Anyone know the spooling characteristics of a non ball bearig 6765 on a streetport?

 

1 bar by ~4650 RPM logged by datalogit on a HKS manifold with 0.96 A/R hotside, 3" exhaust with plumbed wastegate, 3rd gear pull. (not my car)

thewird

 

i get 20lbs by 4500-4600 on a S5 with a SP

 

Oh yah, the car I mentioned is with the HPS cover.

rob81gsl, do you have a log of where its making boost or your just going by what you see on the gauge/rpm?

thewird

 

i have logged it on my microtech but dont have any screen shots of it though

setup is a streetported S5 engine with a vmount, billet 6765 journal bearings and .95 hot side.

on a side not i was trying to do a e85 swap and it seemed even more responsive

 

How big is your exhaust and open wastegate? 2mm or 3mm? Just trying to get an idea of the differences.

thewird

 

3" all way out back with no mufflers, 46mm precision wg open dump, aem boost controller, 2mm.

its a track car so i dont have to worry about those noise or emission issues

 

i am running a pte 6765 journal non billet and it makes full boost (20psi) by 4000. I have the .96 hot a/r with mild street port. between shifts it instantly builds boost i love it i would love to get the pte7476 and make a hybrid using the 74mm copressor wheel and the 65mm exhaust wheel in mine.

 

precision is way ahead of the game. with the billet its killler but if you look at its specs both compressor and exhaust are about the same on every one of there turbos. the To4z has a big exhaust wheel like 74 mm with a 66-67 mm compressor. the precision 67mm turbo has a 67 compressor and a 65 mm exhaust wheel so u get better spool.

 

well your comparing to ball bearing garrets try comparing with the ball bearing precision with these. pprecision blows these out of the water every time. you have borg warner trying to keep up with extended tip technology and soon all to be billet but again they also run bigger wheels so spool is slower

 

The wheel on a 65 turbine is the same size inducer and exducer as a TO4Z the only difference is the profile of the wheel itself.

~S~

 

Im trying to figure out how you get that size wheel to be at 20psi by 4000rpm...do you have any video of the car doing it's thing?

 

Guys, please don't talk wheel sizing unless you're 100% positive of the inducer/exducer sizes. Misinformation helps no one, and just makes the water muddy, if you get my drift

In this cold weather I see 20 psi just before 4000 rpm, this with the 500R (35R T4 hotside [68mm wheel] with 67mm/84mm comp wheel) and full 4 inch exhaust, moderately SP'ed engine. I'd be impressed if a turbo with an even larger turbine wheel (and presumably a smaller DP) showed even better response.

 

Also everyone please state the gear you are in when seeing XX boost at XXXX rpm. I can make 15psi on stock NS twins at like 3300 rpms going up hill in 5th Just trying to help keep things clear.

 

Make 22 psi by 3800 in 3rd gear with a 6765bb s cover .96 a/r

 

Maybe I have an exhaust leak or something, do any of you have a log in 3rd gear handy? What are your intercooler setups?

 

depends on what u have referred to. when i was turbo shopping for my car i was looking at the garret to4z turbo on Rx7store.net see the link below.
so now thats clear. And goodfella i agree with u but i hope this cleared things up on my part.

http://www.aptuning.net/Garrett_T04Z...rt-tbo-055.htm

 

Doesn't depend on what I've referred to, I have had them both in hand they both measure 74mm inducer and 65mm exducer. Not trying to sound snippy but you're comparing Precision's exducer with Garrett's inducer. The only difference is wheel profile.

~S~

 

what sean says is correct. you guys are comparing the wrong numbers from each manufacturer. from what i have read overall the 67/65 precision is basicly a p trim wheel with from by eye looks like a 35r turbine wheel design but larger, and a 67mm compressor wheel made of billet which makes the center hub smaller so the blades are 1.5mm larger then a normal cast 67mm, so it total has 3mm larger blade surface area, making it similar to a 70 or 71mm cast turbo. i will have mine shortly from sean at a-spec and will max it out.

 

Precision's line of HP turbine wheels are just Turbonetics F1 turbine line. The F1-62 (Precision's 62mm) , F1-65 (Precision's 65mm) and F1-68 (HP-Q) wheels. The 65 and 68 are simply taller then the Garrett variants of the P-Trim and Q-Trim.

 

Precision released their own divided turbine housings finally! I'm going to be ordering another 6765 with the HP cover and this divided housing in 1.00



thewird

 

f'n a! took 'em long enough, oh well, sean sourced me a divided 1.0 turbine manifold for my 6265.

 

Sweet. Needed that 4 months ago.

 

3 5/8" V band? Where might one find a matching flange for the down pipe?

 

They're probably measuring the OD of the actual flange. If it's like their undivided housings they have a 3" ID and the corresponding OD. Any 3" v-band mates to it.