Early Callaway Twin Turbo Maintenance and Performance checkl

Discussion of Corvette based Callaway Cars including: (B2K) Callaway Twin Turbo Corvettes (C4); Callaway SuperNatural Corvettes (CL-1/CR-1); Callaway C12; Supercharged Corvettes; Callaway C16; 6th Generation Callaway Corvettes (SC560, SC580, SC606, SC616, SC620, SC652); and 7th Generation Callaway Corvettes (SC627/SC757) - and more!
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4 turbos
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Re: Early Callaway Twin Turbo Maintenance and Performance ch

Post by 4 turbos » Thu Aug 07, 2014 8:06 pm

Thanks Frank for the info/when I get back to San Antonio/currently in Washington at the summer home/I intend to get # 508 running and on the road/did the 91 cars have the big wonderbar? Good to go with the late trans/hope I can get it to run with my zr1,or even the Fidanza car :jsmile

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SurfnSun
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Re: Early Callaway Twin Turbo Maintenance and Performance ch

Post by SurfnSun » Fri Aug 08, 2014 1:12 am

91 cars already have a large Wonderbar...no upgrade needed.

boostedmaxPSI
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Re: Early Callaway Twin Turbo Maintenance and Performance ch

Post by boostedmaxPSI » Mon Aug 11, 2014 2:32 pm

4 turbos wrote:Thanks Frank for the info/when I get back to San Antonio/currently in Washington at the summer home/I intend to get # 508 running and on the road/did the 91 cars have the big wonderbar? Good to go with the late trans/hope I can get it to run with my zr1,or even the Fidanza car :jsmile
Looking forward to it. Need to wind that 415CID up against the B2K and stretch the legs on 508.

boostedmaxPSI
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Re: Early Callaway Twin Turbo Maintenance and Performance ch

Post by boostedmaxPSI » Mon Aug 11, 2014 2:36 pm

SurfnSun wrote:91 cars already have a large Wonderbar...no upgrade needed.

Josh, was the only reason for the bump in HP from 382Hp on the '88-'90 cars to 403hp on the '91 cars?

boostedmaxPSI
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Re: Early Callaway Twin Turbo Maintenance and Performance ch

Post by boostedmaxPSI » Mon Aug 11, 2014 2:47 pm

O Rings and Seals- In the Ram Horn there are three areas of potential vacuum leaks. The two AUX Injectors have an O ring and the main O ring on the inside of the Ram Horn that seals around the throttle body. While I have not had any issues that I am aware of on the AUX Inj., there is a forum member that did identify this as an issue on his car. Callaway Cars still offers replacement seals. This would be an ideal, one time replacement item during your ownership and it's on my list to do as well.

I have replaced the main O ring that seals to the throttle body. This O ring will flatten over time on the side that meets the throttle body not allowing for a proper seal. This will become apparent when you remove the Ram Horn for various reasons to get deeper in the motor. EGR replacement, Injector replacement, Upper and Lower gasket replacements, Valve Seal replacement...

I remedied this by going to ACE hardware and getting a single O ring material that can be cut and sealed to size. This is how Callaway Cars did it as well. Meaning the O ring is not an actual "O" ring. It's O ring material that is cut to length and the two ends are sealed together with O ring sealer. Very simple fix.

For MAF cars, this could cause an issue with getting unmetered air upstream of the MAF.

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SurfnSun
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Re: Early Callaway Twin Turbo Maintenance and Performance ch

Post by SurfnSun » Mon Aug 11, 2014 9:46 pm

boostedmaxPSI wrote:
SurfnSun wrote:91 cars already have a large Wonderbar...no upgrade needed.

Josh, was the only reason for the bump in HP from 382Hp on the '88-'90 cars to 403hp on the '91 cars?

Yes, to the best of my memory. Some places the 90 was called 390hp vs 382, but I'm not sure those were official ratings. The change from MAF to SD, could be cause for the change, but the wonderbar is really where the power is apart from boost and exhaust upgrades.

boostedmaxPSI
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Re: Early Callaway Twin Turbo Maintenance and Performance ch

Post by boostedmaxPSI » Fri Nov 21, 2014 2:39 pm

Tools - I always carry a paper clip to ground the information pin in the ALDL connector in addition to a printed code sheet... just in case you get a dreaded Check Engine light while on a road trip.

sweet88
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Re: Early Callaway Twin Turbo Maintenance and Performance checkl

Post by sweet88 » Wed Jul 26, 2017 8:31 pm

I have a 1988 callaway covette convt. this car was given an update specs to a 1991, what does that mean

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SurfnSun
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Re: Early Callaway Twin Turbo Maintenance and Performance checkl

Post by SurfnSun » Wed Jul 26, 2017 8:59 pm

That means you got a turbo upgrade to rotomasters. Not sure if the Wonderbar was part of that but a photo of your front frame rail would confirm quickly.

Brian B
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Re: Early Callaway Twin Turbo Maintenance and Performance checkl

Post by Brian B » Sat Sep 02, 2017 9:30 am

Thanks for all the info here guys! I have an opportunity to purchase a '90 twin turbo aerobody with 31,000 miles and I'm obviously concerned about Callaway specific issues to deal with. Amy other suggestions would be greatly appreciated!!!

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