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Search: Posts Made By: Pumba
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Forum: C6 Corvette ZR1 & Z06
04-25-2022, 11:20 AM
Replies: 167
Views: 27,878
Posted By Pumba

You do not need to recalibrate your speedometer. ...

You do not need to recalibrate your speedometer. If you have a manual trans you do not need to change it either.
Forum: Autocrossing & Roadracing
10-24-2020, 09:25 PM
Replies: 30
Views: 31,315
Posted By Pumba

My EXCEL ceramic boots are still working fine.

My EXCEL ceramic boots are still working fine.
Forum: C7 Tech/Performance
10-12-2020, 08:00 AM
Replies: 70
Views: 18,389
Posted By Pumba

Contact Jeremy at RPM Transmissions for all your...

Contact Jeremy at RPM Transmissions for all your Questions - (800) 406-1109
Forum: C7 Tech/Performance
09-05-2020, 09:19 AM
Replies: 70
Views: 18,389
Posted By Pumba

J, Please articulate you qualifications on...

J,
Please articulate you qualifications on making Engineering or Manufacturing judgements on early 21st century Italian gear making.
Forum: C5 Tech
07-30-2020, 08:32 AM
Replies: 46
Views: 12,292
Posted By Pumba

Georgies, The 1.75 inches was removed...

Georgies,
The 1.75 inches was removed from the rear end of the torque tube. After it was shortened, the rear bell-housing was welded back on. I don't remember the welding method.
Forum: C6 Corvette ZR1 & Z06
05-29-2020, 09:57 AM
Replies: 19
Views: 1,161
Posted By Pumba

So far, oil usage is significantly less than with...

So far, oil usage is significantly less than with the old 1.2mm - 2.0mm - 3.0mm ring package.
Forum: C6 Corvette ZR1 & Z06
05-28-2020, 08:38 PM
Replies: 19
Views: 1,161
Posted By Pumba

Mirek, That sure is a pretty engine. Whose...

Mirek,

That sure is a pretty engine. Whose intake and what carb is that? Westech corrects to STP, which was last used by the automotive industry in 1979. And, the power levels that STD dyno runs...
Forum: C6 Corvette ZR1 & Z06
05-28-2020, 08:16 AM
Replies: 19
Views: 1,161
Posted By Pumba

Mirek, Who did your dyno testing? What...

Mirek,

Who did your dyno testing? What brand of Chassis dyno do they use - Dyno Jet or Mustang? What Correction Factor did they use, STP or SAE?
Forum: C6 Corvette ZR1 & Z06
05-27-2020, 12:53 PM
Replies: 19
Views: 1,161
Posted By Pumba

Nick, To answer your questions, I started...

Nick,

To answer your questions, I started out trying to tell you all the things that changed on my engine - Mamo ported MSD intake manifold and a new ring package.

The camshaft stayed the same:...
Forum: C6 Corvette ZR1 & Z06
05-26-2020, 11:43 AM
Replies: 19
Views: 1,161
Posted By Pumba

Apocolipse, I believe part of the gain was the...

Apocolipse,
I believe part of the gain was the Mamo MSD and the other part was the new MAHLE 1.0mm - 1.0mm - 2.0mm rings. Regardless, 620 RWHP is fun to drive and much more than I thought we would...
Forum: C6 Corvette ZR1 & Z06
05-26-2020, 08:48 AM
Replies: 19
Views: 1,161
Posted By Pumba

New Pistons and Rings - Ported MSD Intake Manifold

Over the winter I had new MAHLE pistons and rings installed in my engine, and after three years of Tony Mamo's urging, I installed one of his ported MSD intake manifolds. All chassis dyno testing was...
Forum: C5 Tech
09-24-2019, 08:25 AM
Replies: 46
Views: 12,292
Posted By Pumba

The transmission itself did not need any...

The transmission itself did not need any modifications. In addition to the modifications I list in my post, the rear trans mounts needed modification.
Forum: C5 Tech
09-22-2019, 09:35 AM
Replies: 46
Views: 12,292
Posted By Pumba

No, I do not have comparison pictures. The ZR1...

