TSLAVette

Have LT1, A8, BMS filter and Magnuson Heartbeat with stock 95mm pulley for warranty purposes.

Reading about 95 and 103mm TBs vs stock 87mm.

Currently 552whp and 562tq on Mustang in floor dyno.

What can one expect with the 95mm? Worthwhile or no?

pj-c7

Subs...I have similar setup so will be curious as well...

Pj

robert miller

By about any kind of set up in a motor build unless you are 100% all out race car you don't need no more than the 95 TB on a motor. Some of the 103 WILL GIVE A TUNER HELL ON GETTING IT TO WORK GOOD AROUND TOWN.. From I I have been reading in here the 95 from the zr1 is the way to go & runs out great on the car with no problems at all...I went with the 95 zr1 on my new build... Robert

Earl H

Question is indeed application specific:
- For PD blowers and assuming max power is the goal, bigger TB is better. As Robert's comment references, assuming tuner can get it right.
- For blow thru, like centri SC or turbo...stock LT4 TB has proven plenty capable...my car made 1250+whp with time slips to backup most of the numbers. New combo, 388 and bigger turbo will again use the stock TB. I've seen multiple centri cars make 1300+ on stock tb.

robert miller

I agree 100% more so on what you are saying with a turbo set up. But OP here if you are running to get a number I wouldn't go no more than the 95 tb on any set up that the car will be used for a street machine also. I am saying the 95 tb due to the few more HP that ever one is saying they are seeing with it...If I had it to due over I would have done turbo due just to the fueling & this.. Robert

TSLAVette

Thanks, fellas. I presume my tune would need a ‘refresh’ with the 95? Also, where did you find yours? Will any intake tubing need replacement going from stock 87 to 95?

robert miller

got mine from Cajun a vendor in here yes you will need a plate but every one that sales these the plate comes with it...

Cajun @ edgevette vendor in here... Robert

BlueDevilZ51

I went from the stock 87mm tb on my stage 2 Edelbrock E force to the new 95mm tb. With the 87mm tb my car made 9psi. With the 95mm tb it went to 10 psi. You will definitely need a tune adjustment or run higher octane. I picked up consistant 2* KR after the switch. Im now using Boostane 100/102 octane and it cleaned up the KR.if i want to go back to 93 octane ill reinstall the 87mm Tb.

robert miller

That is wild man GOOD to know this I run 93 octane all the time & here in town I can get 93 with none of the bad crap in it also. If I go to the track I also use the boostane only for the track.. Robert

BlueDevilZ51

From what ive read a PD blower benefits more from the larger TB then a centrifuge would.

TSLAVette

How would a 95mm TB stack up to a Soler Eng 87mm.?

robert miller

I cant make a remark on this one, BUT FOR SURE I know you can play with these T.B. and make them feel like you have made 20 r 30 more HP this is only by the feel of the car on how it is pulling out on you. I would really want to see the true RWHP gains from it.

If you look at the tuner in here are the vendor that goes by COW TUNING he does a lot of playing with that part of the car in the tuning of it that makes the car feel better of the line stuff.. Robert

TSLAVette

Thanks, Robert. Not interested in playing with the drive by wire stuff, I want more air in to mix with more fuel.

C5-VERT

Wish I could have done a before/after with my 103 Katech TB. I have an F1A-94 setup. Course I think the problem is always centered around charge pipe sizing + intercooler flow rates. The hot side of my Race intercooler is 3" and cold side is 3" that makes no sense to me. I am TIG welding a larger 4" cold side out moving my MAF up closer with a honeycomb air straightener before it. So instead of my 3" cold side charge pipe stepping up to 4" right before my TB (which honestly won't probably make much difference), my entire cold side out the intercooler will be 4" all the way to my TB, which I KNOW will make a difference. How much, no idea...

Mike@SolerEngr

Stock 95 mm, has 9.6% more flow area.
Soler 87 mm Modified, has 15% better flow coefficient.
We'd like to think we'll win it by 5% at WOT and by a larger margin at lower angles.

Search using the following keywords "flow through orifices", "discharge coefficient", "flow coefficient" and see how a smaller orifice can flow more than a larger one depending on how you shape the inlet/outlet.

Earl H

Stock TB (Centri Blower):


https://www.corvetteforum.com/forums...-a-c7-z06.html



PD Blower, different matter...

C5-VERT

Earl, you're my buddy you know that but has anyone done some before/after yet (with true 4" or 102mm piping right off the intercooler COLD side to a smaller 87mm stock TB then to a direct match 103mm TB)? What I mostly see is the problem is most use 3" piping or 3.5" which isn't 103mm (4"). So if you have smaller piping then right before the TB up that via a reducer 3-4" what's the point? It's still 3" from the intercooler to right before the TB, which is restricting flow. I personally can't see how taking it 4" directly from the intercooler COLD side meaning a true 4" 102mm piping all the way to the TB it won't flow more air/volume??? Why just being a centri would it not matter? That' would be a choke point if you went from 4" out the intercooler DOWN to 87mm or 3.5". I think the problem here is most all Procharger piping is 3" (charge pipe on the cold/hot side) which is the main restriction, not the TB. So having charge pipes at 3" and then a stock TB at 3.5" then jumping to a TB of 4" sure I am with ya I doubt it does matter or even worth it.

LOL I sure talk like I know what I am saying

And yes I am more referring to BIG centris here not smaller setups. It would not be worth it on smaller setups or maybe street machines I agree. I have seen some HUGE piping on some F2/3 Prochargers on some Drag cars with ginormous TB's!!! At it's heart an engine is nothing but an air pump if you meet the air coming in with the right CAM/Heads/Intake/Headers + compression ratio (meaning able to handle the volume of air efficiently) why wouldn't a larger setup help on big centris/boost?

One thing I will say is Chris Crawford sure found a way to tune mine to idle like a swiss watch! I thought the 103mm TB was going to have some idle issues you hear about that a lot but it sits at 600rpm all day long.

Lastly, I am just super jealous Earl you have a mid-8-second badass car using that stock TB and here I am with a $600 103mm making less power haha . Pass some of that HP this way!!!

Zan Dad

What if you offered a modified 95 mm?

Mike@SolerEngr

Working on it, unfortunately at a much slower pace than we'd like. We have had a fair amount of success w/ the LT1/LT4's and production is consuming all of our time. But we'll get to the LT5 eventually. Stay tuned.

Zan Dad

I bet, congrats on all your early successes. I’m sure when it’s ready it’ll be a great product.