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Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: playerpage ()
Date: October 29, 2019 08:59AM

Can someone give me a good guideline on what is a common/preferred driving and acceleration on the Corsa Turbo? I know theoretically that my car loves high RPMs, but I'm still furtively glancing at the Tach as I drive, and I rarely let it go past 4000 in any gear. When is it getting crazy? Is the 5-6000 mark on the Tach a correct range of use/danger? Or should it go slower and how often can it go faster?

Cheers.

____________________________________________

Eric C. Player, Porterville, CA
Member: CORSA National, Central Coast CORSA, South Coast CORSA, and San Joaquin Valley Corvair Club
THEN: 1965 Monza 110 Canary Yellow
1967 Monza 140 Red
1966 500 110, Black; nicknamed "Shadow"
1965 Monza 110, Camaro Yellow; nicknamed "Silver"
NOW: 1966 Corsa 180 Turbo; nicknamed "Bluvair"

"It would not have helped if I had [taken notes], as he would start a paragraph with, 'It is therefore obvious. . .'
and go on from there to matters which may have been obvious to him and God but to no one else."
-- Robert A. Heinlein, character of Daniel B. Davis, 'The Door Into Summer.'

------

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: Spyderman64 ()
Date: October 29, 2019 09:24AM

As long as the engine is basically sound, revving it up won't hurt it. I yellow-lined my turbo cars lots of times with no ill effect. An occasional blowing out the carbon actually seemed to make them run better afterwards.

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: playerpage ()
Date: October 29, 2019 09:53AM

Thanks! Now all I have to do is fix that shifting issue--which is still a mystery.

____________________________________________

Eric C. Player, Porterville, CA
Member: CORSA National, Central Coast CORSA, South Coast CORSA, and San Joaquin Valley Corvair Club
THEN: 1965 Monza 110 Canary Yellow
1967 Monza 140 Red
1966 500 110, Black; nicknamed "Shadow"
1965 Monza 110, Camaro Yellow; nicknamed "Silver"
NOW: 1966 Corsa 180 Turbo; nicknamed "Bluvair"

"It would not have helped if I had [taken notes], as he would start a paragraph with, 'It is therefore obvious. . .'
and go on from there to matters which may have been obvious to him and God but to no one else."
-- Robert A. Heinlein, character of Daniel B. Davis, 'The Door Into Summer.'

------

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: jjohnsonjo ()
Date: October 29, 2019 01:18PM

I've run mine well over 4K for hours at a time.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: flat_six ()
Date: October 29, 2019 02:31PM

The red line on a Corsa tach was determined by the 140 engine and valve bounce at high revs. The turbo engine, assuming a stock 302 cam can safely be revved higher. That said, I don't go over 5500 rpm for multiple reasons, not the least of which is that you don't get much/any more HP above that due to the restrictions built into the YH carb.

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: jjohnsonjo ()
Date: October 29, 2019 02:41PM

flat_six Wrote:
-------------------------------------------------------
> The red line on a Corsa tach was determined by the 140 engine and valve bounce at high revs. The turbo engine, assuming a stock 302 cam can safely be revved higher. That said, I don't go over 5500 rpm for multiple reasons, not the least of which is that you don't get much/any more HP above that due to the restrictions built into the YH carb.



I think you meant 304, but what's 2 more among friends.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: flat_six ()
Date: October 29, 2019 02:44PM

jjohnsonjo Wrote:
-------------------------------------------------------
> flat_six Wrote:
> -------------------------------------------------------
> > The red line on a Corsa tach was determined by the 140 engine and valve bounce at high revs. The turbo engine, assuming a stock 302 cam can safely be revved higher. That said, I don't go over 5500 rpm for multiple reasons, not the least of which is that you don't get much/any more HP above that due to the restrictions built into the YH carb.
>
>
>
> I think you meant 304, but what's 2 more among friends.

thumbs up Thanks for bailing me out lol. Perhaps had a certain SB Ford on the subconscious.

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: kmart356 ()
Date: October 29, 2019 02:45PM

Revs will get you into the boost, but not much unless you go past 4000 and push up to 5000rpm or 5500rpm. Take a look at the HP vs RPM curves along with timing. Based on stomping gas pedal at 2500rpm to start developing boost, the engine will lose timing (when retard kicks in) until well after 4000rpm.

and as Spyderman64 says... blowing out the carbon will help power. thumbs up



Ken
'62 Spyder Coupe
Florida


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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: jjohnsonjo ()
Date: October 29, 2019 02:47PM

flat_six Wrote:
-------------------------------------------------------
> jjohnsonjo Wrote:
> -------------------------------------------------------
> > flat_six Wrote:
> > -------------------------------------------------------
>
>
> thumbs up Thanks for bailing me out lol. Perhaps had a certain SB Ford on the subconscious.


HEH LOL I thought you had Z28 on the brain, never thought of Fords.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: joelsplace ()
Date: October 29, 2019 02:50PM

No call to use obscene language on the phorum. 302 is Chevy.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: larry202br ()
Date: October 30, 2019 05:20AM

kmart356 Wrote:
-------------------------------------------------------
> Revs will get you into the boost, but not much unless you go past 4000 and push up to 5000rpm or 5500rpm. Take a look at the HP vs RPM curves along with timing. Based on stomping gas pedal at 2500rpm to start developing boost, the engine will lose timing (when retard kicks in) until well after 4000rpm.
>
> and as Spyderman64 says... blowing out the carbon will help power. thumbs up
>
>


I guess I've been missing out, I've never rev'd over about 4500 RPM! It might be next spring before I can get it out again to test though.