No, I do not have comparison pictures. The ZR1 housing has substantially more reinforcement ribs on it than the Z06 housing has. I worked with RPM Transmission and they found a ZR1 housing for me.
Forum: C5 Tech
09-21-2019, 01:42 PM
Replies: 46
Views: 12,292
Posted By Pumba

Yes, the C6 Z06 diff would work. But, it is not...

Yes, the C6 Z06 diff would work. But, it is not as strong as the ZR1 diff. I don't know why the 7 speeds are less than the 6 speeds, but the 7 speed is a much better trans for Street-Track car.
Forum: C5 Tech
09-20-2019, 12:29 PM
Replies: 46
Views: 12,292
Posted By Pumba

George, My rear cradle is a C6 ZR1 piece and...

George,

My rear cradle is a C6 ZR1 piece and my rear differential is also from a C6 ZR1.
Forum: C5 Tech
06-19-2019, 09:24 AM
Replies: 7
Views: 2,508
Posted By Pumba

Ask early C7 Z06 owners if they believe GM...

Ask early C7 Z06 owners if they believe GM wouldn't sell a car with temperature problems.
Forum: C5 Tech
06-19-2019, 07:02 AM
Replies: 9
Views: 1,348
Posted By Pumba

I agree with the gentleman who suggested having a...

I agree with the gentleman who suggested having a 4.10:1 ring and pinion set installed in your car. Torque wise you will have a 19.9% increase in torque in every gear. Your sixth gear will be far...
Forum: C5 Tech
06-19-2019, 06:53 AM
Replies: 7
Views: 2,508
Posted By Pumba

Mike, Your temps are normal for a stock C5...

Mike,

Your temps are normal for a stock C5 Corvette. If you want to reduce the temps there are three things you should do: 1) Buy a DeWitts radiator and have it installed. 2) Buy a 160 degree...
Forum: C5 General
05-29-2019, 09:42 AM
Replies: 88
Views: 117,364
Posted By Pumba

https://cimg9.ibsrv.net/gimg/www.corvetteforum.com...

https://cimg9.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x534/picture_php_pictureid_165782_7c09be0cb4d1ebfc33198c0502e2f6e46da92012.jpg

Wheel Make: HRE

Wheel Model: 893R

Front Wheel...
Forum: Canadian Events
05-05-2019, 09:06 AM
Replies: 4
!
Views: 1,507
Posted By Pumba

!

What's wrong with John Caravaggio of Caravaggio Corvettes?

About one month ago, on a Friday, I called him and asked if he could make a replacement rear spoiler for my C5 Z6. John told me to call...
Forum: C7 Tech/Performance
03-24-2019, 02:13 PM
Replies: 70
Views: 18,389
Posted By Pumba

The Stingray uses a TR6070 trans with a 2.66:1...

The Stingray uses a TR6070 trans with a 2.66:1 first gear. The Grand Sport uses a TR6070, which in my opinion the worst gear set, which has a 2.97:1 first gear.
Forum: C7 Tech/Performance
02-22-2019, 08:37 AM
Replies: 274
Views: 68,258
Posted By Pumba

I just checked Summit Racing and Jeg's and...

I just checked Summit Racing and Jeg's and neither of them list a C7 differential gear set. Jeremy at RPM Transmissions has price information - (800) 406-1109, x 201.
Forum: C7 Tech/Performance
02-15-2019, 07:57 AM
Replies: 70
Views: 18,389
Posted By Pumba

With the M7 transmission you do not need to...

With the M7 transmission you do not need to recalibrate the speedometer.
Forum: C7 Tech/Performance
02-14-2019, 08:02 AM
Replies: 70
Views: 18,389
Posted By Pumba

Larry, These gear sets are recommended for...

Larry,

These gear sets are recommended for both street and competition use. They are stronger than the Linamar factory gears. They are manufactured in Italy, not in China or some other Asian...
Forum: C7 Tech/Performance
02-13-2019, 07:49 AM
Replies: 274
Views: 68,258
Posted By Pumba

Please contact Jeremy at RPM Transmissions -...

Please contact Jeremy at RPM Transmissions - (800) 406-1109, x 201 for pricing.
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