to install Meth/water injection and crank boost up to 20psi or whatever level is safe.

Post by **NateDogg** » Sun Jan 14, 2007 1:36 pm

Why dont you save yourself $500 and just upgrade the turbine housing to .63 A/R???

Post by **DammitBobby** » Mon Jan 15, 2007 9:13 am

Oh it is not going to cost me 500 bucks I will be paying alot less then that. I had to go into work today as I was getting ready to leave:( Oh well maybe one day this week or next I will get it upgraded. That will give me a few more days to consider any other options.

Post by **C-Kwik** » Mon Jan 15, 2007 2:07 pm

WDRacing wrote:Here's the turbo and the info. This will come with a tad more lag, but nothing close to a full T4. But it will definitly free up exhaust flow in the upper ranges and the 60 trim flows more.

T3/TO4E 60 Trim, .82 A/R < ------- Click Me

The 60 trim may have a higher flow rating, but it may not happen on the KA. At least not optimally. Max turbo flow is measured on a compressor map at the point furthest right. The probem is it occurs at a particular pressure ratio (boost). So unless the motor can ingest that much air at the given pressure ratio, it won't see that kind of efficiency (which is as low as the turbo company will deem acceptable). With most T4's, the KA will have a hard time reaching the right edge of the map at any boost level without a significant bump in redline. The best way to make high HP is to size the turbo so that your reaching peak HP somewhere in or near a high efficiency operation area of the turbo. High efficiency areas will also flow more air for the given boost level and engine RPM.

Post by **WDRacing** » Mon Jan 15, 2007 4:27 pm

He wanted info on the .82 AR, I simply gave it to him. I think Bobby is a retard for changing his current setup at all.

WD

Post by **DammitBobby** » Mon Jan 15, 2007 5:26 pm

Post by **WDRacing** » Mon Jan 15, 2007 6:20 pm

Nothing but Love bro...you know that!!!

Post by **NateDogg** » Mon Jan 15, 2007 7:09 pm

I second the idiot badge for not simply upgrading the turbine.

What is your reasoning?

Post by **DammitBobby** » Tue Jan 16, 2007 2:13 am

That is what I plan on doing but I will change the trim to 50 while I am at it. I think it is 57 trim now. I just wanted to know what the exact components I need to reach my goals so I won`t have to keep going back and make more changes.

Post by **DammitBobby** » Tue Jan 16, 2007 2:16 am

Yep I know

Post by **WDRacing** » Tue Jan 16, 2007 5:17 am

If 350 is all you're going for Bob, the current turbo should be fine. Give her a go first, just crank the boost up. Also, seriously look into alcohol injection for the track. Its so cheap nowadays its not very smart to not have it. If you hit me up via email, [email protected] I have a brand new SMC Kit I'm unloading for CHEAP, about 170 under what I paid for it a few years ago. I'm going to put it in the BST forum, but I'll give you a wack at it first.

Another thing, the 57 trim actually flows more top end then the 50. Although the 50 is slightly more efficient for a larger percentage of the compressor map. But not enough to warrant a change. How much boost are you running?

WD

Post by **C-Kwik** » Wed Jan 17, 2007 3:21 pm

WDRacing wrote:He wanted info on the .82 AR, I simply gave it to him. I think Bobby is a retard for changing his current setup at all.

WD

I'm just clarifying as usual.

Post by **nissanfanatic** » Wed Jan 17, 2007 4:32 pm

.82ar is going to put full boost at around 4500rpm... Its a great housing for top end stuff(roll racing, drag racing, even street car).. That is, if you want spool that late...

Post by **WDRacing** » Wed Jan 17, 2007 6:08 pm

No Chano, you were just being you...LOL.

Post by **DammitBobby** » Thu Jan 18, 2007 4:05 am

I figured the .48 A/R would net 350rwhp but I want something that isn`t maxed at that level. Right now I am running 15psi and with this colder weather I have seen it go up to 17psi. I have logged several pulls with Zeitronix Data logger that shows TPS, RPM, AFR and Boost level. So I know exactly what RPM level I am running boost at.

I figured if I had to replace the T3 gasket and fix the downpipe I might as well change the turbo components while I am at it.

Also thinking of using some of that copper gasket spray on the T3 gasket and I don`t have a gasket for my downpipe to turbo. I am wondering if I should get some stove gasket sealer to see if it helps any.

Post by **WDRacing** » Thu Jan 18, 2007 6:59 am

I never ran a gasket between the turbo and DP on any of my cars. If you want a good seal your best bet is to use a V-Band clamp.

You need to get your *** to a dyno, crank the boost to 20psi and roll. Quit being a ***** and buy an alcohol injection kit.

Which I just so happen to be selling. Brand new SMC single stg kit if you're interested. You get a friends rate...shoot me an email if interested. [email protected] but either way, crank up the boost and hit the dyno. You never know whats what until you actually max things out. Then we'll actually know what that turbo is good for.

WD

Post by **NateDogg** » Thu Jan 18, 2007 11:44 am

I've used muffler cement as a gasket with good success. Just make sure you let it cure before you fire up the engine.

Post by **DammitBobby** » Thu Jan 18, 2007 4:33 pm

Hmm never thought about using muffler cement.

Need Help with Turbo component selection

Need Help with Turbo component selection

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