is the gt35r worth the extra money over gt35? will it spool up faster and if so how much? thinking about changing te44 on the ptk kit that hasnt been shipped yet. i was told that the r series will spool approx. 500 800 rpms earlier! if thats true i'd imagine its worth it.
i heard the gt series are a marked improvemnt over the te model, is this true?

help me out here

 

 

I would wait to see what Kevin's results are.

Mark

 

from what i have read the gt30r and gt35r are superior to all others. spool faster and smoother. another $1000 for the both of them over te44

 

Does this help?

 

no, i wish i could read that but sorry

 

Depends...

Would you rather have driveline breakage @ 2500rpm or 3000rpm?

 

thanks

 

If you are looking to put a pair of turbo's that size on a LS1 then get the dual BB. Reap the benefits every time you push the gas. I'd do them in .63 GT turbine housings. Don't put GT turbos in 5-bolt housings, they don't like it.

Kevin

 

spoke w/jose@forcedinductions and greg@ptk they discussed with presision turbo and will go with pt51 hybrid.

 

Those are way smaller than GT35R's. Whatever.

 

I too am going with the PT51s. I would use the GT35Rs if I had a 427cid..but not with a 346cid. If I had the extra cash I would buy the GT30Rs BB and slap them on. The PT51's are the next set of Turbos we are going to try..a little smaller wheel and keeping the same AR. The PT51s are similar to a 60-1 in size.....Jpas got pretty good results with the 60-1s on 91 octane.

 

PT51 = T04E 60trim =52lb/min wheel
60-1 =60lb/min wheel
GT35R =65lb/min wheel

A pair of 60trims will work fine. Has 900+whp potential if you want to crank the boost to 30psi. But they aren't even in the same class as GT35R's. 35r's would spool just as quick but would make 1100+ at 30psi. It's all just tire smoke anyway. I would never do GT30R's on any V8, turbine wheel is too small IMO.

Kevin

 

Its hard to really place a jurnal bearing turbo in the same class as a double BB turbo (regarding spool time..bb is going to be quickier). It looks like you have some experience with sizing Turbos. How many C5s (346cid) have you driven with GT30Rs on them? LPE uses the GT35 with their 427cid and a smaller one with their 346cid....I respect LPE as an authority in this area, but if you have some different experiences TT C5 related...I am all

I have only driven one GT30R powered Z06 (346cid) and it was or seemed perfect, it was very smooth on the street and pulled like a ****, made great power on 9lbs of boost. Unfortunately he forgot to hook up the wastegates vacuum lines...and at 30lbs of boost (according to the indicator) blew the rings right out of the motor..I have never seen an lsx so blown up. At A&A's grand opening I was looking at the kit/car, and actually pulled a piston ring out of the engine bay (near the starter) and showed it to a bunch of people...I have never seen a ring blown all the way out...just broken ringlands and a couple of bent rods (stock).

Kevin

PS
The PT-51 is an off the shelf turbo from Precision with all Garrett internals. Have you seen this turbo used on any other cars?

Something to keep in mind too...with a V8 (346cid) and twins..you really have (2) 4 cylinders..so its approximately 173cid powering each turbo...maybe that is why a GT30R is a great choice for use in a twin application....or a PT51 for that matter.

 

i guess we will find out if the pt51 work or not

 

I think we're going to use a pair of GT35R's with my HP performance turbo kit on my 370 cu in built motor. We'll see shortly how they do. Dave

 

I've only turbo'd a few V8's myself but have sized and served tech support for 30-40. We just sent a couple special turbos off to Harlan for the upcoming season. The more I learn, I’m constantly going with larger and larger turbine wheels. Most my experience is in 4cly-6cly applications (well over 1000). In all those apps I have gauged what I feel is unacceptable backpressure ratio when using the GT30 turbine wheel at any real HP level. At lower power levels it's not a major issue, I think that's why Lingenfelter uses them. LPE is generally only looking for 300hp out of a 500hp turbo. From what I’ve seen when using a single GT30 on 2-3L motors, I would estimate a 5.7L would be running 2:1 backpressure maybe a touch more. I wouldn’t go that high on any of my cars but to get the instant response that MotorTrend critics what to see, you do what you do.

I use the T04E 60trim (PT-51) all the time. This turbo from a sizing standpoint is much better suited for a 5.7-7L application do to the very large turbine wheel. Really the only down side of these would be the lag. That’s where a pair of 35R’s is going to pay off. Or just run one big turbo the way god intended it

Kevin

edit to add- I have seen the GT30R run over 3:1 at high boost. Man that sucks.

 

Now I know who C5Turbo is

Kevin owns AGP Turbo in AZ., and has gratiously helped us in supplying the new hair driers for the upcomming season.

AGP

He does have a fairly extensive background in the import world and is looking to broaden his horizons into the domestic market. I think he figures he can sell 2x the turbos per vehicle on V8s .


Phil

 

At the rate you guys are going your turbos will be a little bigger than whats on a TTi stage I. I remember when this thread came out you and Kevin were talking about twin T-66's. I am willing to bet some beers that Kevin Pyrtles TTi Stage I kit, with AFR heads and 9:1 compression will put out more than the PTK on PUMP GAS.

Anyone want to take me up on that?

 

Thats great to hear about the PT-51's. I didn't want to put up another $1000 for Turbos (GT35s)..I will leave that for future mods. When I drove Jim's car with the GT30's on it it had just made around 570/550 at the rears @9lbs. Jim had commented he wished he would have selected a larger AR (.81)..but after driving my TTi Stage III, Jim's setup felt so much better. It would have been interesting to see what those Turbos would have done on a 12-14lbs run. The overall kit had very low restrictions in the header and intake. Jim had told me at 9lbs he measured 1.5:1 backpressure in the header. I can't verify that, its just what he told me.

I don't remember stating TE66's, I remember TE64s...but maybe.

As far as the TTi Stage III kit is concerned, I made more power than anybody else I saw on pump gas...nobody posted a dyno graph but me. I was at around 525/530 at the rears..with supposedly 12lbs of boost, then I dropped the CR to where is now and made 510/525 at the rears (A&As dyno)..in which George (TTi) told me himself, anytime you lower the CR and get around the same hp figures by adding timing..you did good. So at 9lbs of boost my PTK has already surpassed those numbers...with 3 less lbs..it will be interesting to see what my kit does at 13-14lbs. I will have to use hi octane fuel for that run..joining the crowd I guess.

I hope that KP's TTi kit can at least duplicate my old TTi Stage III kit numbers, especially since the CR will be close to the same. Also if it was tuned at the same place and used on the same dyno on pump gas. It seems to me there was a dyno day at Xtreme, and I remember Bill telling me what KPs car did on Xtreme's dyno. Here's a hint it wasn't higher than what I got out of my TTi setup..but I still wish KP the best of luck with his setup.

As for drinking and betting on beers, sounds great..but I only drink around people I trust. Why don't we just wish KP a great outcome for the money he has spent.