Question about the twin turbos....

[JT ZR-Won]

I was wondering how difficult it is to tweak the turbos to push more power? I hear a lot about some of the import cars (Toyota Supras) tweaking the turbos and getting a lot more power out of them. Is this possible with the Callaway? If so, how much more power can you get?

Jay

 

[*89x2*]

Like any turbo car, the more boost=more power...
Callaway offers a "wonderbar" Air inlet ugrade for more flow to the turbo's and a lot of folks remove the cats (this will allow for more boost on it's own)
Fuel is key here, to match the +++Boost
There are folks that crank up their boost w/out regard to that and have paid the price... Others have spent $$$$$ Beefing up the parts known to be "weak links" and have strong running cars (A silver bullet comes to mind here - shooting flames and all )

W/ regards to some of the imports running crazy boost levels... I have seen many of those last less than a few passes on the track as a result of "Boost greed".

Callaway Twin turbo Corvettes boost is fairly addictive as is, w/ simple tweeks, it generally makes a good thing better but I would not do it at the expense of the car.
Hope all this helps - *89x2*

 

[SurfnSun]

There are two serious Callaway tuners on corvetteforum. Ultra Slow has about 490rwhp from his car with no major mods. there is another guy on there that is laying down 600rwhp. Both of those guys are really knowledgeable about the cars though.

 

[90Callaway]

Without spending too much money or swapping major parts you should be able to get 450+rwhp/600+rwtq reliably from a Callaway Twin Turbo. All you need is some good tuning, unrestricted intake track, no cats, adequate fuel pressure and about 14lbs of boost (with no leaks). You're starting to push the limits of pump gas at that level but should be safe with something like Sunoco Ultra 94.

Did somebody say flames?

 

[LT1pwrd'94]

There are two serious Callaway tuners on corvetteforum. Ultra Slow has about 490rwhp from his car with no major mods. there is another guy on there that is laying down 600rwhp. Both of those guys are really knowledgeable about the cars though.

I can vouch for Ultra's power levels. :s You know there is a LOT of of torque when you begin to slide sideways from a punch at 95 or so in 3rd gear. :J That was pretty damn :cool. I believe he has 315's in the rear. :gap

 

[JT ZR-Won]

Without spending too much money or swapping major parts you should be able to get 450+rwhp/600+rwtq reliably from a Callaway Twin Turbo. All you need is some good tuning, unrestricted intake track, no cats, adequate fuel pressure and about 14lbs of boost (with no leaks). You're starting to push the limits of pump gas at that level but should be safe with something like Sunoco Ultra 94.

Did somebody say flames?

That's interesting.....I get more excited about these cars every time I see one. I thought about possibly trading my ZR-1 for one at one point but I don't think I could ever part with it.

BTW, 90 Callaway, your car is wicked looking!

Jay

 

[90Callaway]

BTW, 90 Callaway, your car is wicked looking!

Jay

Thanks, Jay.

My feeling is the cars are significantly different enough that one can not replace the other. You either need to decide which you prefer or own both. I hope to pick up a ZR1 to add to the collection.

 

[Stan A]

Boost Levels

Hi Jay,

Having worked on few TT units and doing follow up performance testing ( I have to include David F.), I would limit the boost level to 14lbs or less on a modifed motor. There are many factors that effect boost but we have been able to produce 600hp/800lbs torque with just 12.7lbs boost and not change out the original Callaway operational scheme. Pushing the boost to high level will produce many different engine operation problems.

Have a good day,
Stan

 

[rkreigh]

seems like as long as you are willing to use unleaded race fuel and do some serious tuning, more power is available.

I think going to a modern aftermarket computer and larger injectors would help the fuel distribution instead of relying on the injectors in the "horn" for added fuel.

on my turbo buick (just for example), I run 18 psi on the street with no detonation, and over 24 at the track. some of the crazees run up to 28-30 on the leaded 116.

I'm currently running 72 lb injectors with still very good street manners through a corvette MAF.

when you see the big number that the turbo supra guys post, a radical callaway would be cool. but keep in mind the "production" contraints on the b2k and warrenty and you see why they kept the HP to reasonable levels.

once you start to modify the car, you really need to beef up the rods and bottom end and tune for zero detonation or you will quickly become aquainted with blown HG, hammered bearing, broken crank and pistons. I went through a couple turbo v6 motors and alot of knots on the head before I finally learned.

good news is that the v6 stock stuff used to be dirt cheap. not anymore.

trips to reeves to replace stuff isn't as affordable.

JT, why not just TT the ZR1 and have the best of both worlds!!!

interested???

 

[JT ZR-Won]

.....JT, why not just TT the ZR1 and have the best of both worlds!!!

interested???

Someday........soon hopefully!