1961 rampside with a 65 / 67 110 engine, car four speed.
1965 convertible
1966 Custom two door/four door 180 Turbo.

KC0SKX
Olathe, ks
HACOA

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: JimBrandberg ()
Date: October 30, 2019 05:49AM

She's probably only starting to come alive at 4000. Is it making any boost?

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: larry202br ()
Date: October 30, 2019 05:57AM

JimBrandberg Wrote:
-------------------------------------------------------
> She's probably only starting to come alive at 4000. Is it making any boost?

Yep, I can see it on gauge, and feel it in the seat of my pants. I guess I'm still a little trepidatious when it comes to the turbo. The more I drive it, the braver I get.

From the charts above, it looks like 4500 is right in the middle of the peak boost.

1961 rampside with a 65 / 67 110 engine, car four speed.
1965 convertible
1966 Custom two door/four door 180 Turbo.

KC0SKX
Olathe, ks
HACOA

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: viewmaster ()
Date: October 30, 2019 07:22AM

Eric,
Does any of this help you??? LOL

-m

Mike
'65 '500' Sedan 110 PG
'65 Monza Sedan turbo'd 110 SU conversion
Fresno, CA

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: playerpage ()
Date: October 30, 2019 09:57AM

This helps a lot. I don't mind having my thread hijacked. Lots of good information. Thanks all!

As for me, I've never been able to really tell if I'm getting boost because I'm not really sure what the Boost would feel like. I do admit that after 4,000 RPMs the car starts to feel like it's pushing me rather than me pushing the car. That's probably the turbo right?

My only frame of reference besides the turbo that I had in high school (which was really my dad's and so I only drove it on special occasions and extremely slowly), is the Chrysler Laser he had when I was about 10. It was a turbo and when he would engage it I could really feel the car start to push. I also saw the gauge leap. I verified that I have suction on the line, but my gauge has never worked in this car.

____________________________________________

Eric C. Player, Porterville, CA
Member: CORSA National, Central Coast CORSA, South Coast CORSA, and San Joaquin Valley Corvair Club
THEN: 1965 Monza 110 Canary Yellow
1967 Monza 140 Red
1966 500 110, Black; nicknamed "Shadow"
1965 Monza 110, Camaro Yellow; nicknamed "Silver"
NOW: 1966 Corsa 180 Turbo; nicknamed "Bluvair"

"It would not have helped if I had [taken notes], as he would start a paragraph with, 'It is therefore obvious. . .'
and go on from there to matters which may have been obvious to him and God but to no one else."
-- Robert A. Heinlein, character of Daniel B. Davis, 'The Door Into Summer.'

------

Options: ReplyQuote
Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: jjohnsonjo ()
Date: October 30, 2019 10:21AM

If your on an interstate and doing about 55 to 60 put it in 3rd floor it and keep it there until yellow line. If it doesn't feel like a passenger during takeoff, its not working right.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: Curtis ()
Date: October 30, 2019 10:28AM

smiling smiley


[www.youtube.com]

Curtis

64 Spyder Convertible
Milwaukee, Wi

Former Corvairs
62 Monza 900 Coupe (102/4)
64 Monza 900 Covertible (110/PG)
65 Monza Coupe (110/PG)
66 Monza Coupe (110/PG)
66 Monza Sedan (110/PG)

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: flat_six ()
Date: October 30, 2019 11:05AM

viewmaster Wrote:
-------------------------------------------------------
> Eric,
> Does any of this help you??? LOL
>
> -m

Good point. I'll try to summarize and stay away from the modifications discussion:

The Corvair turbo needs airflow to make power. So even when starting up from a stop in normal traffic, I almost always put the pedal to the floor or way down at first then back off to shift, even if I'm "only" shifting at 3000-4000 rpm. You will find this allow you to keep up with everyone else lol.

If you really want the fly, put the pedal to the floor and shift at 5000-5500 rpm. That will give you the best acceleration times.

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: flat_six ()
Date: October 30, 2019 11:07AM

playerpage Wrote:
-------------------------------------------------------

I do admit that after 4,000 RPMs the car starts to feel like it's pushing me rather than me pushing the car. That's probably the turbo right?
>

Turbo is on boost then but also the centrifugal advance comes in quickly at around 4K rpm. It's quite sudden.

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Re: Low/Cruise/Dangerous RPMs on a Turbo?
Posted by: MattNall ()
Date: October 30, 2019 11:10AM

Never run any Vair engine below 2200-2400 rpm in any gear / load..

If I had to wait for 4th gear and 3500+ rpm for boost... I wouldn't own a TurboVair..


Once again my '66 getting no more than 7 psi boost... capable if 14....

Pay ATTENTION and LISTEN... you can HEAR the boost come on and will notice the car accelerates past the trees faster! I seldom go over 4,000 rpm.

[youtu.be]

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo




Edited 1 time(s). Last edit at 10/30/2019 11:47AM by MattNall.

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