set up
9:5 piston forge rods
acl bearings
skunk 2 manifold
68mm t.body
full race ram horn manifold
precision bb 6262 with a ar .62 back housing .80
3" downpipe
780cc precision injectors
40mm waste gate

stock head

meth injection.

i had a cheap ebay turbo set up b4 with a small t3t4 turbo.i was spooling full boost 16psi around 4500 rpm maxing my 550cc injectors..
now i have upgraded to my new turbo set up my 6262 builds only 9psi at 6500 rpm and finishes my 780cc injectors @ the same rpm..

i no something is wrong...

the same piping was used and was untouched b4 and after the upgrade....
i can clearly hear the turbo begin spooling at 3000 rpm but it buildds boost very slow
i have seen other 6262 turbos on b18c and they spool alot faster than this.. some spools 17psi at 5500 rpm.. at those are nun bb

am thinking am having a leak too but what the hell is uo with the fuel..

plz help

 

check for boost leaks.

 

^^^ agreed. Also, remember, the Precision 6262 is much larger than what you were used to with your ebay 50 trim. the larger that the wheel is for the same size displacement engine, the more air you're going to move. However, the drawback is that it takes more of that energy to move more of that air. the efficiency of the turbo isn't reached until a much higher RPM than your other ebay turbocharger. you went from 47lbs/min to over 67lbs/min (give or take). There's going to be a some "slower spool". That's something you'll have to live with if you want the higher power that you're looking for.

I wasn't just trying to point out the "obvious", but just a reminder that the two turbos are completely different from one another. Hopefully you weren't misinformed that because it was a billet wheel that it would respond the same way as your smaller turbocharger.

 

ok..slower spool isnt a problem am willing to give up some low end and spool time ..in thinking about it i dont think theres a boost leak or else my wg wounldnt open at 9psi and hold it

but dam thats a long way to spool..lol..

am planning to run 15-16 psi if i get it by 5500 rpm am gonna b happy cause am only reving 8200rpm
...

 

exhaust housings contribute to slower spool as well.

 

I dont know much about turbos, but cant you get it to spool quicker if you build the head?

 

maybe a little if you port it you might see a difference. also if you build it to rev higher, you have that much more rpm to use for the turbo.

 

True, but that is a small part of the equation compared to the rest of the system that entails the PRecision 6262 turbocharger. The efficiency of the airflow of the turbo is based upon the exhaust and compressor wheel combination more than anything else. Since this combination is capable of over 680 +whp, as opposed to perhaps 450whp from a completely different wheel combination, he can port, and hone, and change housing all he wants. It will not respond in the same way as what he has because the 6262 was made for a completely different purpose than his old 50 trim.

The OP has to face the fact that he has purchased a turbo, as great as it is, for possibly the wrong reason without researching all of the options that are available for his needs. He may have not understood the other characteristics and capabilities that the 6262 possesses and compared those characteristics to what his expectations were.

Perhaps he just asked the wrong questions or focused on power only and not the other things. The 5857, 6062, or a dozen others from the Precision line may have done the job for him without the "slow spool" he's currently pissed off about.

He got a BIG turbo.. what was to be expected?

 

i like your answer..you are very straight forward.lol. am just surprised ,,i honestly thought by buying a ball bearing turbo would have saved me from the long spool time..after all some guys here was using a similar set up and hitting 17psi by 5500 but i guess thats because i still have in my stock cams

but pissed??NEVER i have seen what big turbos do in the end and i didnt want to buy a smaller turbo then buy a bigger one when i got tired....

my engine build is almost complete ..after head work revving to 10k wouldnt be a issue and even if the turbo spools full at 6000 i would still have up until 10000 to enjoy.

I MAY NOT BE PLEASED NOW BUT AM SURE I WILL BE IN THE END

 

Lag is going to be a problem. A high reving engine will help keep you in boost

 

my point exactly.

and yes i know the housing is only part of the equation, but it does make a difference. a lot of things contribute to it. even gas. i noticed spool time going from pump to e85. something you might want to think about too.

 

Do a pressure test on your charge piping, then youl know

 

check and make sure your downpipe is connected properly. I had a gasket leak on my old set up and I was experiencing slow spool.

Also had the same thing happen to me with a leak in one of my Cupplers.

Nothing was audiable at all, but I just knew something was wrong. It pays to just tripple check everything. I went from making 8psi at 6000 RPM. to making a good 15psi at roughly 5600rpm.

 

that reminds me. my ramhorn cracked on runner number 3. made it spool later as well. check to see if its cracked or something.

 

you said you had a t3/t4 turbo. Does your 6262 have a t3 or t4 turbine housing?. I would also check the turbo manifold gasket where the turbo meets the manifold.